Mold Removal in Houston: What Homeowners Need to Know

Houston remediation companies will rip out your drywall and HEPA-vac every surface. An independent assessor runs clearance testing (Texas law requires the assessor and remediator be different companies). And for the building, that's the right approach. But here's what nobody in the remediation industry tells you: about 24% of the population carries genetic variants that prevent their immune system from clearing mold biotoxins on its own. For those people, successful remediation doesn't mean the health effects resolve on their own. The remediation crew leaves, the invoice gets paid, and the homeowner still can't think straight.

That gap between "building fixed" and "person fixed" is what this article is actually about.

Houston's climate makes all of it worse. Average relative humidity: 75%. Annual rainfall: nearly 52 inches. When Hurricane Beryl knocked out power for more than 2 million residents in 2024, homes across Harris County sat in heat and moisture with no AC for days. Mold starts growing within 24 to 48 hours of water intrusion. In this climate, it doesn't wait.

"Exposed to high levels of toxic mold for months in a rental home. Brain fog, fatigue, sick more often, working memory clobbered. Treatment with MoldCo has been a huge blessing, finally recovering. If not for them mold wouldn't even be on my radar as a potential cause. Most doctors aren't trained to diagnose it." — MoldCo patient

What good remediation looks like (and what gets skipped)

Most homeowners have never watched a mold job, so they can't tell when corners are being cut. Here's what a proper remediation sequence involves, and the Houston-specific details that matter.

A licensed mold assessment consultant (not the remediation company; Texas law requires separation) maps moisture, inspects visually, and samples. If you're in an older Heights-area home with a pier-and-beam foundation, moisture accumulates underneath in ways that slab-on-grade homes in Katy or Meyerland don't experience. The crew then seals the contaminated area with plastic sheeting and runs HEPA-filtered air scrubbers under negative pressure. In Houston, where HVAC runs nearly year-round, they should also isolate connected ductwork. Skip that step and you're blowing spores through the whole house.

Next comes demolition. Porous materials that can't be cleaned (drywall, insulation, carpet) get cut out and double-bagged. After Harvey, entire neighborhoods in Katy and Meyerland went through this when reservoir releases flooded over 10,000 homes. Every remaining surface gets the "HEPA sandwich": HEPA-vacuumed, damp-wiped, then HEPA-vacuumed again. Some companies also fog the air and wipe down walls and ceilings afterward for additional particle capture.

Dead mold still contains mycotoxins that remain bioactive for mold-susceptible people, so physical removal matters even after growth stops. Any company spraying biocides instead of physically removing contaminated materials is not meeting IICRC S520 standards, which call for removal over chemical kill methods.

The final step is clearance testing by an independent assessor. FEMA recommends professional verification. We go further: retest with a HERTSMI-2 dust sample about 4 weeks later. Spore trap air tests capture a single-moment snapshot and miss smaller fragments. HERTSMI-2 uses DNA analysis to quantify 5 mold species tied to water-damaged buildings. Below 11 is generally safe. Between 11 and 15 is borderline. Above 15 is dangerous.

For more on test types and what they actually measure, see our mold inspection and detection guide.

Texas licensing: what to verify before you hire

Texas is one of roughly 5 states with mandatory mold licensing, which sounds reassuring until you realize how many unlicensed operators still advertise on Google. The TDLR oversees all mold licenses under Chapter 1958 of the Texas Occupations Code. Senate Bill 1255, signed June 2025, updated this framework effective September 2025.

Before signing anything, verify three things. First, confirm the company holds a current Mold Remediation Contractor (MRC) license from TDLR through their online portal. Second, ask to see IICRC certifications, specifically the S520 Standard for Professional Mold Remediation and the MRS credential. Third, make sure the assessor and remediator are different companies. Texas law requires this separation to prevent a company from inflating the scope of work. All licenses must be renewed every 2 years with 8 hours of continuing education.

We don't list specific companies because listing implies endorsement. Use the TDLR verification portal to do your own due diligence.

What remediation costs in Houston

According to Angi's Houston data, the average project runs about $2,025 (range: $888 to $3,298). HomeAdvisor's national average is $2,365, or $10 to $25 per square foot.

Scale matters. A bathroom or small closet (10-50 sq ft) runs $500 to $1,500. A bedroom wall, attic section, or crawl space (50-200 sq ft) hits $1,500 to $6,000. Full post-flood remediation across multiple rooms or involving HVAC systems (200+ sq ft) costs $6,000 to $15,000. Structural repairs can add $5 to $23 per square foot on top.

