Guelph radon testing and mitigation

More than in central Toronto. Guelph's average home radon is around 80 Bq/m³, nearly double the GTA core average. About 10% of Guelph homes are estimated to test above the 200 Bq/m³ guideline. Testing is recommended.

Yes. Guelph is about 1 hour 15 minutes from our base, well within our 1.5-hour service radius. Same $99 pricing as GTA jobs, no distance surcharge. We service every Guelph neighbourhood including Old University, Exhibition Park, Sunny Acres, Pineridge, Westminster Woods, Kortright, Two Rivers, Brant, Onward Willow, and the downtown core.

Bedrock geology. Guelph sits on Lockport Group dolostone, a carbonate bedrock with naturally higher uranium content than the glacial till that underlies most of the GTA core. Higher bedrock uranium means higher radon emission into soil gas. Combined with Guelph's older housing stock (especially in the University area, Exhibition Park, and the historic core), the higher community average is well-explained.

Old University area, Exhibition Park, the downtown core, and Brant tend to top the list because of pre-1970 housing with stone or block foundations and basement living space. Newer Westminster Woods, Pineridge, and Kortright subdivisions test lower on average but can still spike in individual homes. We have a separate detailed guide: see our blog post on Radon Mitigation in Guelph.

Yes if purchased from a builder on or after Feb 1, 2021 and inside the 7-year Tarion warranty. Given Guelph's 10% above-guideline rate, the Tarion claim path is especially worth knowing about for new-build owners. C-NRPP certified test at or above 200 Bq/m³ triggers builder-funded mitigation up to $50,000. Most Guelph new-build owners we test for had no idea this coverage existed.