How to Choose a Mold Remediation Company in Texas

Verify TDLR Licensing Before You Talk Price

Texas requires separate licenses for mold assessment and mold remediation under the Texas Mold Assessment and Remediation Rules (TMARR). A company cannot legally perform both services on the same property — this isn't an optional best practice, it's state law designed to prevent conflicts of interest.^[1]

You need two different companies: one to assess (identify mold type, measure contamination, write the protocol) and one to remediate (execute the removal work). The assessor creates a written remediation protocol. The remediation company follows it. After work finishes, the assessor returns for post-remediation verification testing to confirm clearance.

Check both companies at https://www.tdlr.texas.gov/mol/mol.htm before signing anything. Enter the company name or license number. You're looking for an active Mold Remediation Company license (not just a worker license). The lookup shows license status, issue date, expiration, and any disciplinary actions.

If the company isn't listed, they're operating illegally.

Houston, Dallas, and San Antonio see frequent enforcement actions against unlicensed operators — TDLR issued 47 citations in 2025 for unlicensed mold work in Harris County alone. These companies typically underbid licensed contractors by 30-40%, skip containment protocols, and disappear when the mold comes back. Your homeowners insurance won't cover repeat remediation if the original contractor wasn't licensed.

The Moisture Source Problem Texas Contractors Ignore

Mold doesn't grow without water. If a remediation company quotes you without identifying and fixing the moisture source, they're selling you temporary cosmetic work.^[2]

Texas homes have three dominant moisture triggers that licensed assessors should identify before remediation starts.

Slab leaks account for 60% of major mold claims in Dallas-Fort Worth and Houston. Your plumbing runs under a concrete slab that sits on expansive clay soil. The clay swells when wet, shrinks when dry, and shifts your foundation just enough to crack copper pipes or stress PEX fittings. You get a pinhole leak that runs for months before you notice higher water bills or soft flooring. By then, moisture has wicked up through the slab into drywall, creating ideal conditions for Stachybotrys, Chaetomium, and other water-damage molds.

AC condensate issues are year-round in Texas because you run cooling 8+ months annually. Drain pans overflow when the condensate line clogs with algae. Poorly insulated ductwork in unconditioned attic space creates condensation that drips onto insulation.

Companies that remediate attic mold without inspecting ductwork and drain lines will see you again in 18 months.

Hurricane and storm damage creates a third moisture pattern along the Gulf Coast. Post-Harvey Houston developed a permanent cohort of homes with recurring mold because initial remediation didn't address roof penetrations, compromised flashing, or foundation cracks that let rainwater seep into wall cavities during heavy weather.

A credible remediation contractor will not start work until the moisture source is repaired. That might mean hiring a plumber for slab leak detection, an HVAC tech to re-pitch condensate lines, or a roofer to replace flashing before the mold crew touches anything.

If they offer to "dry it out and kill the mold" without addressing why water got there, find someone else.

What a Written Remediation Protocol Actually Looks Like

TDLR-licensed mold assessors must provide a written remediation protocol before work begins. This isn't a one-page estimate — it's a detailed work plan specifying containment type, removal methods, cleaning procedures, and clearance criteria.^[2]

Your protocol should define the contamination level using the IICRC S520 mold remediation standard. Small isolated areas under 10 square feet (Level 1) require minimal containment. Contamination between 10-100 square feet (Level 2) requires plastic sheeting barriers and negative air pressure. Anything over 100 square feet (Level 3) demands full containment with decontamination chambers and respiratory protection for workers.

San Antonio and Austin see widespread protocol violations on new construction mold jobs — contractors treat 200 square feet of spray foam mold growth as a Level 1 job, skipping containment because "it's just surface mold." That spreads spores through the entire HVAC system. Post-remediation air testing then fails, the buyer's deal falls through, and the builder sues the remediation company.

