In Ontario, Tarion protects homeowners by licensing builders and administering the statutory new home warranty plan. The statutory warranty provides coverage for excessive levels of radon. The coverage limit for radon remediation is $15,000 and coverage lasts for seven years from home's original date of possession.

In order for a radon claim to be accepted, a homeowner must provide the following supporting material:

• the test result identifying average radon levels in basement (finished or unfinished, but not from crawl space);
• the identification of test methodology as per Health Canada's "Guide for Radon Measurements in Residential Dwellings (Homes)", and
• the test measurements and results from a certified professional by the Canadian National Radon Proficiency Program (C-NRPP).

Similar programs may exist in other provinces or with individual builders.

For more information on new home radon coverage, refer to http://www.tarion.com/.