ADU Contractors in Los Angeles County, CA

Los Angeles County is the largest ADU market in California: 88 incorporated cities plus unincorporated county areas, each setting its own ADU fees, forms, and review timelines on top of state law. This directory lists 32,520 active, license-verified contractors with an office of record in the county — general builders (A and B) plus the licensed trades ADU projects use (C-10 electrical, C-36 plumbing, C-5 framing) — from the Antelope Valley and Santa Clarita through the San Fernando and San Gabriel valleys to Long Beach and the South Bay.

Because the rules change at the city line, verify two things before you hire: that the license is active today (every profile here links to CSLB for a live check), and that your city's current ADU rules allow the project you have in mind. Our ADU permit process guide walks through how approvals actually flow, city by city.