How Much Does Radon Testing Cost: DIY and Pro Pricing 2026
Radon testing cost in 2026 splits into three tiers depending on who does the work: DIY passive test kits ($15 to $50), DIY continuous radon monitors ($170 to $280 one-time purchase), and professional NRPP/NRSB-certified tests ($150 to $300). The right choice depends on the purpose of the test — pre-purchase due diligence, baseline awareness, long-term monitoring, or post-mitigation verification. This guide summarizes EPA and CDPHE radon guidance current as of 2026; for any elevated reading, engage an NRPP-certified mitigation professional. Below we break down each pricing tier, what’s included, and the typical follow-up costs.
How Much Does DIY Radon Testing Cost?
DIY radon testing is the cheapest path to a documented radon reading. Three DIY methodologies dominate:
Short-Term Passive Charcoal Kit
Cost: $15 to $30 for the kit, with $15 to $25 lab fee (often included in the kit price). Total: $15 to $35 for a single test.
How it works: Sits in the lowest occupied level for 2 to 7 days under closed-house conditions. Mailed to an NRPP/NRSB-listed lab. Lab returns a single integrated pCi/L average within 3 to 5 business days.
Best for: First-time screening, awareness, “is this a problem worth investigating further” decisions.
Top brands: AccuStar Charcoal Liquid Scintillation, Airchek, Pro-Lab, RadonAway First Alert. All are EPA-listed.
Long-Term Passive Alpha-Track Kit
Cost: $30 to $50 per device (lab fee usually included).
How it works: Sits in the home for 90 days to 12 months. Returns a longer-term integrated reading that better reflects annual exposure than short-term tests.
Best for: Annual-average data, post-mitigation long-term verification, ongoing awareness for owned homes (not real-estate transactions).
Top brands: AccuStar Alpha-Track Long-Term, Landauer Alpha-Track.
Continuous Radon Monitor (One-Time Purchase)
Cost: $170 to $280 one-time. No lab fees; no replacement needed for 5 to 8 years.
How it works: Electronic device with onboard sensor (alpha spectrometry) and display or smartphone app. Runs continuously, showing hourly, daily, weekly, monthly, and yearly trends.
Best for: Long-term home monitoring, post-mitigation verification, households who want year-round visibility.
Top brands: Airthings View Radon, Corentium Home, RadonEye RD200.
On a per-test basis, the continuous monitor is the most expensive entry. On a per-year basis over the device’s 5-to-8-year life, the continuous monitor is significantly cheaper than annual passive tests. A Corentium Home at $190 amortized over 6 years works out to about $32 per year of continuous data — less than the cost of one annual short-term passive test.
For broader context on Colorado’s high-radon environment, see our pillar on radon testing in Colorado.
How Much Does Professional Radon Testing Cost?
Professional radon testing in Front Range Colorado typically runs $150 to $300. Pricing tiers:
Home inspection radon add-on (charcoal kit): $150 to $200.
Home inspection radon add-on (CRM): $175 to $250.
Standalone NRPP/NRSB-certified test (CRM): $200 to $300.
Post-mitigation verification: $150 to $250 standalone.
Multi-location whole-home test: $300 to $600.
The professional service includes calibrated equipment, NRPP/NRSB certification, chain-of-custody documentation, and a formal written report. For real-estate transactional or legal use cases, this is the appropriate option.
For more detail on professional pricing in the context of a home inspection, see our companion article on radon inspection cost.
DIY vs. Professional: Which Is Right For You?
DIY is appropriate when:
You already own the home and want baseline awareness.
You’re testing a home you own to inform mitigation decisions.
You want ongoing year-round monitoring (continuous monitor).
You’re testing on a rental or short-term occupancy and don’t need transactional documentation.
You’re retesting after self-installed minor sealing improvements.
Professional is appropriate when:
The test is part of a real-estate transaction (buyer or seller wants a certified result).
