Radon Mitigation Cost in Colorado (2026)

Colorado Radon at a Glance

Colorado averages 6.6 pCi/L indoor radon statewide — 65% above the EPA action level and among the five highest states in the country. The state geological survey estimates 50–70% of Front Range homes test above 4 pCi/L.

The reason: Colorado's Front Range sits directly on the Pikes Peak Granite and uranium-bearing sedimentary formations. Boulder County, Jefferson County, El Paso County (Colorado Springs), and Douglas County are particularly severe.

What Mitigation Costs in Colorado

Colorado runs higher than the national average — Denver metro contractors charge more than rural Midwest markets, and the prevalence of finished basements adds complexity.

Slab or Basement: $1,100–$2,500

• Simple slab, single zone: $1,100–$1,600
• Finished basement, standard routing: $1,400–$2,200
• Multiple zones or complex routing: $1,800–$2,800

Crawl Space: $3,000–$7,000

Colorado's mountain homes often have unusual foundation types — crawl spaces with poor access, stone foundations, and significant slope variations.

• Basic crawl space: $3,000–$4,500
• With vapor barrier: $3,500–$5,500
• Mountain property, difficult access: $4,500–$7,000+

What Drives Costs Up in Colorado

Finished basements: Colorado's cold winters push basement finishing rates higher than most states. Running pipe through finished walls, around HVAC equipment, and exiting through brick or stone adds time.

Mountain properties: Homes in the foothills and mountain communities (Evergreen, Boulder Canyon, Estes Park) have foundation types and access challenges that add $500–$1,500 to standard quotes.

Altitude and pressure: Sub-slab pressure dynamics are slightly different at altitude. Contractors familiar with Front Range conditions know how to account for this; inexperienced ones may not.

High radon levels: Many Colorado homes are well above 10 pCi/L, requiring higher-suction fans and sometimes multiple suction points.

Colorado's Active Radon Market

Colorado has one of the most mature radon mitigation markets in the country — which is good news. Contractors are experienced, competition keeps prices in check, and scheduling is generally fast (1–2 weeks). Don't skip getting at least 2 quotes.

Colorado Resources

• CDPHE Indoor Radon Program: 303-692-3090
• Colorado Radon Coalition: coloradoindoorair.org
• Verify NRPP certification: radonproficiency.org

Find certified radon mitigators in Colorado →