Here's the number most Chattanooga homeowners are looking for: a residential radon mitigation system in Hamilton County typically runs $900 to $2,500, with the majority of straightforward jobs landing between $1,200 and $1,700. Large-footprint homes, houses with additions, or properties that need more than one suction point can run higher. That's the honest range — anyone quoting you a firm price over the phone before they know what's under your house is guessing.
The standard fix is active sub-slab depressurization. A sealed suction point is cut into the slab, PVC piping carries the soil gas up and out above the roofline, and a continuously running inline fan keeps the area under your foundation at slightly negative pressure so radon never enters the house. Add a u-tube manometer so you can confirm the system is running at a glance, plus sealing of the obvious entry routes, and that's the whole job. Materials are a modest share of the price; the rest is diagnostics, labor, and the design judgment that decides whether the system actually works.
Foundation type is the biggest single factor. A basement with good sub-slab gravel is usually the cleanest and cheapest install — one suction point often treats the whole footprint. A slab-on-grade home in Ooltewah or East Brainerd can be similar, though poor sub-slab communication sometimes forces a second point. Crawlspaces cost more, because the fix is a sealed vapor barrier with sub-membrane suction: more material, more labor crawling it in, and careful sealing at piers and walls. Mixed foundations — a basement plus a crawlspace addition, common on the older houses in Red Bank, St. Elmo, and North Chattanooga — often need two systems or a tied-together design.
Your radon level matters less than people expect, but it isn't nothing. A house at 25 pCi/L needs more airflow than one at 5.2, which can mean a larger fan and, occasionally, an extra suction point. Fan sizing should follow measured airflow, not a catalog default — an undersized fan won't hit the number and an oversized one is loud and wastes electricity. Routing and aesthetics are real cost items too: an interior run through a closet chase into the attic hides the pipe completely but takes longer than a straight exterior run up the side of the house. Either works; you pick. Sealing of sump pits, floor-wall joints, and slab cracks is included on our jobs, but on a badly cracked slab it adds time.
Radon systems fail quietly. The fan hums, the pipe looks fine, and the house is still at 6.0 because the suction point was placed where the sub-slab gravel doesn't communicate, the sump was never sealed, or the fan was too small for the soil. Now you're paying a second contractor to re-do the work — and you've lived with elevated levels in the meantime. A bid that skips the diagnostic visit, doesn't include the post-installation retest, or doesn't put a guaranteed level in writing is not a cheaper system. It's an unfinished one.
Two things belong in every quote. First, a post-mitigation verification test that documents the new level in writing — without it, nobody knows whether the system worked. Second, a guaranteed result: our systems are guaranteed to bring the home below the EPA action level of 4.0 pCi/L, and most finish under 2.0. If yours doesn't, we come back. That guarantee is also what makes the price comparable between bids — otherwise you're comparing a fixed outcome against a hopeful one.
East Tennessee's Valley and Ridge geology — fractured limestone and shale under Signal Mountain, Lookout Mountain, and Missionary Ridge — puts Hamilton County in the EPA's elevated radon zone, and a meaningful share of local homes test above 4.0. Radon is the leading cause of lung cancer among people who never smoked, and risk accumulates with every year of exposure. Against that, a one-day, one-time $1,500 fix is cheap. It also travels well: a documented system is a clean answer when a buyer's inspector raises radon at your next closing.
We quote fixed prices in writing after seeing the foundation — no allowances, no change orders. If you don't have a result yet, start with a certified radon test; the fee is credited toward the system if you need one. If you already know your number, we'll quote from it and walk you through how the system will be built. Call (423) 529-4385 for a free, straight answer on what your home will cost — same-business-day response across Chattanooga, Hixson, East Ridge, Soddy-Daisy, Ooltewah, and North Georgia.
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