Short answer
Most single-family sub-slab radon mitigation systems in Canada cost roughly $2,000 to $3,500 installed, including the fan, piping, sealing and a manometer. Homes with several foundations, finished basements that need careful routing, crawlspaces or multiple suction points can cost more. Long-term DIY test kits cost well under $100. Running costs are a small amount of electricity for the fan.
Key facts
- Typical installed system: about $2,000–$3,500.
- Complex homes: more, sometimes $4,000–$6,000.
- DIY long-term test kit: well under $100.
- The price is the same whether your level is 210 or 610.
Typical price ranges
Ranges reflect published Canadian estimates and typical market pricing. They are not quotes. We provide a fixed price after a site assessment.
What drives the price
- What’s under the slab. Clean gravel lets suction spread easily, so one suction point often covers the whole floor. Dense soil or no gravel layer may need more suction points or a stronger fan. The communication test tells us which.
- Number of foundations. Additions, crawlspaces and attached garages on separate foundations may each need treatment.
- The pipe route. An exterior route or a straight shot through an unfinished utility room is quicker than routing through finished living space to the attic.
- Sealing work. Sumps, floor drains, large cracks and open block walls add time and materials.
- Crawlspaces and earth floors, which need a sealed membrane.
- Heritage and finish requirements, such as concealed routes or colour-matched exterior pipe.
Running costs
The fan runs continuously. Radon fans typically draw roughly 20 to 90 watts, so the electricity cost is modest, comparable to leaving one or two light bulbs on. There’s also a small heat loss from conditioned air drawn through the slab, minimized by good sealing. Fans generally last many years and are a straightforward replacement when they wear out.
Is it worth it at 200-something?
The cost of a system doesn’t change much with the radon level: you pay about the same to fix 210 Bq/m³ as 610. What changes is how much exposure you avoid. Because risk rises steadily with exposure and over years, most homeowners see mitigation as a one-time cost for a permanent reduction, often to well under 100 Bq/m³.
Who pays: buyers, sellers, builders, landlords
- New homes (Tarion): Ontario’s new home warranty includes radon remediation coverage of up to $50,000 for seven years from possession, when a long-term test (at least three months) shows levels above 200 Bq/m³. Start by contacting your builder. Details.
- Real estate: radon is often handled by price negotiation or a holdback. How buyers and sellers handle it.
- Rental properties: landlords usually arrange and pay for testing and mitigation as a building improvement.
How to compare quotes
- Is the installer C-NRPP certified for mitigation? Ask for the certification number.
- Will they do a communication (pressure-field) test before sizing the system?
- Is the fan located outside living space, and where will it discharge?
- Is sealing of the sump, drains and major cracks included?
- Does the price include a manometer, labelling and post-mitigation testing?
- What’s the guarantee if the follow-up test isn’t below 200 Bq/m³?
- What are the fan warranty and workmanship warranty?
Common questions
How much does radon mitigation cost in Ontario?
Most single-family homes fall roughly between $2,000 and $3,500 for a sub-slab depressurization system. Complex homes with several foundations, crawlspaces or difficult pipe routes can cost more. A site assessment gives a fixed price.
Are there radon mitigation rebates in Ontario?
Programs come and go. New homes may be covered by Tarion’s warranty within seven years of possession. Check with your municipality and health unit for any current local incentives.
How much electricity does a radon fan use?
Typical radon fans draw roughly 20 to 90 watts while running continuously, a modest yearly cost similar to leaving one or two light bulbs on.