Are you buying a new house directly from a builder?
At some point that house might need a radon system. Many of the procedures used to mitigate radon are cheaper to do if they’re done while the home is being built.
These procedures include:
- Placing a 4-inch layer of gravel beneath the slab
- Installing plastic sheeting above the gravel
- Installation of a vent pipe
- Sealing and caulking small openings between the walls and the foundation
- Installing an electrical junction box that can be used for a fan if necessary
You can ask a builder to include these construction features. It will usually cost more but you’ll almost certainly save money if a radon system is needed later.
Here is a link to a page at the Environmental Protection Agency with more detailed information about radon resistant new construction.