Radon Mitigation Cost in Colorado

If you just want the short answer: most Colorado radon mitigation systems land between $1,000 and $2,000. That's the range CDPHE uses for a standard single-family install, and it's the same range El Paso County Public Health publishes locally.^[1][2]

The longer answer is the one you're probably looking for. A real quote on your Colorado home can come in anywhere from $900 to $4,800+ depending on your foundation, your soil, your finishes, and your routing. This page walks through that spread by scenario, what every honest Colorado quote should include, and how to read the difference between a fair $1,400 quote and a fair $3,200 quote — because both can be honest, on the same street.

Cost pages that just quote a national average leave you guessing. Here's what Colorado homeowners actually pay, broken out by the scenario that matches your home. Use this to orient a quote you've received — not to argue with a contractor before they've seen your basement.

Bands compiled from CDPHE, El Paso County Public Health, Angi, CostWhale, ProMatcher, InspectAndTest, and Colorado Springs contractor public pricing, 2024–2026.

Four things move a Colorado quote that don't show up in a national average:

Altitude affects fan sizing

Radon fans lose roughly 4% of their airflow capacity for every 1,000 feet of elevation.^[3] Denver sits at 5,280 feet. Colorado Springs is closer to 6,000. That means a fan model that's perfectly sized for sea-level installs may need to be upgraded — or the system may need a second suction point to compensate. A contractor working only off a national catalog spec is more likely to under-fan a Colorado home, and you'll see it in the post-mitigation test result.

Front Range geology pushes some homes higher

Colorado's uranium-bearing granites and shales sit beneath most homes along the Front Range. That doesn't change the install price directly, but it does mean homes here tend to start with higher radon and may need a more robust system to bring levels below 4.0 pCi/L.^[1]

State-licensed contractor density

Colorado is one of the few states with state-level radon contractor licensing — through the DORA Office of Radon Professionals.^[4] Quotes from DORA-licensed contractors will reflect the cost of training, certification, and insurance that an unlicensed handyman wouldn't carry. That's not a markup; it's the work being done correctly.

Real estate deadline pressure

Colorado real estate transactions move quickly. Mitigations done under closing-deadline pressure sometimes carry a small premium for guaranteed-completion scheduling. If you're under contract, see our real-estate deadline cost page.

If a written quote is missing one of these line items, it's not necessarily padded — but it is incomplete. Ask before you sign.

• DORA license number — required for any contractor performing radon mitigation in Colorado^[4]
• NRPP or NRSB certification — national professional credential, looked up at nrpp.info or nrsb.org
• Number of suction points and where they'll go
• Fan model and warranty — typically 5 years on a name-brand fan
• Pipe routing — interior vs exterior, where it exits, and how high above the roof
• Sealing scope — slab cracks, sump cover, floor-wall joint, slab penetrations
• Manometer install location (you should be able to see it from a normal walking path through the basement)
• Permit responsibility — electrical and mechanical permits, who pulls them
• Post-mitigation test — within 30 days of install, 2–7 day duration, closed-house conditions^[5]
• Workmanship warranty — usually 1–2 years labor, separate from fan warranty
• Itemized add-ons — anything not included (debris removal, drywall touch-up, aesthetic options) priced separately, not hidden

The trap is comparing the bottom-line numbers. Compare scope first, numbers second.

1. Same scenario? Make sure both contractors are quoting the same foundation work. A $1,400 basement quote and a $3,200 crawlspace quote aren't comparable.
2. Same number of suction points? If one quote has one and the other has two, the work is genuinely different.
3. Same fan? An RP145 and a GP500 are sized for different soil types. A contractor specifying a smaller fan may be optimizing for cost; a contractor specifying a larger one may be planning for tight soil.
4. Same exhaust? Above the roof costs more than exterior wall above the eave. Both can be code-compliant; one may be more aesthetic.
5. Same post-mit test? A contractor who skips this is the cheaper bid for a reason.
6. Same warranty? 1-year vs 5-year workmanship matters.

If one quote is significantly higher after all of that lines up, ask the contractor what they're doing differently. There's usually an honest answer — multiple suction points after a diagnostic test, a heavier vapor barrier in a crawlspace, an interior routing aesthetic upgrade — or there isn't, and you have your decision.

The $1,000–$2,000 figure is for a standard single-family install. Plan for the higher end (or above) if any of these apply to your home:

• Crawlspace (full or partial) under any portion of the home
• Tri-level, split-level, or addition that created a multi-zone foundation
• Finished basement where pipe must run inside
• Sump pit needs full sealing and a new lid
• Soil is tight clay (more common in some Front Range subdivisions)
• Electrical panel is at capacity (a sub-panel adds cost)

Plan for the lower end if your home is a single-zone basement on porous gravel, you already have a passive radon rough-in from new construction, and you don't need interior routing.