Short answer
In Texas, mold projects covering 25 contiguous square feet or more fall under TDLR rules: a licensed assessor writes a protocol, a separate licensed remediator does the work, and passing projects get a Certificate of Mold Damage Remediation.Who regulates mold in Texas
The Texas Department of Licensing and Regulation (TDLR) licenses mold assessors and remediators and enforces the Texas Mold Assessment and Remediation Rules.
The 25 square foot threshold
Projects under 25 contiguous square feet of visible mold are generally exempt from licensing requirements. At or above it, licensed professionals are required, with some exemptions such as homeowners working on their own home.
Separate assessor and remediator
The same company can't be both the assessor and the remediator on the same project. This avoids a conflict of interest.
The certificate
After a regulated project passes clearance, the owner receives a Certificate of Mold Damage Remediation (CMDR). Keep it; buyers and insurers may ask for it.
Questions
Can I remove mold myself in Texas?
Homeowners working on their own single-family home are generally exempt from licensing. For large or hidden growth, hiring licensed pros protects your health and gives you documentation.
How do I check a mold license?
Use TDLR's license search on its website to confirm the assessor's and remediator's licenses.
This guide is general information for Texas homeowners, not legal, insurance or professional advice. Check your policy and local rules.