Water damage drying
Fire & smoke cleanup
Mold remediation
Storm response
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ReconstructionFree visual inspection and a written scope of work before any mitigation begins - photos, moisture readings, and drying logs go in your claim file
The scope we write is the scope we bill. Anything new gets shown to you, in writing, before we touch it.
Get your free estimateFast, Reliable Mold Remediation Across San Francisco
Mold remediation in San Francisco typically costs between $1,800 and $6,500 for a contained area, with whole-room or multi-room jobs in older Victorians running higher because of lath-and-plaster removal and shared-wall containment. We reach most San Francisco neighborhoods within 60 to 90 minutes for an assessment, and our phones are answered by a live person at (831) 400-3496 any hour, any day. If you’ve found mold in a Sunset garage, a Noe Valley bathroom, or behind a wall in a Mission District flat, you’ll get a written price before we touch anything. That’s how we’ve worked since 2006.
San Francisco homes are not like houses anywhere else. Pre-1940 wood framing, steep hillsides, shared walls, and fog that never quite burns off in the Outer Richmond all change how mold grows and how it has to be removed. Our crews know which streets have alley-load garages with no vapor barrier, which basements flood every winter when the first real storm hits, and how to set up containment in a 1920s Edwardian without disturbing the neighbors through the wall.
Key Takeaways:
- Mold remediation in San Francisco typically runs $1,800 to $6,500 per contained area, with lath-and-plaster removal adding cost.
- In the Sunset and Richmond districts, missing vapor barriers mean even a small pipe leak can become a mold problem within 48 hours.
- Shared-wall Victorians require containment before any mold removal, or spores spread to adjacent units.
- We arrive with shoe covers, drop cloths, and a written scope of work. The price you see is the price you pay.
Why Tidemark Water Damage San Francisco Is San Francisco’s Preferred Mold Remediation Company
We’re the independently owned and operated San Francisco location of the Cedarwell Care Promise network, and we’ve built our reputation one job at a time in the city’s older housing stock. Homeowners in the Richmond, the Mission, Bernal Heights, and Glen Park call us because we treat their lath-and-plaster walls, original fir floors, and tight basement clearances like they’re our own. Shoe covers go on at the door. Drop cloths cover the floor before the first piece of equipment comes inside. Ask before we move anything.
Rick Sumner leads our San Francisco team, and he’s the kind of contractor who walks a homeowner through moisture readings, explains what the dark staining behind the baseboard actually means, and doesn’t leave until the scope of work is clear. That approach matters in a city where many houses predate 1940 and a wrong cut into a plaster wall can turn a $3,000 mold job into a $15,000 historical restoration problem. We coordinate with building managers, HOA boards, and neighbors when the job requires it, because in a shared-wall Victorian, the person on the other side of the wall is part of the job too.
Our technicians carry IICRC, RIA, and IFA credentials, and the drying equipment in our trucks comes from Dri-Eaz, Phoenix, and XPOWER. When a job wraps, we photograph the clean-up before the crew leaves so you can see exactly what was done and how the space was left. Every mold remediation we complete is backed by the 365-Day Done Right Promise. If it’s not right, we make it right.
Restoration work we handle
Mold Remediation Services in San Francisco
Mold Remediation Services in San Francisco cover the full scope: locating the moisture source, containing the affected area, removing mold-damaged materials, treating the framing, and drying the space past the tide mark. A typical San Francisco job involves containment with negative air, HEPA-filtered air movers, removal of affected drywall or plaster, antimicrobial treatment of the framing, and structural drying. Most San Francisco homeowners call us after a leak has been running behind a wall for weeks, or after a winter storm pushed water into a ground-floor bedroom.
In lath-and-plaster homes, which make up a huge share of the city’s pre-1940 building stock, mold removal is more involved than cutting out drywall. The plaster keys that hold the wall to the lath often crumble once the mold is disturbed, so removal has to be planned carefully. We map the moisture first, mark the cut lines, and protect the surrounding plaster with drop cloths and containment barriers before any demolition starts.
