ADUs & Additions in Corona

City of Corona Planning & Development Department, Building Division. The Building Division is one of four divisions in the Planning & Development Department, alongside Planning, Code Compliance and Development Services, and works from 400 South Vicentia Avenue on a Monday-through-Thursday schedule, closed Fridays. Plans are submitted and tracked through the city's eTRAKiT portal. The division's pool advisory requires Development Services and Planning approval before a pool goes to building plan check, structural plans prepared and stamped by a licensed architect or engineer, and a soils report wherever the Building Official calls for one; barbecue islands that include a sink also require plan review. Chapter 7A ignition-resistant construction applies in the mapped Very High Fire Hazard Severity Zone, the city's 2025 map update extends that standard to High zones once adopted, and applicants are asked to verify a parcel's zone before plan check. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.

Two broad patterns: the original grid of streets enclosed by Grand Boulevard, and the later specific-plan communities, where development standards are set plan by plan. Slope position and fire hazard mapping vary from lot to lot, so both are checked before design starts. One local condition that shapes the work: A pool shell closer than seven feet to the top of a slope must be engineered to hold its water without soil support, and near the toe of a slope steeper than one in three the setback is a quarter of the slope height, so slope position often decides where a pool can sit.

All of it, including Sierra Del Oro, Corona Ranch, Mountain Gate and Eagle Glen. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.

Detached ADU: generally $150,000 to $400,000+ across Southern California. 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.