Region guide / San Mateo County, CA
Find builders, designers and plan vendors to research for your project. Search by name, service or city, then review the evidence behind each listing.
Listings are drawn from public sources and may be incomplete or dated. They are not endorsements. Confirm ADU experience, service area and current licensing before hiring.
66 matching records · Showing 1–12
preapproved plan vendor · license evidence: 1132916
749 sq. ft. 2 bedroom 1 bath ADU
The source lists these plans as under review, not approved. Confirm current status with the city.
Source record: 2026-05-20
View listing source ↗Provider websiteprefab modular
Listed on San Mateo County Second Unit Center vendor-fair list as a modular/SIP/kit builder
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websiteprefab modular
Provider is a Bay Area prefab ADU company and appears on the San Mateo County Second Unit Center vendor-fair list
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitedesign build
Listed on San Mateo County Second Unit Center vendor-fair list as a design/build provider
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websiteproject manager
Listed on San Mateo County Second Unit Center vendor-fair list as a full-service ADU builder/provider/converter
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitearchitect designer · 4 permit contacts
Appears as applicant on Redwood City issued permit snippets for an ADU and related residential work
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitecontractor · license evidence: 914001
Provider website advertises ADU construction throughout Alameda and San Mateo Counties
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitecontractor · license evidence: 1086047
Provider page advertises ADU and home additions in Menlo Park
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitepreapproved plan vendor · license evidence: 1104475
499 sq. ft. 1 bedroom 1 bath ADU
The source lists these plans as under review, not approved. Confirm current status with the city.
Source record: 2026-05-20
View listing source ↗Provider websitedesign build
Provider website lists accessory dwelling units and San Mateo County/Peninsula service areas
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitearchitect designer
Listed on San Mateo County Second Unit Center vendor-fair list as an architect
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider websitedesign build · license evidence: 1011701
Provider website and project snippets show architecture/building services and ADU projects in Oakland/Bay Area
Found in public source research. ADU experience, service area and current license require confirmation.
Source record: 2026-05-20
View listing source ↗Provider website