Minimum size of a room of ADU in San Francisco

For Accessory Dwelling Units (ADUs) in San Francisco, the Planning Code does not impose any minimum size for an individual room within the ADU. The Code is clear that the City cannot require any minimum or maximum overall size for an ADU that would prevent the construction of an ADU up to 800 square feet in gross floor area, provided all other requirements are met. There is no clause specifying a minimum square footage for rooms within ADUs, only maximum square footages for total ADU size applicable in some circumstances.

S. N.•7 months ago
Minimum size of a room of ADU in San Francisco

  1. Answer: For Accessory Dwelling Units (ADUs) in San Francisco, the Planning Code does not impose any minimum size for an individual room within the ADU. The Code is clear that the City cannot require any minimum or maximum overall size for an ADU that would prevent the construction of an ADU up to 800 square feet in gross floor area, provided all other requirements are met. There is no clause specifying a minimum square footage for rooms within ADUs, only maximum square footages for total ADU size applicable in some circumstances. Likewise, Junior ADUs (JADUs) are limited to a maximum of 500 square feet but have no stated minimum room size.

  2. Confidence Score: 95/100

  3. Reference Clause Section Codes and File Name:

  • Section 207.2(e), "2025 San Francisco CA Planning Code"
  1. Original Referenced Articles in Blockquote:

...the City shall not impose any requirement for a zoning clearance or separate zoning review, any minimum or maximum size for an ADU, any size based upon a percentage of the proposed or existing primary dwelling, or any limits on lot coverage, floor area ratio, open space, front setbacks, and minimum lot size, for either attached or detached dwellings, that does not permit construction of an ADU meeting all other requirements that is 800 square feet or less in Gross Floor Area, 16 feet or less in height, and with four foot side and rear yard setbacks....

And for Junior ADUs:

A Dwelling Unit that meets all the requirements of Section 207.2, and that: (a) is accessory to at least one other Dwelling Unit on the same lot; (b) is no more than 500 square feet of Gross Floor Area; (c) is contained entirely within an existing or proposed single-family structure;....

  1. Groundedness Check: The answer is factually correct based on the cited section of the San Francisco Planning Code. The code specifically prohibits imposing a minimum room or ADU size that would prevent construction of an ADU up to 800 square feet. No separate room size minimum is required or mentioned. This reflects compliance with State ADU law as well.