Radon Contractors in Seattle, WA

17 radon mitigation and testing specialists serving Seattle and the surrounding area — residential and commercial properties.

EPA action level: 4 pCi/L · NRPP/NRSB certified professionals · Residential & commercial radon services

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Hawk Environmental Services

7955 46th Ave S, Seattle, WA 98118, USA

5.0(90 reviews)

(206) 620-0311

Pillar To Post Home Inspectors - David McPhee

10002 Aurora Ave N # 36 / 2207, Seattle, WA 98133, USA

5.0(18 reviews)

(206) 522-5141

Green River Abatement

3645 Auburn Way S, Auburn, WA 98092, USA

5.0(41 reviews)

(206) 941-1281

Robinson Restoration - Seattle

21120 77th Ave S, Kent, WA 98032, USA

4.9(280 reviews)

(206) 289-0140

5 Microns Inc. Asbestos, Mold, Drinking Water, Radon, Air Quality Testing Lab

7100 Fort Dent Way # 100, Tukwila, WA 98188, USA

4.9(136 reviews)

(425) 440-8787

Fischer Restoration

6608 220th St SW #120, Mountlake Terrace, WA 98043, USA

4.9(155 reviews)

(206) 633-2065

Mountains to Sound Home Inspection

1101 Kentish Rd, Lynnwood, WA 98036, USA

4.9(480 reviews)

(253) 344-4714

Environix

3731 132nd St SW, Lynnwood, WA 98087, USA

4.9(396 reviews)

(425) 243-3859

Attic Projects

6839 S 220th St, Kent, WA 98032, USA

4.9(780 reviews)

(425) 516-1055

BluSky Restoration Contractors

1000 SW 34th St Suite H, Renton, WA 98057, USA

4.8(31 reviews)

(425) 656-0500

Environment Control North Seattle Restoration Services

7116 220th St SW #11, Mountlake Terrace, WA 98043, USA

4.8(99 reviews)

(425) 967-5013

SERVPRO of Seattle NE

12570 33rd Ave NE, Seattle, WA 98125, USA

4.8(28 reviews)

(206) 362-9295

SERVPRO of West Seattle and Burien

4700 42nd Ave SW Suite 535, Seattle, WA 98116, USA

4.8(19 reviews)

(206) 932-9033

Pacific Northwest Inspections Group

1645 140th Ave NE Ste. A4 #1180, Bellevue, WA 98005, USA

4.7(51 reviews)

(425) 608-9553

Hera Environmental Laboratories

1879 Old Cuthbert Rd STE 1, Cherry Hill Township, NJ 08034, USA

4.7(58 reviews)

(856) 429-5200

Crawl Pros

10733 A St S Unit A-1, Tacoma, WA 98444, USA

4.6(279 reviews)

(253) 753-1997

SERVPRO of Downtown Seattle

900 Lenora St, Seattle, WA 98121, USA

4.6(38 reviews)

(206) 282-9500

Commercial Radon Services in Seattle, WA

Radon is not just a residential concern. Office buildings, schools, warehouses, retail centers, and multi-family complexes in Seattle are all subject to radon intrusion through concrete slabs, block foundations, and crawl spaces. Commercial radon mitigation in Seattlefollows EPA large-building protocols, requires certified measurement professionals, and involves mitigation systems scaled to the property's square footage and occupancy type.

Commercial Testing

Multi-point alpha track or continuous electronic monitor deployment across all occupied zones per EPA large-building protocol. Required for OSHA compliance and real estate due diligence in Seattle.

Commercial Mitigation

Sub-slab depressurization systems, crawl space encapsulation, and HVAC-integrated ventilation upgrades sized for commercial square footage. Seattle contractors handle buildings from small suites to large industrial properties.

Monitoring & Certification

Post-mitigation verification, ongoing radon monitoring systems, and certification documentation for property managers, lenders, and insurers in Seattle and the surrounding WA region.

Commercial Radon FAQ — Seattle

What is commercial radon mitigation in Seattle?
Commercial radon mitigation in Seattle involves installing sub-slab depressurization systems, crawl space encapsulation, and ventilation upgrades in office buildings, warehouses, schools, retail spaces, and multi-family units. Commercial systems are scaled to the building's square footage and HVAC layout — they differ significantly from residential systems in design, permitting, and ongoing monitoring requirements.
How is commercial radon testing different from residential testing?
Commercial radon testing in Seattle, WA typically follows EPA protocols for large buildings (EPA 402-K-93-001), which require multiple test devices per floor and longer measurement periods than home tests. Certified radon measurement professionals deploy long-term alpha track detectors or continuous electronic monitors across all occupied and sub-occupied zones.
Which Seattle radon contractors handle commercial buildings?
Several radon contractors serving Seattle hold NRPP or NRSB commercial certifications for large-structure mitigation and testing. Contact the specialists listed on this page to confirm commercial service availability, as some firms specialize exclusively in residential properties.
What radon level triggers mitigation in a commercial building?
OSHA and the EPA both recommend action at or above 4 pCi/L for occupied commercial and industrial spaces. Many Seattle property managers choose to mitigate at 2–3 pCi/L to stay well below regulatory thresholds and reduce liability exposure. Schools and healthcare facilities often target sub-2 pCi/L levels.
How much does commercial radon mitigation cost in Seattle?
Commercial radon mitigation systems in Seattle typically range from $1,500 for small retail suites to $25,000+ for large industrial or multi-story buildings. Cost depends on slab area, number of sub-slab suction points, existing HVAC infrastructure, and post-mitigation verification testing. Request quotes from multiple licensed contractors listed on this page.

Need commercial radon mitigation or testing in Seattle? Contact the certified specialists listed above. Confirm commercial availability when scheduling — some contractors serve residential clients only.