What Texas requires for mold removal in Lewisville: a licensed remediator at 25 square feet or more, working to a separate assessor's plan.
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In Texas, mold remediation covering 25 contiguous square feet or more must be done by a TDLR-licensed remediator, working from a plan written by a separate licensed assessor. Smaller areas may not need a license. The law keeps assessing and removing apart, so expect two licensed companies on a larger job, and no guarantee of a mold-free home.
Mold grows where moisture stays, and after water damage that usually means drywall, insulation, baseboards and the base of cabinets. It can trigger allergy and asthma symptoms in some people. The CDC calls the phrase toxic mold inaccurate, so this page does not use it.
Texas regulates this work by statute. Texas Occupations Code Chapter 1958, enforced by the Texas Department of Licensing and Regulation, sets licensing for mold assessors and mold remediators. Under that law, an area of mold less than 25 contiguous square feet does not require a license to remediate, and 25 contiguous square feet or more does.
The rule that surprises people is the split. A license holder may not both assess and remediate the same project, and may not own an interest in both companies. That is why this page describes what happens in two steps with two parties, and why no company that follows the law will sell you testing and removal as a single package.
If mold covers less than 25 contiguous square feet of surface, Texas does not require a license for remediation. At 25 contiguous square feet or more, a licensed remediator must do the work. Measure the connected area, not the total across a house, and ask a licensed assessor if you are unsure.
Contiguous means connected, so three separate patches in three rooms are measured separately. That distinction matters, and so does the way the area is measured. A licensed assessor can measure it and write it down.
Staying under the threshold does not make the mold harmless, and it does not remove the need to dry the cause. It only changes who can legally do the removal.
Texas bars a license holder from both assessing and remediating the same project, and from owning an interest in both companies. The two roles stay apart so the person who sizes the problem never profits from the fix. You hire a licensed assessor for the plan and a licensed remediator for the work, and the assessor checks the result.
The law exists because the person who decides how much mold there is should not profit from removing it. That separation can feel like extra work, but it protects you from a scope that grows to fit a sales target.
If a company offers both on one project, ask how it satisfies the rule. A company that follows Chapter 1958 will refer you to the other half.
It is a document issued under Texas law after a licensed remediation, showing the work met the protocol. If you sell the property, you must give the buyer every certificate issued in the preceding five years. Keep the certificate with your closing records, along with the assessor's protocol and the drying log.
A certificate documents the work. It is not a guarantee that mold will never return, and no company in this trade can promise that. Moisture can return if a leak does.
If you are not sure whether a past job produced a certificate, ask the company that did the work. The Texas Department of Licensing and Regulation also maintains a license lookup for assessors and remediators.
Ask for the company's TDLR license and the licenses of the individuals working on your job, then check them in TDLR's license lookup. A licensed remediator should be able to show both. Do not accept a business card as proof, and confirm that the assessor and the remediator are two separate companies.
Do not accept a business card or a promise as proof. A real license can be confirmed online in a minute, and a company that is licensed will not mind the question.
Also ask who the assessor is and confirm that the two companies are separate. Once you have the protocol in hand, compare quotes against the same written scope.
The remediator seals the work area, removes affected porous materials, HEPA vacuums and cleans surfaces that can be saved, and bags waste before it leaves the containment. On a protocol job the plan sets the scope and the assessor checks the result. Drying and repairs follow after the area passes.
Expect plastic sheeting, zipper doors and air filtration units that make a lot of noise. Workers wear respirators and disposable suits, and you will be asked to stay out of the area. The process is slower than most people expect, because each stage depends on the one before it.
Once the area is cleared, the drywall, insulation and trim that came out are replaced. That repair is quoted separately and is not part of the remediation scope, which keeps the mold work and the rebuild distinct on your invoice.
Do not disturb a large patch of mold by scrubbing, sanding or cutting it, since that can spread spores through the house. Turn off the HVAC fan if growth is near a vent, and keep children, pets and anyone with asthma away from the area.
Mold returns if the leak or the humidity that fed it remains. A plumber, roofer or HVAC technician repairs the source, and drying brings materials to a dry reference.
A separate licensed assessor inspects, maps the growth and writes the plan the remediator must follow. The assessor is not the crew that removes the mold.
