Prefab ADUs anywhere in California
One fixed all-in price across the whole state. Built in our Lathrop factory, delivered to your backyard and installed in about a week — permits included.
* 26% of all homes permitted in California in 2025 were ADUs — based on HCD Annual Progress Report data.
Licensed builder · Our own factory in Lathrop, CA
Real homes we build, start to finish
Where we build
Find your region
We build across California at the same all-in price. Here is how many ADUs each region permitted in 2025 — and what homes rent for there.
Central Valley
- ADUs permitted, 2025
- 1,152
- Avg. rent, Aug 2026
- $1,785–2,424/mo
ADU permits: California HCD Annual Progress Report data, permits issued in 2025 (updated Oct 2026). Rent: Zillow Observed Rent Index, all homes, August 2026 — metro areas noted per region. Green city tags open our city pages and local ADU guides.
We build anywhere in California. Send your address and we'll check your lot and local rules — free.
One price, statewide
The same all-in price in LA, San Diego or San Jose
No distance fee and no surprises. Launch pricing — 30% off our published home prices — through December 31, 2026.
Every price includes
- Design & HCD-approved plans
- Permits with your city
- Foundation & utility hook-ups
- Delivery & crane — anywhere in CA
- Installation & final inspection
- 2-year warranty
All-in means one fixed price from design to move-in. We confirm it in writing after a free lot check, before you sign.
Get my fixed priceYour rights
California law is on your side
State law sets the rules for ADUs, so your city can't simply say no. Eight rules every homeowner should know:
Your city must approve or deny a complete ADU application within 60 days.
Gov. Code §66317Cities must allow at least an 800 sq ft ADU, whatever your lot coverage.
Gov. Code §66321(b)(3)Side and rear setbacks can't be more than 4 feet.
Gov. Code §66314(d)(7)A detached ADU can be at least 16 ft tall — more near transit.
Gov. Code §66321(b)(4)No impact fees on ADUs of 750 sq ft or less.
Gov. Code §66311.5(c)You don't have to live on the property to rent out your ADU.
Gov. Code §66315From Jan 1, 2027, cities must allow two detached ADUs on a lot with a house (AB 956).
Gov. Code §66323HOA rules can't block an ADU on a lot zoned to allow a single-family home (AB 956).
Gov. Code Civ. Code §4751Summary for homeowners, not legal advice. Based on the California HCD ADU Handbook (2026). Some details depend on your lot and city — we check them for you.
How it works
From your address to move-in, anywhere in California
Free lot check
Send your address. We check zoning, setbacks and utilities and send a fixed price.
Permits
We prepare HCD-approved plans and file with your city.
Built in our factory
Your ADU is built in Lathrop, CA while your foundation is poured.
Delivered & installed
Trucked to your backyard anywhere in California and installed in about a week.
California ADU questions
More in our FAQ and ADU guides, or call (209) 214-6845.
Can I build two ADUs on my lot in California?
Starting January 1, 2027, yes — AB 956 (Chapter 791, Statutes of 2026) requires cities to approve up to two detached, new-construction ADUs with 4-foot side and rear setbacks on a lot with a single-family home. Until then, state law guarantees one detached ADU plus a junior ADU, and some cities already allow more.
Do you build ADUs everywhere in California?
Yes. We build across California — from the Bay Area to Los Angeles, San Diego, the Central Coast, the Central Valley, the Inland Empire and Sacramento. Send your address and we'll check your lot.
Is the price the same outside the Bay Area?
Yes. Our all-in price is the same anywhere in California, with no distance fee. It includes design, permits, foundation, delivery, crane, installation and utility hook-ups.
How much does an ADU cost in California?
Our all-in prices run from $75,900 for a Backyard Studio to $271,900 for a 2 Bedroom ADU, with launch pricing through December 31, 2026.
How many ADUs are built in California?
California jurisdictions issued 32,359 ADU building permits in 2025, according to HCD Annual Progress Report data — about one in four new homes permitted that year.
Can my city say no to an ADU?
State law limits what cities can require: they must decide on a complete application within 60 days, allow at least an 800 sq ft ADU with 4-foot setbacks, and can't require you to live on the property.
How is a prefab ADU delivered?
It's built in our factory in Lathrop, CA, trucked to your property, set on the foundation by crane and finished in about a week.
Can I rent out my ADU in California?
Yes. Cities can't require you to live on the property, but many require rentals of 30 days or longer.
Free · no obligation
Can you build an ADU on your lot?
Send your address. We'll check your lot and local rules and send a fixed all-in price — the same anywhere in California.
HCD-approved plans (#1585366) · 2-year warranty · factory in Lathrop, CA
Sources: California HCD Annual Progress Report data, Table A2 (data.ca.gov, permits issued in 2025, updated October 2026); California HCD ADU Handbook (2026); Zillow Observed Rent Index (August 2026). The 26% share is our calculation from HCD data (32,359 ADUs of 123,733 homes permitted in 2025). Updated October 2026.