ADUs & Additions in Yorba Linda

City of Yorba Linda Community Development Department, Building Division. The Community Development Department covers Planning, Building and Community Preservation; the Building Division at 4845 Casa Loma Avenue handles plan review, permit issuance and construction inspection. As of April 2026 the division replaced unscheduled walk-in service with a scheduled appointment program for over-the-counter plan check, code consultations and large project submittals, so counter time should be booked rather than assumed. Large portions of the hillside and canyon areas are mapped in a Very High Fire Hazard Severity Zone, which brings ignition-resistant construction and defensible space requirements into scope. Hillside grading review and slope setbacks apply to many rear yards, and equestrian trail easements recorded across residential parcels restrict what can be built over them. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing the city.

Generous, low-density lots by Orange County standards, frequently a quarter acre or more, with a flat pad up front and a graded slope at the rear. Custom and semi-custom hillside parcels are considerably larger and steeper. In practice that means long descending rear slopes mean the flat, buildable portion of a lot is often much smaller than the parcel size suggests, and top-of-slope setbacks govern shell and footing placement..

All of it, including East Lake Village, Vista Del Verde, Kerrigan Ranch, Bryant Ranch. We are based in Los Angeles at Cahuenga Pass, so Yorba Linda 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.