The protocol must specify what gets removed versus what gets cleaned. Porous materials (drywall, insulation, carpet pad) with heavy contamination get removed and discarded in sealed bags. Semi-porous materials (wood framing, concrete) get HEPA-vacuumed and treated with antimicrobial solutions. Non-porous surfaces (metal, glass) get cleaned with detergent.

A protocol that says "remove affected materials" without specifics is a red flag.

Look for air filtration details. Protocols should specify the number of HEPA air scrubbers, the air changes per hour (ACH) required, and how long machines run after material removal. Typical containment requires 4-6 ACH with machines running continuously during demo and for 24 hours after final cleaning.

Questions That Separate Licensed Pros from Weekend Warriors

Ask these five questions on your first call. Hesitation or vague answers mean you're talking to someone who doesn't do this full-time.

"What's your TDLR Mold Remediation Company license number?" They should recite it immediately or send it in a follow-up email within an hour. If they say "we're working on it" or "we use subcontractors who are licensed," hang up. The company holding the contract must hold the license.

"Who's doing the post-remediation verification testing?" The answer must be a different TDLR-licensed assessment company. If they say "we do our own testing" or "testing isn't required," they don't understand Texas law. You need third-party clearance before reconstruction starts.

"How do you handle HVAC systems in the containment area?" Proper answer: seal all supply and return vents in the work area with plastic and tape before containment goes up, then clean ducts if the system was running during mold growth. Wrong answer: "We'll just turn off the AC while we work." That doesn't prevent cross-contamination.

"What's your insurance coverage?" You need proof of general liability ($1M minimum), pollution liability (covers mold-specific claims), and workers compensation. Texas doesn't require contractors to carry workers comp, but mold remediation involves hazardous work. If their worker gets hurt on your property and they don't have coverage, you're liable.

Ask for certificates before they start.

"Can I see a sample remediation protocol from a similar job?" They should show you a redacted protocol (client details removed) that matches the format described above. If they've never written one, they're not running jobs that meet TDLR standards.

Red Flags in Estimates and Contracts

You'll get wildly different quotes for the same mold problem — $1,200 from a handyman with a truck, $6,500 from a TDLR-licensed company.

The price gap reflects methodology, not profit margins.

Quotes based on square footage alone miss the point. Remediation cost depends on contamination level, material type, and access difficulty. Removing mold from 100 square feet of drywall in an open bedroom costs $2,000-3,000. Removing 100 square feet of mold from wall cavities behind a finished bathroom with cast-iron plumbing (common in pre-1980 Houston pier-and-beam homes) costs $8,000-12,000 because you're dealing with demolition, plumbing relocation, and reconstruction.

Estimates that don't mention containment or air scrubbers are cosmetic cleaning jobs. You're paying someone to wipe visible mold with bleach or spray a biocide, then paint over the stain. This fails post-remediation air testing 80% of the time because spores spread during the work.

Fixed-price contracts without contingencies create problems when contractors open a wall and find more damage than the initial assessment revealed. Slab-on-grade homes with foundation movement often have mold extending 6-8 feet beyond the visible water stain because moisture wicked horizontally through the slab.

Your contract should include language for change orders if contamination exceeds initial scope.

Beware of companies that offer both assessment and remediation by using separate "divisions" or saying "we have an assessor on staff." TDLR prohibits this even if the licenses are technically separate. The law requires independent third-party assessment to prevent companies from inflating scope.

Watch for payment terms that front-load costs. Typical structure: 25% deposit, 50% when containment and demo finish, 25% after clearance testing. If they want 75% upfront, they're either financially unstable or planning to do minimal work and walk.

The Post-Remediation Verification You Can't Skip

Texas law requires an independent mold assessment company to conduct clearance testing after remediation finishes. The assessor performs a visual inspection and collects air samples (typically three: one inside the remediation area, one in an adjacent unaffected area, one outdoors for baseline comparison).

Lab results compare indoor spore counts to outdoor baseline. You're looking for counts at or below outdoor levels and a normal spore diversity (no single species dominating).

If indoor counts are 2-3x higher than outdoor or you see elevated Stachybotrys/Chaetomium (species that don't grow outdoors), the job failed.

