Tpi General Contractor
Apex Build & Investments Inc
BEvery contractor below holds an active California license with an office of record in Westlake Village, verified against CSLB public data as of November 6, 2026: general builders — A (General Engineering) and B (General Building), the classifications that can build an ADU — and the licensed trades ADU construction uses, C-10 Electrical, C-36 Plumbing and C-5 Framing & Rough Carpentry. Listings are alphabetical; the featured builder is labeled, never ranked.
ADU rules — setbacks, size limits, parking, and fees — are set by the local jurisdiction and change often. Before you hire, read the ADU permit process guide and the Southern California ADU cost guide, and verify any license free at CSLB.
Mars Construction Industries Corp
ADU Cities' own design-build team
CSLB #1138550 · A · B · C-36 · C-20
Building ADUs across Los Angeles, Orange, Riverside, San Bernardino, San Diego & Ventura counties
217 license-verified contractors based in Westlake Village — page 5 of 5
Apex Build & Investments Inc
BChristianson Eugene D
BC-36Be Innovative Roofing & Remodeling Inc
BC-39Johnson Douglas W
BC-10AQ4 Building Solutions
BAir Solutions And Beyond Inc
BC-10C-17C-20C-36Data source: CSLB public records as of November 6, 2026 · Verify any license at CSLB