Hawaii 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 HI 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
Hawaii 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 rule tracked
Hawaii requires sellers to complete a Seller's Real Property Disclosure Statement covering known defects and environmental hazards.
Credential note
Hawaii does not require specific radon licensing.
HI Cost Starting Point
Hawaii cost range by foundation
Basement
$1100-$1940
Use this when the home has a basement or lowest-level slab that supports a standard sub-slab suction system.
Slab-on-Grade
$1030-$1800
Slab homes can price differently when finished space, routing, or core drilling complicates the system path.
Crawl Space
$1640-$2950
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: Required or commonly expected in this state context. Hawaii requires sellers to complete a Seller's Real Property Disclosure Statement covering known defects and environmental hazards.
Mitigation licensing: No state-specific mitigation license premium is modeled. Hawaii does not require specific radon licensing.
EPA zone mix in Hawaii
0
Zone 1
0
Zone 2
5
Zone 3
5 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.
Local cost guides
Hawaii evidence-backed cost route
The cost directory follows the same eligibility rule as the county cost pages themselves. State hubs, sitemap candidates, and internal links point at pages Google can actually index.
5
Listed
0
Evidence
0
Measured
Best county pages to open first
Honolulu County
Cost eligible local evidence
$1100-$1940
EPA zone and local housing support
Honolulu County is a strong cost page because it pairs EPA zone and local housing support with a local housing base of 369,775 units and a modeled planning range of $1100-$1940.
Hawaii County
Cost eligible local evidence
$1100-$1940
EPA zone and local housing support
Hawaii County is a strong cost page because it pairs EPA zone and local housing support with a local housing base of 88,965 units and a modeled planning range of $1100-$1940.
Maui County
Cost eligible local evidence
$1100-$1940
EPA zone and local housing support
Maui County is a strong cost page because it pairs EPA zone and local housing support with a local housing base of 71,801 units and a modeled planning range of $1100-$1940.
Kauai County
Cost eligible local evidence
$1100-$1940
EPA zone and local housing support
Kauai County is a strong cost page because it pairs EPA zone and local housing support with a local housing base of 30,236 units and a modeled planning range of $1100-$1940.
Kalawao County
Cost eligible local evidence
$1100-$1940
EPA zone and local housing support
Kalawao County is a strong cost page because it pairs EPA zone and local housing support with a local housing base of 96 units and a modeled planning range of $1100-$1940.
County estimates
Open a Hawaii 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 Hawaii?
Price ranges across Hawaii 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.