The test will inform a mitigation contractor’s design or warranty claims.
Multi-family rental, commercial, school, or institutional setting requires regulatory compliance.
A prior DIY result is being disputed.
The household wants the additional defensibility of NRPP/NRSB certification and calibrated equipment.
Hidden Costs to Watch For
The headline price of a radon test doesn’t always include everything. Watch for:
Lab fees not included. Some cheap passive kits ($10) bill an additional $25 lab fee on retrieval. Total cost can be $35-$40.
Rush analysis surcharges. 24-hour lab turnaround typically adds $25 to $75 to the base lab fee.
Travel fees. Professionals serving rural counties may add $25 to $75 mileage fees.
Multi-location surcharges. Each additional sampling location in the same home commonly adds $50 to $150.
Recurring kit subscriptions. Some kit sellers offer auto-ship annual kits; the per-test cost is reasonable, but the annual commitment is worth comparing against a one-time continuous monitor purchase.
Cost Comparison Over Time
For a Front Range homeowner planning to live in a home for 6+ years, the cost comparison over time:
Annual short-term passive testing: $25 × 6 = $150 over 6 years.
Biennial professional CRM testing: $200 × 3 = $600 over 6 years.
One-time continuous monitor: $200 one-time, with replacement batteries ($15) every 18 months = ~$260 over 6 years.
The continuous monitor strikes a middle ground: cheaper than biennial professional testing, more informative than annual short-term passive testing, and ongoing visibility throughout the period.
Mitigation Costs After Testing
If the test reveals radon above the 4 pCi/L EPA action level, mitigation costs follow:
Standard sub-slab depressurization (most common): $1,200 to $3,500 for a typical Front Range single-family home. Includes one suction point, PVC routing, exterior fan, discharge above roof.
Multi-point or slab-on-grade systems: $2,500 to $5,500.
Crawl space sub-membrane depressurization: $1,500 to $4,500.
Post-installation verification: $0 to $250 (often included with installation).
Long-term system maintenance: Manometer monitoring (free, homeowner-performed monthly); fan replacement every 5 to 10 years at $300 to $500.
For most Front Range homes, the all-in cost of radon testing plus mitigation falls between $1,500 and $5,000.
Why Test in the First Place?
EPA attributes approximately 21,000 U.S. lung-cancer deaths annually to radon exposure — making it the second-leading cause of lung cancer after smoking. The exposure-response relationship is linear with no safe threshold, though the action level for residential mitigation is 4 pCi/L. WHO sets a more conservative 2.7 pCi/L action level.
Colorado is overwhelmingly in EPA Zone 1 (highest predicted radon potential). CDPHE data shows roughly half of Colorado homes test above 4 pCi/L. Front Range counties — Denver, Boulder, Douglas, Jefferson, Arapahoe, El Paso, Adams, Broomfield, Elbert — all fall in Zone 1.
For a $20 to $300 one-time testing cost, the household gains either documented assurance that radon is not a concern, or actionable information to install mitigation. Either outcome is worth the price.
Common Questions About Radon Testing Cost
“Is the cheap $10 kit accurate?” EPA-listed kits are accurate within ±20 percent above 1 pCi/L. The accuracy depends on whether the testing protocol was followed (closed-house conditions, proper placement, prompt mailing to lab). Cheap kits work if used correctly.
“Should I pay extra for a continuous monitor?” If you’ll live in the home 3+ years, the continuous monitor is cost-effective. If you’re testing a home you’ll only live in briefly, a passive kit is sufficient.
“Does the seller pay for radon testing?” In Colorado, the buyer typically pays during the inspection contingency window. Some sellers commission pre-listing tests, but those don’t replace the buyer’s test.
“How often should I retest?” EPA recommends every 2 to 5 years for any home, and after any mitigation system installation. Continuous monitors provide year-round visibility without separate retests.
For more on home detector options for ongoing monitoring, see our best radon detector for home guide.
