Mold Remediation in Houston, and How Texas Says It Must Be Done

What mold remediation in Houston really involves

Mold remediation in Houston is more than scrubbing a stain. It means finding why a wall, ceiling or floor stayed wet, cutting out what mold has grown into, keeping spores from drifting to clean rooms, and then proving the area is clear.

Texas treats that work as a licensed trade. The Texas Department of Licensing and Regulation (TDLR) licenses the people who plan mold jobs and the people who carry them out, and its rules lay down the order of events for larger projects. If you know that order, you can tell quickly whether a company is doing things properly.

Water Damage Pro Houston does no mold work of any kind; it is a free phone service. When you call, an automated assistant asks what happened and transfers you to an independent, locally owned Houston-area restoration company. That company, or the professionals it works alongside, handles the inspection, the estimate and the remediation, and bills you for it.

Who needs a remediation job, not a quick cleaning

Small surface mold on a hard, cleanable surface is a different problem from mold that has grown through drywall, insulation, carpet pad or the bottom plate of a wall. Remediation is the right call when:

• The growth covers a large area, or several smaller patches add up across one wall or room.
• It follows a flood, a long slab leak, a roof leak during a hurricane, or a pipe that leaked inside a wall for weeks.
• The water was dirty: sewage, a toilet overflow or rising floodwater. The IICRC calls that Category 3 water, the most contaminated kind.
• You smell mold but cannot see it, which usually means it is behind a wall, under flooring or inside a cabinet base.
• Someone in the house has asthma, allergies or a weakened immune system.
• You plan to sell, refinance or file an insurance claim and want paperwork that shows the job was done to Texas rules.

If you cannot tell which side of that line you are on, the mold removal and cleaning page explains where Texas draws it, and the mold inspection and testing page covers when a licensed assessor should look first.

Mold remediation laws in Texas: the order of events

For a project where mold affects 25 contiguous square feet or more, TDLR's rules set out a sequence. Each step involves a document you can ask to see. Here is how a properly run Houston job moves from start to finish.

1. A licensed mold assessment consultant inspects. The consultant works out where the mold is, how much material is affected and what caused the moisture. Sampling may or may not be part of this; the EPA says that when mold is visible, sampling is often unnecessary.
2. The consultant writes a remediation protocol. This is the written plan for your specific project. TDLR requires it to name the rooms or areas involved, the quantities of material to be removed or cleaned, the protective equipment workers must wear and the containment to be used. You must receive it at least one calendar day before remediation begins.
3. A separate licensed mold remediation contractor writes a work plan. The protocol says what must happen; the work plan says how the contractor will do it, step by step. TDLR says a work plan is required on every remediation project, whatever its size. Texas rules keep the assessor and the remediator on a project separate, so the same company cannot write the plan and then carry it out.
4. TDLR is notified. For projects of 25 contiguous square feet or more, the license holder files a notification with TDLR at least 5 days before the project begins. You should also receive the Consumer Mold Information Sheet before any mold work starts.
5. Containment goes up. The contractor seals off the work area with plastic sheeting as the protocol specifies. With walk-in containment, TDLR inspectors check that supply and return air vents are blocked and that air pressure inside the containment is lower than outside it. That lower pressure, often called negative air, means air leaks into the work area rather than out of it, so spores are less likely to reach the rest of the house. Signs stay posted during active work.
6. Moldy porous material is removed and the area is cleaned. The EPA explains that mold works its way into porous materials such as drywall, ceiling tile and carpet, where it can be hard or impossible to remove completely, so those materials are usually cut out and bagged. Hard surfaces are cleaned, and the EPA's remediation guidance describes HEPA vacuums (vacuums with a high efficiency particulate air filter) for the final cleanup of dried material and dust.
7. The consultant performs a post-remediation assessment. Only a consultant who wrote a protocol in advance can declare that a project has achieved clearance. TDLR describes the check: the work area must be free of visible mold and wood rot, the job must match the protocol and work plan, and it must meet the clearance criteria written into the protocol. If it passes, you get a clearance report. Walk-in containment may not come down until the contractor has the consultant's written notice of clearance.
8. You receive a Certificate of Mold Damage Remediation. Within 10 days after remediation is complete, you should receive this certificate. Only a licensed remediator can issue one, and a job done with unlicensed workers cannot get one. Put it in the file with your deed and insurance papers.

One important exemption: owners or managers of residential property with fewer than 10 dwelling units do not need a license to do assessment or remediation on that property, so these rules do not stop a homeowner from dealing with mold in their own house. They do mean that anyone you hire to do it as a business needs the right TDLR license, and only licensed work produces a certificate. TDLR answers questions at 800-803-9202.

