Radon Mitigation Cost in Alabama: Full Breakdown

How much does Radon Mitigation cost in Huntsville?

For a standard slab-on-grade home in Huntsville, a radon mitigation system runs $800 to $1,500 installed. Most homeowners in Madison County pay between $1,000 and $1,300, but a crawl space or complex foundation pushes that higher.

That range covers the most common setup: an active sub-slab depressurization system. We drill a hole through your garage or basement slab, pull soil gas out with a fan, and vent it above the roofline. On a straightforward ranch house with good access, you are looking at the lower end. Two-story homes, steep roofs, or tight crawl spaces add time and material.

Nationally, Angi's 2026 data puts the average at about $1,000, with most homeowners paying $800 to $1,300. HomeGuide shows $1,200 to $2,000 on average, and the full range across home types runs $800 to $2,500. Huntsville sits right in that national band. We see a lot of slab homes in the new subdivisions off Highway 72 and in the older neighborhoods around Five Points, and they usually land between $1,000 and $1,400.

The only way to know your number is a free on-site visit. We look at your foundation, measure the radon level, and check where we can run the pipe. No two houses are identical, and a quote over the phone is a guess at best.

What affects Radon Mitigation pricing?

Your foundation type is the biggest driver. Slab homes are cheapest. Crawl spaces cost more because we install a sealed vapor barrier. Basements fall in between. Home size, number of suction points, and access also shift the price.

Foundation type is the first thing we look at. On a slab, we drill one hole, set a fan, and run a pipe. That is the simplest job. A basement is similar if the floor is poured concrete, but we might need to run the pipe up through an exterior wall. Crawl spaces are a different animal. The fix is a sub-membrane system: we lay a heavy plastic sheet over the dirt, seal it to the foundation walls, and pull the gas from under the membrane. The membrane alone runs $800 to $3,000, and full crawl space encapsulation ranges from $1,500 to $15,000 depending on size and access.

Home size matters, but not as much as you might think. A 1,200-square-foot slab house and a 2,400-square-foot slab house often take the same single suction point. The fan pulls from the whole footprint. What changes is the pipe run. A larger house might mean a longer pipe, more elbows, and more time on the roof. Two-story homes also add labor because the crew works at height.

Number of suction points is the other big variable. Most homes need one. But if the radon level is very high, or if the house has multiple foundation sections (like an addition on a different slab), we may need two or three suction points. Each point adds $300 to $600 for the extra piping and fan work.

Access is what surprises homeowners. A narrow driveway means we park on the street and carry tools and pipe by hand. A steep roof adds time and safety gear. Finished basements require us to cut drywall and patch it afterward. Those small things add up.

Radon Mitigation cost by home size

Home size matters less than foundation type, but here is what we see for slab homes in Huntsville by square footage.

The table below is for slab-on-grade homes with one suction point. Crawl space and basement homes will be higher. These are typical ranges we see on jobs in Madison County, not quotes. Your cost depends on the factors above.

Is it cheaper to do it yourself?

No. A DIY radon system is not cheaper in the long run. You might save a few hundred dollars upfront, but you risk missing the problem and having to pay for a professional fix anyway.

The idea sounds tempting. You buy a fan online for $200, grab some PVC pipe from the hardware store, and drill a hole in your slab. But radon mitigation is not just plumbing. The fan has to be sized to your home's soil permeability and the pipe has to vent above the roofline, usually 10 feet from any window or door. A fan that is too weak does not pull enough gas. A fan that is too strong can back-draft your water heater or furnace.

Then there is sealing. We seal cracks in the slab and around the sump pump. A homeowner misses those, and the system pulls air from the house instead of the soil. That wastes electricity and does not lower radon levels. We have fixed several DIY jobs where the homeowner spent $500 on parts and still had radon above 4.0 pCi/L. They ended up paying us $1,000 to redo it.

The other risk is electrical. A radon fan needs a dedicated circuit or a properly wired outlet. An unlicensed electrical job can be dangerous. Our crew includes a licensed electrician for that reason.

A professional system includes a warranty on the fan and the work. If the fan fails in year three, we replace it. A DIY fan fails, you buy another. The national average for fan replacement is $200 to $600 every 5 to 10 years. We cover that in our quote.

Common questions about Radon Mitigation cost

Here are the questions we hear most from Huntsville homeowners, with answers.

We get calls every week from people who just bought a home or are selling one. These are the questions that come up.