What will the system cost?
This tool starts from the band EPA publishes for a fan-based system — $800–$2,500 installed — and moves you within it based on the work your foundation needs. It is a planning number, not a quote.
The model: each foundation type has its own published band and a starting position (basement near $1,200). Extra suction points and an exterior route move the estimate up inside the band; a sealed sump tie-in moves it down. Mixed foundations use a derived band for two foundation types and are labelled as derived. The ten-year figure adds ten years of fan energy and one fan replacement at the midpoint of the $150–$450 replacement range.
How to use the number
A planning number is for budgeting, not for negotiating. The bid you accept should still name the suction-point count, the fan model, the pipe route, whether the permit and the post-install test are included, and the radon level the contractor expects to reach. If a quote is far from this estimate, ask which of those items explains the difference.
The annual figure is arithmetic, not a guess: watts × 8.76 = kWh a year, then kWh × your electricity rate. At the August 2026 US average of 18.16 cents per kWh, an 80 W fan costs about $127 a year. Change the rate field to your own utility's number and the output changes with it.
What the calculator cannot see
Soil permeability, the number of footings under the slab, whether the roof penetration is straightforward, local permit rules and the electrician's bill. Those are site-visit facts. The calculator also assumes the house already tests at or above the 4 pCi/L action level — if it does not, the right next purchase is a test, not a system.
Sources behind the bands
The base bands come from EPA's Consumer's Guide to Radon Reduction (402/K-10/002) and from state radon program and EPA-partner material where EPA publishes no separate figure. The methodology page explains which band comes from which source and how the running-cost maths is checked. Read the methodology →