Plans, Permits & Design in Hidden Hills

City of Hidden Hills Building and Safety Department. Permits come from the City of Hidden Hills Building and Safety Department, whose plan check, permit issuance and inspection services are provided under contract by Transtech. The City does not issue a building permit until the Hidden Hills Community Association Architectural Committee has approved the exterior design, and that approval covers dwellings, garages, stables, pools, courts, fences and accessory structures. The community's one-acre minimum building site rule and recorded bridle-trail easements both constrain where structures can physically go. The city falls within a very high fire hazard severity zone under CAL FIRE's 2025 local responsibility area mapping. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing the city.

One-acre minimum building sites, mostly flat to gently rolling, with barns, arenas and long private driveways and enough rear yard to plan a pool, guest structure and equestrian improvements as one project. In practice that means recorded bridle trail easements cross most parcels and dictate where a pool, guest house or perimeter fence can actually be placed..

All of it, including Ashley Ridge, Long Valley Road, Round Meadow, Jed Smith Road. We are based in Los Angeles at Cahuenga Pass, so Hidden Hills is a short run for our crews rather than a job we service from out of the area.

Plans, drawings and permit management in this market generally runs $4,500 to $25,000+. What moves it is project type and size, whether structural engineering, Title 24 or a soils report is required, and how many jurisdictions or review bodies are involved. We give line-item pricing after seeing the site rather than quoting a number over the phone.

Yes. Plans and permits is a service we sell on its own, and plenty of clients use us for the drawing set and permit management and build with someone else. We would rather do it properly than tie it to a construction contract.

Because the required consultants vary. A straightforward patio cover needs a modest set. An ADU on a sloped lot may need structural engineering, Title 24, a soils report and a survey, and each of those is a separate specialist fee on top of the city's own plan-check and permit charges.

Most commonly incomplete structural detail, missing Title 24 forms, drainage not shown, or a discrepancy between the site plan and the survey. Corrections are normal, not a failure. The thing that costs time is a slow response to them, which is why we act as the applicant.

Yes, where a community requires it. HOA architectural review runs on its own calendar and its own standards, entirely separately from the city, and starting it late is one of the most common reasons a project slips.