Containment and Air Filtration
Containment is not optional in San Francisco, especially in attached buildings. Negative air pressure keeps mold spores from drifting through doorway gaps, HVAC returns, and shared wall cavities into a neighbor’s unit. We set up sealed containment zones with HEPA-filtered air scrubbers running continuously until the affected materials are removed and the air clears.
Moisture Mapping and Root Cause
Mold is a symptom. The cause is almost always water: a failed supply line, a slow drain leak, fog-driven condensation on uninsulated pipes, or groundwater seeping through a foundation with no vapor barrier. We test moisture levels in the affected area and the surrounding framing to find the full extent before we remove anything.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Professional Mold Removal in San Francisco
Professional Mold Removal in San Francisco means removing affected materials safely, treating the structure, and documenting everything so you’re not guessing what was done. Visible mold on drywall typically means the back side of the drywall has more growth, so removal often includes cutting out the affected section, bagging it, and treating the cavity. In bathrooms with chronic fog condensation, we frequently remove the lower sections of drywall behind the vanity and treat the framing with antimicrobial before rebuilding.
San Francisco’s dense housing stock creates a specific challenge we handle every week: tight spaces. Basements in the Richmond and Sunset often have low clearance, narrow doorways, and no room for large drying equipment to sit comfortably. We use compact air movers and low-profile dehumidifiers from Dri-Eaz to dry these spaces properly without turning your basement into an equipment warehouse. Where pet-safe drying agents are an option, we use them.
Lath-and-Plaster Mold Removal
Removing mold from lath-and-plaster walls takes patience and care. The plaster is often 3/4 inch thick and bonded to wood lath that may be 100 years old. We score and remove the affected plaster in controlled sections, leaving the lath intact where structurally sound, and treat the framing behind it. The goal is to remove every affected material while preserving as much of the original wall as possible.
Black Mold and Heavy Growth
Black mold, technically Stachybotrys chartarum, grows where water has been present for extended periods, often behind walls or under flooring in homes with chronic moisture. We treat it with the same process as any other mold remediation: full containment, controlled removal, antimicrobial treatment, and verification drying. Our crews have the credentials and experience to handle heavy growth safely.
Trusted Brands We Service in San Francisco
We service and maintain mold remediation equipment from the brands San Francisco contractors and homeowners already trust: Dri-Eaz dehumidifiers, Phoenix air movers, and XPOWER compact fans. Our trucks carry replacement filters, HEPA bags, and containment materials for these systems, which means faster turnaround when a job in the Outer Richmond or Potrero Hill requires a specific replacement part. If your property already has drying equipment from these brands on site, our technicians can assess, service, and integrate it into the remediation plan.
Common Mold Remediation Problems We See in San Francisco Homes
- Shared-wall spread in Victorians. In attached Victorians and Edwardians, mold in a bathroom wall can travel through the wall cavity into the adjacent unit’s framing within days, often because the leak that started it has been running for weeks.
- Ground floors with no vapor barrier. In the Sunset and Richmond, many garages and ground-floor rooms sit on concrete with no vapor barrier, so even a minor pipe leak or storm runoff raises moisture levels enough to trigger mold growth and chronic dry rot in sill plates.
- Fog-driven condensation. Fog in the western neighborhoods means uninsulated cold-water pipes sweat, condensation runs down inside walls, and mold grows where no leak ever occurred. This type of moisture is constant, so remediation has to include a control plan for the condensation source.
- Basement accessibility. Tight basements with low ceilings and narrow stairs make containment and drying harder, and some San Francisco contractors skip proper containment to save time. Skipping it spreads spores through the whole building, and we see the result of that shortcut on follow-up calls all over the city.
