Rocklin, CA Accessory Structures: Garage Conversions (2026)

Rocklin's zoning code addresses garage conversions in two different contexts. In the R1-5 zone, the city's old-city single-family zone for lots subdivided before 1977, § 17.10.100 requires every dwelling to provide a garage at least twelve feet wide by twenty feet deep with a matching driveway pad, but subsection C carves out an exception: for a residence built before the zoning title was adopted, a carport is permitted in place of the required garage if the existing garage has been converted to living accommodations. That means an older Rocklin home can turn its garage into a bedroom or den and satisfy its parking obligation with a carport instead of rebuilding a garage.

The second context is accessory dwelling units. Under § 17.67.050(A)(9), converting all or part of an existing garage to create a junior accessory dwelling unit does not trigger any requirement to provide additional parking or replace the parking that conversion displaces. Section 17.67.050(B)(11)(iii) extends the same rule to full accessory dwelling units: when a garage, carport, covered parking structure, or uncovered parking space is demolished or converted as part of building an ADU, the city does not require the parking spaces to be replaced. Outside of these ADU and JADU pathways, converting a garage in other zones to habitable space still needs a building permit from the Community Development Department, and the converted space must meet the setback, height, and building-code standards of the underlying zone.