Post-hurricane demand surges spike pricing across the board. Nearly half of US residential buildings have mold, and in Houston's subtropical climate, the problem rarely resolves on its own. Unaddressed mold can lower resale value by 20% to 37%. After remediation, a MoldCo Home Test Kit ($199) can confirm the job was done right.

Insurance reality. Standard Texas homeowners insurance policies only cover mold from sudden, accidental water events like a burst pipe. Continuous leaks and flooding are typically excluded. The Texas AG's office notes most policies cap mold coverage at $5,000 to $10,000. The Texas Department of Insurance (TDI) requires insurers to offer optional enhanced mold endorsements, but most homeowners don't carry them until after a loss.

After remediation: the part everyone skips

This is where the system fails people. The remediation company hands you a clearance report and moves on. Your GP doesn't know what CIRS is. And you're left wondering why you still feel terrible in a house that tested clean.

If you're experiencing brain fog, fatigue, respiratory issues, or joint pain after water damage or mold exposure, those symptoms are consistent with mold exposure symptoms that won't resolve just because the building is fixed. See the full list of warning signs of mold toxicity.

Verify the building first. Our MoldCo Home Test Kit ($199) ships a HERTSMI-2 dust collection kit to your door. You collect the sample, mail it to the lab, and get a score with clear interpretation. Wait about 4 weeks after remediation before collecting so dust settles and the test captures an accurate picture.

Then check your body. A Starter Health Panel ($56) measures 3 key biomarkers through LabCorp. Houston has 18 LabCorp locations. Our mold illness testing guide explains what each test measures and when to order it.

"MoldCo gave me my life back!!! I struggled for years with chronic symptoms that other doctors wanted to give me band-aid solutions for, but with MoldCo, I actually got to the root cause. I have gone from being bedridden to feeling the best I ever have within a few years, and I owe the majority of my progress to MoldCo's protocol!" — MoldCo patient

Few practitioners trained in Dr. Shoemaker's Protocol work in the Houston area, and for a metro this size, specialist availability is limited. That's one reason telehealth works well here. MoldCo offers clinician-supported treatment after remediation through telehealth. If your home is clean but your body isn't recovering, that's worth looking into.

"My experience with MoldCo is genuinely life-changing. I was able to get MoldCo's lab testing early this year after dealing with constant brain fog and feeling like I didn't have the energy to do my work. I was amazed when I received my results because they came with a clear guide that explained what everything meant and what steps I needed to take next." — MoldCo patient

Frequently asked questions

Is MoldCo available in Houston?

Yes. Texas is a full-service state. You can get lab testing (blood panels at LabCorp) at 18 locations across Houston. Telehealth treatment through MoldCo Care is also available. Start your evaluation online.

How quickly does mold grow after Houston flooding?

Mold starts growing within 24 to 48 hours of water intrusion. At 75% average humidity, Houston homes don't dry out on their own. After Hurricane Beryl in 2024, prolonged power outages meant many homes sat in ideal mold conditions for days.

Does Texas require mold remediation licensing?

Yes. Texas requires a Mold Remediation Contractor (MRC) license through the TDLR. The law also mandates that the assessor and remediator be different companies.

What Houston neighborhoods have the highest mold risk?

Meyerland flooded three times in three years (2015, 2016, Harvey 2017). Greenspoint has aging apartment complexes with chronic mold near Greens Bayou. Kingwood saw 16,000 homes flood when Lake Houston surged during Harvey. Clear Lake faces compound risk from storm surge and land subsidence. The CDC notes that any home with water damage history carries elevated risk.

Should I test after remediation?

Yes. Standard clearance testing captures a snapshot, but we recommend a HERTSMI-2 dust test about 4 weeks later. You can order a MoldCo Home Test Kit ($199) and collect the sample yourself. For a deeper explanation of professional mold inspection methods, see our separate guide.

How much does mold removal cost in Houston?

Average project: about $2,025 (range: $888 to $3,298). Larger projects (200+ sq ft) can run $6,000 to $15,000, and jobs requiring remediation in multiple rooms can cost even more. Post-hurricane demand and HVAC involvement push costs higher.

Take the next step. Verify the remediation worked. Check whether your body needs attention too.

• Order a MoldCo Home Test Kit ($199) for post-remediation HERTSMI-2 verification
• Order a Starter Health Panel ($56) to check 3 key mold-related biomarkers at LabCorp
• Check your eligibility for MoldCo Care for clinician-supported telehealth treatment
• Take the signs quiz to see if your symptoms match mold toxicity patterns

"Super smooth experience! I got my lab appointment relatively fast, and there were no complications or friction points. Waited a few days to hear back and MoldCo helped with everything from there!" — MoldCo patient

This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation.