ADU builder · Long Beach, CA
ADU builder in Long Beach.
Design, permits, financing and construction from one local team. 600+ ADUs delivered across greater LA, including projects in and around Long Beach.
Licensed & insured · Construction from $275/sq ft · 5.0★ rated
Building an ADU in Long Beach
Long Beach is one of the busiest ADU cities in LA County. It issued about 671 ADU permits in 2023, about 747 in 2024 and about 644 in 2025, per state housing reports. In 2023 and 2024 that was second only to the City of Los Angeles among LA County cities. Lots near the water add a layer, since parts of the city are in the coastal zone.
ADU Resource Center designs, permits and builds ADUs in Long Beach with one in-house team. Here we built a 400 sq ft detached one-bedroom with a ceiling vaulted to 12 feet, a linear fireplace and full-size kitchen appliances, since the owners plan to rent it. To make room, the crew moved the couple's backyard shed in one piece. We also build in Torrance and Downey, and nearby projects include Bellflower, San Pedro, El Segundo and Huntington Beach.
If you're building to rent, a fixed quote before construction lets you plan your budget with real numbers. One project manager handles design, permits and the build, and we can help you arrange financing.
ADUs in Long Beach: quick facts
Updated November 2026
- Who issues ADU permits
- City of Long Beach
- Our construction rates
- $275, $300 or $325 per sq ft (basic, mid-range, luxury); garage conversions $235–$285 per sq ft
- Example cost
- A 600 sq ft one-bedroom runs about $165K–$195K in construction
- Size limits under state law
- Detached ADUs up to 1,200 sq ft on many lots; junior ADUs up to 500 sq ft inside the home
- Permit decision
- State law requires a decision within 60 days of a complete application
- Who builds it
- ADU Resource Center: design, permits and construction by one team, 600+ ADUs delivered, office in Glendale
ADU rules change. We confirm the current rules for your lot on the free consultation.
Real projects in and around Long Beach
Our work in and around Long Beach.
Hear it from our clients
Homeowners on building their ADU with us
More stories on our testimonials page.
Local know-how
What to know before building in Long Beach.
Long Beach Development Services
Long Beach handles its own ADU permits through Development Services. We prepare the plans, submit them and answer the corrections.
Coastal-zone parcels
If your lot is in the coastal zone, the ADU can need a local coastal development permit in addition to the building permit. We check the city's coastal zone boundary for your address at the start.
Built to rent
Many Long Beach owners build to rent. Full-size appliances, a washer and dryer, and good storage help a small unit work for a tenant. The financing guide covers how owners pay for it.
Picking a size
A 400 to 500 sq ft one-bedroom can fit where a larger unit won't, and it keeps construction cost down since our rate is per square foot. Browse floor plans by size.
What it costs
ADU cost in Long Beach
We build at a flat rate per square foot: $275 (basic), $300 (mid-range) and $325 (luxury) finishes. Here's what that means for common sizes. Construction only; design, permits and city fees are quoted separately on your consultation.
| ADU size | Basic | Mid-range | Luxury |
|---|---|---|---|
| 400 sq ft studio | ~$110K | ~$120K | ~$130K |
| 600 sq ft 1-bedroom | ~$165K | ~$180K | ~$195K |
| 800 sq ft 2-bedroom | ~$220K | ~$240K | ~$260K |
| 1,000 sq ft 2–3 bedroom | ~$275K | ~$300K | ~$325K |
Get a number for your exact size: ADU cost calculator · Browse ADU floor plans · Converting a garage? See garage conversion cost.
Free consultation
Start your Long Beach ADU.
Tell us about your property. We'll confirm what's buildable, give you a real price range and walk through financing within 1 business day.
Questions
Long Beach ADU questions, answered.
Still have a question? Ask us during your free consultation.
Who issues ADU permits in Long Beach?
Long Beach is its own city, so ADU plans go to Long Beach Development Services, which covers planning and building permits. Parcels in the coastal zone can need a coastal permit on top of that. We prepare and submit everything, answer plan-check corrections and pull the permits.
Do coastal-zone lots in Long Beach need extra approval?
Often they do. City records show ADUs in the coastal zone going through a local coastal development permit, and some of those decisions can be appealed to the Coastal Commission. The rules for coastal ADUs have been changing, so we confirm the current path with the city for your address.
How much does an ADU cost in Long Beach?
Our construction rate is a flat $275, $300 or $325 per sq ft for basic, mid-range or luxury finishes. That puts a 600 sq ft one-bedroom around $165K–$195K, and a 400 sq ft unit lower, since the rate is per square foot. Coastal permits, utility upgrades or moving existing structures can change the fixed quote.
Is 400 sq ft big enough for a one-bedroom?
It can be. Our Long Beach ADU is 400 sq ft with one bedroom, one bath and full-size kitchen appliances, and a ceiling vaulted to 12 feet keeps it from feeling small. The owners compared 400 and 500 sq ft versions on screen with our designer before picking the smaller one to fit their budget.
Can I convert my garage in Long Beach?
Usually, yes. A garage conversion reuses the slab, walls and roof, and our rate for one is $235–$285 per sq ft. State law doesn't require new setbacks for an existing garage being converted. Older garages can need foundation or framing work first, and we check that on the site visit.
Free consultation
Ready to build your ADU in Long Beach?
Tell us about your property and we'll confirm what's buildable, give you a real price range and lay out financing on one free call.