What Happens After the Test
Action thresholds based on the test result:
Below 2 pCi/L: Low. Retest every 2 to 5 years.
2 to 4 pCi/L: Moderate. Consider mitigation; WHO recommends mitigation above 2.7 pCi/L. Confirm with longer-term data.
4 to 10 pCi/L: EPA mitigation threshold. Confirm with another test, then engage NRPP-certified mitigation contractor.
10 to 20 pCi/L: Mitigation strongly recommended.
Above 20 pCi/L: Urgent mitigation. Limit time in lowest levels until system is active.
DIY Test Kit Brand Comparison
The major EPA-listed short-term passive kits all use similar charcoal-canister or charcoal-liquid-scintillation chemistry. Practical differences come down to lab turnaround, price, and packaging:
AccuStar Charcoal Liquid Scintillation: $15-$25 with lab fee included. 3-5 business day turnaround. Used by the largest share of home inspection companies for buyer-side radon scope. Lab is well-established and provides clean PDF reports.
Airchek Short-Term Charcoal: $15-$25. Similar 4-day exposure protocol and turnaround. Mailing envelope and chain-of-custody form included.
RadonAway First Alert Radon Test Kit: $20-$30. 4-day charcoal canister. Slightly higher retail price reflecting branded retail distribution.
Pro-Lab Short-Term: $15-$25. Standard charcoal kit, common in big-box home improvement stores.
For long-term passive testing:
AccuStar Long-Term Alpha-Track: $30-$50. 90 days to 12 months exposure. Returns integrated annual-average reading.
Landauer Alpha-Track: $30-$50. Similar protocol. Common in commercial monitoring.
Continuous Monitor Brand Comparison
For homeowners considering a continuous monitor instead of repeated passive tests:
Airthings Corentium Home ($170-$220): Battery-powered, no app, displays 1-day/7-day/long-term averages on device LCD. Most reliable budget option.
Airthings View Radon ($200-$280): WiFi-connected, multi-sensor (radon, humidity, temperature), clean app interface. Best for smart-home integration.
RadonEye RD200 ($200-$260): Bluetooth-only, technical-user oriented, faster response time. Best for mitigation system tracking.
Airthings Wave Radon ($150-$200): Small wall-mountable BLE device. Requires Airthings hub for cloud features.
For broader detail on which monitor matches which household, see our companion guide on the best radon detector category overview.
Mitigation Cost Detail by Foundation Type
The cost of mitigation varies significantly with foundation type:
Poured concrete or concrete block basement with single suction point: $1,200 to $2,500. The most common Front Range scenario.
Poured concrete with multiple suction points: $2,000 to $3,500. Larger basements or those with internal walls dividing the slab.
Crawl space with vapor barrier and sub-membrane depressurization: $1,500 to $4,500. Common in older Colorado mountain and foothill homes.
Slab-on-grade with multiple suction points: $2,500 to $5,500. More complex because suction points must be drilled through finished flooring.
Combination basement + slab garage: $3,000 to $6,000. Higher complexity, two systems sometimes needed.
Older foundation with sealing challenges: $3,500 to $7,000. Additional sealing work on top of the standard system.
NRPP-certified mitigation contractors warranty their systems typically to below 4 pCi/L for 2 years. Some warranty to below 2 pCi/L for higher cost. The post-installation verification test is standard practice; without it, neither the buyer, seller, nor mitigation contractor can confirm the work is complete.
References
- EPA Radon Information and Action Levels — U.S. Environmental Protection Agency
- CDPHE Colorado Radon Program — Colorado Department of Public Health and Environment
- American Lung Association Radon Resources — American Lung Association
- CDC Radon Information — Centers for Disease Control and Prevention
Front Range homeowners ready to commission radon testing or follow up on an elevated reading can connect with us through the contact page for vetted NRPP/NRSB-certified testers and mitigation contractors in the Denver metro and wider Front Range.