Can I convert my existing garage to an ADU?

Yes, existing accessory structures can be converted to an ADU.  Some important considerations to keep in mind are: 

  1. Fire separation requirements per R302.
  2. Structural adequacy of existing structure. If existing structural members are subjected to increased loads, structural retrofit may be required. (Example: The ceiling joists for an existing garage may have been sized without considering the additional weight of drywall, mechanical units, etc.) 
  3. A vapor retarder is required per R506.2.3. If one was not installed during construction of an existing slab, a post installed product may be used. If installing a post installed vapor barrier, Placer County requires that an alternate materials request form be submitted along with product specifications. Requests will be reviewed on a case by-case basis. Placer County is currently working on providing a list of pre-approved products that can be used as a post installed vapor barrier.

Show All Answers

1. Can a portion of an existing house, garage or other accessory structure be converted to an Accessory Home?
2. Can an Accessory Home be constructed above or attached to a garage?
3. How close can an ADU be to a property line or adjacent building?
4. Are automatic sprinklers required in my ADU?
5. Can I convert my existing garage to an ADU?
6. What kind of egress requirements apply to my ADU?
7. Can a single HVAC system be installed to serve both the primary dwelling and attached ADU?
8. Does my ADU require separate utility meters?
9. Does my ADU require solar?
10. Does my project need to comply with Wildland Urban Interface requirements?