If your radon test came back at 4 pCi/L or higher, the next question is almost always what it will cost to fix. This page breaks down what goes into a radon mitigation price for a Huntsville or Madison County home, which features push it up or down, and how to compare quotes. We're a referral service, not a contractor, so we don't set prices. The numbers below are published national figures, framed as typical ranges, so you can tell whether a quote is in the normal neighborhood.
The short answer
Angi's 2026 cost data, drawn from 1,184 verified projects, puts a typical active suction radon system at about $805 to $1,326, with an average around $1,043. That's the fan-and-pipe system certified mitigators install in most homes. Angi's same report lists separate budget lines that often come with it:
- Radon testing: about $150 to $700 for professional testing
- Permits, where required: about $25 to $150
- An electrician, if the fan needs a new circuit: about $50 to $100 an hour
- Extended warranties: about $200 to $500
- Ongoing energy use: about $100 to $300 a year
Angi also reports city averages ranging from about $700 in lower-cost markets to $2,000 in the most expensive ones, with Atlanta, the closest metro on its list, around $1,100. Huntsville isn't on that list, so treat those as context only. The real number comes from a professional who has looked at your foundation.
What you're actually paying for
A standard system has a short list of parts: a suction hole cored through the slab (or a sealed membrane in a crawl space), schedule 40 PVC pipe, an in-line radon fan mounted in the attic or outside, a manometer that shows the system is pulling suction, and sealing at accessible cracks and openings. The materials are a modest share of the bill. Most of the price is skilled labor, diagnostics, and the installer's warranty and post-mitigation testing.
A careful installer will often run a quick diagnostic before quoting, drilling a small test hole and measuring how well suction spreads under the slab. That step is what lets them choose the fan size and the number of suction points, and it's the single best predictor of whether the first design will work.
Why one Huntsville house costs more than another
Foundation type
Huntsville has all three common foundations. Newer slab-on-grade homes in Madison, Harvest, and along the Highway 72 corridor are usually the simplest. Mid-century ranches in central and south Huntsville often sit on crawl spaces, which need a sealed membrane priced by square footage. Hillside basement homes on Monte Sano, Green Mountain, and in Hampton Cove can need more sealing and sometimes more than one suction point. Homes that mix a slab addition with an original crawl space may need both approaches tied into one fan.
What's under the slab
Clean gravel under a slab lets one suction point reach a large area. Tight clay soils, common across the Tennessee Valley, resist airflow and may call for a stronger fan or a second suction point. That's why two houses of the same size on the same street can get different quotes.
Pipe routing
Running the pipe inside through a closet or garage into the attic takes more labor but keeps the outside of the house clean. An exterior route up a side wall is often faster and less expensive. Many Huntsville homes with attached garages get a garage route, which is a common middle ground.
Electrical work
The fan needs power. If there's an outdoor-rated outlet or an attic circuit nearby, that's simple. If not, a new circuit adds cost.
Finished spaces and size
Finished basements, built-ins, and large footprints all limit where a suction point can go or add pipe. Angi's data adds roughly $500 to $1,500 for larger homes.
Costs that should not be in a radon quote
Be wary of a quote that bundles in things you didn't ask for. Full crawl space encapsulation for moisture is a separate, larger project (Angi lists it at about $1,500 to $15,000 when needed). It can be combined with radon suction, and sometimes should be, but you should see it as its own line item. Same goes for air purifiers or sealing-only packages sold as a radon fix. Sealing alone isn't a reliable way to bring radon below the action level.
How to compare two radon quotes
- Check that both quotes describe the same design: number of suction points, fan model, and pipe route.
- Confirm who does the post-mitigation test and when. It should start at least 24 hours after the fan is turned on.
- Look for a written reduction guarantee, usually a result below 4 pCi/L, and what happens if the retest is high.
- Compare warranties on the fan and on labor.
- Ask whether permits and any electrical work are included.
- Ask for NRPP or NRSB certification. Alabama doesn't license radon contractors, so national certification is the main quality check.
Budgeting for a home sale
If radon turns up during a purchase, the cost of a typical system gives buyers and sellers a sense of scale when they negotiate a repair or a credit. Our real estate radon guide covers timing and who usually pays. If you're building instead of buying, see radon-resistant new construction, where the parts cost far less to add before the slab is poured.
Frequently asked questions
How much does radon mitigation cost in Huntsville?
There's no single local price. As a typical national range, Angi's 2026 data puts an active suction radon system at about $805 to $1,326, averaging about $1,043. Larger homes, crawl spaces that need a full membrane, and extra suction points cost more. A certified professional quotes your house after looking at it.
Is a crawl space system more expensive than a slab system?
Usually. Crawl space systems need a sealed plastic membrane over the soil, priced largely by area, plus the work of installing it in a tight space. A plain slab with good gravel underneath is typically the simplest job.
What does a radon system cost to run each year?
The fan runs 24/7. Angi estimates energy costs at roughly $100 to $300 a year, which includes electricity and the small amount of conditioned air some systems pull from the house. Ask for the fan's wattage to estimate your own number.
Do I need a permit for a radon system in Huntsville?
It depends on the jurisdiction and the electrical work involved. Angi's national data puts permits at about $25 to $150 where they're required. Ask your installer whether a permit is needed at your address and whether it's included in the quote.
Should I pay for a radon test before getting quotes?
You need a reliable result first. A do-it-yourself kit is a low-cost first screen, but a confirmed high result or a real estate deadline is a good reason to use a certified measurement professional.