Preferred Home Inspections
Verified Pro
7+ years online5.0(327)
Radon Mitigation in Wilmington, DE
Compare 25 radon mitigation contractors near you in Wilmington and surrounding area with an average rating of 4.7/5. Get free quotes, read reviews, and find the right pro for your project.
Last updated March 23, 2026
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Verified Pro Installers
preferredinspectionsde.com
Reliable Home Inspection Service
Verified Pro
~19 years online5.0
Safe Shelter Environmental
Verified Pro
28½+ years online4.8
SWAT Radon Mitigation
Verified Pro
12+ years online4.8
Quality Home Inspections
Verified Pro
18+ years online4.7
Other Businesses in This Area
J T Quinn Contractor & Radon
Radon Specialists
~12 years onlineAnvil Radon
5.0A-Pro Home Inspection Wilmington
5.0~16 years onlineAtlantic Radon Systems Inc
5.0~19 years onlineReal Estate Inspections
5.013½+ years onlineThe Radon Bros
5.02+ years onlinePro-Spect Inspection Services PA
4.93½+ years onlineRadon Technology & Enviromental
4.911½+ years onlineSERVPRO of Brandywine / Wilmington
4.929+ years onlineRadon-Rid, LLC
4.719½+ years onlineFran the Radon Man, LLC
4.610+ years onlineDelvalley Home Inspections
4.224½+ years onlineCertified
3.73½+ years onlineAtlantic Radon Systems
1.0Radon Mitigation in Nearby DE Cities
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Radon Mitigation in Wilmington, DE
Wilmington radon mitigation specialists in this directory cover Trolley Square, Greenville, Brandywine Hundred, and central Wilmington. Delaware falls in EPA Radon Zone 1 (highest risk) — most New Castle County homes test elevated and require mitigation. Sub-slab depressurization on a typical Wilmington basement home runs $1,400-$2,800 installed. Crawlspace systems with vapor barrier and active vent run $2,400-$4,000.
Delaware Department of Natural Resources publishes county-by-county radon zone maps showing New Castle County in Zone 1. Real-estate transactions in Delaware almost universally include radon testing — most buyers expect a 48-hour test and may negotiate mitigation as a contingency.
Frequently Asked Questions
- Do most Wilmington homes have radon issues?
- Yes — Delaware is EPA Zone 1, and the majority of New Castle County homes test above the 4 pCi/L EPA action level. Test before buying and consider mitigation pre-emptively if your test returns 2-4 pCi/L (sub-action but still elevated).
- How long does Wilmington radon mitigation install take?
- Sub-slab depressurization is a 1-day job for most basement homes. Post-mitigation testing (48-hour follow-up) confirms levels below action limit. Total turnaround is typically 3-5 days from contract to verified result.
- What about radon in Wilmington crawlspaces?
- Crawlspaces require sealed vapor barrier (12-20 mil), sealed perimeter, and active sub-membrane vent fan. Cost runs $2,400-$4,000 for a typical footprint. Encapsulation pairs well with mitigation and addresses both radon and humidity.
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