How Much Does Radon Mitigation Cost in 2026?

Radon mitigation costs $1,200–$2,000 for a typical sub-slab system (2026 survey); EPA's older guide put the average at $1,200. Costs by system and add-ons.

Short answer

Radon mitigation costs $1,200 to $2,000 for a typical active soil depressurization system in 2026, with a national average of $1,600, according to HomeGuide's February 5, 2026 cost guide. EPA's 2010 Consumer's Guide to Radon Reduction put the average at about $1,200 and the usual range at $800 to $2,500, in 2010 dollars. Estimate your system with your foundation and options.

Is radon mitigation worth it?

EPA recommends fixing a home at 4 pCi/L or above and considering a fix between 2 and 4 pCi/L, and estimates about 1 in 15 U.S. homes have elevated radon (EPA Citizen's Guide, 2016). EPA's Consumer's Guide says mitigation systems can reduce radon levels in a home by up to 99 percent. For health questions, see EPA and your state radon office.

Why two homes on the same street pay different prices

Foundation type (basement, slab, crawlspace, hollow block wall, or a mix), how easily air moves through the fill under the slab (EPA notes sub-slab suction works best if air can move easily in the material under the slab), the number of suction points, the pipe route (an outside wall versus through the attic) and how high the starting level is. Each of those changes labor and materials.

Radon fan replacement cost

Radon fans run around the clock and eventually wear out. We have not found a primary source that publishes a current replacement price, so we do not print one. Ask for a written quote for the fan plus labor, and check whether the original installer's warranty still covers it. The quote form can connect you with a certified mitigator.

Radon mitigation cost by system type

System	Typical installed cost	Source
Active soil (sub-slab) depressurization	$1,200–$2,000 ($2,500+ for large homes)	HomeGuide, Feb 2026
Drain-tile suction	$900–$1,800	HomeGuide
Sump pit sealing and cover, as part of a system	$900–$2,500	HomeGuide
Block-wall depressurization	$1,800–$3,000	HomeGuide
Crawlspace submembrane depressurization	$1,000–$2,500 (2010 dollars)	EPA Consumer's Guide, 2010
Heat recovery ventilator	$1,300–$2,200	HomeGuide
Radon in well water: carbon filter / aeration	$1,200–$1,800 / $4,000–$5,000	HomeGuide

What else goes on the bill

Professional radon test $125–$400; DIY kit $10–$30; some states hand out free kits (HomeGuide).
Permit $25–$150 where required, usually included in the bid (HomeGuide).
Fan electricity and heated or cooled air loss: $50–$200 a year for sub-slab systems (EPA, 2010 dollars).
Adding a fan to a passive system in a newer home: about $300 (EPA 2010 guide).
Continuous digital radon monitor: $150–$300 (HomeGuide).

Radon testing cost before and after

Test first, and test again after the system is in: EPA recommends a follow-up test after mitigation. Professional tests run $125 to $400 and kits $10 to $30 (HomeGuide). Check any ZIP's EPA zone and state test data with the radon levels by ZIP tool.

The numbers behind this guide

National survey ranges come from HomeGuide's February 5, 2026 guide, shown beside EPA's 2010 table (in 2010 dollars). State test results show how common high readings are: in Pennsylvania DEP's public data, 37.3% of 2,644,039 basement tests read 4 pCi/L or higher, and in the Ohio Department of Health dashboard 34.4% of 525,229 tests did (our counts of each agency's data). Last reviewed October 16, 2026.

Radon mitigation cost by state

No state agency publishes installed prices, so this guide does not invent state price tables. What states do publish is how common high radon is and who may install a system. Pennsylvania requires DEP-certified installers (25 Pa. Code Chapter 240), and Ohio requires an ODH license (OAC 3701-69). Licensing adds training and reporting costs that unregulated states do not carry (Cornelia Cove estimate). See the Pennsylvania radon guide, the Ohio radon guide and all state and county guides.

Who pays for radon mitigation in a home sale?

There is no federal rule. Buyer and seller negotiate it, usually after a test during the inspection period. A seller credit sized to a written bid is common. Use the calculator range to judge whether the credit covers a complete system with a post-mitigation test, which EPA recommends after installation.

How to compare quotes

Step 1: confirm a test at or above 4 pCi/L (or 2 to 4 if you choose), ideally a long-term test or two short-term tests (EPA).
Step 2: check the installer's state credential (PA DEP certification, an ODH license, an MDH license in Minnesota, a DORA license in Colorado) or national certification.
Step 3: ask each bidder for the system type, suction points, fan model and warranty, pipe route, sealing scope, permit and a post-mitigation test.
Step 4: compare each bid with your calculator range.
Step 5: retest after installation and every two years (EPA Consumer's Guide).

Questions

How much does a radon system cost?

$1,200 to $2,000 for a typical sub-slab system, national average $1,600 (HomeGuide, Feb 2026).

Does the seller pay for radon mitigation?

It is negotiated; no federal rule assigns it.

Is a radon fan expensive to run?

EPA's 2010 guide put fan electricity plus heated or cooled air loss at $50 to $200 a year for sub-slab systems.

Can I install it myself?

EPA advises hiring a qualified contractor, and some states, including Pennsylvania and Ohio, require a state credential for paid work.

Do I need a permit?

Sometimes. HomeGuide puts radon permits at $25 to $150 where required.

Sources

Prices are published ranges from the sources listed on this page; anything we calculated is labeled as an estimate. Get at least two itemized bids from certified or licensed mitigators. Run the calculator to build your own range.