Bay Area ADU research desk

Compare ADU builders and city fit before requesting bids.

Start with source-backed builder profiles, then check the city page that will shape permits, site work, utility assumptions, and timeline.

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10 provider profiles

15 Bay Area cities

1 blog articles

Builders

Start with builder fit, not sales claims.

Each profile shows service fit, city coverage, source links, verification status, and the questions homeowners should ask before trusting a bid.

Featured profile

Acton ADU

ADU specialist with Build Ready and Custom site-built paths

Model ADU Builders / ADU Companies +3

Cities Campbell, Cupertino, Los Altos, Los Gatos, Mountain View, Palo Alto, San Jose, Santa Clara, Saratoga, Sunnyvale

View profile Ask about fit

Bright compact ADU interior with warm finishes

Featured profile

FabuHome

Budget-first ADU planning and design-build path

Model ADU Builders / ADU Companies +3

Cities Burlingame, Cupertino, Los Gatos, Mountain View, Palo Alto, Redwood City, San Jose, San Mateo, Santa Clara, Saratoga, Sunnyvale

View profile Ask about fit

Backyard site work before ADU construction

Featured profile

Villa

Prefab detached ADU with turnkey delivery and permit support

Model ADU Builders / ADU Companies +1

Cities Cupertino, Fremont, Mountain View, Palo Alto, Redwood City, San Jose, San Mateo, Santa Clara, Sunnyvale

View profile Ask about fit

Source noted

Red Shed Studio

Custom ADU design-build and garage conversion for San Jose/South Bay lots

Model ADU Builders / ADU Companies +3

Cities Los Gatos, Mountain View, Palo Alto, San Jose, Santa Clara, Saratoga, Sunnyvale

View profile Ask about fit

Source noted

VitalizeBuild Construction

Custom and predesigned ADU design-build for complex Bay Area lots

Model ADU Builders / ADU Companies +3

Cities Campbell, Cupertino, Fremont, Los Altos, Milpitas, Mountain View, Palo Alto, Redwood City, San Jose, San Mateo, Santa Clara, Saratoga, Sunnyvale

View profile Ask about fit

Source noted

HAUS+

Full-service hybrid prefab ADU for design-forward Bay Area yards

Model ADU Builders / ADU Companies +2

Cities Burlingame, Fremont, Mountain View, Palo Alto, Redwood City, San Jose, San Mateo, Santa Clara, Sunnyvale

View profile Ask about fit

View all builders

Cities

Use the city page before comparing bids.

City pages keep the local permitting context, official source links, common project types, and provider coverage in one place.

Burlingame Peninsula Campbell South Bay Cupertino South Bay Fremont East Bay Los Altos South Bay Los Gatos South Bay Milpitas South Bay Mountain View South Bay Palo Alto Peninsula

Modern ADU interior rendering — Local process first. Scope second. Builder comparison third.

Blog

Put deeper topics in articles, not extra hub pages.

How Much Does an ADU Cost in the Bay Area in 2026?

In 2026, a realistic Bay Area ADU budget usually starts around $120k-$300k for a permitted garage conversion, $250k-$500k+ for many prefab installed paths, and $300k-$650k+ for a detached custom ADU. The number moves fast once utilities, foundation, site access, fire review, plan corrections, and finish level enter the room.

10 min read