Cost guides

Radon mitigation costs $800–$2,500 installed for a fan-based sub-slab system in an existing home, with a national average near $1,200. That is EPA's published band, and it is still the number to plan against. What changes from house to house is how much foundation work the system needs, not the fan.

What the EPA figure covers

The Consumer's Guide to Radon Reduction (EPA 402/K-10/002, January 2010) describes a complete active soil depressurization system: a suction point through the slab, PVC pipe, an inline fan, a system indicator, and a vent above the roofline. It does not cover testing, electrical work, or cosmetic repair. Our full cost guide breaks the quote into line items.

Cost by system type

System	Foundation	Installed band
Sub-slab depressurization	Basement, slab-on-grade	$800–$2,500
Sub-membrane depressurization	Crawl space	$1,100–$3,000
Drain-tile or sump tie-in	Slab with perimeter drainage	$800–$2,500
Block-wall depressurization	Hollow-block foundation	$1,000–$3,000
Passive system, new construction	Any, built in	$500–$1,500

System by foundation type →

What moves the price

Five things: the foundation type, the number of suction points, interior versus exterior pipe routing, local labor rates, and whether the electrical panel can take the fan without a new circuit. A crawl space plus a finished basement is the expensive combination; a single suction point through an unbroken slab is the cheap one.

Running cost

A mitigation fan draws under 90 watts. At the August 2026 US average of 18.16 cents per kWh, an 80 W fan running continuously costs about $127 a year; EPA budgets $50–$200. The fan is the only part of the system that uses electricity.

Testing comes first

A short-term kit with lab analysis costs $15–$45 and tells you whether a system is needed at all. A certified measurement costs $150–$250 and is the version used for a real-estate transaction. Do not price a system before you have a number — testing guides →

Frequently asked questions

How much does a radon mitigation system cost installed?

EPA publishes $800–$2,500 for a fan-based sub-slab system in an existing home, with a national average near $1,200. Crawl-space and multi-foundation homes run higher.