California / Builders / Prime Design & Build
Licence verified, no local permit history
CSLB #1087809 · PRIME DESIGN & BUILD · Corporation
Design-build ADU contractor based in Campbell. Builds detached ADUs, garage conversions, interior conversions and manufactured ADUs. Says it serves 4 California cities.
No ADU permits are on file under this licence in the cities we cover. Most California cities do not publish the contractor's name on a building permit, so this usually reflects what a city discloses rather than what a builder has built. Ask them directly for recent addresses and permit numbers you can look up.
The company’s own description · licence shown on their advertising matches the state register
BBB customer reviews; BBB business rating separately listed as A+BuildZoomGoogle Business ProfileHouzzYelp — San JoseYelp — San MateoLinkedIn
ADU Standards does not issue zoning determinations and does not endorse contractors. Licence details are from the California Contractors State License Board, checked 2026-08-15. A city that pre-approves a plan has vetted the plan, not the builder. Always confirm licence standing at cslb.ca.gov before you sign anything.