Los Angeles ADU Permit Process, Step by Step
October 4, 2026
ADU Contractors in Los Angeles
- Precise Building and Restoration operates under California contractor license #1113493
- Written & Reviewed by: Tony Akopyan (Construction & Remodeling Specialist)
- Updated on:
Building an ADU in Los Angeles takes more than a good idea. It takes the right contractor, a smart plan, and a team that can handle design, permits, and construction from start to finish. At Precise Building and Restoration, we help homeowners create high-quality accessory dwelling units that add real function, long-term value, and flexibility to their property. Whether you are planning a garage conversion, detached backyard ADU, guest house, or two-story ADU, we provide a clear, professional path from concept to completion.
As experienced ADU contractors in Los Angeles, we focus on practical layouts, realistic budgeting, code-compliant planning, and high-quality workmanship. Our team understands how to turn underused space into a legal, comfortable, and attractive living unit for rental income, multigenerational living, guests, or a private home office. If you are looking for an ADU builder in Los Angeles who can guide the entire process with clarity and care, you are in the right place.
100+
ADU / garage conversion projects
14
Los Angeles neighborhoods served
35
years of experience in ADUs and garage conversions
Recent ADU Projects We’ve Built Across Los Angeles
As experienced ADU contractors in Los Angeles, we know that homeowners want more than promises. They want to see real work, real results, and real properties transformed into functional living spaces. Our ADU projects across Los Angeles include garage conversion ADUs, detached backyard ADUs, guest houses, rental units, home offices, and multigenerational living spaces designed around each homeowner’s goals, lot conditions, and budget.
Every ADU project is different. Some clients want to create a private space for parents or adult children. Others want to generate long-term rental income, add a stylish guest house, or turn an underused garage into a legal and comfortable dwelling unit. Our team handles the entire process, from planning and design to permits and construction, so clients can move forward with confidence.
Two-Story Modern ADU — Los Angeles, 2025
1,050 sq ft · two-story detached ADU · January 16 – September 25, 2025
The owners had a large backyard and wanted an ADU with the privacy and comfort of a standalone residence. We built a 1,050 sq ft two-story unit from the ground up, handling the architectural planning, structural engineering and a custom layout along the way. Expansive glazing fills the interior with daylight, and a modern kitchen, bathrooms and high-end finishes complete the space.
We handled the building permit, zoning and ADU compliance review, structural plan review, electrical, plumbing and mechanical permits, Title 24 energy compliance, utility clearances, and every inspection through final occupancy approval. The project ran nine months, from January to September 2025.
Garage Conversion ADU — Studio City, 2026
430 sq ft · garage conversion · November 2, 2025 – April 14, 2026
The owners of this Studio City home wanted rental income from a detached garage they rarely used. Converting it kept the new unit inside the existing footprint. We reworked the structure, added insulation, new windows and doors, and ran new plumbing and electrical for a bathroom and kitchenette. We redesigned the layout so all 430 sq ft works as living space.
We handled the building, electrical, plumbing and mechanical permits, Title 24 energy compliance, and every inspection through the Certificate of Occupancy. The project ran five months, from November 2025 to April 2026. The unit is now a private rental that adds value to the property.
Two-Bedroom ADU for Family in Sherman Oaks, 2026
640 sq ft · detached backyard ADU · Oct 14, 2025 – May 8, 2026
David C. and his family wanted a home on their Sherman Oaks lot for his in-laws. Tony spent more than an hour at the first consultation working out what the lot and budget could support, and from there we handled the design, permits, construction and inspections.
Early in the build we flagged a potential drainage issue, which saved the family thousands later on. His in-laws now live in the finished two-bedroom ADU.
We handled the building permit, zoning and ADU compliance review, structural plan review, electrical, plumbing and mechanical permits, Title 24 energy compliance, utility clearances, and every inspection through final occupancy approval.
Backyard ADU in West Los Angeles, 2026
400 sq ft · detached backyard ADU · March 3 – August 18, 2026
This West Los Angeles lot had little backyard room to spare, but the property still had strong ADU potential. We designed a compact 400 sq ft detached unit and built it from the ground up: new foundation and framing, a compact kitchen, a bathroom and built-in storage, so the small footprint works as a complete home. Modern finishes tie it together.
We managed the building, zoning, site plan, structural, electrical, plumbing and mechanical reviews, plus energy compliance, utility clearances and every inspection through final approval. Construction ran five months, from March to August 2026.
More completed projects
Types of ADUs We Build in Los Angeles
At Precise, we provide custom ADU construction in Los Angeles for a wide range of property types and homeowner goals. As full-service ADU builders in Los Angeles, we help clients choose the right unit type based on lot size, existing structures, intended use, budget, and long-term value.
Detached ADUs
We build detached ADUs for homeowners who want maximum privacy and flexibility. These standalone units are ideal for rental income, guest housing, home offices, or independent living spaces for family members.
Attached ADUs
We also build attached ADUs, which connect to the main residence while providing a separate living area. These can be an excellent option for homeowners who want to expand usable space while keeping the addition integrated with the existing home.
Garage Conversion ADUs
Our team specializes in garage conversion ADUs in Los Angeles, one of the most popular ways to create a new dwelling unit using space that already exists on the property. A properly designed garage conversion can become a highly functional and valuable addition without taking up more yard space.
Junior ADUs
For homeowners with limited square footage or specific layout needs, we also help plan junior ADUs, studio-style ADUs, guest houses, and custom-use spaces such as creative studios or work-from-home suites.
Every project is tailored to local code requirements, property conditions, and the way the space will actually be used.
Two-Story ADUs
Two-story ADUs are ideal for homeowners who want to maximize square footage without taking up too much yard space. They can provide a more spacious, home-like layout with better separation between living and sleeping areas, making them a smart option for family housing, guest use, or rental income.
