Mold Remediation in San Antonio, TX

On a licensed Texas job, the contractor works from a consultant's written protocol: what comes out, where, how it is cleaned, and what has to be true at the end. The crew seals the area with plastic, runs air scrubbers under negative pressure, removes what cannot be cleaned, HEPA-vacuums the rest, and dries before anything is rebuilt.

Older homes near downtown

Monte Vista, Tobin Hill, and King William have many pier-and-beam houses. Under them, a slow drain leak or poor ventilation can wet insulation and stain joists and subfloor for months before anyone notices upstairs. Crawl space remediation means removing the wet insulation, cleaning or replacing affected wood, and fixing the moisture source, often a plumbing repair plus drainage or a ground vapor barrier. Exterior changes in historic districts may need city review, so ask before any siding or window work. Our guides to crawl space mold and subfloor mold go deeper.

Newer slab homes

On the north and west sides, most homes sit on slabs. A slab leak or a failed water heater usually shows up as damp flooring or dark baseboards. The plumber repairs the line first; then the crew removes wet baseboards, lower drywall, and flooring along the leak path and dries the slab.

Storm and flash-flood jobs

San Antonio averages about 32 inches of rain a year (NOAA), but much of it arrives in bursts. The wettest day on record brought 11.26 inches on October 17, 1998, and September 2018 brought 16.86 inches in a month. Rising water through a door means flood cuts, flooring out, and full drying; a roof opened by wind or hail means ceilings, attic insulation, and decking.

Drying in San Antonio humidity

Average relative humidity is about 67%, and mornings typically reach the low 80s. A soaked cavity or crawl space can stay damp for days, so drying relies on dehumidifiers and readings, not on open windows. Walls should not be closed until the protocol's moisture targets are met.

Texas rules that protect you

• A licensed contractor is required once growth covers 25 contiguous square feet; since September 1, 2025, crew members doing hands-on work must also be licensed or registered with TDLR.
• The consultant who writes the protocol cannot do the removal on the same project. Get yours from an independent mold inspection in San Antonio.
• Expect the Consumer Mold Information Sheet before work, a passed clearance after, and the Certificate of Mold Damage Remediation within 10 days.
• Owners of residential property with fewer than 10 units may do their own work without a license.

What it costs

A 2026 San Antonio estimate puts remediation at about $9 to $43 per square foot, a wide range that reflects how different a bathroom ceiling is from a full crawl space. National homeowner data puts most jobs at about $1,150 to $3,400 and extensive growth up to about $20,000. Clearance is billed separately; local 2026 guides put it at about $150 to $400, and mold testing in San Antonio explains that step. See the mold remediation cost guide.

When you call

Say whether the house is pier-and-beam or slab and what got wet. The local company you are connected with will tell you whether you need an assessment first and what the next visit costs. The call is free.

Remediation of 25 contiguous square feet or more in Texas requires a TDLR-licensed contractor, and since September 2025 the crew must be licensed or registered too. Check every license at tdlr.texas.gov.