Short answer: most homes pay somewhere around $800 to $1,300 for a standard system, and complicated homes can pass $3,000.
- Angi’s 2026 figures, based on 1,184 projects, put a typical installation at $805–$1,326, with an average of $1,043 [ANGI].
- HomeAdvisor’s figures are similar: $786–$1,274, with an average of $1,028 [HA].
- State radon programs publish their own ranges, from $800–$1,200 (Pennsylvania DEP, Illinois IEMA) to $1,500–$3,000 (Minnesota Department of Health) [PA-1][IL-1][MN-1].
The rest of this guide explains where your home is likely to land and why.
Cost by system type
| System | Typical cost | When it’s used | Source |
|---|---|---|---|
| Active sub-slab depressurization (pipe and fan under the slab) | $1,000–$3,000 | Basements and slab-on-grade homes. The EPA calls it the most common method and usually the most reliable [EPA-3]. | [ANGI][HA] |
| Passive depressurization (pipe, no fan) | $500–$2,500 | Mostly built into new homes. It’s generally less effective at high levels than an active system [EPA-3]. | [ANGI][HA] |
| Activating an existing passive system (adding a fan) | about $500 | Newer homes with a radon-ready pipe already in place. | [CO-1] |
| Ventilation systems | $1,300–$2,500 | Homes where suction alone isn’t enough. | [ANGI] |
| Sealing only | $400–$4,600 | Not recommended on its own. The EPA does not recommend sealing alone to reduce radon [EPA-3]. | [ANGI] |
| Radon in well water (aeration or carbon) | $1,200–$5,000 | Homes on private wells with high radon in water. | [ANGI][HA] |
| Crawl space encapsulation, if needed | $1,500–$15,000 extra | Crawl spaces with an exposed dirt floor. | [ANGI][HA] |
Ranges are national survey figures from cost publishers, not quotes. Your installer’s price may be outside them.
Cost by foundation type
Public sources don’t publish reliable prices broken out by foundation type, so here’s how foundation type tends to change the job rather than a made-up number. (RadonCosts’s homeowner reports will add real medians per foundation type as they come in.)
- Full basement with a gravel layer under the slab: usually the simplest job. Air moves easily under the slab, so one suction point is often enough [EPA-3]. Expect the lower end of the ranges above.
- Slab-on-grade: the same sub-slab method. Price depends on where the pipe can run, either inside through a closet and attic or up the outside wall.
- Crawl space: the EPA says the most effective approach is sub-membrane suction, which means covering the dirt floor with heavy plastic and drawing radon from beneath it with a pipe and fan [EPA-3]. The plastic sheeting and sealing add materials and labor. A full encapsulation is a much bigger job ($1,500–$15,000 [ANGI]).
- Mixed foundations (for example a basement plus a crawl space or a slab addition): often need more than one suction point or a combined system, which raises the price.
- Block (hollow concrete) walls: may need block-wall suction or extra sealing [EPA-3].
- Homes with a sump pit: the sump may be sealed and used as the suction point [EPA-3]. A sealed, airtight sump lid is a common line item.
Cost by state (what state radon programs say)
| State | Published range | Who says so | Notes |
|---|---|---|---|
| Pennsylvania | $800–$1,200 | PA DEP news release, Jan 2025 [PA-1] | DEP’s older consumer booklet gives $500–$2,000, average $1,000 [PA-2]. |
| Illinois | $800–$1,200 | IEMA mitigation guide; IDPH FAQ [IL-1][IL-4] | Angi’s city figure for Chicago: about $1,200 [ANGI]. |
| Minnesota | $1,500–$3,000 | Minnesota Dept of Health [MN-1] | MDH warns that quotes under $1,000 are often “too good to be true” [MN-2]. |
| Iowa | $800–$2,500 | Iowa HHS radon fact sheet [IA-1] | |
| Ohio | “can cost $2,000 or more” | Ohio Dept of Health radon booklet, 2024 [OH-1] | ODH said this to explain why building radon-resistant features into new homes is cheaper. |
| Colorado | $1,300–$3,000 | Colorado Dept of Public Health and Environment [CO-1] | About $500 to add a fan to an existing passive system [CO-1]. Angi’s figure for Denver is about $800 [ANGI]. |
| New York | No state range found | Angi’s city figure for New York: about $1,400 [ANGI]. | |
| NJ, IN, KY, MI, WI | No state range found yet | Use national ranges until homeowner reports build up. |
State figures come from different years and methods, so compare them loosely. Some state booklets are several years old.
