Historic district review
Hundreds of individual landmark designations and many historic districts mean that exterior alterations — even on ordinary commercial buildings — can require a Certificate of Appropriateness before permits will issue.
California county profile
As California's only consolidated city-county, San Francisco layers historic preservation protections over most of its built environment — with hundreds of individual landmarks and more than a dozen historic districts — and the Bay shoreline is governed by a separate regional body, not the Coastal Commission.
Hundreds of individual landmark designations and many historic districts mean that exterior alterations — even on ordinary commercial buildings — can require a Certificate of Appropriateness before permits will issue.
The Bay waterfront is regulated by a regional body separate from the Coastal Commission, and projects near the Bay that assume coastal rules don't apply may still need authorization from that agency before local permits can proceed.
The city has mapped a vulnerability zone where larger capital projects must formally assess sea level rise exposure before approval — covering significant portions of the waterfront, Mission Bay, and adjacent neighborhoods.
Any tree that meets even one of the city's size criteria and is within a certain distance of the public right-of-way is protected regardless of species — and unauthorized pruning is a code violation, not just unauthorized removal.
Properties that built stormwater management improvements under the city's requirements must self-certify their maintenance every year — an ongoing obligation that transfers to new owners at sale and can come as a surprise during due diligence.
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Screen an addressSource: Headlands Environmental — environmental site screening for California. Rules summarized from publicly available county codes and planning documents; project review counts indexed from the State Clearinghouse. For authoritative requirements, consult San Francisco County directly.