ADUs & Additions in Brea

City of Brea Community and Economic Development Department, Building & Safety Division. Residential permits are issued by the Building & Safety Division at 1 Civic Center Circle, which accepts building permit applications through the city's online permit center and coordinates review among several city departments. Properties designated Hillside Residential are subject to the city's Hillside Zoning Ordinance, which sets standards for density on slopes, ridgeline preservation, grading and retaining walls, and all new structures in the High and Very High Fire Hazard Severity Zones must meet the city's wildland interface construction standards, with examples including automatic fire sprinklers, Class A roof coverings, one-hour fire-rated exterior walls, spark arrestors on chimneys and site landscape fuel modification. For a resource listed on the city's Historic Resources Register, minor exterior alterations, including remodeling and additions, require a plan review, and the Planning Commission reviews any major alteration at a public hearing. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.

The historic core around City Hall Park still holds a traditional grid street pattern, while neighborhoods built from the 1960s through the 1990s are suburban, with curving streets and cul-de-sacs, and more compact, clustered development in the foothills was arranged largely to avoid environmentally constrained land. On land designated Hillside Residential, the General Plan caps density by average slope, from 2.2 units per acre on slopes of 10 percent or less down to one unit per 20 acres where the average slope exceeds 30 percent. One local condition that shapes the work: The city's General Plan Public Safety Element describes many hillside areas as highly unstable, citing steep topography, fractured and unconsolidated bedrock, expansive soils and high erosion potential, and notes that Brea's hillsides have historically experienced many failures, so a hillside pool or terrace should begin with a geotechnical study.

All of it, including Downtown Brea, Olinda Ranch and Tonner Hills. 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.