The remediator seals off the work area, uses negative air with HEPA filtration where the plan calls for it and keeps foot traffic controlled. The aim is to keep spores from spreading.
Porous materials with growth, such as drywall and insulation, are removed and bagged. Surfaces that can be cleaned, such as framing, are HEPA vacuumed and cleaned.
On a protocol job, the licensed assessor checks the work against the plan, and a Certificate of Mold Damage Remediation may follow. You keep the paperwork with your records.
Texas does not require a license for remediation of an area this small. A homeowner or a general contractor may handle it, though drying the cause still comes first. A licensed assessor can still look at it if you want certainty.
A licensed remediator must do the work, following a protocol from a licensed assessor. The two work for you separately, and neither may have an interest in the other.
Growth that follows contaminated water often involves materials that should have been removed. The sewage cleanup and flood pages describe why. Mold in those cases is usually part of a larger scope.
Mold remediation prices are set by the area, the materials removed and the containment required. The assessor is a separate company and is priced separately.
| Job | Typical range | What it includes |
|---|---|---|
| Small mold remediation (under about 10 sq ft, contained) | $500–$1,500 | Typical for a small drywall or trim area |
| Moderate mold remediation (larger drywall or flooring area) | $1,500–$3,500 | More removal and some containment |
| Large mold remediation (100+ sq ft, full containment) | $3,000–$6,000, more for a whole attic or house | Negative air and extended work time |
| Antimicrobial application (per sq ft) | $0.50–$2.00 | Used on cleaned surfaces where a protocol calls for it |
| Mold inspection and assessment by a licensed assessor (visual and moisture mapping) | $150–$600 | A separate company from the remediator |
These figures are typical rather than quoted, and mold prices across Texas vary widely. A licensed remediator prices the real job from the assessor's protocol, not from this table.
A crew is dispatched as fast as one is available, and you approve the estimate before any work starts.
A sealed, air-conditioned slab house keeps moisture in once water gets into a wall or under flooring, and North Texas summers are humid. Mold often follows a leak that was not dried to a documented goal, such as an attic heater drip or a slow supply-line leak. Drying within a day or two matters most.
In Denton County, that pattern shows up in the same places this site's other pages describe: ceilings under attic equipment, wall bases after a pipe failure and cabinet bases after a floor leak. A licensed assessor's map shows where growth is, and a drying log shows how fast the area dried.
For the water side of the work, see structural drying, which explains the readings that lower mold risk. The inspection page, mold inspection, covers the assessor's role in detail.
How a Texas mold assessment works in Lewisville: a separate licensed assessor inspects and writes the plan before any removal.
Air movers, dehumidifiers and daily moisture readings that dry Lewisville walls, floors and cabinets to a written goal.
Water removal, drying to a documented goal and repair quotes for Lewisville and Lewisville Lake area homes, with phones answered 24/7.
Protective removal, cleaning and drying after a sewer or drain backup in Lewisville, handled as Category 3 water.
Not sure if you're covered? Check your ZIP code.
In Texas, mold remediation on 25 contiguous square feet or more of surface requires a license from the Texas Department of Licensing and Regulation, and the same license holder may not both assess and remove mold on one project.
Texas does not require a license for areas under 25 contiguous square feet, and many homeowners clean small patches on hard surfaces. Fix the moisture first, wear gloves and a mask, and if growth is on drywall or insulation, removal is usually better than cleaning.
Bleach can discolor surface growth on hard materials, but it does not solve a moisture problem and does not reach into porous materials. The better step is to dry the area and remove materials with growth.
It can if moisture returns. Remediation removes the growth, and drying and repairs remove the cause. No one can honestly guarantee a house stays mold-free forever.
For 25 contiguous square feet or more, a TDLR-licensed remediator, and that is a different company from the assessor who wrote the plan. Ask to see the license and check it yourself. Below that size, a license may not be needed, though the cause still has to be dried.
Coverage varies by policy, and many policies limit mold. The insurer decides under your policy, so ask your agent early, and keep the assessor's report, readings and photographs.
Not as a rule. A visual inspection and moisture mapping usually tell the story, and the mold inspection page explains why sampling is optional.