Not uncommon as in it's building code in those areas.
Tricky bit I think is when you live in a state with small pockets of radon instead of broad regions. Then you're back into crapshoot territory.
Tricky bit I think is when you live in a state with small pockets of radon instead of broad regions. Then you're back into crapshoot territory.
> Radon-resistant new construction (RRNC) typically costs a builder between $250 and $750. RRNC could cost less than $250 if the builder already uses some of the same techniques for moisture control.
https://www.epa.gov/radon/radon-resistant-new-construction-h...