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ADU builder in San Gabriel, CA
San Gabriel has one of the San Gabriel Valley’s busiest ADU markets: permits rose about 66% in 2024. Its ordinance has some specific limits, including a two-bedroom maximum, so we design to them from day one.
San Gabriel Valley
Building an ADU in San Gabriel.
What’s different about adding an ADU here, and how we plan around it.
Know the local caps
San Gabriel’s code caps detached ADUs at 850 sq ft for a studio or one-bedroom and 1,000 sq ft for two bedrooms, with a two-bedroom maximum. An 800 sq ft ADU with 4 ft side and rear setbacks is always allowed under state law.
Attached and garage-conversion options
Attached ADUs can reach up to 25 ft and two stories, limited to the smaller of 50% of the house or the detached size cap. Converting an existing garage or accessory building isn’t subject to the size caps.
A fast-growing ADU city
San Gabriel issued 106 ADU permits in 2024, up from 64 the year before. Busy permit counters mean experienced reviewers, and the state’s 60-day review deadline applies.
Plans that fit
Floor plans that work within San Gabriel’s rules.
These ready-to-build plans fit San Gabriel’s size, height and bedroom limits. Our studio can adjust any of them to your lot.
Plan 400B
Studio · 1 Bath · 400 ft²
Plan 440
1 Bed · 1 Bath · 440 ft²
Plan 500A
1 Bed · 1 Bath · 500 ft²
Plan 537
2 Bed · 1 Bath · 537 ft²
Plan 832
2 Bed · 1 Bath · 832 ft²
How we work in San Gabriel
One team from first visit to move-in.
01
Free ADU analysis
We review your San Gabriel lot, what the local rules allow and which plans fit, with an estimated cost.
02
Design
Our in-house studio prepares construction-ready plans in about 1–2 months.
03
Permits
We submit to the City of San Gabriel and handle every round of plan check.
04
Fixed-price build
Construction in about 4–5 months, managed by one project manager from our Long Beach office.
San Gabriel ADU questions
Common questions in San Gabriel.
How big can an ADU be in San Gabriel?
A detached ADU can be up to 850 sq ft as a studio or one-bedroom, or 1,000 sq ft with two bedrooms. A state-protected 800 sq ft ADU is always allowed regardless of lot coverage.
Can I build a three-bedroom ADU in San Gabriel?
Not under the city’s ordinance, which caps ADUs at two bedrooms. A three-bedroom layout would need to be a different housing type; our analysis covers the options.
How tall can an ADU be in San Gabriel?
Detached ADUs are generally limited to 16 ft (one story). Attached ADUs can be up to 25 ft and two stories when connected to the main house.
Nearby
We also build in
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Planning an ADU in San Gabriel?
Tell us about your San Gabriel property and we’ll prepare a free ADU analysis: what fits on your lot, the rules that apply, recommended plans, estimated cost and timeline.
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Serving homeowners throughout Los Angeles and Orange County.