Cost calculator
Radon Mitigation Cost Calculator
Estimate what a radon mitigation system should cost for your house, using the figures state health departments and extension services publish, then see what the fan costs to run and what your state requires of the installer.
Use the result wisely
What this estimates
- Installed cost from 7 public sources, placed for your foundation, suction points and pipe route.
- Fan electricity from rated watts and your electricity price.
- Fan replacement and retest costs over 10 years.
- Your state’s mitigator licensing rule and radon office.
A planning range, not a quote. A licensed or certified mitigator’s diagnostic test sets the real design and price.
The short answer
A radon mitigation system usually costs $900–$2,500 installed, the typical range across 7 state health department and university extension sources (the full spread is $750–$3,000; Minnesota and Colorado quote up to $3,000). Most homes need one suction point and one fan. Crawl-space membranes, extra suction points, mixed foundations and pipe routed up through the house push a job toward the top. After that, a standard 66-watt fan uses about 578 kWh a year, roughly $106 at the US average electricity price, and EPA puts a fan replacement at $200–$350.
Has a radon result at or near 4 pCi/L? Check what your radon number means and EPA's next step before you price a system.
Sources: Minnesota Department of Health; Colorado Department of Public Health and Environment; Wisconsin Department of Health Services; University of Georgia Cooperative Extension; National Radon Program Services; Kansas Radon Program; Michigan Department of Environment, Great Lakes, and Energy; EPA; EIA. Read 2026-09-30.
Cost calculator
Describe the house, get the published range that fits it
Pick your state to use its own health department’s figure where one exists. The foundation, suction points and pipe route decide where in that range your quote is likely to land.
Sets the published range and the licensing rule shown in the result.
Basements and slabs get sub-slab suction: a pipe through the floor into the gravel or soil beneath.
EPA: often only one is needed. A contractor sets this after a diagnostic test of how air moves under the slab.
EPA requires the fan outside or in unconditioned space such as an attic or garage, never in or below living space.
e.g. RadonAway RP145, Festa Hawk or Maverick (66 W)
Rated maximum watts from the Minnesota Department of Health’s 2023 fan table. Actual draw is often lower.
Default: 18.31¢/kWh, the US residential average for July 2026 (EIA). Your bill shows your own rate.
Published costs
What health departments and extension services say a system costs
Every dollar figure on this page comes from one of these public sources. None of them prices a crawl space, a second suction point or attic routing separately, so neither do we.
| Source | Range | Average | Date | Notes |
|---|---|---|---|---|
| Minnesota Department of Health | $1,500–$3,000 | — | page last updated Oct 3, 2024 | State figure; the calculator uses it for this state. |
| Colorado Department of Public Health and Environment (Radon FAQ) | $1,300–$3,000 | — | undated page, read 2026-09-30 | The same agency's testing page gives an older-looking "$1,000 - $2,000 unless difficult design problems are encountered", and the FAQ puts adding a fan to an existing passive system at about $500. |
| Wisconsin Department of Health Services | $1,000–$2,000 | — | page last revised June 25, 2026 | State figure; the calculator uses it for this state. |
| University of Georgia Cooperative Extension (Circular 1065) | $900–$3,000 | $1,500 | published 2015, revised Nov 25, 2025 | Attributed to EPA; we could not find these dollar figures in EPA's current consumer guides, which say only that most homes cost about the same to fix as other common home repairs. |
| National Radon Program Services (Kansas State University, EPA cooperative agreement) | $800–$2,500 | $1,200 | undated page, read 2026-09-30 | National figure. |
| Kansas Radon Program (Kansas State University Engineering Extension) | $800–$2,000 | $1,200 | undated page, read 2026-09-30 | State figure; the calculator uses it for this state. |
| Michigan Department of Environment, Great Lakes, and Energy (Radon FAQ) | $750–$1,500 | — | FAQ revised December 2020 | State figure; the calculator uses it for this state. |
| Illinois Emergency Management Agency (mitigation fact sheet) | $800–$1,200 | — | fact sheet coded 1-03 (January 2003) | Over 20 years old; listed for context and left out of the current range. |
Read 2026-09-30. The current sources span $750–$3,000; the median of their low ends is $900 and of their high ends $2,500. Stated averages: $1,500, $1,200, $1,200. Illinois’ figure is from 2003 and is not used in the ranges.
