Mold Removal in Houston, TX: What to Know in 2026
Houston has a mold problem. The city's Gulf Coast location means outdoor humidity sits between 75% and 90% for most of the year, well above the EPA's recommended indoor ceiling of 60%. With hurricane-season flooding, aging HVAC systems, and over 50 inches of annual rainfall, mold removal is among the most common home repair needs in the region.
Why Houston homes are especially vulnerable
Humidity alone doesn't cause mold, but it creates conditions where any moisture event can turn into an infestation fast. A small roof leak after a summer storm, a slow condensate drain on a central AC unit, or floodwater that sat for more than 48 hours can all trigger growth within a day or two.
Hurricane season runs from June through October and brings the highest risk. Even homes that avoid direct flooding often take on moisture through wind-driven rain, roof penetrations, or overwhelmed drainage around foundations. After Hurricane Harvey, mold remediation demand across the Houston metro surged as homes that appeared structurally intact were found to have hidden growth inside walls and under flooring.
HVAC systems are another common source. Units running nearly year-round accumulate condensation in air handlers and drain pans. When drain lines clog, as they regularly do in Texas homes, water backs up and soaks insulation and drywall around the unit. A musty smell when the AC runs is often the first sign.
Texas licensing: what to know before you hire
Texas has stronger mold contractor regulations than most states. The Texas Department of Licensing and Regulation (TDLR) requires separate licenses for mold assessment consultants and mold remediation contractors. The same company cannot perform both the inspection and the removal on the same property. This separates the diagnosing company from the one that profits from the cleanup.
When you hire an independent mold assessor first, you get an unbiased report and a written remediation protocol. You can then use that protocol to get competitive bids from separate remediation contractors. Any company that offers to inspect and remediate in the same visit, or pressures you into same-day contracts, is not operating within the TDLR framework.
To verify a contractor's license, search the TDLR license lookup by company name or license number. TDLR also requires contractors to carry at least $1 million per occurrence in general liability insurance.
What mold removal costs in Houston
Most Houston projects fall in the $1,500 to $9,000 range, consistent with national averages. Jobs here often run toward the higher end. Houston's humidity means problems are frequently more extensive by the time they're found. Mold that's been growing behind a wall through a wet summer can cover far more surface area than an equivalent leak in a drier climate.
For a detailed breakdown by square footage, material type, and HVAC involvement, see our mold removal cost guide.
If the mold resulted from a sudden covered event — a burst pipe, storm damage, or an appliance failure — your homeowners policy may cover some or all of the remediation cost. Hurricane flooding is almost always excluded unless you have separate flood insurance. Document the moisture source thoroughly before calling your insurer, and don't start remediation until the adjuster has inspected. For the full picture on what policies cover and what they don't, see does homeowners insurance cover mold remediation.
Factors that push Houston projects higher:
- Crawl space or pier-and-beam remediation (common in older Houston neighborhoods)
- HVAC duct cleaning and air handler replacement
- Post-hurricane remediation involving Category 3 (sewage-contaminated) water
- Post-remediation clearance testing, which is billed separately
Do you need a professional, or can you handle it yourself?
The EPA's threshold is 10 square feet — roughly a 3×3 foot patch. Below that, on a non-porous surface like tile, DIY cleanup with proper PPE is reasonable. Above it, or anywhere mold is inside walls, under flooring, or in your HVAC system, professional remediation is the right call. Houston's humidity also means what looks like a small surface patch is often the visible tip of a larger hidden problem. If you're unsure, DIY vs. professional mold removal lays out the decision clearly.
What to look for in a Houston mold contractor
Beyond TDLR licensing, look for IICRC AMRT certification (Applied Microbial Remediation Technician). The IICRC is the industry's primary certification body for mold remediation. You can verify any contractor's certification status directly at iicrc.org.
A few questions worth asking before you sign anything:
- Can you show me your current TDLR license number?
- Will a separate, independent assessor write the remediation protocol, or does your company do both?
- What does post-remediation clearance testing include, and who performs it?
- Do you carry at least $1 million in general liability insurance?
For a full list, see 15 questions to ask a mold removal company.
Find verified contractors in Houston
Find verified mold removal companies in Houston with TDLR license status, IICRC certifications, and customer reviews.