What the Threshold Does
Texas mold rules use 25 contiguous square feet as the dividing line. Below it, a property owner may hire any contractor to perform the work. At or above it, remediation must be performed by a TDLR-licensed mold remediation contractor.
The threshold also drives notification. Licensed remediation projects require notice to TDLR at least five days before work begins. Projects under the threshold carry no such requirement.
What Contiguous Means
Contiguous refers to a connected affected area, not the total across a property. Three separate two-square-foot patches in different rooms are not the same as one twenty-five square foot area.
This is where owners get it wrong in both directions — some assume any mold requires a licensed contractor, others measure only the visible staining while the affected material extends well beyond it.
Measure the Affected Material, Not the Stain
Visible growth is usually smaller than the affected area. Moisture wicks through drywall, insulation, and framing beyond where discoloration appears, and growth on the back side of a wall cavity is invisible from the room.
This is a practical reason to have an assessment before assuming a job is small. A patch that looks like four square feet on the surface frequently opens up into something well past the threshold.
Why the Threshold Matters to You
- Documentation. Licensed projects generate a protocol, a clearance evaluation, and a Certificate of Mold Remediation — the paperwork sellers must provide buyers for five years
- Insurance. Carriers frequently require licensed work for claims to be honored
- Real estate. Unlicensed work on a large area leaves you with a disclosed mold history and no credible documentation
- Liability. For landlords and commercial owners, using an unlicensed contractor above the threshold is a fact that surfaces badly in litigation
When You Are Genuinely Under the Threshold
Small isolated growth — bathroom ceiling spotting, a patch of window sill mildew — is often legitimately a cleaning task. Texas does not require a licensed contractor for it.
The caution is that small visible mold is sometimes the edge of something larger. If there is any history of leaking, flooding, or persistent odor, the visible patch is probably not the whole story.
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