Illinois radon requirements for new construction
420 ILCS 52 (Radon Resistant Construction Act); 32 Ill. Adm. Code 422.160In force since June 1, 1998
What your permit set must show
- Illinois mandates this by state statute (420 ILCS 52) and IEMA administrative rule (32 Ill. Adm. Code 422.160, the "Mitigation Standard for New Residential Construction"), not through a local IRC-appendix adoption, so the requirement applies statewide even where a municipality has not separately adopted a radon appendix.
- Covers all new one- and two-family residential construction statewide.
- Rule has been in force since June 1, 1998, making Illinois one of the earliest statewide mandates in the country.
Common questions
Does every new Illinois home need a radon system?
Yes. IEMA's Mitigation Standard for New Residential Construction (32 Ill. Adm. Code 422.160), issued under the Radon Resistant Construction Act (420 ILCS 52), applies statewide to new one- and two-family dwellings, independent of whether the local jurisdiction has adopted an IRC radon appendix.
Does RadonPlans produce packages for Illinois?
Not yet. Illinois regulates radon mitigation as a licensed activity, and we are still confirming how third-party rough-in design fits that licensing scope before offering packages here.