Radon Mitigation Cost in Grand Isle, VT
Quick Answer: The average cost for radon mitigation in Grand Isle County is $1317 (typically ranging from $950 to $1685). This cost primarily depends on your home's foundation type and the complexity of pipe routing.
Grand Isle is classified as EPA Zone 3 (Low Risk). Average indoor radon levels in this area are generally below 2 pCi/L. However, the EPA recommends testing all homes regardless of zone classification, as elevated levels can occur anywhere.
Homes in Grand Isle have a predicted average indoor radon screening level below 2 pCi/L. This is the lowest-risk zone defined by the EPA. However, it is critical to understand that zone classifications represent county-wide averages — individual homes can and do test above the action level even in Zone 3 areas.
Your Radon Reading
Enter your home's measured level or use the Grand Isle County average
Safe Range
Your reading is within the safe range. Both the EPA (4.0) and WHO (2.7) thresholds are not exceeded. Mitigation is not needed right now. We recommend periodic monitoring with a digital radon detector.
Get a Home Radon Monitor (~$30)Elevated — Consider Action
Your reading passes the US EPA threshold (4.0 pCi/L) but exceeds the World Health Organization's recommended limit of 2.7 pCi/L. This is equivalent to smoking approximately cigarettes per day.
If you have children, spend significant time in your basement, or are buying/selling the home, mitigation is strongly recommended. Scroll down to see your estimated cost.
Verify with Long-term Monitor (~$150)⚠ Action Required — EPA Threshold Exceeded
At pCi/L, your exposure is equivalent to smoking cigarettes every day. The US EPA strongly recommends immediate mitigation for any home above 4.0 pCi/L.
Typical mitigation systems reduce radon by 80–99%. See your itemized cost estimate below ↓
Refine Your Estimate
Adjust parameters to simulate local costs
Basement Factors
Basement foundations are the most common installation type. The mitigation system typically runs a PVC pipe from below the basement slab, through the house, and out the roof. This is the standard installation and carries the lowest labor complexity.
Negotiation Note
Basement installations are well-understood by contractors, so quotes should be competitive. If you receive a quote significantly above our estimate, get a second opinion.
State Regulation Notice
Vermont requires sellers to disclose known lead and environmental hazards. Radon falls under general disclosure obligations.
View official state siteOfficial Estimate
Grand Isle County, VT
Estimated Total
Range: $950 – $1685
| Component | Average Cost |
|---|---|
| System Materials | $400 |
| Specialized Labor | $742 |
| Permits & Setup | $175 |
| Estimated Total Range | $950 - $1685 |
| Average Total | $1317 |
Prices are dynamically adjusted for local market multipliers and represent standard sub-slab or basement installations. Real contractor pricing may vary based on structural complexity.
Buying a Home in Grand Isle? Here's Your Radon Action Plan
You're in the middle of one of the biggest financial decisions of your life. A high radon test result during inspection can feel like a deal-breaker — but it doesn't have to be. Here's exactly what to do.
- Do NOT panic. Radon mitigation is routine and well-understood. It does not mean the house is defective.
- Do NOT ask the seller to hire the contractor. You want to choose your own certified professional.
- DO request a Seller Credit (also called a Closing Credit) equal to the estimated mitigation cost.
- Use the itemized estimate above as documentation to justify the credit amount to the seller's agent.
- After closing, hire a state-certified radon mitigator and pay using the credit you received.
Frame the request as 'I'd like a $1317 closing credit for radon mitigation' rather than 'Fix the radon.' Sellers are far more likely to agree to a credit than to manage a repair themselves.
Est. Total
$1317
Get an Exact Price for Your Home in Grand Isle
Our estimate above is a regional average. To get an exact, binding quote, we can connect you with state-certified radon mitigation professionals serving Grand Isle County.
- Zero obligation to hire
- Only certified local contractors
- Compare quotes to guarantee the best price
Frequently Asked Questions
Yes. The EPA's official recommendation is to test every home, regardless of zone. Zone 3 represents a county-wide average below 2 pCi/L, but localized geological features can produce elevated levels in individual homes. The test costs $15-$30 and takes 2-7 days.
Yes. The EPA has documented homes in Zone 3 areas testing above 20 pCi/L (5x the action level). Radon entry depends on highly localized factors: cracks in the foundation, soil permeability directly beneath your home, and ventilation patterns.
Yes. In VT, Vermont requires sellers to disclose known lead and environmental hazards. Radon falls under general disclosure obligations.. Sellers who fail to disclose known radon test results may face legal liability after the sale closes.
In VT, concealing known radon levels violates state disclosure requirements. Buyers can pursue legal remedies including rescission of the sale or damages for the cost of mitigation (approximately $1317 in Grand Isle).
Based on local labor rates and material costs, radon mitigation in Grand Isle typically costs between $950 and $1685, with an average of $1317. The final cost depends on your foundation type (basement, crawl space, or slab) and the complexity of the installation.
This is negotiable. In most real estate transactions, the buyer requests a Seller Credit (closing credit) to cover the cost of mitigation. The buyer then hires their own contractor after closing. In VT, radon disclosure is required during property sales.
A standard sub-slab depressurization system is typically installed in 4-8 hours by a certified professional. The system begins reducing radon levels immediately, and a post-mitigation test is usually conducted 24-48 hours after installation.
The most common and effective system is Active Sub-slab Depressurization (ASD). A pipe is inserted through or below the foundation slab, and a small fan continuously draws radon gas from beneath the home and exhausts it above the roofline, where it safely disperses.
Yes. A properly mitigated home with documentation removes a major buyer objection. In Grand Isle, where the average mitigation costs $1317, the return on investment is highly favorable — especially in Zone 3 areas where buyers actively screen for radon.
While DIY radon mitigation is technically possible, it is strongly discouraged. Improper installation can fail to reduce radon levels or even increase them. In VT, Vermont does not require specific radon licensing.. The EPA recommends hiring a certified professional.
More About Radon in Grand Isle County
Explore Radon Mitigation Costs in Nearby VT Counties
Sources & Methodology
The radon mitigation cost estimates presented on this page are dynamically calculated using baseline national material averages combined with localized labor multipliers for Grand Isle County.
Important Disclaimers
- Health & Safety: Information on this site is for educational purposes and is not medical advice. For health concerns, consult qualified professionals.
- Estimates: Estimates are general ranges based on typical projects. Actual quotes vary by home conditions and local labor.
- Zone Data: Radon zone classifications describe regional potential for elevated indoor radon. They do not predict the radon level in a specific home. Testing is recommended for all homes.
Data Sources
- US Environmental Protection Agency (EPA) - Action Level
- EPA Map of Radon Zones
- National contractor cost guides and local labor indices.
Page Content Last Updated: February 2026