San Francisco, CA Building Setbacks & Zoning: Lot Coverage Limits (2026)

Lot Coverage in C Districts. Lot coverage is limited to 80% at all levels containing residential uses, except that on levels that include only lobbies and circulation areas and on levels in which all residential uses, including circulation areas, are within 40 horizontal feet from a property line fronting a street or alley, up to 100% lot coverage may occur. The unbuilt portion of the lot shall be open to the sky except for those obstructions permitted in yards pursuant to subsections (1) through (23) of Section 136(c). Where the adjacent properties have an existing rear yard, the unbuilt area of the new project shall be designed to adjoin that rear yard. In accordance with Section 210.5, lot coverage requirements shall not be applicable for Commercial to Residential Adaptive Reuse projects.

(e)   Permitted Obstructions. Only those obstructions specified in Section 136 of this Code shall be permitted in a required rear yard, and no other obstruction shall be constructed, placed, or maintained within any such yard. No motor vehicle, trailer, boat, or other vehicle shall be parked or stored within any such yard, except as specified in Section 136.

(f)   Second Building on Corner Lots and Through Lots in RH, RTO, RM-1, and RM-2 Districts. Where a lot is a Corner Lot, or is a through lot having both its front and its rear lot line along Streets, Alleys, or a Street and an Alley, the subject lot may have two buildings, each fronting at one end of the