Guest House ADUs
Guest house ADUs create a private, comfortable space for visitors, extended family, or future rental use. They are a practical way to add flexible living space to a Los Angeles property while also increasing functionality and long-term value.
Prefab/Modular ADUs
Prefab and modular ADUs can be a faster, more efficient way to add living space to a Los Angeles property. They are a practical option for homeowners who want a guest house, rental unit, home office, or flexible family space with a more streamlined construction process.
Which Type of ADU Investment Makes Sense for You?
An ADU can serve very different purposes depending on the homeowner’s priorities. For some, the main goal is long-term rental income. For others, it is creating a comfortable living space for parents, adult children, guests, or caregivers. Some homeowners want a private office, creative studio, or future downsizing option that adds flexibility to the property.
The right ADU strategy depends on how the space will be used, what level of privacy is needed, what the budget allows, and how important resale value is in the long term. A detached ADU in Los Angeles may offer stronger rental and privacy benefits, while a garage conversion ADU may offer a faster and more cost-efficient route to added living space.
Our role is not just to build. It is also to help clients think clearly about function, return, usability, and future value. The best ADU projects are the ones that align design and construction decisions with the homeowner’s real goals.
A well-planned ADU can add flexibility today and equity tomorrow, especially when it is designed with both lifestyle and investment value in mind.
Building an ADU for Rental Income in Los Angeles
A rental ADU earns its money back through rent, so we design it around what keeps a tenant happy and keeps your upkeep low. The biggest decisions happen at the plan stage, before a wall goes up.
What we build into rental ADUs:
- Separate entrance and address, so the tenant never walks through your yard or house
- Separate electric meter or submeter, so each household pays its own bill
- In-unit laundry, one of the features LA renters ask about first
- Hard-wearing finishes: luxury vinyl plank floors, quartz counters, semi-gloss paint in wet areas
- Sound control between the ADU and the main house on attached units
- Private outdoor space, even a small patio, screened from your own yard
For rent ranges and payback math, see how much rental income a Los Angeles ADU can generate.
Building an ADU for Aging Parents in Sherman Oaks and the Valley
An ADU for a parent has to work for the next 20 years, not only the first two. We plan it so they can stay independent as mobility changes, close enough that you can check in without moving them into your house.
What we build into ADUs for parents:
- Single level with a zero-step entry, and a paved path to the main house
- 36-inch doorways and hallways wide enough for a walker or wheelchair
- Curbless shower with a bench, and wood blocking in the walls so grab bars can go anywhere later
- Comfort-height toilet, lever handles and rocker light switches
- Non-slip flooring and night lighting from bed to bathroom
- Cooling sized for Valley summers, with extra insulation so the unit stays comfortable without high bills
If your parent would rather live inside the main house, a junior ADU (up to 500 sq ft within your existing home) is often faster and cheaper. We build both.
ADU Construction Costs in Los Angeles: Full 2026 Breakdown
Alright, let’s address the important question: “How much is this going to cost me?”
We get it. You’re not looking for vague “it depends” answers. You want numbers. Real numbers. So here’s the breakdown of what ADU contractors in Los Angeles are charging in 2026 for different project types.
Keep in mind: These are quality builds with premium materials from licensed, insured contractors who actually show up. If someone quotes you significantly less, ask yourself what corners they’re cutting (spoiler: probably all of them).
ADU Design and Build Los Angeles: Costs by Type
ADU Type | Size | Cost Range | What You Get | Best For |
Basic Garage Conversion | 400–600 sq ft | $80,000 – $150,000 | Converting existing detached garage into studio-style ADU. Studio/1 bed, 1 bath, kitchenette, standard finishes. | Budget-conscious builds, rental units, starter projects |
One-Story, One-Bedroom | 600–800 sq ft | $180,000 – $280,000 | Ground-up new construction. 1 bed, 1 bath, full kitchen, living area. Mid-range finishes, energy-efficient windows, proper insulation. | Aging parents, long-term rentals, young adult children |
One-Story, Two-Bedroom | 800–1,000 sq ft | $250,000 – $380,000 | Spacious layout. 2 beds, 1–2 baths, full kitchen, dedicated living/dining area. Quality finishes, upgraded appliances, smart home features. | Families, co-parenting situations, premium rental income |
Two-Story | 1,000–1,200 sq ft | $320,000 – $480,000 | Two levels. Typically 2–3 beds, 2 baths, full kitchen downstairs, bedrooms upstairs. Higher-end finishes, great storage, small deck/balcony. | Small lot owners going vertical, multi-generational living, maximizing rental value |
Luxury / Custom | 1,200+ sq ft | $500,000 – $750,000+ | High-end everything — designer fixtures, Wolf/Sub-Zero appliances, custom millwork, spa bathrooms, smart home automation, architectural details. | Homeowners wanting a structure rivaling their main house, luxury Airbnb, high-end guest accommodations |
Pre-Fab / Modular | Variable | $120,000 – $250,000 | Factory-built units delivered and installed. Faster timeline: 8–12 weeks vs. 6–9 months for traditional builds. | Those who prioritize speed over customization |
Additional Costs Beyond Construction (AKA The Stuff People Forget About):
Los Angeles ADU costs beyond base construction can include permits and city approvals, architectural and engineering plans, utility connections, site preparation and foundation work, landscaping and hardscaping, and furnishings or appliances for a rental. Precise Building and Restoration identifies these ADU project costs in itemized proposals so homeowners can plan the full investment.
City permits and fees:
- Cost Range: $5,000–$15,000 ($20,000–$25,000 for ADUs of 750 sq ft or more)
- What It Covers: Plan check fees, building permits, utility connection permits, impact fees (varies by LA neighborhood—some cities charge more than others)
- Timeline: 2-6 months
- Our Take: We handle this entire nightmare for you. You’re welcome.
