ADUs & Additions in Los Angeles

Los Angeles Department of Building and Safety (LADBS). LADBS issues residential building, grading, plumbing, electrical and pool permits citywide, with Development Services Centers downtown and in Van Nuys, West Los Angeles, South Los Angeles and San Pedro, while zoning entitlements and design review come from Los Angeles City Planning. Parcels inside a designated hillside area fall under the Baseline Hillside Ordinance (No. 184,802), which caps grading quantity, floor area, height and retaining wall dimensions. A large share of the city sits in a Methane Zone or Methane Buffer Zone under Ordinance 175,790 where mitigation must be addressed before permits issue, and coastal neighborhoods such as Venice and Pacific Palisades additionally require a Coastal Development Permit. Protected trees and shrubs — oak, western sycamore, Southern California black walnut, California bay, Mexican elderberry and toyon — are regulated under Ordinance 186,873 at four cumulative inches of trunk diameter and need an Urban Forestry permit; review length varies by parcel and scope. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing the city.

Lot character varies enormously, from 5,000-square-foot flat R1 parcels in the older grid neighborhoods to steep, irregular hillside lots where usable outdoor space has to be manufactured with retaining structures and cantilevered decking. In practice that means soil swings from deep alluvial fill on the valley floors to weathered bedrock and old landslide debris in the hills, so the geotechnical report drives foundation and pool shell design more than the architecture does..

All of it, including Hancock Park, Los Feliz, Silver Lake, Cheviot Hills. We are based in Los Angeles at Cahuenga Pass, so Los Angeles is a short run for our crews rather than a job we service from out of the area.

Detached ADU in this market generally runs $150,000 to $400,000+. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.

Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.

Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.

California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.

Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.