What sets the price
Your foundation decides the method, and the method decides the work
| Foundation | EPA’s usual method | What adds work |
|---|---|---|
| Basement | Sub-slab suction: a pipe through the floor into the gravel or soil, a fan, and a vent above the roof | Tight soil (more suction points), hollow block walls, a finished basement |
| Slab on grade | Sub-slab suction, sometimes from outside below the slab edge | No basement to run pipe in; the route often goes through a closet or garage |
| Crawl space, dirt floor | Sub-membrane suction: heavy plastic sealed over the ground with suction beneath it | Size, height and clutter of the crawl space; piers and pipes to seal around |
| A mix | A combination, often a sub-slab system and a membrane tied to one fan | Two systems’ worth of work |
- Suction points. EPA says one is often enough; how many depends on how easily air moves under the slab and how strong the radon source is. A contractor finds out with a diagnostic test.
- A sump pit can help. Capped with a sealed lid, it can drain water and act as the suction point (EPA calls this sump-hole suction). A gasketed sump lid is part of most basement jobs anyway.
- Pipe route. The fan must be outside or in unconditioned space such as an attic or garage, never in or below living space. The exhaust must vent above the roof, at least 10 ft above the ground, and at least 10 ft from windows and doors unless it ends 2 ft or more above them. Up the outside wall is usually the shortest job; up through closets is the longest.
- Sealing. Sealing floor cracks and openings is part of most systems, but EPA does not recommend sealing alone.
- Included items to check on a quote: a warning device (usually a U-tube gauge), electrical work to code, any permit, and a post-mitigation test.
After install
What a radon system costs to run
The fan runs around the clock, so its yearly cost is its watts × 8,760 hours × your electricity price. That is the method the Minnesota Department of Health gives, along with a shortcut: at about 10¢ per kWh, a fan’s watts roughly equal its dollars per year. At the July 2026 US average of 18.31¢, multiply the watts by about 1.6.
Rated watts are a maximum. MDH notes the actual draw depends on how much air the fan moves, and a fan pulling against tight soil moves less air and uses less power. A plug-in watt meter on the fan gives the real number.
| Fan | Rated watts | kWh a year | Per year |
|---|---|---|---|
| Low-power (Fantech RN1 (20 W), RadonAway RP140 (19 W)) | 20 W | 175 | $32 |
| Standard (RadonAway RP145, Festa Hawk or Maverick (66 W)) | 66 W | 578 | $106 |
| High-suction (RadonAway GP501 (146 W), Festa Legend or Fury (140 W)) | 146 W | 1,279 | $234 |
Rated watts from MDH’s 2023 fan table. Cost at 18.31¢/kWh (EIA, July 2026).
- Fan replacement: $200–$350 including parts and labor, according to EPA. Fans “may last for five years or more,” and warranties rarely run past five years. EPA’s 2025 analysis assumes a replacement every 10 years at $476 (2023 dollars).
- Retesting: EPA advises a retest at least every two years. Do-it-yourself kits run $10–$50 (Colorado health department); a professional test about $150.
- Heating and cooling: EPA says most systems pull out some conditioned air, which can raise utility bills, but no public source puts a number on it. EPA’s 2025 model uses $206 a year for all operating costs.
Home sales and value
Who pays, and is it worth it?
Who pays for radon mitigation in a home sale
No federal rule decides it; it is negotiated. EPA’s Home Buyer’s and Seller’s Guide says the contract should spell out who does the test, how the buyer and seller share results and costs, and when mitigation will happen and who will pay for it. If a high result turns up mid-sale, EPA says the two sides should discuss the timing and cost of the fix.