Architectural & Engineering Plans
- Cost Range: $8,000 – $20,000
- What It Covers: Professional CAD designs, structural engineering, energy compliance calculations, site surveys
- Why It Matters: The city won’t even look at your permit application without these
- Our Bonus: Remember, your first three designs are FREE with us. That’s $8K-$20K you’re saving right there.
Utility Connections
- Cost Range: $5,000 – $15,000
- What It Covers: Connecting water, sewer, electrical, and gas lines from your main house to the ADU. Sometimes requires trenching, new panels, meter upgrades.
- The Surprise Factor: Old homes with outdated electrical panels? You might need a full panel upgrade for the main house too—add another $3K-$8K.
Site Preparation & Foundation
- Cost Range: $10,000 – $35,000
- What It Covers: Demolition (if needed), grading, excavation, concrete foundation, drainage systems
- Variable Costs: Sloped lots cost more. Awkward access? More expensive. Tree removal? Add $1K-$5K per tree.
Landscaping & Hardscaping
- Cost Range: $5,000 – $25,000
- What It Covers: Pathways to the ADU, replacing torn-up landscaping, new fencing, outdoor lighting, maybe a small patio
- Pro Tip: Don’t skimp here—a beautiful ADU with a muddy path and dead grass looks sad.
Furniture & Appliances (if renting/Airbnb)
- Cost Range: $8,000 – $25,000
- What It Covers: Beds, sofas, dining table, TV, cookware, linens—everything needed to make it livable
- Skip This If: You’re building for family members who have their own stuff
The Real-Deal Total Investment:
Let’s do the math on a typical one-story, two-bedroom ADU:
- Construction: $300,000
- Permits: $15,000
- Plans/Engineering: $12,000 (but FREE with us!)
- Utilities: $10,000
- Site Prep: $18,000
- Landscaping: $10,000
- Furnishing: $15,000 (if renting)
Grand Total: $380,000
Sounds like a lot? It is. But remember: you’re adding $150,000-$250,000 in property value, and if you rent it at $3,000/month, you’re looking at a 9.5% annual return on investment before tax benefits. Try getting that from a savings account in 2026 (current rates: a laughable 1.5-2%).
Why Cost Transparency Matters When Choosing ADU Contractors Los Angeles
Here’s the thing: the most trusted ADU contractors in Los Angeles don’t play games with pricing. We give you itemized proposals with everything spelled out. No “unforeseen circumstances” that magically add 30% to your bill halfway through.
When someone quotes you $150K for a two-bedroom ADU and it sounds too good to be true? It is. They’re either:
- Cutting corners on materials
- Not properly licensed/insured
- Planning to hit you with change orders for “extras” (that should’ve been included)
- All of the above
We’ve seen too many homeowners get burned by lowball bids that turn into financial nightmares. Our approach? Detailed, transparent, realistic pricing from day one. You know exactly what you’re investing and exactly what you’re getting.
Because building an ADU is already stressful enough without surprise bills making you question every life choice that led to this moment.
Which LA Contractor Gives the Best Value on an ADU?
ADU Construction Costs in Los Angeles: Full 2026 Breakdown
The best-value ADU contractor in Los Angeles is the one whose quote covers everything from plans to final inspection, so the number you sign is close to the number you pay. A low quote that leaves out engineering, permit fees or the sewer line is the most expensive kind. Below is what each part of a small backyard ADU typically costs in Los Angeles right now, so you can hold any quote up against it.
What a 400 sq ft Backyard ADU Costs in Los Angeles (October 2026)
Typical ranges for a detached, one-bedroom, one-bath ADU on a flat lot with normal access. Construction usually takes about five months after design and permitting, the same build time as our West Los Angeles ADU.
Line item | What it covers | Popular brand / type | Typical cost (USD) |
|---|---|---|---|
Design and architectural plans | Site plan, floor plan, elevations, up to 3 rounds of revisions | Licensed designer or architect | 8,000–14,000 (we offer 3 CAD designs for free) |
Structural engineering and Title 24 energy report | Calculations and energy compliance required for plan check | Licensed structural engineer; Title 24 energy consultant | 4,500–9,000 |
City permit and plan check fees | Building permit, plan check, trade permits, sewer and hydrant fees; no school or impact fees at this size | LADBS, LA Sanitation | 5,000–15,000 |
Site prep and foundation | Excavation, grading, concrete slab | Conventional or post-tensioned slab on grade | 18,000–32,000 |
Framing and roofing | Walls, roof structure, roofing material | Douglas fir framing; GAF Timberline shingles or standing-seam metal roof | 28,000–45,000 |
Windows and exterior doors | Dual-pane, low-E windows; entry and patio doors | Milgard Tuscany or Andersen 100 Series windows; Therma-Tru fiberglass entry door | 6,000–12,000 |
Plumbing | Supply and drain lines, water heater | PEX supply lines; Rheem ProTerra heat-pump water heater | 12,000–20,000 |
Electrical | Wiring, LED fixtures, 100A subpanel fed from the main house | Square D or Eaton panel | 10,000–18,000 |
HVAC | Heating and cooling | Ductless mini-split heat pump: Mitsubishi or Daikin | 6,500–12,500 |
Insulation and drywall | Walls and ceiling | Owens Corning or Rockwool batts; smooth or light-texture drywall | 8,000–14,000 |
Kitchen | Cabinets, counters, appliances | Shaker cabinets; Caesarstone or MSI quartz; GE or Samsung appliances with induction range | 12,000–25,000 |
Bathroom | Tile, shower, vanity, fixtures | Porcelain tile; Kohler or Delta fixtures | 10,000–18,000 |
Flooring, paint and trim | Whole unit | Shaw or COREtec luxury vinyl plank; Dunn-Edwards paint | 7,000–13,000 |
Utility connections | Sewer, water and electrical tie-ins to the main house | Sewer lateral tie-in; separate meter optional | 8,000–20,000 |
Final inspections and cleanup | Through certificate of occupancy | Includes the 150 Certificate of Occupancy fee | 1,500–4,000 |
Total | About 360–680 per sq ft | 144,500–271,500 |
Not included: furniture, landscaping and hardscape, a main panel upgrade (about 5,500–8,500 when the house needs 200A service), and the 10% contingency we recommend on top.
