Best ADU Builders in Los Angeles (2026): Vetted & Licensed

Every builder in this directory is CSLB license-verified, bonded, and insured before they ever reach your shortlist. We pre-screen LA's top ADU contractors so you don't have to gamble with your backyard — or your savings.

We match you with vetted, California-licensed ADU builders in your area — no guesswork, no cold-calling contractors.

Choosing an ADU builder in LA shouldn't feel like a coin flip.

Los Angeles is the epicenter of California's ADU boom — and a documented hotspot for contractor scams. We exist to take that risk off the table.

Los Angeles County now permits more accessory dwelling units than anywhere in the state. LA city went from 80 ADU permits in 2016 to over 7,160 in 2022, and roughly one in three newly permitted homes in LA is now an ADU (CA YIMBY, 2024). With that gold rush came a wave of bad actors: in one widely reported case, a Southern California ADU contractor took deposits from 450+ homeowners before going bankrupt (NBC Bay Area investigation).

That's the problem this directory was built to solve. 1-800-ADU-Pros is a referral and pre-qualification service — not a contractor. We don't hold a construction license and we don't build anything ourselves. What we do is vet the builders so you only ever talk to pros who are actively licensed, bonded, and insured, with their CSLB number on file and shown on their profile. Construction is performed by independent California-licensed contractors.

The order of operations matters too. Most homeowners call a contractor before they confirm their property can even support an ADU — which is backwards. Before you talk to any builder, find out for free whether your lot qualifies, then meet a pre-screened pro who knows your zone cold.

How we vet every builder in this directory.

No builder appears here until they clear all four checks. We re-verify license and bond status on an ongoing basis.

1

Active CSLB License

We confirm a current, active California State License Board number in the right classification (typically Class B General Building) — and re-check that it stays active, not lapsed or suspended.

2

Bonded & Insured

Every builder carries the required $25,000 contractor's bond, plus general liability and active workers' compensation coverage for their crews.

3

Clean Track Record

We review CSLB complaint and disciplinary history and look for verifiable, recently completed LA projects — addresses you can confirm on the LADBS permit portal under their name.

4

Local LADBS Expertise

We screen for real Los Angeles permitting fluency — ZIMAS, ePlanLA, LADBS Standard Plans, and your zone (R1 / RD2 / R3). A pro should answer "what zone is my lot?" in seconds.

Top vetted ADU builders in Los Angeles.

A snapshot of pre-screened, CSLB-licensed LA ADU contractors. We match you to the right fit for your zone, lot, and budget — get matched below.

Each builder below is independently CSLB license-verified from public records. Builder logos/photos are pending asset delivery; CSLB number, classification, service area, and ratings reflect verified public-record and published-source data. 1-800-ADU-Pros is a referral service — these are independent licensed builders we list, not us.

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Goldenline Construction

Goldenline Construction

★★★★★ 4.9

CSLB #989378 · Class B · Active

Serves: Woodland Hills, Encino, Sherman Oaks, Van Nuys, Granada Hills & the West SFV

Detached ADUsDesign-Build$25k Bonded & Insured

View vetted profile

](/builder/goldenline-construction)[

Dwell Homes Los Angeles

Dwell Homes Los Angeles

★★★★★ 4.9

CSLB #1030158 · Class B · Active

Serves: Valley Village & the San Fernando Valley, greater Los Angeles

Detached ADUsGarage Conversions$25k Bonded & Insured

View vetted profile

](/builder/dwell-homes-los-angeles)[

LA CCS

LA CCS

★★★★★ 5.0

CSLB #1047699 · Class B · Active

Serves: San Fernando Valley, Glendale, Burbank, Pasadena, San Gabriel Valley & LA County

ADUs & AdditionsRemodelsBonded & Insured

View vetted profile

](/builder/la-ccs)[

Acton ADU

Acton ADU

★★★★★ 4.9

CSLB #638333 · Class B · Active

Serves: Los Angeles & statewide California (California-based, serving the LA market)

Detached ADUsDesign-BuildBonded & Insured

View vetted profile

](/builder/acton-adu)

Before you spend a dollar, find out if it's even viable.

We don't hand you a phone book. We qualify your property first, then connect you with the right vetted pro — at no cost and no commitment.

Step 1 · Free, Remote

See if your property qualifies

Enter your address and we'll review zoning, lot size, setbacks, and overlays — then tell you straight whether your lot can likely support an ADU. No cost, no commitment, no contractor in your inbox yet.

Step 2 · Free, On-Site

Book your free feasibility assessment

If it looks viable, we send a vetted, CSLB-licensed pro to check your electrical panel, water and sewer, access, and layout in person — and give you an honest read on what's possible.

How to vet an ADU builder yourself.

