Radon Mitigation Fairfax › Radon testing
Radon testing in Fairfax, VA
Certified short-term and continuous-monitor tests for home sales and peace of mind.
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What it does
A short-term test takes 48 to 96 hours with a continuous radon monitor or charcoal canister, placed in the lowest livable level under closed-house conditions. For real estate transactions in Virginia, the test must be done by a certified professional. A long-term test (90 days or more) gives the truest year-round average. If you have a result already, you do not need to retest before mitigation; the contractor uses your number as the baseline.
What is included
- 48–96 hour continuous-monitor tests
- Real-estate transaction testing by certified testers
- Long-term 90-day tests
- Post-mitigation clearance tests
Why Fairfax businesses add this
Radon is the second-leading cause of lung cancer after smoking, according to the EPA and the U.S. Surgeon General, and it has no smell or color. About one in every fifteen U.S. homes has elevated levels; in Zone 1 counties like Fairfax County the share is higher. Most Fairfax homeowners find out during a home sale, with a closing date a few weeks away and no idea which contractor to trust or what the job should cost.
What it costs
| Service | Typical cost | Notes |
|---|---|---|
| Standard sub-slab system, single suction point | $800 – $1,500 | most basements and slab homes |
| Larger or multi-point system, interior routing, high-level readings | $1,500 – $2,500 | finished basements, additions, levels above 20 pCi/L |
| Crawl-space sub-membrane system | $1,500 – $3,000 | depends on crawl-space size |
Get FREE quotes from certified Fairfax contractors
Tell us about your home. We send your request to up to three certified, independent contractors within one business day. No cost to you, no obligation.
Other services
Sub-slab depressurization, the standard fix for basements and slabs.
Radon in home salesBuyers, sellers and agents: a mitigation quote in 24 hours, installed before closing.
Crawl spaces and radon-resistant new constructionSub-membrane systems and passive-to-active upgrades.
Serving Fairfax and Vienna, Oakton, Burke, Annandale, Chantilly. Service areas →