What states require is disclosure, not payment. In our state table, 38 states have a radon disclosure duty for sellers, 13 of them in a radon-specific statute. Look up yours in the radon laws by state table. In practice a seller can install the system, credit the buyer the quoted cost, or lower the price. A system installed before closing should come with the post-mitigation test result and any transferable warranty.
Is radon mitigation worth it?
EPA’s answer is to fix a home at 4 pCi/L or more and consider it between 2 and 4. Its techniques table rates sub-slab and sub-membrane suction at 50 to 99 percent reductions. In October 2025 EPA estimated that testing homes and mitigating those above 4 pCi/L returns $7.38–$15.27 in health benefits for every dollar spent, and the result stayed positive even at two or three times its cost assumptions.
For a single household the math is simpler: a few thousand dollars once, then roughly the cost of a light bulb left on, against the second leading cause of lung cancer. Check your area’s odds on the radon levels by zip code map, but decide on your own test result.
FAQs
Radon mitigation cost: common questions
How much does a radon mitigation system cost?
Usually $900–$2,500 installed, the typical range across 7 public health and extension sources; the spread runs $750–$3,000. Minnesota's health department says $1,500 to $3,000 and Colorado's $1,300 to $3,000. One suction point through a basement floor with the pipe up the outside wall is the low end; crawl-space membranes, extra suction points and interior routing push it up.
How much does it cost to replace a radon fan?
EPA puts a fan replacement at about $200–$350 including parts and labor. Fans may last five years or more; EPA's 2025 cost model assumes one every 10 years. Check the gauge on the pipe regularly, since a stopped fan means the system is not working.
How much electricity does a radon fan use?
Its rated watts × 8,760 hours. A standard 66 W fan uses about 578 kWh a year, about $106 at the July 2026 US average of 18.31¢ per kWh. Low-power fans of about 20 W cost a third of that; high-suction fans of about 140 W cost twice as much. Actual draw is often below the rating.
How much does radon mitigation cost in a crawl space?
No public source prices crawl spaces separately. EPA's method for a dirt-floor crawl space is sub-membrane suction, which adds sealing a heavy plastic sheet over the ground to the pipe-and-fan work, so expect the middle or upper part of your state's range, more for a large, low or cluttered crawl space. If you are also encapsulating the crawl space for moisture, ask whether the liner can serve as the radon membrane.
Is radon mitigation worth it?
EPA recommends it at 4 pCi/L or more and suggests considering it from 2 to 4. Sub-slab systems typically cut radon 50 to 99 percent, and EPA's 2025 analysis estimated $7.38–$15.27 in benefits per dollar for testing and mitigating homes above the action level.
Who pays for radon mitigation, the buyer or the seller?
It is negotiated. EPA advises writing into the contract who tests, how results and costs are shared, and when mitigation happens and who pays. Sellers often install the system or give a credit. Many states require radon disclosure, but none we found sets who pays.
Can I install a radon mitigation system myself?
Some homeowners do, and Colorado's health department says you might be able to do sub-slab depressurization yourself with good handyman skills. But 17 states and DC license, certify or register radon mitigators, some require licensed work in a home sale, and EPA's rules on fan placement, exhaust height, electrical work and the warning device still apply. Either way, test afterward: 24 hours to 30 days after start-up, with a 2–7 day test.
Does sealing cracks reduce radon?
It helps the system work but is not a fix by itself. EPA does not recommend sealing alone because it has not been shown to lower radon significantly or consistently: it is hard to find and permanently seal every entry point.
Related pages
Where to go next
Radon levels by zip code
Your county’s EPA zone, local test results and every state’s radon law.
Read nextBasement floor cracks
Which cracks matter for water and soil gas, and how to seal them.
Read nextSump pump smell and sealed lids
An open sump pit lets soil gas into the basement.
