Professional radon testing costs $145 to $714 for most homes, with a national average of $421 across 1,184 Angi projects.1 DIY test kits start at $10, and Thumbtack puts the professional average at $397. Prices below are national averages* for 2026.
*National averages, not local quotes. Your price depends on test type, home size, and location.
$421
average (Angi, 1,184 projects)
$397
average (Thumbtack)
$174.49
fixed-fee average (ProMatcher)
$10 – $40
DIY short-term kit (Angi)
What sources say
| Source | Figure | Dataset |
|---|---|---|
| Angi | $421 average; most pay $145 – $714 | 1,184 verified projects (2026) |
| HomeAdvisor | $421 average; $145 – $714 | Same Angi dataset |
| Thumbtack | $397 average; $243 – $650 range | Pro marketplace data (2025) |
| ProMatcher | $174.49 fixed-fee average ($162.87 – $186.11) | Fixed-fee quotes, typical 4-bedroom home |
A note on the data: Angi owns HomeAdvisor, and both pages show the same $421 average and $145 to $714 range; neither attributes the other, so we report them as matching figures, not corroboration. ProMatcher’s $174.49 fixed-fee average sits far below the Angi and Thumbtack figures; its quotes are fixed fees for a standalone test on a typical four-bedroom home, reported by inspectors.4 Thumbtack notes that radon testing is sometimes included as part of a larger home inspection package.3 Neither source reconciles the price gap, so get quotes scoped to your home.
Cost by test type (Angi)
| Test type | Average cost |
|---|---|
| DIY short-term kit (charcoal or liquid scintillation, 2-7 days) | $10 – $40 |
| DIY long-term kit (alpha track or electret, 90+ days) | $25 – $60 |
| DIY digital monitor (electronic, ongoing readings) | $100 – $250 |
| Professional test (certified pro, active or passive device) | $150 – $700 |
HomeAdvisor’s page reports a $146 average for home test kits and a $715 average for professional tests.2 Mailed-in DIY kits add lab analysis fees of $10 to $40, and expedited results add $20 to $50.1
Cost by home size (Angi)
| Home size | Average cost |
|---|---|
| Small home (about 1,200 sq. ft., single kit) | $150 – $300 |
| Medium home (about 2,500 sq. ft., two kits or multi-level) | $300 – $500 |
| Large home (4,000+ sq. ft., multiple kits) | $500 – $700 |
Larger homes need more kits or devices to cover basements, crawl spaces, and upper floors, which is why the ranges climb with square footage.1
DIY vs professional
DIY kits cost $10 to $60 plus possible shipping and lab analysis charges, while professional testing runs $150 to $700 and covers setup, sample collection, analysis, and a report.1 Professionals are recommended for real estate transactions or when official documentation is required; digital monitors cost more up front but can be reused, with periodic calibration adding to the total.1 Some pros charge $30 to $75 per hour instead of a flat fee.1
When to test and what a high reading means
Experts recommend retesting every two to five years, especially after renovations or after a mitigation system is installed.1 Thumbtack notes that homes testing at 4 picocuries per liter (4 pCi/L) or higher need mitigation, which typically costs about $1,200, with a range of $800 to $1,500 depending on house size and conditions.3 See our radon mitigation cost guide for the full breakdown.
Related guides
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Radon Mitigation Cost
Home Inspection Cost
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All cost guides
Sources
1. Angi — Radon Testing Cost
2. HomeAdvisor — Cost to Test or Remove Radon Gas
3. Thumbtack — Average Radon Testing Cost
4. ProMatcher — Cost of Radon Testing and Radon Mitigation