Calaveras County, CA Accessory Structures: Garage Conversions (2026)

Calaveras County treats a garage-to-living-space conversion as an accessory dwelling unit governed by Section 17.25.040 of the 2024 Zoning Code, which implements California Government Code 65852.2. Under the conversion provisions, no setback is required for an existing living area or accessory structure (such as a garage) that is converted to an ADU or part of an ADU, or for a replacement structure built in the same location and dimensions. If a junior ADU (max 500 sq ft) is created within the existing space of a single-unit dwelling, that space may include an attached garage. When enclosed or covered parking for the primary dwelling is converted or demolished to create an ADU, the code states replacement parking is not required. A garage conversion still must satisfy applicable Title 15 building code requirements, environmental-health requirements for domestic water supply and onsite wastewater (septic) systems, and fire-protection codes; properties on wells serving more than one unit must show adequate source capacity. ADU conversions are approved ministerially through the building-permit process and must be acted on within 60 days. As with all ADUs, the converted unit may not be sold separately from the primary residence and may not be used as a short-term (under-30-day) rental. Simply finishing a garage into a bedroom without creating a separate dwelling is a building-permit matter under Title 15.