Storm Damage Repair in San Francisco, CA

San Francisco's storm damage is dominated by the atmospheric river events that arrive from the Pacific between November and March, but the city's unique topography and built environment shape how that damage manifests. The Marine Headlands funnel wind through the Golden Gate, and neighborhoods on the city's windward (western) face — Outer Sunset, Inner Sunset, and the Richmond — experience wind-driven rain intrusion that overwhelms even modern window seals. Victorian and Edwardian flat roofs — a hallmark of San Francisco's architectural identity — were not designed for atmospheric river rainfall rates and require meticulous membrane maintenance to prevent the water infiltration through parapet walls that defines their failure mode. The 2023 atmospheric river sequence caused roof failures across hundreds of San Francisco buildings, triggering permit-required emergency repairs that revealed decades of deferred maintenance. San Francisco's strict historic preservation district regulations require that storm damage repairs use period-appropriate materials and finishes, adding time and cost to every project in landmark-designated neighborhoods.