MoldHelpUSAWhat mold remediation includes
- A written scope listing rooms, materials, containment, and building access
- Containment that protects shared halls, stairs, and neighboring units
- Lead-safe work practices where pre-1978 paint is disturbed
- Careful removal around plaster, original trim, and wood sash
- Drying of framing behind ground-floor and hillside walls
- A final check by someone other than the crew
Mold Remediation in San Francisco: local factors
About 77% of San Francisco homes were built before 1980, and roughly 45% before 1940 (Census ACS), the oldest housing of any city on this site. That changes the work: walls are often plaster on wood lath, windows are original sash, paint layers go back decades, and many buildings hold more than one household.
Fog-side bedrooms and closets
In the Outer Sunset and the Outer Richmond, summer fog keeps the ocean-facing walls cool for weeks. Warm indoor air meets those walls and the windows set in them, and growth appears in corners, behind furniture, and in closets built against the outside wall. Most of these jobs are modest: clean or remove the affected finishes, then add heat, airflow, a bath fan that vents outdoors, or a dehumidifier. Our window sill guide covers the smallest cases.
Plaster, lath, and old paint
Plaster that is sound with surface growth can often be cleaned. Plaster that stayed wet and crumbles, or growth on the lath behind it, means that section comes out, and cutting plaster makes far more dust than cutting drywall. In homes built before 1978, the EPA's lead Renovation, Repair and Painting rule requires a certified firm and lead-safe practices when more than about 6 square feet of painted surface in a room is disturbed. Ask whether the crew holds that certification.
Ground-floor rooms and garages
Many houses on the city's slopes have a garage and an in-law room at street level, partly set into the hill. Water moves through the foundation wall on the uphill side, and storms like the one on New Year's Eve 2022 push water into low garages. Remediation removes wet drywall and flooring at the base, dries the framing and the sill, and lasts only if the drainage outside is fixed too.
Condos, TICs, and flats
In a building shared by several households, the scope has to say how the work area is sealed, how air is filtered, which route debris takes through common areas, and which parts belong to the building rather than to you. Management or the HOA may require insurance certificates before the crew arrives.
License and permits
California does not license mold removal. Check the company's CSLB license, which any job of $1,000 or more needs, along with any job that requires a permit. Window, siding, framing, and some plaster repairs in older buildings can need a permit from the Department of Building Inspection. An independent mold inspection in San Francisco sets the scope before anyone opens a wall.
What it costs
No San Francisco survey we trust exists, so HomeGuide's national figure of about $1,100 to $3,400 for a typical job is the starting point. Old buildings push it up: plaster and original trim take longer, containment in shared buildings adds hours, and lead-safe work adds steps. See the remediation cost guide and mold testing in San Francisco for the final check.
On the call
Say what kind of building it is, which side of the house the mold is on, and whether other units share the wall. The local company you reach will explain the next step and its price, at no cost for the call.
Mold Remediation cost in San Francisco
| Job | Typical range |
|---|---|
| Typical remediation job (national, HomeGuide) | $1,100–$3,400 |
| Inspection to scope the work (national, Angi) | $300–$1,000 |
Licensing for mold remediation in San Francisco
There is no California mold license. Check the CSLB license, ask whether the crew is EPA lead-safe certified for pre-1978 homes, and ask whether DBI needs to permit any repairs.