What should I budget for radon mitigation in Calgary?

Radon mitigation in Calgary typically costs between $1,500 and $3,500 for a standard sub-slab depressurization system — the most common and effective solution for Alberta homes.

Calgary and the surrounding region sit in one of Canada's highest radon-risk areas. Health Canada's national radon map shows much of southern Alberta — including Calgary, Okotoks, Cochrane, Airdrie, and Rocky View County — with elevated radon potential due to the uranium-bearing geology beneath us. The Canadian guideline is 200 Bq/m³ (becquerels per cubic metre); if your home tests above that threshold, mitigation is strongly recommended.

What Drives the Cost

The most common fix is sub-slab depressurization (SSD) — a contractor drills through your basement slab, installs a pipe, and runs it to a fan that draws radon gas from beneath the foundation and exhausts it outside. For a typical Calgary bungalow or two-storey with a single basement slab, expect:

• Low end ($1,500–$1,800): Simple slab, good sub-slab communication, single suction point, straightforward exterior routing
• Mid-range ($2,000–$2,500): Most Calgary homes — one or two suction points, interior pipe routing up through the house and out the roof, standard fan
• High end ($2,800–$3,500+): Complex slab configurations (multiple sections, slab-on-grade additions, crawlspaces), difficult pipe routing, or homes with very high radon levels requiring more powerful fans

Crawlspace mitigation is handled differently — typically a sealed membrane and depressurization system — and can add $500–$1,500 to the cost depending on crawlspace size and condition.

Before You Mitigate — Test First

If you haven't tested yet, don't skip this step. A long-term radon test (90+ days, ideally over winter when windows are closed) gives the most accurate reading. Test kits run $30–$60 at hardware stores or through Health Canada's C-NRPP (Canadian National Radon Proficiency Program) certified testers. Professional testing with a certified device runs $150–$300. You want a baseline number before spending money on mitigation.

Calgary-Specific Considerations

Calgary's expansive clay soils can actually complicate sub-slab depressurization — clay doesn't allow air to move freely beneath the slab, which sometimes means multiple suction points are needed to achieve proper depressurization across the whole footprint. A good contractor will do a diagnostic test (drilling a small hole and checking airflow) before quoting to determine how many suction points your slab requires. If a contractor skips this step and just quotes a flat price without testing your sub-slab, that's a red flag.

Post-mitigation, your contractor should provide a post-installation test — ideally a short-term test 24 hours after system activation, then a follow-up long-term test. Most reputable systems bring levels down to under 100 Bq/m³, often well below that.

Professional Guidance

Radon mitigation is not a DIY project — proper system design, fan sizing, and pressure diagnostics require training. Look for contractors certified through C-NRPP (cnrpp.ca), which is the national certification standard for radon measurement and mitigation professionals. No permit is typically required for a standard SSD system in Calgary, but your contractor should be pulling any required electrical permits if they're hardwiring the fan.

Your next steps: Test your home if you haven't already (winter is the best time — windows closed, worst-case scenario reading). If you're above 200 Bq/m³, get two or three quotes from C-NRPP certified mitigation contractors. Browse certified professionals in our Calgary contractor directory at Calgary Construction Network to find local specialists serving the Greater Calgary area.