What pushes the price up or down
- What’s under the slab. Clean gravel lets one suction point do the job. Dense clay or soil may need two or more points [EPA-3].
- Pipe route. An interior route through a closet into the attic usually costs more in labor than an exterior route up the outside wall, but it’s quieter and better looking.
- Foundation mix. Crawl spaces, additions and block walls add work (see above).
- Starting radon level. Very high readings may call for a stronger fan, more suction points or extra sealing.
- Finished basements. Drilling and routing through finished space takes longer.
- Electrical work and permits. Permits typically run $25–$150, and some jobs need an electrician [ANGI][HA].
- Local market. Angi’s city averages range from about $700 (Kansas City) to $2,000 (Los Angeles) [ANGI].
- Deadline. Real estate deadlines can mean paying for a faster install date. (We’ll show whether installers offer rush service when they say so on their site.)
Costs after installation
- Electricity: the fan runs non-stop. Angi estimates $30–$300 a year depending on fan size [ANGI]. The EPA says fan systems “slightly increase” your electric bill [EPA-3].
- Fan replacement: the EPA says fans may last five years or more and maker warranties rarely exceed five years [EPA-3]. Pennsylvania DEP’s booklet puts a replacement at about $250–$350 with parts and labor [PA-2].
- Retesting: the EPA recommends a follow-up test within 30 days of installation (no sooner than 24 hours after it starts running), then retesting at least every two years [EPA-3]. A DIY kit is about $20–$30 [PA-1]. A professional test is roughly $150–$700 [ANGI].
- Extended warranties: about $200–$500 when offered [ANGI].
How to get a fair price
- Get two or three written quotes from certified or licensed installers. State programs and the EPA all recommend this [IL-1][EPA-3].
- Compare like with like: number of suction points, fan model, pipe route, sealing, the post-mitigation test, and warranty terms.
- Make sure the quote includes total price with taxes and permits, the warranty details, and who does the post-mitigation test [EPA-3].
- Be wary of very low bids. Minnesota’s health department specifically flags quotes under $1,000 [MN-2].
- Check prices people actually paid in your area on RadonCosts, and add yours afterwards.
What installers actually post online
We read the public websites of the companies in our directory across 12 states to find the prices they publish themselves. 42 of 328 installer websites we could read state a mitigation-system price or price range (crawl Nov 2, 2026). The lowest figure each one posts has a median of $1,200 (range $550–$2,500). These are the companies’ own advertised figures, sometimes for a specific job type (for example new construction or activating a passive system). They aren’t quotes:
- Athelon Radon Services: $550–$2,300 (source)
- Centennial Radon Solutions LLC: $800–$2,500 (source)
- Epic Radon Solutions, LLC: $800–$1,500 (source)
- Peak Environment: $800–$1,500 (source)
- Straight Answer Home Inspections LLC: $800–$1,500 (source)
- Problem Solved H.I.S., LLC: $850–$2,000 (source)
- Best Radon Solutions, LLC: $850 (source)
- Breathe Wright Radon & Air Quality Services: $900–$2,500 (source)
- GuardianPro Environmental: $900 (source)
Most installers don’t publish prices, so get written quotes. Each listing shows the posted figure, with a link to where we found it.
FAQ
Is radon mitigation worth it? The EPA estimates radon causes about 21,000 lung cancer deaths a year in the US, and it’s the leading cause among people who have never smoked [EPA-1]. The EPA also says systems can cut levels by up to 99% [EPA-3].
Can I install a system myself? In some states homeowners may legally work on their own home (for example Illinois and Iowa allow it for your own property [IL-1][IA-3]). The EPA and state programs recommend a qualified contractor, because a badly installed system can fail or create other hazards [IL-1][EPA-3].
Does a home sale change the price? The price of the work is the same, but deadlines can limit your choice of installer. See radon in real estate.
Prices are drawn from the sources cited and are not quotes. Figures marked as RadonCosts data come from homeowner reports and are shown with the number of reports.