Radon Mitigation in Durham, NH

Radon does not know or care that your house has a landlord instead of an owner living in it. It moves the same way through a rental as it does through a house someone has lived in for thirty years. What changes in Durham is who ends up making the call, and how fast a decision has to happen once a test comes back high, especially mid-lease or mid-sale.

What it costs to fix radon in Durham

Most jobs run $1,950 to $2,250, with a full range of $900 to $6,000 depending on the house. The $50 test fee is credited toward the mitigation job if you move forward. New Hampshire requires a certified installer for this work, we hold that certification (RMS-113966) and are licensed and insured.

Reading a test result

Reading	What it means
Under 2.0 pCi/L	Below the level the EPA recommends aiming for
2.0 to 4.0 pCi/L	Worth considering mitigation, not mandatory
4.0 pCi/L or above	The EPA’s official action level

The US indoor average is about 1.3 pCi/L, so anything meaningfully above that is worth a second look even below the 4.0 action level.

What the install actually looks like

One hole, cored through the concrete floor, opening into a small pocket dug in the stone underneath. A PVC pipe glued into that hole runs up through the house and out above the roofline, with a fan pulling soil gas out from under the slab continuously. Most installs take a single day. If the house has a crawl space instead of a full basement, the same idea applies to a sealed membrane over the dirt instead of a slab.

What renting the unit out changes about testing

A landlord’s timeline for radon testing is not the same as an owner-occupant’s. Test between tenants if you can, with the unit closed up the way it will be during a heating season, rather than testing while someone is living there and running exhaust fans or leaving windows cracked, both of which throw the number off in either direction. If a lease is turning over and the last test is more than two years old, or you have never tested at all, that gap between tenants is the cleanest window to get an accurate read before someone new signs a year-long lease on the unit.

Frequently asked questions

What a recent customer said

Radon assessment went easy, install went easy, experienced and knowledgeable experts, radon levels dropped by next morning to well below EPA action levels. Great work!

Jerome Washo, 5 stars, Google review

EPA radon action level and testing guidance. 603 Basement Solutions radon certification RMS-113966. Review quoted verbatim, public Google review.