Four checks for comparing ADU quotes
- Plans and permits. Is design, engineering and city fees in the price, or only construction?
- Utility work. Are the sewer, water and electrical connections priced, or left as “by others”?
- Allowances. How much is set aside for finishes like tile, fixtures and appliances? A small allowance makes a quote look cheap and comes back as a change order.
- Change orders. How are changes priced, and who approves them before work starts?
We walk through what a complete quote should list in What’s included in a turnkey ADU construction quote. If you already have bids that are far apart, this guide to comparing remodeling bids explains where the gaps usually hide.
ADU Garage Conversions in Los Angeles: The Most Affordable ADU You Can Build (And the Fastest)
Let’s be honest — most garages in LA aren’t actually being used for cars. They’re storage units with a door. A place where old furniture goes to die and gym equipment collects dust. Sound familiar?
Here’s the good news: that underused space sitting in your backyard? It’s secretly one of the smartest investments you can make.
A garage conversion ADU takes what you already have and turns it into something genuinely useful — a rental unit, a guest suite, a space for mom and dad, or a home office that doesn’t double as your dining room table. And because the structure is already there, you’re skipping a huge chunk of the construction costs that come with building from scratch.
As a garage conversion contractor in Los Angeles, at Precise Building and Restoration, Tony and the team have converted dozens of LA garages into beautiful, fully permitted ADUs. We’re talking proper kitchens, custom kitchen cabinets, real bathrooms, good insulation, and finishes that don’t look like an afterthought. The kind of space someone actually wants to live in.
Here’s why garage conversions are so popular in LA right now:
- They’re the most affordable ADU option — typically $80,000 to $150,000
- Faster permits and faster builds than new construction
- No additional footprint on your lot
- Immediate rental income potential in one of the country’s tightest rental markets
- Adds serious value to your property
The process doesn’t have to be complicated either. Tony walks every homeowner through the whole thing — permits, design, construction, inspections — so you’re never left guessing what happens next or why there’s a crew showing up at 7am on a Tuesday.
If you’ve got a garage and you’ve been sitting on the idea of an ADU, this is your sign. Let’s turn that dusty storage space into something that actually works for you.
ADU Permits in Los Angeles — Yes, It's a Process. No, It Doesn't Have to Be a Nightmare.
Let’s get the elephant out of the room: permits in LA have a reputation. And honestly? Not entirely undeserved. The city isn’t exactly known for its breezy bureaucracy. But here’s the thing — the permit process has actually gotten a lot better in recent years, especially for ADUs. California basically forced LA’s hand with statewide pro-ADU legislation, and the city had to streamline things whether it wanted to or not.
So yes, there’s paperwork. Yes, there are inspections. But it’s absolutely manageable — especially when you’ve done it dozens of times before.
How the LA ADU Permit Process Actually Works
Here’s the basic journey from “I want to build an ADU” to “here are your keys”:
1. Pre-Application Research Before anything gets submitted, we figure out what your lot can actually support. Zoning, setbacks, size limits, utility connections — all of that gets sorted out upfront so there are no surprises later.
2. Plan Preparation Architectural plans get drawn up showing exactly what’s being built. These need to meet LA’s building code, Title 24 energy requirements, and any HOA or neighborhood-specific rules. This is where a lot of DIYers hit their first wall.
3. Plan Check Submission Plans get submitted to the LA Department of Building and Safety (LADBS). This can be done online through their portal, which — genuinely — has improved a lot. First review typically flags corrections. You respond, resubmit, and eventually get approved.
4. Permit Issuance Once plans are approved, permits get issued and construction can begin. You’ll typically have separate permits for building, electrical, plumbing, and mechanical.
5. Inspections During Construction As the build progresses, city inspectors come out at key milestones — foundation, framing, rough electrical and plumbing, insulation, and final inspection. Every box has to be checked.
6. Certificate of Occupancy The finish line. Once the final inspection passes, you get your Certificate of Occupancy and your ADU is officially legal, livable, and ready to rent or move into.
ADU Permit Fees in Los Angeles: What You Pay the City (2026)
For a standard ADU, the fees you pay the city for plan check and the building permit typically run $5,000 to $15,000. Two more charges depend on the ADU’s size: school fees apply once the unit is over 500 sq ft, and impact fees apply at 750 sq ft and up. On an ADU of 750 sq ft or more, those can bring your total city fees to about $20,000–$25,000.
These are city fees only. Design, engineering and the Title 24 energy report are separate costs, listed in our cost breakdown above.
What you pay the city, line by line:
- Building permit fee: $2,000–$5,000. LADBS sets it from your project’s construction value, using the city’s fee table.
- Plan check fee: about 90% of the building permit fee, or roughly $1,800–$4,500. This pays for the city’s review of your plans.
- Trade permits: separate electrical, plumbing and mechanical permits for the work inside the unit.
- School fees: $0 for an ADU of 500 sq ft or less. Above that, the Los Angeles Unified School District charges $5.38 per sq ft. A 650 sq ft ADU, for example, pays about $3,497. (*LAUSD has charged $5.38 per sq ft since August 11, 2026)
- Impact fees: $0 for an ADU under 750 sq ft, under California law. Larger ADUs pay impact fees in proportion to the size of the main house.
- Smaller city charges: a sewer connection charge from LA Sanitation, a fire hydrant fee (0.22% of the construction value on projects of $50,000 or more), a plan maintenance fee (2% of the building permit fee, capped at $300) and $150 for the Certificate of Occupancy.
City fee schedules are updated every July, so we confirm current amounts with LADBS before we price your project.
How Long Does It Take?
