Who builds ADUs in the Bay Area?

Metricon Homes is a California ADU builder supporting Bay Area homeowners with detached ADU planning, prefab ADU options, custom design, permit coordination, and construction.

Can I build a detached ADU in Bay Area cities?

California allows many properties to add detached ADUs, but Bay Area cities can vary on setbacks, utilities, parking, fire access, and design review. A property-specific feasibility review is recommended.

Are prefab ADUs a good fit for Bay Area lots?

Prefab ADUs can reduce design and construction complexity, but slope, access, utility runs, and local rules determine whether prefab or custom ADU planning is best for a property.

Bay Area ADU Builders | Prefab Steel-Frame ADUs

Bay Area ADU builders

Design-build ADU builders for Bay Area homeowners

Metricon Homes helps Bay Area homeowners plan detached ADUs, prefab ADU options, and custom backyard homes around real lot conditions, city requirements, budget, and construction timelines.

Property-specific feasibility before you commit to a detached ADU direction.
Prefab ADU and custom ADU planning for Bay Area lots, slopes, utilities, and access constraints.
Design, permitting coordination, and construction support from one California builder team.

San Mateo ADU builders

Planning an ADU in San Mateo County? Review local design-build considerations, detached ADU options, and permitting next steps.

Explore San Mateo ADUs

Compare Bay Area ADU plans

See ADU sizes, layouts, bedroom counts, and prefab-friendly plan options before requesting a feasibility review.

Browse ADU plans

View finished project work

Look through Metricon Homes project photos for design quality, construction details, and homeowner inspiration.

Open project gallery

City ADU planning guide

Find your city's Bay Area ADU rules

ADU rules are set city by city, not region-wide. California allows detached ADUs up to 1,200 sq. ft. under the statewide framework, but each Bay Area jurisdiction can set its own local maximum, setbacks, parking and permitting steps. Choose your city below for the specific rules that apply to your property.

Don't see your city listed, or building somewhere else in California? 69 Bay Area jurisdictions are covered above — contact Metricon Homes and we can confirm the rules for any property.

ADU planning resources

Explore Bay Area ADU service areas and planning next steps

Compare nearby ADU city pages, review plan options, and move from early research to a property-specific ADU conversation.

Start here

Compare detached ADU plans

Review sizes, layouts, and configurable ADU options before your feasibility call.

Browse ADU plans

Budget

Understand ADU financing

See common funding paths and how homeowners think about ADU return potential.

Explore ADU financing

Process

Know what happens next

Walk through feasibility, design, permitting, and construction with Metricon Homes.

See how ADUs work

Nearby Bay Area ADU pages

Alameda ADUs Berkeley ADUs Campbell ADUs Concord ADUs Cupertino ADUs Danville ADUs Dublin ADUs Fremont ADUs Hayward ADUs Livermore ADUs Los Altos ADUs

Build Your ADU with Metricon Homes

Metricon Homes helps you plan and build a fully custom Accessory Dwelling Unit tailored to your property, lot, and local regulations. From feasibility and design through permitting and construction, our team manages the entire process so you can add flexible living space, host family, or generate rental income with confidence.

CALL (833) 400-2497

Bay Area ADU Builders

Metricon Homes designs and builds custom and pre-designed ADUs in Bay Area, with a complete path from site feasibility and design through permitting and construction.

Design-build ADU builders for Bay Area homeowners

San Mateo ADU builders

Compare Bay Area ADU plans

View finished project work

Find your city's Bay Area ADU rules

San Francisco County

Alameda County

Contra Costa County

San Mateo County

Santa Clara County

Marin County

Solano County