Radon Mitigation Cost in Colorado (2026)
What Colorado homeowners typically pay for radon testing and mitigation, by service and by home type, plus the factors that move the price.
Updated November 2026
Short answer: Most Colorado homeowners pay $1,000–$2,500 for a standard active sub-slab depressurization system. The Front Range median is about $1,500. Crawlspaces, finished basements, multiple foundations and mountain homes cost more.
Radon costs by service
| Service | Typical cost | What it covers |
|---|---|---|
| DIY short-term radon test kit | Free to $30 | CDPHE gives out free kits each winter while supplies last. Store kits typically cost $15 to $30 including lab fees. |
| Professional radon test | $150 to $300 | A certified tester places a continuous monitor for at least 48 hours. Often requested during a home sale. |
| Standard sub-slab depressurization (basement) | $1,200 to $2,000 | The most common Colorado system: a sealed pipe through the slab, an inline fan and an exhaust above the roof. Front Range median is about $1,500. |
| Simple basement system (ranch, unfinished basement, sump pit) | $1,000 to $1,200 | Low end of the range. Easy access and an existing sump pit keep labor down. |
| Post-mitigation test | Usually included | A follow-up test after the system runs at least 24 hours. Confirm it is included in your quote. |
| Radon fan replacement | $400 to $700 | Fans typically last 5 to 10 years. Price includes the fan and labor. |
| Permit (where required) | $50 to $200 | Some Colorado municipalities require a permit for radon system installation. |
| Annual operating cost | $100 to $300 / year | Electricity for a fan that runs 24 hours a day. |
Radon mitigation cost by home type
Total installed cost for a typical single-family home, including a post-mitigation test.
| Home or foundation type | Typical cost | What it covers |
|---|---|---|
| Unfinished basement | $1,000 to $1,800 | Pipe can run straight up through the house or garage with little finish work. |
| Finished basement | $1,400 to $2,500 | Adds $200 to $500 to route pipe through closets, chases or the garage. |
| Slab-on-grade | $1,400 to $2,500 | Adds $200 to $500 for exterior routing and insulated pipe. |
| Crawlspace | $1,500 to $2,800 | Adds $300 to $800 for a sealed vapor barrier with suction underneath. |
| Basement plus crawlspace (multiple foundations) | $1,800 to $3,400 | Each added foundation section needs its own suction point, adding $300 to $600 each. |
| Very high readings (20+ pCi/L) | Add $200 to $500 | May need a larger fan or more suction points to reach the target level. |
| Mountain and rural homes | $1,500 to $3,000+ | Rocky soil, snow-load requirements, HOA rules and contractor travel can add cost. |
| Commercial, multifamily and schools | Custom quote | Priced by building size, foundation and number of systems. |
What affects the price of a radon system
Foundation type. Basements are usually the simplest. Crawlspaces need a sealed plastic membrane, and slab homes often need exterior pipe routing.
Number of suction points. Homes with additions or more than one foundation type may need a suction point for each section, adding $300 to $600 each.
Finished spaces. Running pipe through finished walls, closets or the garage takes more labor than an unfinished basement.
Soil under the slab. Tight clay or rock under the slab can require a stronger fan or extra suction points to reach the target level.
Starting radon level. Readings above 20 pCi/L may need a larger system, adding $200 to $500.
Location. Mountain and Western Slope homes often cost more because of rock, snow-load requirements, HOA rules and contractor travel.
Radon mitigation cost by Colorado city
| City | Typical installed cost |
|---|---|
| Denver | $1,200 to $2,000 for a standard basement system, with most quotes near the Front Range median of about $1,500. |
| Colorado Springs | $1,200 to $2,200 for most single-family homes. Homes on the west side and in the foothills can cost more where rock or steep lots complicate routing. |
| Aurora | $1,100 to $2,000 for most homes. Newer tract homes with unfinished basements are often at the lower end. |
| Fort Collins | $1,200 to $2,000 for a standard basement system. Older homes near Old Town with crawlspaces can reach $2,500 or more. |
| Greeley | $1,100 to $2,000 for most homes. Farmhouses and homes with additions on different foundations can run higher. |
| Pueblo | $1,000 to $2,000 for most homes. Crawlspace homes, common in older neighborhoods, usually add $300 to $800. |
| Grand Junction | $1,200 to $2,200 for most homes. Fewer local contractors on the Western Slope can mean higher prices or travel fees. |
| Breckenridge | $1,500 to $3,000 for most mountain homes. Crawlspaces, rock, snow load and contractor travel push prices above Front Range rates. |
| Durango | $1,300 to $2,500 for most homes. Crawlspaces, rocky lots and contractor travel can add to the price. |
Radon mitigation cost FAQ
What is the average cost of radon mitigation in Colorado?
The typical range on the Front Range is $1,000 to $2,500, with a median of about $1,500 for a standard basement system.
Why do radon mitigation quotes vary so much?
Price depends on the foundation type, how many suction points are needed, whether the basement is finished, how the pipe is routed, the starting radon level and contractor travel.
Is the follow-up radon test included?
Most certified contractors include a post-mitigation test in the price. Confirm this in writing before you sign.
How long does a radon fan last?
Most fans last 5 to 10 years. Replacement typically costs $400 to $700 including labor.
Can I install a radon system myself?
DIY kits exist, but a certified contractor will diagnose the soil under your slab, size the fan correctly and verify the result with a follow-up test. Many buyers and lenders also expect professional installation records.
Cost ranges reflect typical 2026 Colorado pricing reported by contractors and published cost guides. Your price depends on your home. Always get a written quote from a certified contractor.
Sources
- Colorado Department of Public Health and Environment — Radon program
- CDPHE press release: Colorado residents urged to test homes for cancer-causing radon
- Colorado DORA: Radon professional licensing (House Bill 21-1195)
- U.S. EPA — What is EPA's action level for radon and what does it mean?
- Symonds P. et al., Home energy efficiency and radon: an observational study, Indoor Air (2019)
- La Voz Colorado: Half of Colorado homes have elevated radon levels (January 2026)
- Larimer County Health Department: Radon Action Month (January 2026)
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