Water damage drying
Fire & smoke cleanup
Mold remediation
Storm response
Sewage cleanup
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 Fresno
Mold remediation in Fresno usually costs between $1,200 and $4,800 for a typical bathroom or under-sink job, and $4,000 to $12,000 for a full slab-leak or crawl space scope. Those are real numbers for this market, not national averages. The work often takes two to five days from initial assessment to final air clearance. If you’re seeing dark staining on baseboards, smelling something musty that won’t air out, or noticing paint bubbling on an interior wall, call (559) 354-1680. We answer live, every hour, and we’ll tell you straight whether you need remediation or just a dehumidifier and a good cleaning.
Why Tidemark Water Damage Fresno Is Fresno’s Preferred Mold Remediation Company
Most Fresno mold problems trace back to water you never saw. That’s the part national franchises miss when they fly a tech in from out of town. Our crews live here and work here. We know that the 1950s ranch on Ashlan Avenue has the same under-slab galvanized supply lines as the one on Fruit Avenue, and that the expansive clay soil under southeast Fresno cracks cast-iron drain lines in predictable ways. Rick Sumner, who leads our Fresno team, has spent years mapping those failure patterns across neighborhoods from Woodward Park to Sunnyside to Tower District.
Every job starts with a written price before any equipment comes off the truck. Not an estimate range. A written number. Shoe covers go on at the door. Drop cloths cover the floor before the first air mover is placed. When the job is done, we photograph the clean-up and hand you the picture. If anything isn’t done right, the 365-Day Done Right Promise means we come back and make it right. No fine print, no argument.
Restoration work we handle
Bathroom Mold Removal in Fresno
Bathroom Mold Removal in Fresno typically runs $800 to $2,500 for a standard 5×8 bathroom when mold is contained to drywall, baseboards, and the vanity wall cavity. Older Fresno ranch homes often hide the real problem behind the tile: a slow weep from a corroded galvanized supply line inside the wall, or condensation trapped by a poorly vented exhaust fan. Fixing the visible mold without finding the moisture source guarantees the mold comes back in six months.
Wall Cavity Containment
Fresno’s tight mid-century floor plans recirculate air through return vents close to the bathrooms. Before we open any wall, we seal the return-air vents and set up negative-air containment. That keeps spores from moving into the hallway carpet or the kids’ bedroom while we remove affected drywall and treat the framing.
Ventilation Correction
A bathroom fan that vents into the attic instead of outside is common in 1960s and 1970s Fresno homes. It’s a mold engine. We check the vent run and, where needed, adjust the fan or the ducting so moisture actually leaves the house. The mold removal only holds if the air physics are right.
Mold Removal Service in Fresno
Mold Removal Service in Fresno involving under-slab leaks or crawl space saturation generally costs $4,000 to $12,000 depending on square footage and how far the moisture migrated. These are the jobs where Fresno’s expansive clay soil is often the culprit: the ground shifts, cast-iron drain lines crack, and water seeps under the slab for months before flooring starts to buckle. By the time you see the damage, the mold has been active for a while.
Slab Leak Detection and Drying
Our Mold Remediation team uses Dri-Eaz infrared cameras and penetrating moisture meters to map saturation under slabs without ripping up floors on a guess. In a 1962 ranch on East Gettysburg Avenue near Sunnyside last July, a corroded galvanized line under the hallway slab had been weeping for months. Because the leak was Category 1 clean water, we dried much of the structure in place using Phoenix axial air movers and Injectidry floor mat systems after applying an EPA-registered antimicrobial treatment. The homeowner kept their original oak floors.
Crawl Space Treatment
Fresno’s dry summers make crawl spaces feel dry to the hand even when humidity at the subfloor stays above 60 percent. We use dehumidification equipment from Dri-Eaz and B-Air to pull moisture out of wood framing, then seal or replace the vapor barrier. If the crawl space stays damp, mold under the house becomes a continuous spore source for the living space above.
Trusted Brands We Service in Fresno
We run Dri-Eaz and Phoenix drying equipment on Fresno jobs because these machines hold up to 100°F-plus ambient heat without losing efficiency. XPOWER air movers are our workhorse for tight bathroom containment, and B-Air units handle wide-open ranch house rooms with good airflow. We also service homes with Injectidry mat systems already in place and stock common parts locally, so a Fresno job rarely waits on a shipment from out of state. If your previous restoration contractor used one of these brands, we can step in and keep the equipment working rather than starting from scratch.
See the difference
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AfterCommon Mold Remediation Problems We See in Fresno Homes
- Under-slab galvanized pipe corrosion: Fresno’s expansive clay soil shifts with moisture changes, stressing 60-year-old galvanized supply lines under slab homes. A pinhole leak that weeps for months feeds mold you can’t see until baseboards darken or flooring cups.
