(1) The maximum Floor Area Ratio (FAR) for single-family (SF) development in San Francisco typically falls under the basic FAR limits set in Section 124 of the Planning Code. For most standard residential districts (RH-1, RH-2, RH-3), the basic FAR limit is 3.6:1. There are exceptions: if a lot is nearer to an RM-4 or RC-4 District, the FAR is 4.8:1; and if it is nearer to a C-3 District, the FAR is 10.0:1.
Therefore, in most typical single-family zones, the max FAR is 3.6:1 unless your site qualifies for a higher limit as described.
(2) Confidence score: 95/100
(3) Reference clause section codes and file name:
- Section 124, Planning Code
- Tables citing FAR standards and references
- File: 2025 San Francisco CA Planning Code
(4) Original referenced articles:
“Floor Area Ratio | §§ 102, 123, 124 | Basic FAR limit is 3.6 to 1. For a lot that is nearer to an RM-4 or RC-4 District than to any other R District, the FAR is 4.8 to 1. For a lot that is nearer to a C-3 District than to any R District the FAR is 10.0 to 1…”
2025 San Francisco CA Planning Code
(5) Groundedness Check:
The answer is factually correct as it is taken directly from summary tables and clause references in the current San Francisco Planning Code. No contradictory information has been found for standard single/two-family zones, and special district exceptions are not applicable for typical SF development without a specific site context.
If you have a particular neighborhood or zoning district, mention it for more tailored FAR specifics.