Here’s the honest answer: it depends. But here are realistic timelines to plan around:
- Plan preparation: 4 – 8 weeks
- City plan check & corrections: 8 – 16 weeks (this is where most of the waiting happens)
- Permit issuance after approval: 1 – 2 weeks
- Construction: 4 – 9 months depending on ADU type
- Final inspection & Certificate of Occupancy: 2 – 4 weeks
Total timeline from start to move-in: roughly 9 – 18 months for a ground-up build. Garage conversions can move faster — sometimes under a year if things go smoothly.
Common ADU Permit Challenges in Los Angeles — and How We Handle Them
One of the biggest reasons homeowners delay building an ADU is uncertainty about permits, code requirements, and city approvals. As experienced ADU contractors Los Angeles, we understand that permit issues can affect budget, timing, design, and even whether a project is feasible in the first place.
Los Angeles ADU projects can face challenges related to setbacks, lot configuration, garage conversions, utility access, structural requirements, and plan corrections during review. Hillside properties, irregular lots, and older homes can add another layer of complexity, especially when the new unit must work around existing site conditions and infrastructure.
That is why our process includes careful planning from the beginning. We help identify potential issues early, shape the project around local requirements, and guide the permit process with a practical understanding of what tends to slow projects down. Instead of treating permits as an afterthought, we build them into the strategy from day one.
For homeowners, that means fewer surprises and a clearer path forward. A well-planned ADU project is not just about design or construction. It is also about navigating Los Angeles regulations intelligently and efficiently.
Taking Over an Abandoned ADU Project in Los Angeles
If your contractor walked off your ADU, we can assess it and finish it. In most cases the job can restart on the existing permit, as long as that permit is still active. The first step is finding out exactly where your project stands.
What we check before we quote
- Permit status. We look up your permit with LADBS: is it active, and when was the last inspection passed? A permit can expire when work stops for 180 days, so this check comes first.
- Inspections already passed. We pull the inspection record. Work the city signed off stays signed off, unless it has since been damaged or changed.
- What was built vs. the approved plans. We walk the site with the stamped plans and note every difference. Differences may need a plan revision before work continues.
- Hidden work. Anything covered up without an inspection, such as plumbing or wiring behind drywall, has to be opened for the inspector.
- Materials and money. We list what’s on site, what was paid for and what was delivered, so you know the real cost to finish.
- Becoming contractor of record. Once you hire us, we file the change of contractor with LADBS so the permit and inspections continue under our license, CSLB #1113493.
What usually has to be reopened or redone
- Work that was covered before it was inspected
- Framing or sheathing left exposed to rain or sun for months
- Anything built differently from the approved plans
- Rough plumbing or electrical that doesn’t meet code
Protecting yourself after a contractor leaves
Every licensed California contractor carries a license bond. You can find the bond company by looking up the old contractor on the CSLB website; our guide on how to verify a California contractor license shows where. For getting money back or dealing with liens, talk to a construction attorney. We’ll give them the site report, photos and cost-to-finish they need.
Send us your permit number and a few photos, and we’ll tell you where your project stands. Call (310) 606-2222.
ADU Design, Permits and Construction Under One Roof
Here’s where being ADU contractors Los Angeles homeowners actually want to work with really shines.
Most construction companies are like ordering à la carte at a restaurant where nothing comes together and you end up with seven random appetizers and no entrée. You hire one team for permits, another for design, another for engineering, another for the actual build, and suddenly you’re conducting an orchestra of chaos where nobody’s playing the same song.
Not with Precise Building and Restoration.
We handle everything in-house from ground zero to completion. Precise Building and Restoration handles your ADU from the first site visit to the certificate of occupancy. You sign one contract and have one point of contact, Tony Akopyan, for the whole job.
What We Handle (So You Don't Lose Your Mind):
ADU Permits & City Approvals
Los Angeles has a complex permitting and approval process for ADU construction. We help property owners navigate zoning requirements, plan review, permits, and coordination with local agencies from the early planning stages through approval. California has expanded ADU opportunities through State ADU Law, while SB 9 provides separate options for qualifying duplex developments and lot splits. Although these laws can make additional housing easier to develop, the permitting process still requires careful documentation, code compliance, and coordination with the appropriate city departments. The good thing is they are our specialty, and we do that perfectly.
Engineering
Structural integrity isn't something you want to cheap out on. (Hot take, we know.) Our licensed engineers ensure your luxury guest house won't become a cautionary tale during the next earthquake. California gets about 10,000 earthquakes a year—most tiny, but still. We build like we're expecting "The Big One."
Professional CAD Designs
Created by actual human experts with degrees and everything. Not AI. Not some template from 2003. Real architects who understand that your vision for a backyard cottage should look like so
The Actual Construction
With premium materials that'll last decades, not just until your first inspection.
One team. One point of contact. One company that you can actually hold accountable when your mother-in-law moves into the ADU and has opinions about the kitchen backsplash.
ADU Construction Across Los Angeles Neighborhoods
Our most recent ADUs include a garage conversion in Studio City, a backyard ADU in West Los Angeles and a two-bedroom ADU in Sherman Oaks. Each card above lists the size, timeline and what made that lot different.
Building an ADU in Los Angeles is never one-size-fits-all. Different neighborhoods come with different lot sizes, site conditions, access constraints, and homeowner priorities. As local ADU builders in Los Angeles, we understand how neighborhood context can shape the best design and construction approach.
In some areas, homeowners are focused on converting detached garages into rental units or guest spaces. In others, the priority may be building a detached ADU in the backyard for family housing, a home office, or long-term flexibility. Larger lots may allow for more expansive detached units, while tighter urban properties often require smarter layout planning and more strategic use of existing structures.
Our experience with ADU construction in Los Angeles helps us tailor each project to the realities of the property and the expectations of the homeowner. Whether the goal is a rental-focused ADU, multigenerational living solution, or private creative studio, we approach each neighborhood and each lot with fresh eyes and practical construction expertise.
