Radon mitigation cost by system
| Type of system | Installed price | Good to know |
|---|---|---|
| Active soil depressurization (fan and pipe under the slab) | $1,000–$2,500 | A fan and pipe pull radon from under the slab and vent it above the roof |
| Drain-tile suction | $900–$1,800 | Uses an existing drain-tile loop to pull radon out |
| Sealed sump pit | $900–$2,500 | Seals the sump lid and vents it |
| Block-wall depressurization | $1,800–$3,000 | Vents the hollow cavities in a block foundation wall |
| Passive soil depressurization (no fan) | $500–$2,500 | Pipe only, no fan; relies on natural airflow |
| Ventilation (HRV or ERV) | $1,300–$2,500 | Brings in fresh air; priced by HomeGuide and Angi |
HomeGuide puts the national average at $1,600, typically $1,200 to $2,000, with a minimum of $500 and a maximum of $8,000. Angi puts the average at $1,043, typically $805 to $1,326, from 1,184 projects. Angi contradicts itself on active suction, at $1,000 to $3,000 in its table and $805 to $1,326 in its summary, and elsewhere says a system might cost $400 to $1,800. Forbes Home puts the average at $1,000, with active sub-slab systems at $1,000 to $2,500, drain tile at $700 to $1,500 and a sealed sump at $800 to $2,500, in line with the table above.
Cost with a test and a permit
| System | System only | With a professional test | With a test and a permit |
|---|---|---|---|
| Active soil depressurization | $1,000–$2,500 | $1,130–$3,200 | $1,150–$3,350 |
| Drain-tile suction | $900–$1,800 | $1,030–$2,500 | $1,050–$2,650 |
| Sealed sump pit | $900–$2,500 | $1,030–$3,200 | $1,050–$3,350 |
| Block-wall depressurization | $1,800–$3,000 | $1,930–$3,700 | $1,950–$3,850 |
| Passive soil depressurization | $500–$2,500 | $630–$3,200 | $650–$3,350 |
| Ventilation (HRV or ERV) | $1,300–$2,500 | $1,430–$3,200 | $1,450–$3,350 |
Sealing a basement is not in the calculator, because the guides disagree: Angi puts it at $400 to $4,600, HomeGuide at $6,000 to $18,000 and Forbes Home at $4,000 to $7,000. Neither HomeGuide nor Angi prices a crawl space sub-membrane system or sub-slab depressurization on its own line.
What changes the price
- Type of system. An active system with a fan is the usual choice, and a passive system without one is cheaper.
- Foundation. Slab, basement, crawl space and block walls each need a different layout.
- House size. Larger homes need more suction points or a stronger fan.
- Pipe route. A longer run to the roof or through finished space costs more.
- Wiring. The fan needs power, and a new circuit adds to the bill.
- Where you live. The calculator adjusts the labor share for your state's plumber wages.
Extras to expect
| Item | Typical cost | When it applies |
|---|---|---|
| Professional radon test | $125–$700 | Before you decide on a system |
| Continuous radon monitor | $150–$300 | To watch the level afterward |
| Larger home or tricky foundation | $500–$1,500 | When the quote runs high for size |
| Crawl space encapsulation | $1,500–$15,000 | Crawl space homes with a membrane |
| Extended warranty | $200–$500 | When the contractor offers one |
| Permit | $25–$150 | When it is not in the estimate |
Radon often comes up alongside other below-grade work: see basement waterproofing cost, crawl space repair cost and sump pump installation cost. For cracks that let gas in, see foundation repair cost. Related jobs: mold remediation cost, French drain installation cost and insulation cost.
Questions to ask before you hire
- Are you certified or licensed for radon mitigation in this state?
- What type of system do you recommend for my foundation, and why?
- Does the price include sealing cracks, the fan, the pipe, the wiring and the permit?
- Do you test after the system is installed, and is that in the price?
- What is the fan warranty, and how long does the fan usually last?
Methodology and sources
We price each type of system from published guides, take the middle of their lows, midpoints and highs, and adjust the labor share for your state's wages. Forbes Home is used as an independent cross-check. Read how we estimate costs.
- HomeGuide: radon mitigation cost — price by system, testing, extras
- Angi: radon mitigation cost — national average, price by system, extras
- Forbes Home: radon mitigation system cost — used as an independent cross-check
- BLS OEWS May 2025, State (SOC 47-2152, Plumbers) — state labor index
What each source reports
Our estimate does not rely on any single page. This table lists each page we used and the figures it reports, so you can see where the ranges come from.
| Source | What it reports |
|---|---|
| HomeGuide |
|
| Angi |
|
Common questions about radon mitigation costs
How much does radon mitigation cost?
A typical job (active soil depressurization) comes to about $1,600 nationally, within a range of $1,000 to $2,500. Use the calculator above to adjust for your state, the options you choose and any extras.
How much does a radon mitigation system cost?
An active soil depressurization system, the most common type, costs about $1,000–$2,500. HomeGuide puts the national average at $1,600 and Angi at $1,043.
How much does radon testing cost?
About $125–$700 for a professional test, according to HomeGuide and Angi. A home test kit costs $10 to $30 at HomeGuide and $15 to $60 at Angi.
Is a passive radon system cheaper than an active one?
Usually. A passive system has no fan and costs about $500–$2,500 against $1,000–$2,500 for an active one, though the two ranges overlap. It only works when the radon level is low enough.
How much does drain-tile suction cost?
About $900–$1,800, according to HomeGuide.
How much does it cost to seal a sump pit for radon?
About $900–$2,500, according to HomeGuide.
How much does block-wall radon mitigation cost?
About $1,800–$3,000. Angi puts wall-based systems at $500 to $3,000.
Does a bigger house cost more to mitigate?
Yes. Angi puts larger homes at $500 to $1,500 more, about $500–$1,500, and HomeGuide puts larger homes at $2,500 or more.
Does the cost include a permit?
Usually, because HomeGuide says the permit of $25 to $150 is normally in the contractor estimate. If it is not, add about $25–$150.
How much of the cost is labor?
Neither guide gives a labor share. The calculator uses 50% as an estimate, which only sets how much of the price moves with state wages.
Where do these prices come from?
They come from 2 published cost pages from 2 publishers, last checked Oct 10, 2026. We report what those pages say and do not invent figures; the table above shows each source.
How does my state change the estimate?
The labor part of the price is scaled by the average wage for the relevant trade in your state, using Bureau of Labor Statistics data. Materials and equipment are not adjusted.
Why might a contractor's quote differ from this estimate?
A quote reflects your specific scope, access, local demand and what the contractor includes. Ask for line items rather than a single total so you can compare bids on the same basis.
All 2 sources behind these prices
Every figure in the calculator comes from one or more of these pages, with the number each one supports in the link text.