Radon mitigation cost calculator

Pick the system, add a test and permit, and enter your ZIP. Prices come from HomeAdvisor and Bob Vila, with every step shown.

$1,003Typical active sub-slab system

$150 to $800Professional test (HomeAdvisor)

$30 to $300A year to run the fan (Bob Vila)

Radon mitigation cost

$779 to $1,230

Typical $1,003 (US average)

$779Low

$1,230High

Test before and after. A follow-up test confirms the system brought the level down.

Free. Your numbers become an estimate you can send from your phone.

How we got this

Active sub-slab system (slab or basement)$779 to $1,230 (typical $1,003)HomeAdvisor $786 to $1,274 (average $1,028), Bob Vila $771 to $1,185 (average $978); middle of the two.
RegionUS average prices (no ZIP entered)Enter a ZIP to scale the labor part of the price to your state's wages.
Total$779 to $1,230, typical $1,003

Item	Qty	Low	Typical	High
Radon mitigation, active sub-slab system	1	$779	$1,003	$1,230
Total		$779	$1,003	$1,230

Sources: HomeAdvisor, radon mitigation system cost; Bob Vila, radon mitigation system cost; BLS Occupational Employment and Wage Statistics, May 2025 (state and national files); US Census Bureau, 2020 ZIP Code Tabulation Area to county relationship file. Checked 2026-10-09.

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Key takeaways

An active radon mitigation system usually costs $786 to $1,274, HomeAdvisor says, $1,028 on average.
Bob Vila puts crawl space systems at $800 to $3,000; larger or complex homes can reach $3,000.
Test before and after. HomeAdvisor puts a professional test at $150 to $800.
The fan runs all the time and adds $30 to $300 a year to the power bill, Bob Vila says.

What a radon system costs

HomeAdvisor puts active systems at $786 to $1,274 with $1,028 average; Bob Vila says $771 to $1,185 with $978 average. The calculator takes the middle of the two. HomeAdvisor says passive systems cost $500 to $2,500.

How mitigation works

Sub-slab depressurization is the common method: a pipe through the slab and a fan pull soil gas from under the house and vent it above the roof. Bob Vila puts sub-slab systems at $800 to $2,500. Crawl spaces get a sealed plastic membrane with the pipe under it. Bob Vila says radon fans cost $100 to $300.

Testing

Bob Vila says radon test kits run $12 to $250 and a professional test $150 to $800. A long-term test gives a better average. The EPA sets the level at which it recommends fixing; test again after the system goes in.

A worked example

An active sub-slab system at the US average comes to $779 to $1,230, about $1,003 typical, or about $1,566 with a test and permit. Enter a ZIP to scale the 55% labor share.

Quoting radon jobs

Attach the test result.
Pipe route. Inside through a closet or outside.
Post-install test. Schedule it on the invoice.

Send it from Koira.

Last checked October 9, 2026. More for your trade: how trades run on Koira.

FAQ

How much does radon mitigation cost?

HomeAdvisor says $786 to $1,274, $1,028 average. Bob Vila says $771 to $1,185.

How much is a radon test?

HomeAdvisor says $150 to $800 for a professional test.

Does a radon system cost much to run?

Bob Vila says the fan adds $30 to $300 a year to the power bill.

How much is crawl space radon mitigation?

Bob Vila says $800 to $3,000.

Do I need a permit for radon mitigation?

Sometimes. HomeAdvisor puts permits at $25 to $150.

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