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Bay Area ADU Builders

9Builders

Based in San Jose, Santa Clara County

#7 of 24 on our public score

Builds
Detached, Attached, Garage conversion, Junior ADU, plus ready-made plans
Works in
12 of our citiesSan Jose, Santa Clara, Sunnyvale and more
  • CSLB #1132916 active
  • Class B
  • Licensed since 2025
  • Bonded $25,000
  • Workers' comp on file
  • No public complaints on CSLB

From the CSLB record, read Oct 18, 2026. Full license details

See its work and what customers say

No Houzz listing found as of Oct 18, 2026. Ratings and reviews are on the linked listings.

License details

License number
#1132916 (active)
Class
B
Licensed since
2025 (1 year)
Expires
02/28/2027
Name on the license
9 BUILDERS INC
Bond
Western Surety Company $25,000
Workers' comp
State Compensation Insurance Fund, exp 10/09/2027
From the CSLB record, read Oct 18, 2026. Check it live on CSLB

What it builds

Only what the company shows on its own site. Links go to the builder's site where we read it.

Cities it lists that we cover

From its service-area page: “We primarily serve the San Jose and greater Bay Area, including Santa Clara, Sunnyvale, Campbell, Los Gatos, Saratoga, Cupertino, Mountain View, Palo Alto, Fremont, Los Altos, Milpitas” It may name more cities than the 18 we cover; see its full list.

Prices it publishes

  • “A typical detached ADU ranges from $150,000 to $350,000.”

    Source page. Read Oct 18, 2026.

  • “Bay Area ADU costs range from $150,000 to $400,000 depending on size, design, and local requirements.”

    Source page. Read Oct 18, 2026.

Reviews

Read what customers say on the review sites below. We don't score reviews yet, because we only score what we can check ourselves.

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