Radon Mitigation Cost Calculator

Most homes pay $1,200 to $2,000 for a sub-slab radon mitigation system, according to HomeGuide's February 2026 survey. Pick your foundation and options below for a range to compare quotes against. The math runs in your browser.

Worked example

Worked example: an 1,800 sq ft home on a basement slab, a sub-slab system with one suction point, the pipe up an exterior wall, a permit required and a professional retest. The low ends add to the low total and the high ends to the high total. EPA's 2010 guide gave $800 to $2,500 for sub-slab suction, in 2010 dollars, so the result sits where both sources overlap.

How the radon cost calculator works

It starts from a published installed-cost range for the system that fits your foundation: $1,200 to $2,000 for sub-slab depressurization, $900 to $1,800 for drain-tile suction and $1,800 to $3,000 for block-wall depressurization (all HomeGuide, Feb 2026), or $1,000 to $2,500 for a crawlspace membrane system (EPA's 2010 Consumer's Guide, in 2010 dollars). It then applies three multipliers we estimate, each labeled est.: a larger footprint (×1.25 at 2,500 sq ft or more), a mixed foundation that needs a second suction area (×1.5), and an interior or attic pipe route (×1.15). Extra suction points add an estimated $250 to $500 each. The permit ($25 to $150) and retest ($125 to $400 professional, or a $10 to $30 kit) come from HomeGuide. Low ends add to the low total and high ends to the high total, rounded to the nearest $10.

Which system fits your foundation

EPA's Consumer's Guide lists sub-slab suction as the most common method for basement and slab homes, and notes it works best if air can move easily in the material under the slab. Homes with an existing perimeter drain can use drain-tile suction. Hollow block walls can be depressurized directly. Crawlspaces are usually covered with a sealed plastic membrane, with suction underneath (submembrane depressurization). Sealing the sump pit and major cracks supports all of these methods.

Is my radon quote fair?

A complete bid names the system type and number of suction points; the fan model and its warranty; where the pipe runs and exits (EPA guidance is to vent above the roofline); what gets sealed; who pulls the permit; and who does the post-mitigation test, and when. If a quote is far above your range, ask which line explains the gap. Mixed foundations and very high starting levels are common reasons.

Two more examples

A 2,800 sq ft home with hollow block basement walls: block-wall depressurization at $1,800 to $3,000 (HomeGuide) × 1.25 for size (est.) = $2,250 to $3,750; plus a permit ($25 to $150) and a professional retest ($125 to $400) (HomeGuide) = $2,400 to $4,300.

A 1,600 sq ft home with a basement plus a crawlspace addition: a sub-slab system at $1,200 to $2,000 × 1.5 for the mixed foundation (est.) = $1,800 to $3,000; plus the permit and retest = $1,950 to $3,550. If your quote sits inside your range, the price is in line with national survey data. If it sits well above, ask which line explains the gap.

Running cost after installation

EPA's 2010 table put fan electricity plus heated or cooled air loss at $50 to $200 a year for sub-slab systems (2010 dollars). Retest every two years and after major renovations (EPA Consumer's Guide).

Your area

See your county's EPA zone and any state test data with the radon levels by ZIP tool, read the radon mitigation cost guide, or open a state guide for licensing rules and county results:

• Radon in Pennsylvania: Results by ZIP, Rules and Cost
• Radon in Ohio: County Levels, Licensing and Cost
• All guides

Steps

1. Step 1: Confirm your test result (EPA: fix at 4 pCi/L or higher).
2. Step 2: Run the calculator with your foundation.
3. Step 3: Check the installer's state credential.
4. Step 4: Get two itemized bids.
5. Step 5: Retest after the system runs for at least 24 hours (EPA Consumer's Guide).

Questions

Sources

• HomeGuide, Radon Mitigation Cost (Feb 5, 2026)
• EPA, Consumer's Guide to Radon Reduction (2010 edition, archived)
• EPA, Consumer's Guide to Radon Reduction (2016)
• EPA, A Citizen's Guide to Radon (2016)