Top ADU Contractors in San Jose (2026)

Vetted professionals specializing in custom builds, prefabs, and garage conversions. Average San Jose costs range around $340,000.

Get 3 free quotes from verified San Jose ADU builders

We pre-screen San Jose ADU contractors for licensing, insurance, and ADU-specific experience. Match request takes 60 seconds.

Get 3 free quotes from vetted San Jose ADU builders

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Step 1: ProjectStep 2: Contact
4001,500

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How We Select Contractors

Verified Licenses & Insurance
Specialized ADU Experience
Positive Local Reviews

Featured San Jose ADU Builders

Cottage

8 Years in Business
Full-Service ADU

Bay Area ADU specialists with strong San Jose permitting experience and fixed-price contracts.

Price: $200k–$400k San Jose

Acton ADU

10 Years in Business
Prefab / Modular

Factory-built ADUs. Pre-approved designs speed up San Jose permitting to 4–8 weeks.

Price: $180k–$350k San Jose

Villa Homes

7 Years in Business
Turnkey + Financing

Zero-down ADU builder that handles design, permits, construction, and financing in one package.

Price: $200k–$380k San Jose

Symbium

5 Years in Business
Prefab / AI-Optimized

Uses AI to analyze your lot and recommend optimal ADU placement. Fast permitting with pre-approved plans.

Price: $150k–$300k San Jose

GatherADU

6 Years in Business
Design-Build

End-to-end ADU service from feasibility study through construction. Experienced with San Jose zoning.

Price: $190k–$320k San Jose

Greatland Construction

18 Years in Business
Custom Builds

Premium custom builder with deep experience in Silicon Valley's seismic requirements and hillside builds.

Price: $250k–$450k San Jose

Get 3 free quotes from verified San Jose ADU builders

We pre-screen San Jose ADU contractors for licensing, insurance, and ADU-specific experience. Match request takes 60 seconds.

Get 3 free quotes from vetted San Jose ADU builders

No spam. No obligation. Avg response time: 1 business day.

Step 1: ProjectStep 2: Contact
4001,500

We never sell your data. You control which builders contact you.

ADU Contractor Red Flags

  • Requires more than 10% down payment upfront
  • Doesn't handle the permitting process
  • Gives an estimate without seeing the property
  • Lacks specific ADU portfolio (just general remodeling)
  • Pressures you to sign immediately

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Get 3 free quotes from verified San Jose ADU builders

We pre-screen San Jose ADU contractors for licensing, insurance, and ADU-specific experience. Match request takes 60 seconds.

Get 3 free quotes from vetted San Jose ADU builders

No spam. No obligation. Avg response time: 1 business day.

Step 1: ProjectStep 2: Contact
4001,500

We never sell your data. You control which builders contact you.