How to Choose a Mold Remediation Contractor: 8 Questions to Ask
Updated 2026 · 6-minute read
Mold remediation is a specialized service that requires proper training, equipment, and a licensed contractor in most states. Choosing the wrong contractor — especially one who cuts corners on containment or doesn't fix the moisture source — means the mold comes back. Here's what to ask before you hire.
8 Questions to Ask Before Hiring
1. Are you licensed in this state?
Most states that regulate mold remediation require a separate mold contractor license. Ask for the license number and verify it with the state licensing board before signing anything. Our directory only lists contractors with active state licenses.
2. Are you certified by an industry organization?
Industry certifications from the IICRC (Institute of Inspection Cleaning and Restoration Certification) or ACAC (American Council for Accredited Certification) indicate additional training beyond state licensing. Common relevant certifications include IICRC WRT (Water Restoration Technician) and AMRT (Applied Microbial Remediation Technician).
3. Are you insured? What does your insurance cover?
Ask for proof of general liability insurance and workers' compensation. If a worker is injured on your property or causes damage during remediation, you want their insurance — not yours — to cover it. Get a certificate of insurance naming you as an additional insured.
4. What containment procedures do you use?
A legitimate contractor will describe plastic sheeting barriers, negative air pressure, and HEPA air filtration. If they don't mention containment or describe spraying and wiping without isolating the area, that's a red flag — they risk spreading mold spores to unaffected rooms.
5. Do you also address the moisture source?
Mold remediation without fixing the underlying moisture problem will fail. A good contractor either fixes the moisture source themselves or clearly identifies it and requires it be fixed before or during remediation. If a contractor focuses only on cleaning the mold without discussing moisture, be cautious.
6. Will you do post-remediation testing?
Post-remediation verification (PRV) confirms the job is complete. This typically involves air sampling or surface sampling after cleanup, before containment is removed. Some contractors use an independent third party for testing — this is actually a good sign, as it removes any conflict of interest.
7. What's your warranty or guarantee?
Reputable contractors typically offer a warranty of 1–5 years on their remediation work, meaning if mold returns due to their failure (not a new moisture problem), they'll address it. Get any warranty in writing before work begins.
8. Do you handle water damage restoration as well?
If your mold resulted from water intrusion — a flood, pipe leak, or roof damage — you may need both water damage restoration (extraction and drying) and mold remediation. Many contractors offer both. Hiring one company for both services is often more efficient and cost-effective than managing two contractors.
Red Flags to Watch For
- Cannot provide a license number or the license is expired
- Refuses to provide a written scope of work and itemized quote
- Offers to clean mold without containment or protection equipment
- Pressures you to sign immediately or claims the situation is more urgent than it is
- Quote is significantly lower than competitors without explanation
- Does not mention addressing the moisture source
- No online presence, reviews, or references
Getting Multiple Quotes
Always get at least 3 quotes for mold remediation. Prices can vary significantly. When comparing, look beyond the total price — compare the scope of work, containment procedures, materials to be removed, post-testing, and warranty terms. The lowest quote often reflects fewer steps, cheaper materials, or no post-testing.
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