Read nextBasement ventilation
Why an exhaust fan can pull more radon into a basement.
Read nextDoes crawl space encapsulation reduce radon?
Our sister site on crawl spaces and sub-membrane systems.
Read nextBasement waterproofing
Waterproofing and radon share entry points; plan them together.
Read nextMethodology
How this calculator works
Installed cost. We collected every dollar figure we could find from state radon programs, state health and environment agencies and university extension services, and quote each one in the table above with its date. If your state publishes its own figure (Minnesota, Colorado, Wisconsin, Georgia, Kansas, Michigan), the calculator uses it; otherwise it uses the typical range, the median of the sources’ low ends to the median of their high ends.
Placing your home. None of the sources prices individual features, so the calculator does not add dollars per feature. It scores the cost drivers EPA describes in its Consumer’s Guide to Radon Reduction (foundation type, suction points, block walls, pipe route, a finished basement) and places the home in the lower, middle or upper third of the range. A mixed foundation or three or more suction points is flagged as possibly above the published range.
Running cost. Rated fan watts from the Minnesota Department of Health’s 2023 fan table × 8,760 hours × the electricity price (default: EIA’s US residential average). Fan replacement and fan life are EPA’s figures; retest kit prices are Colorado’s. Heating and cooling losses are left out because no public source quantifies them.
State rules. Licensing and radon offices come from the same state-by-state table that powers our radon levels page, checked against statute text or the state agency.
Not a quote. Several published figures are undated or several years old, and local labor rates vary. Get two or three written estimates from licensed or certified mitigators.
Sources checked: 2026-09-30.
Sources
Sources
- Minnesota Department of Health — In general, costs can range from $1,500 to $3000. (page last updated Oct 3, 2024)
- Colorado Department of Public Health and Environment (Radon FAQ) — Traditional radon mitigation systems installed on existing single-family homes are approximately $1,300-$3,000. (undated page, read 2026-09-30)
- Wisconsin Department of Health Services — The average cost for a contractor to install a radon mitigation system is $1,000-$2,000. (page last revised June 25, 2026)
- University of Georgia Cooperative Extension (Circular 1065) — The U.S. Environmental Protection Agency (EPA) reports that the average radon mitigation costs about $1,500, but can range from $900 to $3,000. (published 2015, revised Nov 25, 2025)
- National Radon Program Services (Kansas State University, EPA cooperative agreement) — The average cost for a contractor to lower radon levels in a home is about $1,200, although this can range from $800 to about $2,500. (undated page, read 2026-09-30)
- Kansas Radon Program (Kansas State University Engineering Extension) — The average cost for a contractor to lower radon levels in a home is about $1,200, although this can range from $800 to about $2,000. (undated page, read 2026-09-30)
- Michigan Department of Environment, Great Lakes, and Energy (Radon FAQ) — A typical range in price would be $750-$1,500. (FAQ revised December 2020)
- Illinois Emergency Management Agency (mitigation fact sheet) — The cost of a radon reduction system generally ranges from $800 to $1200. (fact sheet coded 1-03 (January 2003))
- EPA — Analysis of Benefits and Costs of Radon Reduction Strategies Recommended by the EPA (October 2025), Table 1, 2023 dollars
- EPA — How do I know if my radon mitigation system is working properly? (fan replacement $200–$350; fans last 5+ years)
- EPA — Consumer's Guide to Radon Reduction: How to Fix Your Home (revised December 2016)
- EPA — Home Buyer's and Seller's Guide to Radon (EPA 402/K-24/001, revised March 2024)
- Minnesota Department of Health — Calculating Energy Costs for Mitigation Systems (Sept 13, 2023), with rated watts of common radon fans
- Colorado CDPHE — Testing and mitigating your home for radon (DIY test kits $10–$50)
- U.S. Energy Information Administration — Electric Power Monthly, Table 5.6.A (residential average price, July 2026)