See the difference
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AfterPricing for Mold Remediation in San Francisco, CA
In San Francisco, a contained mold remediation job on one room or a section of a wall typically runs $1,800 to $4,200. A bathroom with mold behind the shower surround and wet framing starts around $2,800. A basement with mold across multiple walls and moisture in the sill plates generally falls between $4,500 and $8,000. Lath-and-plaster removal adds $3 to $6 per square foot depending on how much original wall has to come out and how carefully the surrounding plaster must be preserved.
What changes the price: square footage of affected material, whether the mold is in one wall cavity or multiple rooms, whether the home has lath-and-plaster or drywall, whether the moisture source is still active, and whether the building is attached to neighbors who require coordination. You’ll see the full written price before we start. No numbers appear on the final invoice that were not on the first one. For a free estimate, call (831) 400-3496.
We Also Serve Cities Near San Francisco
Our San Francisco crews work throughout San Francisco, and we serve Daly City, South San Francisco, Alameda, and Berkeley for mold remediation projects that need the same written-price-first approach and local housing expertise. Every job, in every one of these cities, gets the same 365-Day Done Right Promise and the same shoe-covers-at-the-door standard. If you’re in a shared-wall building with mold in Daly City or a Berkeley hillside home with crawl space moisture, call (831) 400-3496.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the San Francisco area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Mold Remediation in San Francisco
In a San Francisco ground-floor room with no vapor barrier, mold growth on wet drywall can begin within 24 to 48 hours, especially in the Sunset and Richmond districts where the fog keeps ambient humidity high year-round. The concrete slab wicks moisture upward, and without a vapor barrier the drywall absorbs it continuously. That’s why we recommend an inspection within 24 hours of any standing water or visible leak in these homes. Call (831) 400-3496 and we’ll assess the source and the spread.
Yes, and this is one of the most common problems we see in San Francisco’s attached Victorians and Edwardians. Wall cavities in shared-wall buildings often span the property line, so mold in your bathroom wall can extend into your neighbor’s framing without anyone seeing it. Proper containment with negative air pressure during remediation is the only reliable way to prevent cross-unit contamination. We coordinate with the building manager and, when needed, the neighbor directly.
Mold remediation in a lath-and-plaster wall involves moisture mapping to define the affected area, setting up containment, scoring and removing the plaster in controlled sections, removing mold-damaged lath where it’s compromised, treating the framing with antimicrobial, and drying the cavity with compact equipment. In San Francisco’s pre-1940 homes, we typically use low-profile Dri-Eaz dehumidifiers that fit tight basements and small rooms. The work is documented with photos and moisture readings before the wall is rebuilt.
Most of the time, yes. In a tight San Francisco basement with low clearance and narrow access, a full pack-out of contents often isn’t necessary if the affected area can be isolated with containment and the contents are moved a few feet away under plastic. Our crews use compact air movers and low-profile dehumidifiers that fit spaces where standard drying equipment won’t. We’ll tell you before the job starts whether a pack-out is needed, based on the square footage and the layout.
You fix the moisture source, not just the mold. In foggy neighborhoods like the Outer Sunset, Outer Richmond, and Ingleside, that often means adding a vapor barrier to a ground-floor slab, insulating cold-water pipes against condensation, improving subfloor ventilation, or installing a dehumidifier for chronically damp basements. Our remediation plans include specific recommendations for moisture control so the mold doesn’t return six months later. Every job is covered by the 365-Day Done Right Promise.
Call Tidemark Water Damage San Francisco for Mold Remediation
If you’re dealing with mold in San Francisco, call (831) 400-3496. You’ll speak with a live person who can schedule an assessment, answer questions about containment and pricing, and walk you through what happens next. We serve the entire city, from the Richmond and Sunset to the Mission, Potrero Hill, Bernal Heights, and every neighborhood in between. Written price first. Shoe covers at the door. A photo of the clean-up before we leave. That’s the standard, and it has been since 2006.
Written by Rick Sumner, Owner at Tidemark Water Damage San Francisco, serving San Francisco and the surrounding Bay Area.