We do this for every listing in our vetted builder directory — but you should know the checks too. See exactly how we vet every builder, then protect yourself in California with the steps below.

1. Run the free CSLB license lookup

California requires a contractor's license number on every ad and contract (Business & Professions Code §7030.5). Take any builder's number to the CSLB "Check a License" tool and confirm four things:

• Status is ACTIVE — not expired, suspended, or revoked.
• Classification is right — typically Class B (General Building) for an ADU.
• A $25,000 contractor's bond is on file and current.
• Workers' compensation is active if they have employees — otherwise an injury on your property can become your liability.

2. Know the $1,000 deposit cap — it's the law

This is the single biggest protection against abandonment scams. In California, a contractor cannot legally collect a down payment of more than $1,000 or 10% of the contract price, whichever is less (Business & Professions Code §7159.5). On any ADU — which runs well over $10,000 — that means the legal cap is effectively $1,000 up front (CSLB).

Scammers disguise oversized deposits as "material reservation," "lumber-lock," or "pre-construction onboarding" fees. They're often repackaged illegal deposits. If a builder demands tens of thousands before any work begins, walk away.

3. Watch for these red flags

• A large up-front deposit beyond the $1,000 cap, or a front-loaded payment schedule.
• No license number on their ads or contract, or a number that won't verify on CSLB.
• A "permit in 30 days" promise on a custom build. The 60-day state review is statutory, not real-world — custom ADUs realistically take 3–6 months to permit. Over-promising the timeline is a scam tell, not a flex.
• Can't name your zone or talk LADBS/ePlanLA. If a rep can't speak to R1/RD2/R3 or the city's plan-check portal, they're a salesperson, not a builder.
• No verifiable recent projects. The strongest proof is a real, recently completed LA address you can confirm on the LADBS permit portal under their contractor name.
• A vague "1-year warranty." Legitimate builders carry tiered coverage: 10-year structural (SB 800), 2–4 year systems, 1–2 year workmanship.

Want the full breakdown of the LA process the builders in this directory handle for you? See our guides on how to get an ADU permit in Los Angeles, what an ADU really costs in LA, and whether your property can even support an ADU.

ADU builders in Los Angeles: common questions.

How do I find the best ADU builder in Los Angeles?

Start by confirming your property qualifies, then shortlist only contractors who are actively CSLB-licensed (Class B), bonded, and insured, with verifiable recent LA projects and real LADBS permitting experience. 1-800-ADU-Pros pre-vets builders against exactly those criteria and matches you to the right fit for your zone, lot, and budget — so you skip the cold-calling and only talk to pre-screened pros.

Is 1-800-ADU-Pros a contractor?

No. 1-800-ADU-Pros is a referral and pre-qualification service, not a licensed contractor. We don't build anything ourselves and we don't hold a construction license. All construction is performed by independent, California-licensed builders, and each builder's CSLB license number is shown on their profile.

How do I verify a contractor's license in California?

Use the free CSLB "Check a License" tool at cslb.ca.gov. Enter the contractor's license number and confirm the status is ACTIVE, the classification fits an ADU (usually Class B General Building), a $25,000 bond is on file, and workers' compensation is current if they have employees. California law requires the license number to appear on all ads and contracts.

How much deposit can an ADU contractor legally ask for?

In California, a contractor cannot collect a down payment of more than $1,000 or 10% of the contract price, whichever is less. Because an ADU costs far more than $10,000, the legal deposit cap is effectively $1,000. Any "material reservation," "lumber-lock," or "pre-construction" fee that pushes your up-front payment above $1,000 is a red flag for an illegal deposit.

How long does an ADU permit take in Los Angeles?

State law gives the city 60 days to approve or deny a complete application, and pre-approved LADBS Standard Plans can be permitted in roughly 21–30 days. But the 60-day figure is statutory, not a real-world guarantee — custom ADU permits in LA realistically take about 3–6 months once you factor in completeness review and correction cycles. Be wary of any builder who promises a 30-day permit on a custom build.

Is the $40,000 CalHFA ADU grant still available?

No — the CalHFA $40,000 ADU grant is currently paused and out of funds. The last round was fully allocated within days in December 2023, and there is no confirmed relaunch date. It may reopen if the state appropriates new funding, so verify directly at calhfa.ca.gov before counting on it. Most homeowners pay with cash or home equity (HELOC or cash-out refinance); see our financing guide for the current options.

What should I ask an ADU builder before hiring them?

Ask for their CSLB license number and verify it yourself; ask what zone your lot is in (a real builder answers in seconds); ask for a fully itemized fixed-price quote that names utility connections as a line item; ask for recent LA project addresses you can verify on LADBS; ask who handles permitting and how the timeline works; and confirm the deposit is no more than $1,000.