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Flat illustration of a low-rise commercial building.
Does My Workplace Need Radon Testing? Federal and Provincial Rules
Federal (banks, airlines, railways, interprovincial trucking, marine, pipelines, telecom, broadcasting, postal and courier, grain elevators, Crown corporations, First Nations band councils, federal public service): a hard 200 Bq/m³ annual-average limit... Read more...
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Can't Test Every Building This Season? How Phased Radon Compliance Works
There is no published scheme granting extensions for radon. Read more...
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Post-Mitigation Radon Verification: Who Should Test After the System Goes In
Start a short-term test at least 24 hours after the fan is activated, ideally in the same locations originally measured. Follow it with a long-term test of at least three... Read more...
Flat illustration of a small puck-shaped radon detector on a floor in an empty room.
Does a Certified Professional Have to Do Your Radon Testing?
The Canada Occupational Health and Safety Regulations require the employer to appoint a "qualified person," defined as someone who, because of their knowledge, training and experience, is qualified to perform... Read more...
Flat-vector house cross-section with a radon vent pipe rough-in under the slab — Quebec Building Code and radon
Quebec's Building Code and Radon: The Mandatory Pipe Is Not Enough
Does the Quebec Building Code protect against radon? Only partly. Since June 2, 2022, the Code has required a sub-slab pipe and a passive extraction column in the new buildings... Read more...
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Radon at Work: A Guide for Workers and Health & Safety Committees
The short version: Ask whether the building has been tested, in writing, through your committee. A proper test is long-term (3+ months, heating season), with a detector in every occupied... Read more...
Flat illustration of a multi-storey care facility with a covered entrance.
Radon in Hospitals, Care Facilities and Correctional Centres
Health Canada treats these buildings as "dwellings" for testing purposes because of high occupancy of long duration. Most are provincially regulated, so no radon-specific limit applies — but staff are... Read more...
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Radon, HVAC and Ventilation in Canadian Workplaces
Buildings pull soil gas in through stack effect and mechanical imbalance. Read more...
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Radon for Landlords, Property Managers and Multi-Unit Buildings
No Canadian jurisdiction requires landlords to test for radon. Read more...
Flat illustration of a low-rise commercial building.
Our Radon Result Came Back at 180 — Are We Finished?
200 Bq/m³ is an action level, not a safety threshold. Radon moves year to year with weather and building operation. Every measurement carries uncertainty, so a reported 180 sits in... Read more...
Flat illustration of a house frame on a foundation slab with a vertical pipe stub inside the footprint.
Radon Rough-In Inspection: A Guide for Builders and Building Officials
The inspection happens before the slab is poured, because most of what matters is buried afterward. It covers the gas-permeable layer, the soil gas barrier, the collector and pipe, sealing... Read more...
Flat illustration of a house frame on a foundation slab with a vertical pipe stub inside the footprint.
Is a Radon Rough-In Mandatory in My Province?
Ontario (2024 OBC, in force since 1 January 2025), British Columbia (2024 BCBC, in force since 8 March 2024) and Quebec (Construction Code) all require radon rough-in provisions in new... Read more...
Flat illustration of a house frame on a foundation slab with a vertical pipe stub inside the footprint.
Radon Rough-In Requirements for Canadian Builders
The 2025 NBC requires a passive vertical radon stack — a pipe from beneath the slab through the roof, ready to accept a fan. But BC, Alberta, Ontario and Quebec... Read more...
Flat-vector office workplace with a radon detector and hard hat — radon at work in Quebec (CNESST)
Radon in the Workplace in Quebec: The Employer's Obligations (CNESST)
Quick answer: Yes — but the details matter. In Quebec, the provincial occupational health and safety regime — the Act respecting occupational health and safety (LSST), enforced by the CNESST... Read more...
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Radon in the Canadian Workplace: A Legal Brief
Federally regulated employers must ensure no employee is exposed to an annual average above 200 Bq/m³ from January 30, 2027 (COHSR s. 10.26(4), as amended by SOR/2026-10). Read more...