- Surface dryness hiding active growth: When summer temperatures hit 105°F, drywall and baseboards feel bone dry within hours of a leak. But moisture behind the wall cavity and under the slab stays elevated. Without structural drying and dehumidification, mold keeps growing where you can’t see it.
- Recirculating spores in mid-century floor plans: Older Fresno ranch homes share return-air plenums between bedrooms and bathrooms. Demolition without containment spreads spores into the HVAC system and every room on the same trunk line. We seal returns and run negative air before any tear-out.
- Detached workshop and converted garage mold: Many Fresno homes on acreage have outbuildings or converted garages that were never vented properly. Concrete slab moisture wicks up through the floor, and mold grows behind stored materials and on the underside of drywall ceilings. These spaces need vapor barrier correction, not just surface cleaning.
Pricing for Mold Remediation in Fresno, CA
Here are honest Fresno market ranges. Bathroom mold removal: $800 to $2,500. Single-room containment with drywall replacement: $1,800 to $4,500. Crawl space treatment with vapor barrier: $2,500 to $7,000. Slab leak remediation with structural drying: $4,000 to $12,000. What moves the number is square footage, how far water migrated, and whether finished materials like tile or hardwood need removal and replacement. You get a written price before any work starts, every time. Call (559) 354-1680 for a free assessment. We serve Fresno from our Central Valley office without tacking on travel fees.
We Also Serve Cities Near Fresno
Our crews regularly work Clovis, Madera, Sanger, and Fowler for mold remediation jobs that start with a Fresno-diagnosed problem. Whether it’s a ranch home on a slab in Clovis or an older farmhouse outside Fowler with a damp crawl space, the same written-price rule and the same 365-Day Done Right Promise apply. Call (559) 354-1680 and we’ll tell you straight what the job needs.
Serving Fresno, CA - Our Local Coverage Area
We’re based in the Fresno 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 Fresno
Fresno’s hard water accelerates mineral scale inside 1950s to 1970s galvanized pipes, and over decades the scale traps moisture against the interior wall and the zinc coating breaks down. The pipe rusts from the inside out, then develops pinhole leaks. Because these lines often run under slab foundations, the leak goes unnoticed while the soil beneath the house stays damp and mold colonizes under flooring and behind baseboards. If your home has original galvanized supply lines, a moisture assessment is cheap insurance. Call (559) 354-1680 and we’ll help you decide if it’s worth investigating.
Yes, you should check for mold even if the surface dried quickly. Fresno’s winter rains are brief but intense, and a roof leak that soaks ceiling drywall or attic insulation for even six hours can support mold growth inside the cavity. The hot attic air may dry the visible surface fast, but insulation holds moisture for days. If the leak hit a ceiling near a bathroom or kitchen, the humidity load is worse. A quick inspection with a moisture meter costs less than a ceiling replacement later.
Because the fan is usually venting into the attic or the run is too long and underpowered for the duct size. In older Fresno ranch homes, we find bathroom exhaust fans ducted into the attic space more often than not. The moist air hits hot attic surfaces, condenses, and soaks the insulation. The mold in the bathroom ceiling keeps coming back because the moisture never actually leaves the house. Correcting the vent run to the exterior is often the difference between a one-time remediation and a repeat call every spring.
Category 3 water is grossly contaminated, meaning it contains sewage, bacteria, or chemical runoff. In Fresno, sewer backups under slab homes often come from cracked cast-iron drain lines caused by expansive clay soil movement. Materials saturated with Category 3 water, like drywall, carpet pad, and baseboards, cannot be dried and saved. They’re removed, bagged, and disposed of under containment. The affected area is then cleaned, disinfected, and dried before rebuild. Skipping that step leaves pathogens in the structure. Call us at (559) 354-1680 and we’ll assess whether your backup is Category 1, 2, or 3 before any work begins.
We treat it as a separate structure with its own moisture profile. Detached workshops and converted garages in Fresno often sit on concrete slabs with no vapor barrier underneath. Ground moisture wicks up, and if the building is closed up most of the day, humidity stays high enough to support mold on stored materials, drywall, and wood framing. We run moisture readings, install or repair the vapor barrier where accessible, and set up drying equipment sized for the space. The mold itself is treated with an EPA-registered antimicrobial, and we photograph everything before we leave.
If you suspect mold anywhere in your Fresno home, call (559) 354-1680. A real person answers. We’ll schedule a free assessment, give you a written price before any work begins, and treat your home the way we’d want ours treated.
Written by Rick Sumner, Owner at Tidemark Water Damage Fresno, serving the Central Valley since 2006.