What Radon Mitigation Costs in 2026
National industry ranges, what actually moves the number in Chicago-area homes, and why we give you a real number only after looking.
Reviewed by Bill Dahlstrom, Illinois radon mitigation license RNM2018212.
If you are searching for radon mitigation prices, you have probably noticed that most companies either hide the subject completely or bury it under a quote form. We would rather just talk about it.
This page gives you the real national industry numbers, published by third parties and updated as they update, plus an honest explanation of what makes one home's system cost more than another's. What you will not find here is our own price list, and the reason is simple: we do not price a radon system until Bill has looked at the home.
The industry averages below will tell you the neighborhood the number lives in. The home tells us the number.
The Short Answer, From Industry Data
- Angi's 2026 cost guide puts the national average for radon remediation at about $1,000, with most projects between $800 and $1,300.
- HomeAdvisor's 2026 data shows most homeowners spending between roughly $786 and $1,274, with an average around $1,028.
- Across sources, the broad range for a complete active system often runs from about $800 to $2,500.
These are national numbers, not our quotes. National averages are dominated by the simplest version of the job: a single suction point in an unfinished basement, often in markets where labor costs less than it does around Chicago. A home with a basement plus a crawlspace, or a gravel crawlspace that needs a sealed vapor barrier, is a different job.
Industry Ranges by Type of Work
Standard sub-slab system
Roughly $800 to $2,500 nationally. One suction point at the slab or sump, piping to a fan, and a proper termination above the roofline.
Crawlspace system with sealed vapor barrier
Roughly $1,500 to $4,000 nationally, and around Chicago a gravel crawlspace realistically sits at the top of that range or above it. Homes with both a basement and a crawlspace need each area handled.
Block-wall foundation systems
Often a higher-range project because hollow block walls can need their own depressurization approach. It is one of the most involved categories.
Passive system activation
Usually the least involved active-system project because the piping was built in. Illinois has required passive radon piping in new homes since June 1, 2013.
Radon fan replacement
Angi 2026 figures put the national average around $350, with most replacements between $200 and $600. If the rest of the system is sound, a failing fan does not mean starting over.
Running the system
Radon fans typically run continuously. At typical electric rates, many systems land around $60 to $125 per year in electricity, plus a small amount of conditioned air pulled from the home.
What Actually Moves the Number
- Foundation combination. A home with both a basement and a crawlspace gets a suction point for each area.
- The routing path. Through the garage and garage attic, through the home and out the roof, or out the side and up past the roofline.
- What is under the slab. How well air moves beneath the concrete decides how much suction the system needs.
- The sump situation. Sealing a sump lid while keeping the pump serviceable is routine, but the pit location and condition shape the design.
- A finished basement. Finished space makes routing choices matter more because nobody wants pipe through the middle of a finished family room.
- Fan sizing. Bigger homes, tighter sub-slab material, or multiple suction areas can call for a stronger fan.
How We Price, in Plain Terms
Bill looks at the home first, then prices. We do not price sight unseen because guessing is how homeowners end up with surprise add-ons.
The price is stated before any work begins. The price we give you before work begins is the price, unless you ask us to change the scope.
No trip charge, in any of our service areas.
If the home already has a system and the problem is just the fan, we say so. A fan replacement visit is a normal call for us, not a downsell.
Comparing Quotes
- Is the company state licensed for mitigation in Illinois? Ask for the license number. Ours is RNM2018212.
- Does the design give every foundation area its own suction point?
- Where does the pipe run, and what will it look like from the street?
- Is the fan sized to the home, or is it whatever was on the truck?
- Does the system include a manometer so you can see it working?
- If a real estate closing is involved, will the paperwork be ready when the file needs it?
Want to Know What Your Home Actually Needs?
Send your info and we'll help you figure out the next step, or call or text Bill at (815) 370-9682. You do not need your test number handy. No trip charge.
Radon Mitigation Cost Questions
Why is there no exact price on this page?
Because we have not seen your home yet, and any number we published without looking would be a guess dressed up as a promise. The industry ranges above are real third-party data and they frame the conversation honestly. Bill looks first, then prices, and the price is stated before work begins.
What makes one home's system cost more than another's?
Mostly foundation layout. A home with a basement plus a crawlspace needs each area handled, a crawlspace needs a sealed vapor barrier, and hollow block walls need their own approach. Routing length and fan sizing do the rest. The home style matters more than the home price tag.
How much does it cost to run a radon fan?
Radon fans typically run around the clock, which often works out to roughly $60 to $125 per year in electricity at typical rates, plus a small amount of conditioned air pulled from the home. A correctly sized fan keeps that as low as the design allows.
The fan died on a system we already have. Is that a whole new system?
Usually not. If the piping and design are sound, replacing the fan brings the system back, and Angi 2026 national figures put most fan replacements between $200 and $600. We service existing systems, including systems other installers put in.
We are closing soon. Does a deadline change the price?
No. A closing date changes scheduling and paperwork priorities, not what the system costs. Tell us the date up front and we will be straight with you about what is realistic.
Why do Chicago-area quotes come in higher than the averages I found online?
Because the national average describes a simpler job than many homes here need. Averages are pulled down by one-suction-point basement installs in lower-cost labor markets. This area has many combination layouts, basements with adjacent crawlspaces, split-levels with sub-basements, and gravel crawlspaces that need full encapsulation before a system can work.
Are online cost calculators accurate for this area?
Treat them as ballparks. They lean on national single-foundation averages, and those drift furthest from real quotes on exactly the layouts this area is full of. The ranges above plus the crawlspace warning will get you closer than a calculator.
Related radon guides
What to Expect During Install
How a mitigation visit usually works once Bill has looked at the home.
Radon Fan Replacement & System Repair
What to do when an existing fan is loud, silent, vibrating, or no longer pulling.
Radon System Inspection & Checkup
A practical checkup for visible components on an existing system.
Passive Radon System Activation
For newer homes that already have passive radon piping in place.
Helpful official radon resources
- Angi radon remediation cost guide, 2026
National cost guide for radon remediation ranges and cost factors.
- HomeAdvisor radon mitigation cost guide, 2026
National active and passive radon mitigation cost ranges.
- Angi radon fan replacement cost guide, 2026
National radon fan replacement averages and range by fan type.