Do ADUs count toward floor area and building coverage limits?

Yes. However, for ADUs proposed with a single-family residence, or on a lot with an existing single-family residence, a new ADU that is 800 square feet or smaller in size may exceed the floor area limit and building coverage limits by up to 800 square feet if built after or concurrently with the primary dwelling unit. Additions to the area of existing ADUs may not exceed the limits for the lot that they were built on, nor can additions to the primary dwelling unrelated to the ADU exceed the limits. Please review the SF ADU webpage for additional information. New ADUs on properties with existing multi-family buildings may also exceed the floor area ratio by the gross floor area of the ADU(s). Please review the MF ADU webpage for additional information. Please review the Zoning Ordinance for the definitions of floor area, building coverage and gross floor area.

Show All Answers

1. Which properties qualify as a lot with a single-family residence?
2. Which properties qualify as a lot with an existing multi family building?
3. Do ADUs count toward floor area and building coverage limits?
4. Is an ADU an accessory building?
5. Can I convert an existing accesory building into an ADU?
6. Can I convert my attached garage/carport into an ADU?
7. Do I need to provide parking for my ADU?
8. Can I rent out my ADU?
9. Is there a daylight plane requirement for ADUs?
10. Will my property taxes increase with an ADU?