San Francisco enforces the 2022 California Building Code with extensive local amendments administered by the Department of Building Inspection. The city is in Seismic Zone D with stringent seismic requirements including mandatory seismic retrofit programs. The San Francisco Building Code (SFBC) includes requirements for green building, energy efficiency, and water conservation. Permit timelines typically range from 2-8 weeks for standard projects. The city has a population of about 873,965 and requires high environmental standards for all construction. Notable requirements include Title 24 energy standards, rainwater management, and adaptive reuse incentives. Fees are typically 0.5-0.8% of construction value depending on project type.