A local project should feel local. That is why neighborhood-based planning and real understanding of Los Angeles housing patterns matter when choosing an ADU contractor.
Why Choose Precise Building as Your ADU Contractor in Los Angeles
The construction industry has a bit of a reputation problem. We’ve all heard the horror stories. The contractor who takes your deposit and disappears like a magician. The “three-month project” that somehow stretches into year two. The surprise costs that pop up like those annoying ads you can’t skip.
Here’s why we’re different, and why we’re considered the most trusted ADU contractors in Los Angeles:
35+ Years of Solid Experience with ADU
As a trusted home builder in Los Angeles, we’ve been in the industry for over three and a half decades. Family-owned businesses don’t survive that long by cutting corners or ghosting clients. We survive because word-of-mouth in Southern California’s tight-knit luxury home market is everything. One unhappy client with expensive taste and a robust social network can tank you. One delighted client? They’ll sing your praises from their rooftop deck overlooking the Hollywood Hills.
We Show Up Every Time
Revolutionary concept, we know. In 2026, choosing a reliable contractor matters more than ever as builders continue to face elevated construction costs and broader industry uncertainty, according to the National Association of Home Builders (source: nahb.org).
We communicate. We answer calls, text messages, and emails. We deliver on timelines.
Your home is personal. It’s where your kids grew up, where you host Thanksgiving, where you built memories. We get that. Which is why we treat every square inch like it’s going to be featured in Architectural Digest—because honestly, some of our work has been.
The Luxury Touch (Because Your Taste Isn't Basic and Neither Are We)
Our projects reflect that. We’re talking:
- Flawless finishes that would make an interior designer weep tears of joy
- Cutting-edge smart home technology integration
- Custom details that show meticulous attention to every decision
- Structural safety that exceeds code requirements (because “good enough” isn’t in our vocabulary)
Whether it’s a modern farmhouse backyard cottage, a sleek contemporary rental unit, or a traditional Craftsman-style guest house, we build it like it’s going into a luxury home portfolio. Because it is.
Real ADU Owners. Real Results. Real Reviews.
Choosing an ADU contractor is a major decision, and homeowners naturally want reassurance that the team they hire can deliver both quality work and a positive experience. That is especially true for projects involving permits, design coordination, structural changes, and significant investment.
Our ADU clients value clear communication, honest guidance, and a process that feels organized instead of overwhelming. Many homeowners come to us because they want a builder who can handle more than basic construction. They want a team that understands ADU planning, garage conversions, detached ADUs, local permitting, and the bigger picture of adding value to the property.
★★★★★
Best contractor experience I've ever had, period
Building an ADU felt overwhelming until we met Tony. He sat with us for over an hour during the initial consultation — no rush, no sales pressure — just honest advice about what made sense for our lot and budget. Precise Building and Restoration handled everything: design, permits, construction, inspections. Tony kept us updated every step of the way and flagged a potential drainage issue early that saved us thousands down the line. The finished two-bedroom ADU is stunning. My in-laws moved in last month and they're obsessed. Tony treated our project like it was his own home. That's rare, and that's why I'll recommend him to everyone I know.
★★★★★
Finally have the ADU we've been dreaming about — and Tony made it happen
After getting quotes from four different contractors, we went with Precise Building and Restoration based on a neighbor's recommendation, and I'm so glad we did. Tony was upfront about costs from day one — no surprise invoices, no scope creep, no excuses. He walked us through every phase of the build, answered my (many) texts quickly, and genuinely cared about the finished product. Our 750 sq ft ADU came out better than we imagined. It's already rented out and cash-flowing. If you're on the fence, just call Tony.
★★★★★
Tony and his crew are the real deal
I've hired contractors before and always ended up stressed. With Tony at Precise Building and Restoration, it was a completely different experience. He showed up when he said he would, his crew was clean and respectful, and the craftsmanship on our one-bedroom ADU is exceptional. The tile work, the cabinetry, the finishes — everything looks high-end without the ridiculous markup. We came in on budget and just two weeks past our original timeline (permitting delays, not their fault). Our ADU appraised $40K above what we spent building it. Couldn't recommend more highly.
How to Check Out Any ADU Contractor (Including Us)
Before you hire anyone to build an ADU, check three things yourself: the license, the insurance and past clients. It takes about ten minutes, and here is everything you need to check us.
- License: Precise Building and Restoration, CSLB #1113493. Look it up on the CSLB license check to see that it’s active, its classification, our bond and our workers’ comp status.
- Bond: 25,000-dollar contractor’s license bond with Nationwide Mutual Insurance Company, effective July 21, 2026.
- Insurance: workers’ compensation through National Liability & Fire Insurance Company, active through September 3, 2027, plus general liability coverage. We’ll send certificates naming you before work starts.
- References: we’ll put you in touch with 2–3 Los Angeles ADU clients from the last two years. You can also read our Google reviews above and our BBB profile.
- Office: 500 S Sepulveda Blvd, Suite 408, Los Angeles, CA 90049 · (310) 606-2222
Five questions to ask every ADU builder you compare
Question | Why it matters |
How many ADUs have you finished in LA in the last two years? | Permit and inspection experience with LADBS is specific |
Who is on site every day, and who is my contact? | Tells you whether the owner is involved or hands you off |
Do plans, engineering and city fees sit inside your price? | The most common reason quotes look far apart |
What is the payment schedule? | California limits a home improvement down payment to 10% or 1,000 dollars, whichever is less |
What warranty do you give, in writing? | Verbal warranties are hard to enforce |
Our guides on verifying a California contractor license, comparing bids with very different prices and how a contractor’s payment schedule should work go deeper on each check.
