Indoor Air Quality
Radon Mitigation in Canada
Sub-slab depressurization is the most effective fix for elevated indoor radon. Use a C-NRPP certified professional for installation and post-mitigation verification.
Step by step
How it works
Standard mitigation process for Canadian homes
- 1
Confirm elevated levels with a long-term test
Mitigation decisions should be based on a 3+ month test result at or above 200 Bq/m³. Short-term tests can trigger unnecessary work or miss seasonal peaks.
- 2
Hire a C-NRPP certified mitigator
Certified professionals follow Health Canada and CSA standards. They assess your foundation type, soil conditions, and existing systems before quoting.
- 3
Install sub-slab depressurization
A PVC pipe and inline fan draw radon from beneath the slab and vent it above the roofline. This is effective for most basements and slab-on-grade homes.
- 4
Seal major entry points
Mitigators seal large cracks in the foundation, sump pit lids, and utility penetrations. Sealing alone is rarely sufficient but improves system performance.
- 5
Retest to verify results
Wait at least 24 hours after the system is running, then conduct a follow-up long-term or short-term verification test. Keep the fan running continuously.
Cost & coverage
Typical pricing
- Sub-slab depressurization
- $2,000–$4,000
- New construction rough-in
- $500–$1,500
- Annual fan electricity
- ~$50–$100/yr
Costs vary by foundation type, home size, and regional labour rates. Some provinces offer rebates or tax credits for radon mitigation.
Find a contractor
The Canadian National Radon Proficiency Program (C-NRPP) maintains a directory of certified measurement and mitigation professionals.
Find a C-NRPP professional →