Before You Finish Your Basement, Test for Radon
If you are planning drywall, flooring, ceilings, or built-ins, radon is easier to think through before everything is closed up.
It is easier to plan before finishes are in the way
Pipe routes, sump access, ceiling areas, and exterior exit points are easier to think through before finished materials are installed. The CDC recommends testing before major renovations when possible. A short conversation before the remodel continues can help avoid awkward routing later.
If your test comes back elevated, Bill can stop out, look at the house, and explain what makes sense before the basement is closed up.
What gets harder after the basement is finished
Finished ceilings can limit clean pipe routes.
Built-ins can block corners, walls, and mechanical access.
New flooring can make drilling and sealing more disruptive.
Hidden sump access can create problems for both radon and pump service.
Tight mechanical rooms leave fewer clean choices.
If your test comes back elevated
Bill can look at the house and explain the practical choices before the remodel continues. The goal is not to make the project bigger than it needs to be. It is to plan the system around the actual house while access is still available.
If your basement is already finished
You are not out of options. Radon systems can still be installed in finished homes. It just takes more care around routing, sump access, exterior placement, and the finished areas you want protected.
For a look at how installation day works, see what to expect during a radon mitigation install.
Good questions to ask before closing walls and ceilings
Where is the sump pit?
Is there crawlspace access?
Where could pipe route cleanly?
Where would an exterior fan make sense?
Will future access be blocked?
Still testing?
Testing is the only way to know the level in a specific home. If you are not sure what kind of test makes sense, start with our testing guidance.
Radon testing guidance - learn moreMore practical basement notes are collected in Household Tips From the Field.
Related radon guides
Sources & helpful radon resources
Last reviewed by American Radon Systems: June 2026
- CDC testing for radon in your home
Includes guidance on testing before major renovations and after work is completed.
- EPA explanation of the 4.0 pCi/L action level
Federal guidance on when EPA recommends fixing a home.
- Illinois IEMA-OHS Radon Program
Illinois radon program information for homeowners.
Before you close everything up
Call Bill or send your information. A short conversation now can save a lot of frustration later.