How Much Mold Requires a Licensed Professional in Texas?

In Texas, mold remediation work covering more than 25 contiguous square feet of contamination generally requires a licensed mold assessor and a licensed mold remediation contractor under Texas Occupations Code Chapter 1958. Below that threshold, the job is typically considered small-scale and may not require a state license, though homeowners should still address the underlying moisture problem. This 25-square-foot rule is the legal trigger — separate from health-based guidance from the EPA, which uses a smaller 10-square-foot benchmark for when a professional may be advisable.

Understanding which side of that line your mold problem falls on determines whether you can legally clean it up yourself, hire an informal handyman, or must bring in a state-licensed mold professional under the Texas Department of Licensing and Regulation (TDLR) program.

What is the 25-square-foot rule in Texas mold law?

The Texas Mold Assessment and Remediation Rules (TMARR), authorized under Texas Occupations Code Chapter 1958, set the licensing trigger at more than 25 contiguous square feet of mold-contaminated material. If the contaminated area — measured as a single continuous patch, not scattered spots added together — exceeds that size, the project must be handled by:

• A licensed mold assessment consultant or technician, who inspects the property, collects samples if needed, and writes a remediation protocol
• A licensed mold remediation contractor, who performs the physical cleanup according to that written protocol

Projects at or under 25 square feet generally fall outside mandatory state licensing, meaning a homeowner or an unlicensed handyman can technically perform the work. That said,