Why the certificate matters when you sell or insure

The Certificate of Mold Damage Remediation is a Texas Department of Insurance form (MDR-1). In it, the remediation contractor certifies that the mold damage was remediated, and the assessment consultant certifies that, with reasonable certainty, the underlying cause of the mold was addressed.

Selling. Texas law requires a property owner who sells to give the buyer a copy of each certificate issued for the property in the five years before the sale. TDLR's consumer sheet points this out. A buyer's inspector who finds signs of an old leak will usually ask about it, and a certificate answers that question with a document instead of a story.

Insuring. Under Texas Department of Insurance rules, an insurer may not make an underwriting decision on a residential property policy based on previous mold damage or a past mold claim if the property was remediated and a certificate shows the cause was dealt with, or an inspection by a licensed independent mold assessment consultant or licensed adjuster led to a certificate showing no evidence of mold damage. The rule (28 TAC 21.1007, last amended in 2021) still applies, and that protection depends on the paperwork, which a job done by unlicensed workers cannot produce. Ask your agent how your own insurer handles prior mold claims.

Houston conditions that make mold jobs bigger

Mold needs moisture and something to feed on, and Houston homes supply both. The EPA says that if wet materials are dried within 24 to 48 hours, mold usually will not grow. After a flood, a hurricane or a freeze, thousands of homes get wet at once, and many sit for days before anyone can start drying. Power loss makes it worse: when Hurricane Beryl knocked out electricity for about 2.2 million CenterPoint Energy customers in July 2024, many homes lost air conditioning, which the EPA lists among the ways to keep indoor humidity down.

Two building details show up again and again on Houston remediation jobs. Many homes sit on concrete slab foundations, so a leaking supply line under or beside the slab can wet the bottom of walls and flooring for a long time before anyone notices. And because so much of the region has flooded at least once (the National Weather Service counted more than 113,000 Harris County homes damaged by Harvey's flooding in 2017), older houses may hide past water damage behind newer paint and trim. The guide to how fast mold grows explains the humidity side of this in more detail, and the flood damage restoration page covers what happens before mold sets in.

Until a professional looks at it, keep doors to the affected room closed and stay out of it if you can. The EPA warns that running a heating and cooling system you suspect is contaminated with mold can spread mold through the building, so ask the consultant about the air conditioner before you lean on it. Take photos of what you can see for your insurer, and move valuables out of nearby rooms.

What drives the price of mold remediation in Houston

Nobody can give an honest price over the phone without seeing the job, and the line never prices anything. What you can know ahead of time is what pushes a quote up or down.

• Size of the affected areaSquare footage of material that has to come out sets the labor, bagging and disposal.
• Where the mold isAn attic, an air conditioning system or the inside of exterior walls takes more setup than an open bathroom wall.
• Containment neededThe protocol decides how much plastic, air filtration and pressure control the job calls for.
• The causeThe leak or moisture problem must be repaired, often by a plumber or roofer, and that is billed separately.
• Assessment feesThe consultant's inspection, protocol and post-remediation assessment are separate from the contractor's price.
• RebuildNew drywall, paint, flooring or cabinets after clearance is usually its own line item or a separate contract.

For a sense of scale only, Angi's Houston mold remediation cost page, as checked in October 2026, lists a typical cost of about $2,025, with most homeowners paying between $888 and $3,298, and notes that whole-home jobs can run far higher. That is a published average gathered by a cost site, not a price from the line or any company. Real Houston quotes vary with everything listed above. The water damage restoration cost guide covers the drying work that often comes first.

Questions to ask before you sign

• What is your TDLR license number, and who is the licensed consultant writing the protocol? (Look both up on the TDLR license search.)
• Is the consultant independent of your company on this project?
• Will TDLR be notified, and may I have a copy of the protocol and your work plan before you start?
• What containment will you use, and how will you protect the rooms next to it?
• Who repairs the leak or moisture source, and is that included?
• What happens if the area fails clearance, and who pays for the second round?
• When will I receive the Certificate of Mold Damage Remediation?

Other pages that help

Mold rarely arrives alone. If water is still coming in, start with emergency water removal or burst pipe water damage, then come back here once the source is stopped.

Related pages

• Mold Removal and Mold Cleaning
• Mold Inspection and Mold Testing
• Water Damage Restoration in Houston
• How Fast Does Mold Grow After a Leak?
• Does Homeowners Insurance Cover Water Damage?
• How to Check a Water Damage Company Before Hiring