Last updated 2026-07-17
If your test came back at 4 pCi/L or higher, the fix is more routine — and usually cheaper — than most homeowners expect. Here’s what mitigation costs in New Jersey, what you’re paying for, and how to make sure the system actually did its job.
| Scenario | Typical cost |
|---|---|
| Standard single-family home, basement or slab | $800–$2,500 |
| Most straightforward installs | $1,000–$1,800 |
| Complex homes (multiple foundations, finished spaces) | $2,000–$3,500 |
| Each additional suction point | +$200–$400 |
| Crawl-space membrane system | Adds materially to base price |
| Fan electricity | $30–$75 per year |
| Fan replacement (every 10–15 years) | $150–$300 |
These figures line up across NJ-specific contractors and national 2025–2026 cost guides. New Jersey sits in EPA’s highest radon-potential zone, so the market here is competitive and installers see every foundation type — get two or three written quotes and the pricing spread is usually modest.
Almost every residential system in New Jersey is some form of active sub-slab depressurization (SSD). The concept is simple: radon enters because the soil under your slab is at slightly higher pressure than your basement. An SSD system reverses that.
The installer drills a hole through the slab, excavates a small suction pit, and runs PVC pipe from that point up through the house (or along an exterior wall) to a roofline discharge. An inline fan runs continuously, pulling soil gas from under the slab and venting it above the roof, where it dilutes to harmless outdoor concentrations. A U-tube manometer on the pipe shows at a glance that the fan is maintaining suction.
A standard quote should include labor, materials, the fan, piping, sealing of major slab openings (sump lids, large cracks), electrical connection, and a post-mitigation test.
New Jersey prohibits businesses from performing radon mitigation without NJDEP certification (N.J.A.C. 7:28-27) — mitigation certification is separate from measurement certification, and both the business and the individual specialist must hold credentials. Homeowners can legally work on their own house, but for anyone you hire, verify certification through the NJDEP Radon Program before signing a contract. Certified businesses also have reporting obligations to the state, which keeps the industry’s results auditable.
A system that’s installed isn’t the same as a system that works. Follow EPA’s sequence:
Most well-designed systems land comfortably below 4 pCi/L; EPA notes that getting below 2 pCi/L is achievable in many homes but harder to guarantee. A reputable NJ installer will state a target level in writing.
Radon causes about 21,000 U.S. lung cancer deaths a year per EPA — the second-leading cause of lung cancer overall and the leading cause among people who’ve never smoked. Against that, a one-time $1,000–$1,800 fix with $30–$75 a year in running costs is one of the cheaper serious-risk reductions you can buy for a house. It also converts cleanly at resale: a documented system with a passing post-mitigation test answers the radon question before a buyer asks it.
Most standard installations in NJ run $800–$2,500, with the majority of straightforward jobs landing between $1,000 and $1,800. Complex homes — multiple foundations, crawl spaces, finished basements needing hidden pipe runs — can reach $2,000–$3,500.
Yes. Sub-slab depressurization is a mature, well-understood fix, and a properly designed system typically brings homes below the 4 pCi/L action level; many end up below 2 pCi/L. The post-mitigation test is how you confirm it worked in your house.
New Jersey requires radon mitigation businesses and the professionals doing the work to be certified by the NJDEP Radon Program — mitigation certification is separate from measurement certification. Verify any contractor through NJDEP (800-648-0394 or njradon.org) before signing.
EPA guidance says test within 30 days of installation, but no sooner than 24 hours after the fan has been running. The installer will usually test, but EPA recommends an independent follow-up measurement too — by you or a separate certified tester — to remove any conflict of interest. Then retest at least every two years.
The fan draws power continuously — typically $30–$75 a year in electricity. Fans last roughly 10–15 years and cost about $150–$300 to replace, parts and labor. There is no other routine maintenance beyond glancing at the system's pressure gauge occasionally.
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