What's the cost of radon mitigation in a Metro Vancouver basement?

Radon mitigation in a Metro Vancouver basement typically costs between $2,000 and $5,000 for a standard sub-slab depressurization system, which is the most common and effective method. Testing comes first and costs only $30 to $150 for a DIY test kit or $150 to $400 for a professional measurement — a small investment that could protect your family's long-term health.

Radon is a naturally occurring radioactive gas that seeps up from the ground through cracks and gaps in foundation slabs and walls. It is colourless and odourless, so the only way to know if your home has elevated levels is to test. Health Canada has set the guideline level at 200 becquerels per cubic metre (Bq/m3) — if your basement tests above this threshold, mitigation is recommended. Radon is the second leading cause of lung cancer after smoking, and because it accumulates in enclosed below-grade spaces, basements are the primary area of concern.

Metro Vancouver's radon risk varies by neighbourhood and geology. Granitic bedrock areas — parts of the North Shore, Coquitlam, and Burnaby near the mountains — tend to have higher radon concentrations because granite naturally contains more uranium, which decays into radon. Fraser River delta areas like Richmond, Delta, and parts of Surrey sit on thick alluvial deposits that can either trap or dilute radon depending on local conditions. The only way to know your home's radon level is to test — neighbourhood averages are not reliable predictors for individual homes because radon entry depends on specific soil conditions, foundation integrity, and how the house interacts with the ground.

The standard mitigation approach is a sub-slab depressurization (SSD) system. A certified radon mitigator drills a hole through the basement concrete slab, installs a suction point connected to PVC piping that runs up through the house and exits through the roof, and attaches a continuously running inline fan that creates negative pressure beneath the slab. This draws radon gas from under the foundation and vents it above the roofline where it disperses harmlessly. A basic SSD system costs $2,000 to $3,500 in Metro Vancouver. More complex installations — homes with multiple foundation sections, thick gravel beds, or difficult routing for the vent pipe — can run $3,500 to $5,000.

Additional mitigation measures may be recommended depending on your home's construction. Sealing visible cracks in the foundation slab and walls ($200 to $500) reduces radon entry points. Sealing the sump pump pit with an airtight cover ($150 to $400) prevents radon from entering through the open pit. In some cases, improving ventilation with an HRV (heat recovery ventilator) system can reduce radon levels in mildly elevated homes — though an HRV alone ($3,000 to $6,000 installed) is typically not sufficient for levels significantly above the 200 Bq/m3 guideline.

If you are planning to finish an unfinished basement, test for radon before you start. It is far easier and cheaper to install a radon mitigation system — or at minimum a radon rough-in (passive pipe through the slab ready for a fan if needed later) — before the slab is covered with flooring and the walls are framed and drywalled. A radon rough-in during construction or renovation costs only $500 to $1,000 and saves thousands if mitigation is needed later. Retrofitting a system after the basement is fully finished requires cutting through finished flooring and routing pipes through completed walls and ceilings.

Radon testing should be done during the heating season (October through April) when windows and doors are typically closed and radon accumulation is highest. Long-term tests (90 days or more) provide the most accurate reading. Health Canada and the Canadian National Radon Proficiency Program (C-NRPP) are the authoritative resources, and mitigation should be performed by a C-NRPP certified professional. Your local municipality does not typically require a building permit specifically for radon mitigation, but if the work is part of a larger basement renovation, it should be included in the overall project scope. Need help finding a basement contractor who understands radon considerations? Vancouver Basement Finishing can connect you through the Vancouver Construction Network.

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