Failed clearance testing happens in 15-20% of jobs in DFW and Houston, usually because contractors skipped proper containment or didn't run air scrubbers long enough after demo. When this happens, the remediation company must re-clean at no additional cost and retest until clearance is achieved. Your contract should explicitly state this.

Some homeowners skip clearance testing to save $400-600. This is catastrophic if you're selling the house — buyers will demand testing during option period, and failed results kill deals. It's equally bad if you're staying, because you've just paid $5,000-15,000 for work that didn't solve the problem.

How Texas Climate and Construction Shape Remediation Approach

Houston's 90% summer humidity, Dallas's rapid weather swings, and San Antonio's 300+ ppm hard water all create region-specific mold patterns. Companies working statewide should adjust protocols based on local conditions.

Gulf Coast contractors (Houston, Corpus Christi, Beaumont) encounter hurricane-related mold repeatedly. They should have experience with FEMA flood claims, understand how to document pre-loss conditions for insurance, and know the timelines for emergency structural drying after Category 3+ wind-driven rain events.

Post-Harvey remediation revealed that homes with brick veneer and insufficient flashing detail allowed water intrusion through weep holes — a construction defect common in 1990s tract housing.

North Texas remediation (Dallas, Fort Worth, Plano) deals with expansive clay soil movement as the dominant moisture driver. Contractors here should partner with foundation repair companies and offer integrated solutions — they stabilize the slab, repair the plumbing leak, then remediate the mold. Companies that only do mold work leave you coordinating three separate contractors.

Central Texas (Austin, San Antonio, Round Rock) has rapid new construction with spray foam insulation defects. Builders apply closed-cell foam directly to roof decking without proper attic ventilation. Moisture gets trapped, condenses on the underside of the decking, and creates mold growth across hundreds of square feet. Remediation requires removing foam, treating decking, verifying wood moisture content below 16%, then re-insulating correctly.

This is specialized work — companies without spray foam experience routinely underbid jobs and lose money when scope expands.

Older pier-and-beam homes in East Texas (Tyler, Longview, Nacogdoches) have crawl space moisture issues from inadequate vapor barriers and poor drainage. Remediation should include vapor barrier installation and grading adjustments, not just mold removal. Contractors who only treat the symptom see recurring growth within two years.

Insurance, Licensing, and When to Walk Away

Texas doesn't require mold remediation contractors to carry workers compensation insurance, but you should demand it anyway. Mold work involves confined spaces, respiratory hazards, and demolition.

One worker injury can trigger a homeowner liability claim that exceeds your umbrella policy limits.

Ask for certificates proving:

• General liability insurance ($1M occurrence / $2M aggregate minimum)
• Pollution liability or environmental impairment coverage (mold-specific)
• Workers compensation (even though not legally required)
• Commercial auto (if they're transporting contaminated materials)

Verify these certificates directly with the insurance carrier — fake certificates are common. The carrier's name and policy number are on the cert. Call and confirm the policy is active and lists your address as a covered location.

TDLR licensing requires proof of insurance to maintain active status, but policies lapse between renewal periods. Check the certificate date against the current date.

Walk away immediately if the contractor:

• Offers to do both assessment and remediation
• Can't produce a TDLR license number within 24 hours
• Guarantees mold won't return (no legitimate company does this)
• Pressures you to skip post-remediation verification testing
• Suggests routing payment through a public adjusting company they refer
• Won't provide client references from jobs completed in the past 12 months

These patterns show up in 90% of TDLR complaints filed by Texas homeowners. Companies operating this way are either incompetent or deliberately cutting corners.

Timeline Expectations and Project Management

Small jobs (under 100 sq ft, single room) take 3-5 days from containment setup to clearance testing. Medium jobs (100-300 sq ft, multiple rooms or complex access) take 7-10 days. Large jobs (whole-house remediation after flooding) take 3-4 weeks.

