ADUs & Additions in Westlake Village

Los Angeles County Department of Public Works, Building and Safety Division (under contract to the City of Westlake Village). The City contracts with Los Angeles County for building and safety, so plan check, permit issuance and inspections are handled by the County Department of Public Works Building and Safety Division through its Calabasas office and the EPIC-LA online system, while planning and design review stay with the City's Planning Department at City Hall. Design review is required for residential development under the R-1 and RPD standards. Parcels inside the Hillside Management Area pick up slope-specific setbacks, ridgeline protection and grading limits, and most neighborhoods also carry HOA architectural review, with waterfront parcels answering separately to the lake association for dock and shoreline work. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing the city.

Mostly planned-development parcels: modest, well-defined rear yards in the older neighborhoods, waterfront lots with dock frontage on the island, and larger slope-backed lots along the hillside edges. In practice that means lakefront and near-lake parcels sit on filled and reworked ground with shallow groundwater, which changes pool shell design, dewatering and retaining detail..

All of it, including Westlake Island, First Neighborhood, Three Springs, Watergate. We are based in Los Angeles at Cahuenga Pass, so Westlake Village 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.