Before-and-After ADU Transformations
One of the most powerful ways to understand the value of an ADU is to see the transformation itself. A dark, underused garage can become a bright and modern living unit. An empty backyard can become a fully functional detached ADU. A neglected structure can become a legal, beautiful, income-producing space.
As a full-service ADU contractor in Los Angeles, we believe visual proof matters. Before-and-after ADU examples help homeowners see what is possible, not just in theory, but in real construction terms. They show how design, planning, and craftsmanship come together to create a finished space that feels intentional, comfortable, and valuable.
Detached Rental ADU — Culver City Area
Before
After
Property Type: Residential lot with open rear yard space
ADU Size: 800 sq. ft.
Project Scope: Detached two-story ADU construction, site preparation, concrete work, framing, roofing, kitchen and bath installation, utility coordination, flooring, and final finishes
Timeline: Approximately 9 months
Final Outcome: The goal of this project was to create a detached ADU for stable long-term rental income. We developed a spacious two-story unit with a clean, modern design and strong privacy separation from the main home. The completed ADU gave the homeowners a valuable income-producing asset and expanded the functionality of the property.
Is Your Los Angeles Property a Good Candidate for an ADU?
Many homeowners are interested in building an ADU but are not sure whether their property is a good fit. That is a common and important question. The answer depends on the lot, the existing structures, the intended use of the unit, and the practical realities of design and permitting.
Properties with detached garages, underused backyard space, side access, or room for a standalone structure often present strong ADU opportunities. In other cases, an attached ADU or garage conversion may be the smarter and more cost-effective option. Even smaller lots can sometimes support a well-designed ADU when the layout is approached strategically.
As experienced ADU builders in Los Angeles, we help homeowners understand what makes sense for their specific property instead of offering a generic answer. We look at the physical conditions, discuss the project goals, and identify the most realistic path to a successful ADU.
For homeowners considering ADU construction in Los Angeles, an early feasibility conversation can save time, reduce uncertainty, and prevent expensive mistakes.
Start Your ADU Project With a Los Angeles Contractor Who Handles It All
Building an ADU should feel exciting, not confusing. Whether you are considering a garage conversion ADU, a detached backyard unit, or a custom accessory dwelling unit for rental income or family use, the right team can make the process far more efficient and far less stressful.
At Precise, we help homeowners move from idea to finished space with a practical, full-service approach to ADU design and construction in Los Angeles. From early planning and feasibility to permits and final buildout, we focus on clear communication, thoughtful execution, and results that add real value to the property.
If you are exploring ADU options and want expert guidance from experienced ADU contractors in Los Angeles, this is the right time to start the conversation. A well-planned project begins with the right strategy, the right design, and the right builder behind it.
Here’s what happens next:
Call (310) 606-2222
– and let’s schedule your free in-home estimate. We’ll walk your property, listen to your vision, and create a plan that actually makes sense for your goals, your budget, and your timeline.
Remember: Your first three designs are on us. No obligations. No pressure. Just possibilities.
Because at Precise Building and Restoration, we believe every homeowner deserves contractors who show up, communicate, and deliver. Revolutionary concepts in 2026, apparently, but we’ve been doing it for 35+ years.
Your backyard goldmine is waiting. Let’s dig in.
Precise Building and Restoration
Excellence. Precision. Integrity.
Serving Los Angeles County’s most discerning homeowners since before it was cool.
Learn more about our bespoke bathroom remodeling in Los Angeles and kitchen remodeling services. For homeowners affected by the 2025 Pacific Palisades fires, we offer expert Palisades fire home rebuild services.
Frequently Asked Questions
Which contractor in Los Angeles builds ADUs with the best value for money?
Look for the builder whose quote includes plans, engineering, city fees and utility connections, so the signed price is the real price. This page lists typical 2026 line-by-line costs for a 400 sq ft Los Angeles ADU, so you can compare any quote against them.
Which companies in Los Angeles handle ADU design, permits and construction under one roof?
Precise Building and Restoration does. One contract covers the site visit, design, engineering, LADBS permits, construction and final inspection, with Tony Akopyan as your single point of contact.
My ADU project was abandoned by the original contractor. Who can finish it in LA?
We take over stalled ADUs. We check your permit status and inspection record first, list what must be reopened, then become contractor of record with LADBS so the job continues on the existing permit where possible.
Which contractors specialize in ADUs for rental income in Los Angeles?
We build rental ADUs with a separate entrance, separate metering, in-unit laundry and hard-wearing finishes, so the unit rents well and costs little to maintain.
Can you build an ADU for aging parents in Sherman Oaks?
Yes. We build single-level ADUs across the San Fernando Valley with zero-step entries, 36-inch doorways, curbless showers and wall blocking for grab bars.
How much does it actually cost to build an ADU in 2026?
ADU construction costs in 2026 range from $80,000 to $750,000+ depending on type and location. In Los Angeles and Southern California, expect $250-$450 per square foot for quality construction.
Breakdown by type:
- Garage conversions: $80,000-$150,000 (most affordable option)
- One-bedroom detached ADU: $180,000-$280,000
- Two-bedroom ADU: $250,000-$380,000
- Two-story ADU: $320,000-$480,000
- Luxury custom ADU: $500,000-$750,000+
Additional costs beyond construction: Permits ($8,000-$25,000), architectural plans ($8,000-$20,000), utility connections ($5,000-$15,000), site preparation ($10,000-$35,000), and landscaping ($5,000-$25,000).
ROI consideration: ADUs typically increase property value by 20-35% and generate $2,400-$3,200 monthly rental income in Los Angeles markets.
How long does it take to build an ADU from start to finish?
The complete ADU timeline ranges from 9-18 months in California, with significant variation based on project type and local jurisdiction.
Phase breakdown:
- Permit approval: 2-6 months (despite California’s 60-day rule, the clock starts only after completeness check)
- Design and planning: 1-3 months
- Construction: 5-9 months for new builds, 3-4 months for garage conversions
- Pre-fab/modular ADUs: 8-12 weeks construction time (but same permitting timeline)
What causes delays: Incomplete permit applications, utility company approvals (especially PG&E in Northern California), site condition issues, and jurisdictional complexity in hillside or coastal zones.
