ADUs & Additions in Riverside

City of Riverside Community & Economic Development Department, Building & Safety Division. The Building & Safety Division of the Community & Economic Development Department issues permits from the One Stop Shop at 3900 Main Street, 3rd Floor, with applications and permit records available through the city's Public Permit Portal. The division targets a 20-business-day first review for most new projects and 10 business days for resubmittals and smaller projects, with expedited review available for an added fee. Plan check expires one year after fees are paid unless a 180-day extension is requested in writing, and a residential permit becomes invalid if work has not started within 12 months of issuance. Hillside parcels answer to Proposition R (1979) and Measure C (1987), which applied the Residential Conservation (RC) Zone to hillside areas based on slopes over 15 percent, and exterior changes to designated cultural resources or properties in historic districts need a Certificate of Appropriateness under Title 20. We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.

Unusually varied for one city: period homes in the designated historic districts, larger residential-agricultural parcels zoned RA-5 in the Arlington Heights Greenbelt, and hillside lots on the city's uplands, where the RC Zone applies to slopes over 15 percent. One local condition that shapes the work: On hillside lots the RC Zone and the Grading Code's hillside standards govern how much a site can be reshaped, so the grading approach for a pool, terrace or accessory structure is settled before the design is.

All of it, including Wood Streets, Mount Rubidoux, Alessandro Heights and Hawarden 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.