Compare 28 radon testing & mitigation contractors in St. Louis.
Woods Basement Systems is an authorized Basement Systems contractor providing basement waterproofing, crawl space encapsulation, and foundation repair services. They help homeowners protect against moisture, mold, rot, and structural issues.
Mold Solutions is a locally owned and operated mold inspection, remediation, and prevention company serving the St. Louis and Chicago areas since 2008, offering safe and effective mold removal with guaranteed results.
Water, fire, and mold damage restoration company providing emergency cleanup, remediation, and reconstruction services in Central St. Louis with 24/7 availability.
AWA Environmental provides expert mold inspections, asbestos testing, and environmental hazard detection services in St. Louis, Missouri. They specialize in identifying indoor air quality issues and environmental contaminants to ensure property safety.
SERVPRO of Affton/Webster Groves is a 24/7 emergency restoration and cleaning company specializing in water damage, fire damage, mold remediation, and storm cleanup for residential and commercial properties in the St. Louis area.
SERVPRO of St. Louis Central provides 24/7 emergency cleaning, restoration, and construction services for residential and commercial properties affected by water damage, fire, mold, and disasters.
Spray foam insulation contractor in St. Louis specializing in residential and commercial insulation installation. They provide spray foam insulation services that create air-tight seals and improve energy efficiency.
The Flood Team is a water damage restoration company that provides swift water cleanup, drying, flood prevention, and mold remediation services for homes and businesses. They specialize in water extraction, structural drying, and insurance claims assistance.
Midwest Flood Restoration provides 24/7 water damage restoration services in St. Louis and surrounding areas, handling water extraction, drying, and complete property restoration from flooding, burst pipes, sewage damage, and other water emergencies.
Koala Insulation of St. Louis is a premier insulation contractor specializing in residential and commercial insulation installation, removal, and energy efficiency solutions. They provide spray foam, blown-in, batt insulation, air sealing, and crawl space encapsulation services to enhance home comfort and reduce energy costs.
Thornburgh Companies is a multi-service contractor providing mechanical insulation, asbestos and lead abatement, painting, and fire stopping solutions since 1987. Fire Stop Technologies, established in 1994, specializes in firestopping systems and fire-resistant coatings.
Gateway Waterproofing & Restoration is a Saint Louis-based company specializing in commercial and residential waterproofing and restoration services with a commitment to expert craftsmanship and safety.
Jet Foundation Repair is St. Louis' only 100% employee-owned foundation repair company providing engineer-led structural solutions for foundations, basements, and crawl spaces with transparent pricing and comprehensive warranties.
Claro provides complete mold remediation and testing services for St. Louis homes using dry-fog technology to eliminate mold spores throughout the entire home without demolition or downtime.
Family-owned insulation and roofing contractor serving the Saint Louis, Missouri Metropolitan Area for over 30 years, specializing in insulation installation and roofing services for homeowners and general contractors.
West County Insulation is an energy-efficient insulation contractor serving St. Louis and St. Charles, Missouri, providing residential and commercial insulation services including attic, wall, and blown-in insulation installation and removal.
St. John Environmental Consulting provides hazardous materials testing and inspection services for homes, businesses, and commercial structures, specializing in asbestos, lead paint, mold, PCBs, and meth detection.
Gateway Home Services is a licensed and insured handyman and property maintenance company offering residential and commercial repair, replacement, and installation services in the St. Louis area. With over 30 years of experience, they provide comprehensive solutions for homes and businesses.
St Louis Mold Remediation Solutions provides professional mold removal and remediation services for residential and commercial properties in the St. Louis area. They specialize in comprehensive mold eradication, water damage restoration, and indoor air quality improvement.
Crawlspace Medic of St. Louis provides expert crawl space encapsulation, basement waterproofing, vapor barriers, and dehumidifier installation to protect St. Louis homes from moisture damage and mold growth.
St. Louis Foundation Repair & Waterproofing provides comprehensive foundation repair, crawl space services, and waterproofing solutions for residential and commercial customers in St. Louis, MO. They specialize in foundation inspections, crack repair, leveling, and moisture control.
Certified Waterproofing Inc. specializes in basement waterproofing, foundation repair, and tuckpointing services for homes, with expertise in older and historical St. Louis properties since 1888.
Metal building insulation experts providing custom-laminated, UL certified fiberglass insulation systems and related products for commercial and industrial applications.
Fast Help is a 24/7 disaster recovery specialist in St. Louis providing water damage restoration, fire restoration, and mold remediation services with 60-minute response times.
Fred's Foundation Repair & Waterproofing is a locally-owned, family-run company providing affordable basement waterproofing and foundation repair solutions tailored to St. Louis homes and local soil conditions.
St. Louis homeowners face common crawl space and foundation challenges driven by local soil and climate conditions. Moisture control, encapsulation, and structural repair are among the most-requested services.
Crawl space encapsulation in the St. Louis area typically ranges from $5,000–$15,000 depending on square footage and moisture severity. Foundation repair costs vary widely based on the scope of work. Get multiple quotes from verified contractors.
St. Louis-area contractors typically serve surrounding communities within a 30–50 mile radius.
The national average for radon mitigation is around $1,200, with most systems costing $800–$2,500. Get quotes from contractors above for accurate local pricing in St. Louis.
Radon levels vary by neighborhood and even by home. The only way to know your home’s radon level is to test. The EPA recommends testing every home, regardless of geographic zone. If your home tests at or above 4 pCi/L, mitigation is recommended.
Yes. The EPA and most real estate professionals recommend radon testing during every home purchase. Many states require radon disclosure at sale. A short-term professional test (48–96 hours) is standard during the inspection period. If levels are elevated, mitigation can often be negotiated as a seller concession.
Look for contractors with NRPP or NRSB certification — these are the national credentials recognized by the EPA. Ask about their specific system design, warranty terms, and whether they include a post-mitigation re-test. Get at least 2–3 quotes.
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