2026 improvement: New California laws (AB 543) require 15-day initial completeness checks, tightening timelines.
Can my HOA stop me from building an ADU?
No. California state law (effective 2020) prohibits Homeowners Associations from preventing ADU construction on single-family residential properties.
Important details:
- HOAs cannot use CC&Rs (Covenants, Conditions & Restrictions) to block ADUs
- HOAs may still have some design review authority for aesthetic standards
- This protection applies statewide, overriding local HOA rules
- Multifamily properties have different regulations under SB 1211
What HOAs can do: Request adherence to architectural guidelines for exterior appearance, but cannot deny the project entirely.
Recommendation: Notify your HOA early and work collaboratively on design elements to avoid friction.
Do I need to live on the property if I build an ADU?
No owner-occupancy requirement currently exists in California for ADUs. The state suspended this requirement, and as of 2026, you can rent both your primary residence and ADU without living on the property.
Exception: Junior ADUs (JADUs) still require owner occupancy in either the main house or the JADU unit itself.
Rental flexibility: You can:
- Rent the ADU while living in the main house
- Rent the main house while living in the ADU
- Rent both structures without occupying either
- Use the property purely for investment purposes
Future consideration: This waiver was extended multiple times; check current regulations if building after 2027.
Will building an ADU increase my property taxes?
Yes, but only on the added value of the ADU itself, not your entire property. In California, Proposition 13 protects against full property reassessment.
How it works:
- Your property tax increases only on the supplemental value added by the ADU
- The main house assessed value remains unchanged
- Average property tax increase: $1,500-$4,000 annually depending on ADU value
- This is offset by rental income potential ($28,800-$38,400 annually)
Example calculation: A $300,000 ADU adds approximately $3,000/year in property taxes (at 1% base rate), while generating $36,000/year in rental income.
Additional benefit: The increased property value (20-35% boost) benefits you at resale.
Can I rent my ADU on Airbnb or only for long-term rentals?
It depends on your city’s regulations. Long-term rentals (30+ days) are permitted statewide in California, but short-term rental rules vary by jurisdiction.
Long-term rentals (30+ days):
- Permitted in all California cities
- Easiest to manage with stable income
- One-year leases most common
Short-term rentals (under 30 days):
- Some cities prohibit ADUs from short-term rental use
- Cities like Los Angeles, San Francisco, and San Diego have specific restrictions
- Some jurisdictions require special permits or registration
- Revenue potential: $150-$300/night in desirable neighborhoods (50% occupancy = $2,250-$4,500/month)
Before deciding: Check your specific city’s short-term rental ordinances and any HOA restrictions.
Do I need separate utilities for my ADU?
Separate utility meters are not required in California, but are optional based on homeowner preference.
What the law says:
- ADUs can share existing utility connections with the main house
- No requirement for separate gas, electric, or water meters
- Most homeowners keep shared utilities for simplicity and cost savings
When separate meters make sense:
- Renting to tenants and want them to pay utilities directly
- Local utility company requires upgrade anyway
- Investment property where you want clear expense separation
Alternative approach: Use sub-metering devices ($100-$300) to track ADU utility usage and bill tenants accordingly, or include utilities in rent price.
Cost consideration: Separate meter installation adds $5,000-$15,000 to project budget.
What's the difference between an ADU and a JADU?
A Junior ADU (JADU) is a smaller, more restricted type of accessory unit created within the existing primary residence, while an ADU can be detached, attached, or converted from existing structures.
JADU specifications:
- Maximum 500 square feet
- Must be located inside existing primary residence
- Can be created from bedroom or other interior space
- Requires owner occupancy (in either main house or JADU)
- Can have efficiency/kitchenette instead of full kitchen
- Often shares bathroom with main house
ADU specifications:
- Up to 1,200 square feet (detached) or 50% of main house size (attached)
- Can be fully detached, attached, or garage conversion
- Requires full kitchen, bathroom, sleeping area
- No owner-occupancy requirement
- More expensive but more versatile
Key advantage of JADUs: Lower cost ($25,000-$75,000), faster permitting, minimal impact fees.
Will I need to upgrade my electrical panel for an ADU?
Most likely yes. Electrical panel upgrades are one of the most common “surprise” costs in ADU projects, affecting approximately 60-70% of builds.
Common scenario:
- Older homes typically have 100-amp electrical service
- ADUs require upgrading to 200-amp service to safely handle additional load
- Cost: $3,000-$8,000 for panel upgrade
Signs you’ll need an upgrade:
- Your home has a 100-amp or smaller panel
- Built before 1980
- Planning electric heating, cooling, or appliances in ADU
- Existing panel is at capacity
Who pays: Homeowner responsibility, but some utility companies offer rebates for electrical upgrades.
Can I sell my ADU separately from my main house?
In some California cities, yes. AB 1033 (effective January 2024) allows ADUs to be sold as separate condominiums, but only if your local jurisdiction has adopted enabling ordinances.
Cities that currently allow ADU condo sales:
- San Jose
- Santa Monica
- San Diego
- Several others (check your specific city)
How it works:
- Property must be “condo-mapped” to create separate legal parcels
- Each unit gets its own deed and can be sold independently
- Creates homeownership opportunities in expensive markets
- Useful for estate planning or accessing equity
Limitations:
- Not available in all jurisdictions (most cities haven’t adopted ordinances yet)
- Legal and surveying costs to subdivide property
- HOA implications if applicable
- Title and mortgage considerations
Alternative: If selling separately isn’t allowed, the ADU increases your overall property value significantly when selling the entire property.
Note: This is rapidly evolving legislation; more cities are expected to adopt enabling ordinances through 2026-2027.
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