Radon Contractors in Seattle, WA

Compare 17 radon testing & mitigation contractors in Seattle.

Radon Contractors in Seattle

Seattle Foundation Repair

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Seattle Foundation Repair Group specializes in foundation repair, concrete lifting, basement waterproofing, and crawl space encapsulation throughout Washington State. They address issues like sinking foundations, cracked walls, and structural problems using modern construction techniques.

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Premier Masonry & Waterproofing

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Premier Masonry & Waterproofing is a Seattle-based contractor specializing in comprehensive waterproofing, foundation repair, and masonry services to protect homes from water damage and structural issues in the Pacific Northwest.

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Embassy Masonry And Foundation Repairs

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Embassy Masonry and Foundation Repair provides expert foundation repairs, waterproofing, masonry, and concrete services for Seattle properties. They specialize in addressing structural issues, water intrusion, and exterior restoration with high-quality workmanship and tailored repair strategies.

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Seattle Mold Solutions

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Seattle Mold Solutions is a professional mold removal company specializing in attic and crawl space mold remediation for residential, apartment, and commercial properties. With 1,000+ successful projects since 2005, they provide safe and effective mold removal using advanced techniques.

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Expert Masonry and Foundation Repairs

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Expert Masonry & Foundation Repairs is a licensed and insured contractor specializing in roofing, masonry, basement, foundation, drainage, and waterproofing services for residential properties in Seattle. They combine old-school craftsmanship with modern design to deliver high-quality property repairs and rebuilds.

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Gravity Waterproofing and Drainage

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Gravity Waterproofing is a Seattle-based waterproofing and drainage specialist with over 15 years of experience protecting homes and businesses from water intrusion and moisture damage using advanced customized solutions tailored to the Pacific Northwest climate.

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Seattle Mold And Restoration Service

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Seattle Mold And Restoration Service provides professional mold remediation, flood restoration, fire damage restoration, air duct cleaning, and exterior painting services to restore homes to a healthy and beautiful condition.

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KG Basement Waterproofing Seattle

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KG Basement Waterproofing Seattle specializes in basement waterproofing, foundation repair, and crawl space encapsulation for homeowners in the Seattle area. They provide solutions to prevent water damage and mold while ensuring homes remain dry and structurally sound.

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Seattle 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.

What to Expect

Crawl space encapsulation in the Seattle 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.

Coverage Areas

Seattle-area contractors typically serve surrounding communities within a 30–50 mile radius.

Frequently Asked Questions

How much does radon mitigation cost in Seattle?

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 Seattle.

What are the radon levels in Seattle?

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.

Do I need a radon test when buying a home in Seattle?

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.

How do I choose a radon contractor in Seattle?

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.

Offer Radon Services in Seattle?

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