Your contractor should provide a written schedule showing:

• Day 1: Containment setup, negative air machines installed
• Days 2-3: Demolition and material removal
• Days 4-5: HEPA vacuuming, surface cleaning, antimicrobial application
• Day 6: Air scrubbers run 24 hours after final cleaning
• Day 7: Third-party assessor conducts clearance testing
• Days 8-9: Lab results return; containment comes down if passed
• Day 10+: Reconstruction begins (separate contractor or same company if they hold appropriate licenses)

Delays happen when clearance testing fails or hidden damage appears. Contractors who've handled 200+ jobs in Texas typically build 15-20% schedule buffer into quotes.

Communication matters more than speed. You should receive daily photo updates showing work progress, material disposal documentation (mold waste goes to approved landfills, not dumpsters behind shopping centers), and air scrubber runtime logs.

Legitimate companies document everything because they know insurance adjusters and buyers' inspectors will ask for proof.

Reconstruction and the Contractor Coordination Problem

Mold remediation stops when clearance testing passes. You're left with a room stripped to studs, or an attic with missing insulation, or a bathroom with exposed plumbing.

Some TDLR-licensed mold companies also hold general contractor licenses and offer reconstruction. This is legal as long as the mold assessment came from an independent third party. It simplifies coordination — one company handles demo through reconstruction.

Other mold companies only remediate. You'll hire a separate general contractor for reconstruction.

This creates a finger-pointing risk if mold returns — the mold company blames improper reconstruction (new drywall installed before framing fully dried), the GC blames incomplete remediation.

Mitigate this by:

• Requiring the remediation contractor to verify wood moisture content below 16% before containment comes down
• Hiring a GC who's worked with the mold company before (ask for references)
• Including both contractors in a pre-construction meeting where the GC reviews the remediation protocol and clearance report
• Specifying in both contracts that moisture testing is required before new drywall goes up

Houston and Austin general contractors experienced in post-flood reconstruction know these steps. Suburban builders doing their first mold job often skip them, leading to repeated remediation cycles.

Finding Licensed Companies and Checking Track Records

TDLR's public database shows every licensed mold company in Texas, but it doesn't rank quality. You need additional vetting.

Check complaint history through the Better Business Bureau and TDLR's enforcement database. A company in business 10+ years with zero complaints is either excellent or doesn't take on challenging jobs. One or two resolved complaints aren't disqualifying if the resolution shows good faith.

Five+ unresolved complaints in three years is a pattern.

Ask for client references from jobs in your city completed in the past 12 months. Call three and ask: Did clearance testing pass on first attempt? Did costs match estimates? How did they handle unexpected damage? Would you use them again?

Verify IICRC certification in Applied Microbial Remediation (AMRT) or Water Damage Restoration (WRT). IICRC isn't required in Texas, but it shows the company invests in ongoing training. The S520 mold remediation standard published by IICRC is the industry baseline — contractors certified in AMRT know it backward.

Look for manufacturer certifications from equipment companies like Dri-Eaz, HEPA air scrubber manufacturers, or antimicrobial product suppliers. These certifications require documented training and prove the company uses professional-grade equipment, not consumer rental machines from Home Depot.

Search the company name plus "lawsuit" or "complaint" in Google and Texas state court records. Litigation isn't always the contractor's fault, but patterns matter. Three lawsuits for incomplete work or three insurance disputes for inflated claims suggest operational problems.

What Good Mold Remediation Actually Costs in Texas

Pricing varies by metro, but general ranges for TDLR-licensed companies in 2026:

Initial mold assessment: $400-800 for residential (includes visual inspection, moisture mapping, air/surface samples, written protocol). Real estate transaction inspections run $300-500 because scope is narrower.

Small remediation (under 10 sq ft, Level 1): $1,500-2,500. Includes containment, removal, cleaning, air scrubbing, disposal. Does not include reconstruction.

Medium remediation (10-100 sq ft, Level 2): $3,000-7,000 depending on material type and access. Bathroom mold behind tile or wall cavity mold requiring plumbing relocation sits at the higher end.

