Mold Inspection & Remediation in San Francisco, CA

Downtown San Francisco averages about 23 inches of precipitation a year under NOAA's 1991–2020 normals, nearly all of it from November through March. Big winter storms test the city's old roofs, bay windows, and siding. On December 31, 2022, downtown recorded 5.46 inches in a single day, the second-wettest day in the city's records, and streets and low-lying garages flooded across the city.

The housing makes it harder. About 77% of San Francisco's homes were built before 1980, and about 45% before 1940, according to the Census Bureau, the oldest housing stock of any city we cover. Victorians and Edwardians have plaster walls, wood windows, and ground-floor garages and in-law units set into hillsides. Out in the Sunset and the Richmond, summer fog keeps walls and windows cool and damp for long stretches, and bedrooms, closets, and bathrooms on the ocean side are where condensation mold tends to show up.

In a city this damp and this old, the EPA's advice to dry wet materials within a day or two is the difference between a cleanup and a remediation job.

These are national figures, Angi for inspections and HomeGuide for lab samples and typical jobs, because we have not found a San Francisco mold price survey we trust. Older buildings push costs up: plaster, original trim, and tight ground-floor units take longer to contain and repair, and work in multi-unit buildings often needs coordination with neighbors. See the remediation cost guide.

San Francisco homeowners have no state mold license to look up. The useful checks are the CSLB contractor license and the city permit. Repairs to plaster, framing, siding, or windows in an older building often need a permit from the Department of Building Inspection, and permitted work requires a licensed contractor no matter how small the job; anything of $1,000 or more requires one regardless.

In multi-unit buildings, ask how the crew will keep dust out of shared hallways and neighboring units, and whether the building's management needs proof of insurance first. A written scope should list rooms, materials, containment, and how the result will be checked. See the California page.

For San Francisco homes, insurers often look hard at whether mold came from a sudden event or from years of damp. Rain that came through a roof or window damaged in a storm, or a pipe that burst, is the case a homeowners policy is most likely to cover, with mold paid up to a separate limit. Condensation mold in a foggy west-side bedroom or a slow leak through old siding is commonly treated as maintenance and excluded.

In condos and multi-unit buildings, the building's master policy and your own policy may split the cost depending on where the water started. Photograph damage before cleanup and report it promptly. The California Department of Insurance takes complaints. See does insurance cover mold.