What Radon Mitigation Costs on the North Shore (2026 Guide)
Here are the numbers most North Shore homeowners are working with: a radon mitigation system runs $800 to $2,500 installed, with typical single-family jobs in Northbrook, Glenview, Wilmette, and Evanston landing around $1,200 to $1,500. Testing, the step that tells you whether you need any of this, runs from free to a couple hundred dollars. The rest of this guide walks through what moves an install toward either end of the range, why our area's housing stock shapes the price, and the two places homeowners waste money on radon.
Why the range is $800 to $2,500
Every mitigation system is the same idea — a suction point under the slab, a PVC pipe, an inline fan, a discharge above the eave — and the EPA's radon guidance has recommended this "active sub-slab depressurization" approach for decades because it fixes the pressure problem that pushes soil gas indoors in the first place. The cost spread comes from how hard that idea is to execute in your specific house:
Foundation type. A single poured slab with good gravel under it is the easy case: one suction point, strong airflow, low end of the range. Older foundations — and in Wilmette, nearly a third of homes predate 1940 — often mean compacted or rubble fill that needs a second suction point, or a combination basement-plus-crawlspace footprint where the crawl gets its own sealed membrane. Each addition adds a few hundred dollars.
Pipe routing. The cheapest route is straight out the rim joist and up the exterior wall. The tidiest route runs inside — through a garage or closet chase into the attic, fan in the attic, discharge through the roof — and costs more in labor. On vintage facades and in Evanston's historic districts, the interior route is often worth it; on a 1960s Northbrook ranch, the exterior run painted to match is usually fine.
Sump and drain-tile details. A home with a sump pit often gets suction through a sealed sump lid, using the drain tile as a ready-made collection network — efficient, but the lid, seal, and pit condition add line items. Homes with high water tables need the radon fitting and the pump to coexist properly.
What testing costs, including free
Short-term charcoal kits run $15 to $50 retail, and the Cook County Department of Public Health gives suburban residents free short-term kits — a legitimate first look at your number if you place the kit correctly and keep the house closed up. A professional measurement with a continuous monitor costs more and is the right tool when the result has to hold up: a real estate deal, a post-mitigation verification, or a decision you're about to spend four figures on. Our testing page covers the methods; the short version is that the house, not the device, does most of the work — 48 hours minimum, windows shut, device in the lowest lived-in level.
Worth the reminder while you're deciding whether to test at all: per IEMA data compiled by the Respiratory Health Association, nearly 30% of Cook County homes tested by licensed professionals come back at or above the EPA's 4.0 pCi/L action level. This is not a rare finding.
The two ways people waste money on radon
Re-testing in search of a lower number. Radon swings with weather and season, so a homeowner who dislikes a 6.0 can usually find a 3.5 eventually — in summer, with a different kit. That's not information, that's shopping for an answer. One valid closed-house test, or a short-term test confirmed by a long-term one, is all the certainty the decision needs.
Unlicensed work. Illinois has licensed radon professionals since 1998, and the state radon program requires a tag on every installed system with the installer's name and license number. A handyman quote without a license behind it isn't a discount — you lose the required tag, the protocol-grade verification test, and the paper trail that counts at resale. You can check any license in the state's public lookup before hiring anyone, including the pros we refer.
Why North Shore houses skew toward needing this
Illinois has required passive radon-resistant construction in new homes only since June 2013. Around here that rule barely touches the housing stock: roughly four in five Northbrook homes predate 2000, about nine in ten Glenview homes predate 2010, and Evanston is 40% pre-1940. Decades of settling, retrofitted sump pits, and original slab penetrations are the entry points a mitigation system exists to beat.
The bottom line
Test first — free or cheap. If the number comes back at or above 4.0, budget $1,200 to $1,500 for a typical install, $800 if your house is the easy case, up to $2,500 if it's the complicated one, and insist on the license tag and the verification test. If you're weighing this during a home sale, timing changes the strategy more than price does; that's covered in our guide to how radon testing fits a North Shore real estate deal. And when you want a firm number for your specific house, tell us what you've got.