Radon Mitigation Cost in Idaho (2026)

Radon in Idaho

Idaho's geology creates high radon risk across much of the state. The Rocky Mountain batholith — the same granite mass underlying Montana, Wyoming, and Colorado — runs through central and northern Idaho, producing significant uranium and radon.

High-risk areas:

• Northern Idaho (Coeur d'Alene, Sandpoint, Moscow, Lewiston): Zone 1, frequent readings above 10 pCi/L
• Central mountains (Salmon, Challis, Stanley area): Zone 1 granite terrain
• Boise foothills: Zone 1–2, elevated in areas near granite outcrops
• Snake River Plain (Twin Falls, Pocatello, Idaho Falls): Zone 2, volcanic basalt but still elevated in pockets

Cost by Foundation Type

Basement: $950–$2,000

Idaho's cold winters make basements common, particularly in northern Idaho and the mountain communities.

• Unfinished basement: $950–$1,500
• Finished basement: $1,400–$2,000

Slab-on-Grade: $900–$1,800

Most common in the Boise metro and newer Snake River Plain construction.

Crawl Space: $2,500–$5,500

Older Idaho homes, particularly in Coeur d'Alene, Moscow, and the mountain towns, often have crawl spaces over rocky soil.

Idaho-Specific Factors

Boise growth: The Boise metro has exploded in growth, bringing more contractor options and competitive pricing. Northern Idaho remains underserved — expect longer waits.

Mining legacy: Some north Idaho communities have historic silver and lead mining — if your home is near a historic mine site, ask your contractor about potential additional radon sources.

Rural contractor shortage: Outside Boise and Coeur d'Alene, certified contractors are scarce. Plan ahead and expect travel fees.

Idaho Resources

• ID Dept of Health & Welfare: healthandwelfare.idaho.gov (search "radon")
• Verify NRPP: radonproficiency.org
• Verify NRSB: nrsb.org

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