Large remediation (100+ sq ft, Level 3): $8,000-25,000+. Whole-house jobs after flooding or attic mold across 500+ sq ft of roof decking reach the upper range. These jobs may involve structural drying, contents cleaning, and temporary relocation costs.

Post-remediation verification: $400-650 for air testing and visual inspection by third-party assessor.

San Antonio and Houston average 10-15% higher than state averages due to demand from recurring flood events and older housing stock with foundation issues. Austin runs 15-20% higher because of limited contractor availability relative to rapid population growth.

Quotes below these ranges typically come from unlicensed handymen or companies cutting containment corners. Quotes significantly above suggest unnecessary scope (some companies recommend removing materials that could be cleaned) or inefficient operations.

Always get three quotes from TDLR-licensed companies and compare scope, not just price. The lowest bid often excludes containment, air scrubbers, or post-cleaning. The highest bid may include reconstruction or preventive treatments you don't need.

When DIY Makes Sense (Rarely) and When It's Dangerous

EPA and CDC guidelines permit DIY mold cleanup for small areas under 10 square feet if you're healthy, the mold resulted from clean water (not sewage), and you use proper PPE.^[3]

This applies to surface mold on bathroom tile, small spots on windowsills from condensation, or mold on non-porous surfaces you can reach without demolition. You need an N95 respirator, gloves, eye protection, and a HEPA vacuum for post-cleaning.

DIY becomes dangerous when:

• Mold is in HVAC systems or ductwork — you'll spread spores throughout the house
• You have health conditions (asthma, COPD, immunocompromised) — mold exposure during cleanup can trigger severe reactions
• The source is sewage, greywater, or flood water — these introduce bacteria and pathogens alongside mold
• Contamination exceeds 10 square feet — containment and negative air pressure are required to prevent cross-contamination
• Mold is in wall cavities, under flooring, or above ceilings — you can't see the full extent and risk spreading spores during demo

Texas-specific DIY risks: Slab leaks often create hidden mold growth 4-6 feet beyond the visible damage. You'll open drywall expecting a small patch job and find extensive contamination requiring Level 2 or 3 remediation.

At that point you've already released spores without containment.

Pier-and-beam crawl spaces in older neighborhoods (Houston Heights, Dallas Lakewood, Austin Hyde Park) look accessible for DIY work, but they often contain asbestos-wrapped ductwork or lead paint on floor joists. Disturbing these materials without proper abatement creates liability that far exceeds remediation costs.

If you're selling a home and the buyer's inspector finds mold, DIY cleanup won't satisfy lender requirements. Conventional mortgages typically require TDLR-licensed remediation and third-party clearance testing before closing.

The Real Estate Transaction Wildcard

Mold discovered during option period creates intense time pressure. You have 7-10 days (standard option period in Texas) to get an assessment, remediation protocol, contractor lined up, and pricing to the buyer's agent.

Sellers often make mistakes here:

• Hiring the first company that answers the phone (who may not be TDLR-licensed)
• Accepting a verbal quote without a written protocol (buyer's lender won't accept this)
• Skipping post-remediation verification to save time (lender requires clearance)
• Trying to negotiate a closing credit instead of completing work (FHA/VA loans prohibit this for health hazards)

Smart approach: Get a TDLR-licensed assessment within 48 hours of the buyer's inspection report. The assessor provides a protocol. You solicit bids from 2-3 licensed remediation companies.

You present options to the buyer: complete work pre-closing with third-party verification, or negotiate a specific credit amount that exceeds the highest quote by 25% (to cover buyer's hassle and risk).

Buyers frequently demand remediation plus a price reduction. This is negotiable based on local market conditions, but the remediation itself is non-negotiable if the lender flags it.

Post-remediation verification must happen before closing. Title companies won't release funds if the lender's final walkthrough reveals incomplete work.

Budget 10-14 days minimum from assessment to clearance — trying to compress this into a 7-day option period fails 60% of the time, forcing contract extensions or deal termination.