Best ADU Builders in Long Beach, CA
Compare vetted, CSLB license-verified ADU builders and ADU contractors in Long Beach. The average cost to build an ADU in Long Beach is $280–$420 per square foot. Top-rated builders include Acton ADU, ADU West Coast, Cornejos Builders ADU Construction & Home Building.
Every builder below is CSLB license-verified, bonded, and insured — vetted before they ever reach a homeowner. Browse ratings and real reviews, compare starting prices, or let us match you with the best fit for your lot and budget. It's free; we're paid by the builders, not you.
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What kind of ADU are you planning?
ADU activity in Long Beach
ADU projects in Long Beach commonly budget $280-$420 per sq ft, or about $224,000-$336,000 for an 800 sq ft ADU, before site conditions, utility upgrades, and finish choices.
Showing 10 of 10 builders in Long Beach, CA
Last updated July 16, 2026
License VerifiedActon ADU
Serving Long Beach, CA · Campbell, CA
“We had a great experience working with Acton ADU on our ADU project, and I want to give a special shoutout to Sandro. Sandro was fantastic from start to finish—…”— N K
Pricing on request
A California general building contractor licensed since 1992, serving the LA market statewide.
License VerifiedADU West Coast
Serving Long Beach, CA · Seal Beach, CA
“Recently, I’ve had the opportunity to work with Cameron and the ADU West Coast team on a new home project. I am extremely impressed with their services that oth…”— Max “MaxMufc2018” T
Pricing on request
CSLB-verified B contractor in Seal Beach, CA.
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License VerifiedCornejos Builders ADU Construction & Home Building
Serving Long Beach, CA · Downey, CA
“Alex and his team were very easy to work with. They helped us build a JADU and ADU. He handled the planning and permitting of both units. As well as the inspect…”— Esther Rosas
Pricing on request
CSLB-verified B contractor in Downey, CA.
License VerifiedElite Builders & Design
Serving Long Beach, CA · Long Beach, CA
“We had our bathroom & kitchen & windows fully renovated by Elite Builders & Design. Gabriel walked us through the process, was attentive and quick to reply, and…”— Brendon Chung
Pricing on request
CSLB-verified B contractor in Long Beach, CA.
License VerifiedBaldwin Builders
Serving Long Beach, CA · Covina, CA
“I have had the pleasure of knowing Tony Ferro, owner of Baldwin Builders, both personally and professionally and I cannot recommend him and his team highly enou…”— carolyn cooney
Pricing on request
California's firefighter-owned ADU and home-addition builder serving LA, Orange & Riverside counties.
License VerifiedThe ADU Pro
Serving Long Beach, CA · Chino, CA
“Dj,Bryan, and Bruno were awesome dad past away a couple years ago and my wife and I decided to build the adu for mom. They took the worries out of it. They alwa…”— neil lisenby
Pricing on request
Southern California's design-build ADU specialist — detached, attached, garage conversions and JADUs.
License VerifiedVilla Homes
Serving Long Beach, CA · San Francisco, CA
“Excellent job! The Villa crew from start to finish nothing short of professional. Foundation, home delivery, finish work etc top notch. I would recommend Vill…”— M Ferreira
Pricing on request
Tech-enabled prefab ADU builder delivering turnkey backyard homes across California.
License VerifiedNestadu
Serving Long Beach, CA · Mill Valley, CA
“Nestadu did a great job on my backyard ADU. Their team was professional, and the final result looks fantastic—well-built and blends in nicely with my home. Pric…”— Stephen Reid
Pricing on request
Custom and prefab ADUs for California homeowners — design, permit, and build, turnkey.
License VerifiedADU Certified
Serving Long Beach, CA · Long Beach, CA
“Dimas was great. He was affordable. Our ADU looks so luxurious. All our friends and family love it. Dimas runs a clean jobsite. We are very pleased with how the…”— Garrett Stack
Pricing on request
CSLB-verified B contractor in Long Beach, CA.
License VerifiedGather ADU
Serving Long Beach, CA · Northridge, CA
New to the directory
Pricing on request
LA's full-service ADU experts — design, permits, and construction under one roof.
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Frequently Asked Questions
- How much does it cost to build an ADU in Long Beach, CA?
- In Long Beach, ADUs typically run $280–$420 per square foot all-in. A detached 800 sq ft unit commonly lands between $230k and $340k depending on finishes, site conditions, and utility connections. Garage conversions are the most affordable path, often under $180k.
- How long does it take to build an ADU in Long Beach?
- Plan to budget 6–12 months end to end. California law caps ADU plan check at 60 days for compliant designs, and construction usually takes 4–8 months after permits are issued.
- Do I need a permit to build an ADU in Long Beach?
- Yes. All ADUs require a building permit, but California mandates ministerial (non-discretionary) approval for compliant units, so there's no public hearing or design review. Your builder typically pulls the permit on your behalf.
- How do I choose a builder in Long Beach?
- Confirm the contractor holds an active CSLB license, is bonded and insured, and has built ADUs in Long Beach specifically. Every builder in this directory is license-verified. Use "Get a Quote" to be matched with the best fit for your lot and budget.
ADU costs in Long Beach: city vs. metro vs. state
Building an ADU in Long Beach runs roughly $280–$420 per square foot all-in. Here's how the city benchmarks against the broader metro and statewide averages.
| Area | Avg. cost / sq ft | Typical 800 sq ft ADU |
|---|---|---|
| Long Beach | $280–$420 | $224,000–$336,000 |
| Long Beach metro | ~$350 | ~$280,000 |
| California (CA) | ~$330 | ~$264,000 |
Cost by ADU type in Long Beach
| ADU type | Typical size | Project cost | Timeline |
|---|---|---|---|
| Detached ADU | 600–1,200 sq ft | $180,000–$420,000 | 8–12 months |
| Attached ADU | 400–800 sq ft | $140,000–$300,000 | 6–10 months |
| Garage Conversion | 400–600 sq ft | $90,000–$180,000 | 4–7 months |
| JADU (Junior ADU) | ≤ 500 sq ft | $60,000–$140,000 | 3–6 months |
ADU rules & permits in Long Beach, CA
Long Beach is an independent jurisdiction, so ADU permits run through the local building department under California's statewide ADU law. Confirm city-specific submittal requirements, fees, and inspection timing before hiring.
| Jurisdiction | Permit timeline | Permit fees | Notes |
|---|---|---|---|
| Long Beach (independent city) | 60 days max by CA statute | Set by local ordinance | Permits are issued by the Long Beach building department, not the City of Los Angeles |
| Statewide (CA) | 60 days max by statute | Varies | Ministerial approval; owner-occupancy requirement waived through 2030 |
Financing your ADU in Long Beach
Most Long Beach homeowners compare renovation loans, construction loans, HELOCs, and cash-out refinancing. ADU-focused lenders can underwrite against after-build value when the new unit materially increases rent or resale potential.
Construction / renovation loan
Funds released in draws as the build hits milestones; underwritten against after-build value.
HELOC / home equity
Borrow against existing equity. Fast to set up if you have 20%+ equity.
Cash-out refinance
Replace your mortgage and pull equity as cash — best when rates are favorable.
ADU-specific lenders
RenoFi and similar lenders underwrite the projected value the ADU adds, often unlocking more.
Pre-ADU Checkup — $499 — Get finalized permits, a pre-ADU checklist, and an on-site feasibility visit. Homeowners save $1,000s by doing this before engaging a contractor.