Radon mitigation

A system installed to reduce indoor radon levels, usually by venting sub-slab air outside. Standard fix when a radon test comes back high. Runs a few thousand dollars in most markets.

Inspections & appraisals · Updated September 2026

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Part 1 of 4

Why a seller cares

When a radon test comes back high, the fix is a mitigation system, and buyers usually ask the seller to install it. It is a known cost, a few thousand dollars, and it settles the issue for good.

Part 2 of 4

A simple example

The buyer's radon test reads 6.2 pCi/L. They ask for a mitigation system, installed by a licensed contractor before closing, with a post-installation test.

Radon mitigation: a simple example
What is agreedWhat it costs and settles
The seller installs a systemRoughly $1,000 to $2,500; the buyer gets a retest under 4
A credit instead of a systemThe same money; the buyer installs it after closing
The seller declinesThe buyer may walk under the inspection contingency

Mitigation is a fixed-cost fix for an invisible finding. Most sellers pay it and move on.

Part 3 of 4

What people get wrong

That a high reading means the house is dangerous to sell. It means it needs a fan and a pipe, which thousands of homes in the same county already have.

Part 4 of 4 · where to read next

Where it appears in the sale

What a definition is, and what it isn't

Keighbor is a software company, not a law firm, brokerage, or tax adviser. This is general information, not legal, tax, financial, or real estate advice about your sale. Your situation may differ. Before acting on a contract, disclosure, title, tax, or pricing question, ask an appropriately licensed professional in your state.

Written and researched by Keighbor Research · drawn from the reference glossary · how we research and check what we publish

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