Radon Mitigation Cost Calculator (2026)
By Dan Whitlock, Home Projects Editor · Updated July 2026
If a radon test comes back at or above the EPA’s 4 pCi/L action level, a mitigation system is the fix — and it’s usually a one-day install. In 2026, most homeowners pay $800 to $2,500 to have an active sub-slab depressurization system installed, with the national average landing near $1,000 to $1,500. Your price depends on the foundation type, the home’s size and layout, how many suction points the crew needs, and whether extras like a new fan or a sealed sump are involved. Build your estimate below, then see the cost drivers.
Estimate your cost
Includes the pipe run, fan, and basic sealing for a standard install.
Labor and materials swing with local cost of living.
Estimated radon mitigation cost
$1,000 – $2,200
Most homeowners pay around $1,450
Cost breakdown
- Sub-slab suction — slab or basement (most common)$1,450
Planning estimate based on 2026 national price data — not a quote. Get local quotes to confirm.
Free, no obligation. We may earn a commission if you request quotes — it never changes your price.
What drives your radon mitigation cost
- Foundation type: a poured slab or basement is the cheapest to treat; crawlspaces need a sealed membrane and cost more.
- Suction points: large, split-level, or additions-heavy homes may need 2–4 suction points, each adding a few hundred dollars.
- System routing: an interior pipe through the garage is cheaper than an exterior run designed to hide the pipe for curb appeal.
- Fan size: higher radon levels or tight soil call for a stronger fan, which costs more and uses slightly more electricity.
- Sealing extras: covering a sump pit, sealing slab cracks, or encapsulating a crawlspace adds to the base price.
Ready for real numbers?
A calculator gets you the fair range. Local quotes confirm it for your exact home. Comparing 2–3 pros is the single best way to avoid overpaying on a radon mitigation.
Free, no obligation. We may earn a commission if you request quotes — it never changes your price.
Ways to save
- Get a post-mitigation retest quoted into the job so you confirm the system works without a separate visit.
- Choose an interior pipe route through the garage or a closet if you don’t mind the visible pipe.
- Ask contractors to size one well-placed suction point before assuming you need several.
- Bundle sump sealing and crack repair into the mitigation quote instead of hiring separately.
- Compare two or three certified radon contractors — installed prices vary widely for the same scope.
Helpful products
Doing part of this yourself? These are the product categories most people buy for this job. As an Amazon Associate we may earn from qualifying purchases — it never changes your price.
Frequently asked questions
How much does radon mitigation cost in 2026?
Most homeowners pay $800 to $2,500 for a professionally installed system, with the national average around $1,000–$1,500. Small, simple homes can come in near $400; large or complex ones can reach $2,500 or more.
What affects radon mitigation cost the most?
Foundation type and the number of suction points. A single-point sub-slab system on an accessible basement is the low end; crawlspaces, big footprints, and hidden exterior routing push the price up.
How much does it cost to run a radon fan?
The fan runs continuously and typically adds about $30 to $300 per year in electricity depending on the fan size and local power rates — most homes land near the lower end of that range.
Do I need radon mitigation if my level is below 4 pCi/L?
The EPA recommends action at 4 pCi/L and says to consider mitigation between 2 and 4. Below 2 pCi/L a system usually isn’t warranted, though these are planning guidelines, not a substitute for a certified test.
Sources
Price ranges cross-referenced against these 2026 cost guides and contractor databases:
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