Montana Radon Mitigation Cost by County, Foundation, and Rules
Compare typical local price ranges for basement, slab, and crawl space systems. Use the state-level ranges first, then open your county when you need a local estimate after a confirmed radon result.
Fastest Start
Use ZIP Instead of Scrolling
If you know the property ZIP, jump straight to the right county estimate instead of browsing the full state list.
Cost Basics
Foundation & Result Ranges
Use the national cost guide if you need basement, slab, crawl-space, or 4.0+ result context first.
Validate the Risk
Check MT Radon Levels
If you do not have a confirmed radon result yet, review EPA zone context before you compare mitigation pricing.
Browse Counties
Jump to County Pricing
Open your county if you already know the area and just need a local basement, slab, or crawl-space price range.
Official State Resource
Montana radon program and rules
Use the state program link to verify local radon guidance, disclosure language, and contractor credential expectations before you act on an estimate.
Disclosure note
Montana does not have specific radon disclosure requirements. General property disclosure laws apply.
Credential note
Montana does not require state licensing for radon professionals.
MT Cost Starting Point
Montana cost range by foundation
Basement
$890-$1583
Use this when the home has a basement or lowest-level slab that supports a standard sub-slab suction system.
Slab-on-Grade
$841-$1485
Slab homes can price differently when finished space, routing, or core drilling complicates the system path.
Crawl Space
$1388-$2530
Crawl-space jobs can move higher when vapor-barrier sealing, access, and sub-membrane suction add labor.
State rules that can change the quote
Disclosure: No broad state disclosure requirement is modeled here. Montana does not have specific radon disclosure requirements. General property disclosure laws apply.
Mitigation licensing: No state-specific mitigation license premium is modeled. Montana does not require state licensing for radon professionals.
EPA zone mix in Montana
49
Zone 1
7
Zone 2
0
Zone 3
56 classified counties are used for state-level risk context. EPA zones do not replace a home test, but they help explain why county pages and confirmed 4.0+ results matter before comparing quotes.
County estimates
Open a Montana county page for local pricing
County pages narrow the state range with local EPA zone context, housing data, state rules, and the foundation scenario you choose.
Why Does Cost Vary in Montana?
Price ranges across Montana move with local labor rates, permit friction, roofline routing, and foundation type. County pages narrow this down for homeowners comparing basement, slab, or crawl space mitigation after a confirmed radon reading.