How Much Does Radon Testing and Mitigation Cost in Canada?

Testing costs between $30 and $300 depending on whether you go DIY or professional. If your results come back high and you need a mitigation system, most Canadian homeowners pay somewhere between $1,500 and $3,000, with the national average around $2,700. There's enough variation in both numbers that the full picture is worth understanding before you make any decisions.

Why this is harder to price than it should be

Radon costs aren't like getting a quote for a furnace or a roof repair. There's no standard job. Two houses on the same street can require completely different mitigation approaches depending on foundation type, how the house is built, and where a contractor needs to route a pipe. Add regional differences in contractor availability and local market rates, and you end up with a range that can feel frustratingly wide.

That's not a dodge. It's just the reality of how radon mitigation works. The goal here is to give you enough context that when you do get a quote, you'll know whether it makes sense.

The cost of radon testing

Before mitigation is even on the table, you need a test result. Testing is cheap, especially if you do it yourself.

DIY long-term test kits: $30 to $60

This is what Health Canada recommends for most homeowners, and it's the most reliable way to get an accurate picture of your radon levels. You place a small detector in the lowest livable area of your home, leave it for at least 90 days, then mail it to a lab. Results come back within a few weeks.

The 90-day minimum matters. Radon fluctuates day to day and season to season, so a longer test averages out those swings and gives you a number you can actually act on. Most kits cost between $30 and $60 and are available online or at hardware stores.

DIY short-term kits: $30 to $60

Short-term kits follow the same process but only need 48 to 96 hours. The cost is similar, but the tradeoff is accuracy. A two-day snapshot can miss a lot. Health Canada doesn't recommend short-term tests for making mitigation decisions, though they're sometimes used to get a rough read quickly, like during a tight real estate window.

Treat a short-term result as a starting point, not a final answer.

Professional testing: $150 to $300+

A certified radon professional places continuous electronic monitors in your home, typically for 48 to 96 hours. These log levels hourly and produce a detailed report. You're paying for their time, the equipment, and the documentation.

This makes sense for real estate transactions where the seller needs verified results quickly, rental properties where a landlord wants a professional record, or any situation where you need something more defensible than a mail-in kit. Post-mitigation testing often falls here too.

Understanding your results before you spend anything

Once your test comes back, the number is in becquerels per cubic metre (Bq/m³). Health Canada's action level is 200 Bq/m³.

If you're below 200, you don't need a mitigation system right now. There's no completely safe level of radon exposure, so if you're in the 100 to 199 range, it's reasonable to retest in a few years or take basic steps to improve ventilation. You're not in crisis, but keep an eye on it.

If you're above 200, mitigation is the right move. The higher the number, the more urgency there is. A result of 600 or 800 Bq/m³ isn't a reason to panic, but it is a reason to act sooner.

One thing worth knowing: if your number is just over 200 and came from a short-term test, a long-term follow-up is a reasonable step before committing to a mitigation system. A certified contractor can help you interpret what you're seeing.

The cost of radon mitigation in Canada

Most homeowners who need a system pay between $1,500 and $3,000. The national average is around $2,700. Some jobs come in under that, some go higher. What drives the price is usually one of a few things.

The most common system: sub-slab depressurization

Most radon mitigation in Canadian homes uses sub-slab depressurization. A contractor drills one or more holes through your concrete floor, inserts a pipe, and connects it to a fan that runs continuously. The fan creates negative pressure beneath the slab, drawing radon out from under the house and venting it outside before it can get in.

It works well, it's relatively unobtrusive, and in most homes it brings radon levels down a lot, often below 100 Bq/m³. The fan runs 24/7 and uses about as much electricity as a light bulb.

A standard single-point installation in a typical Canadian home is where the $1,500 to $2,500 range usually applies.

What pushes the cost up

Multiple suction points. Some homes, particularly those with complex foundations or multiple foundation types, need more than one pipe entry point. Each additional point adds to the labour and material cost.

Pipe routing complexity. Getting the pipe from under your slab to the exterior isn't always simple. If a contractor needs to run pipe through finished living space or work around obstructions, that takes more time.

House size and foundation type. Larger homes may need more suction to depressurize effectively. Homes with crawlspaces, block foundations, or drain tile systems may need a different approach, which affects both complexity and cost.

Other system types

Sub-slab depressurization is the standard, but it's not the only option.

Crawlspace depressurization works similarly but targets an unfinished crawlspace rather than a concrete slab. It typically involves laying a membrane across the crawlspace floor and routing a pipe through it. Costs are comparable to sub-slab work but vary based on crawlspace accessibility.

Drain tile depressurization uses the home's existing drainage system as the collection point instead of drilling new holes. Less common, but effective in the right house.

Heat recovery ventilator upgrades are sometimes recommended as a complementary measure, particularly in tighter, newer homes. An HRV improves overall air exchange and can help reduce radon levels, but it's rarely sufficient on its own above 200 Bq/m³.

What a quote should include

A proper mitigation quote should cover the installation itself, the fan, all piping and fittings, and any patching around penetrations. Most reputable contractors also include a post-installation radon test, either performed by them or with a kit left for you to complete, to verify the system is working.

Not every quote includes post-mitigation testing. Ask specifically whether it's included. If a contractor installs a system and doesn't verify the result, you have no way of knowing whether it worked. That's not acceptable at any price.

Other things that aren't always included: electrical work if a new outlet needs to be installed near the fan, drywall repair if pipe routing requires opening walls, and follow-up visits if the first installation doesn't bring levels down far enough. Ask about these upfront.

Regional cost differences

The Prairie provinces, particularly Manitoba, Saskatchewan, and Alberta, have some of the highest radon concentrations in Canada and also a more established contractor base. That competition tends to keep prices reasonable and means you're more likely to find experienced professionals.

In parts of Atlantic Canada, Northern Ontario, and some areas of BC, contractor availability is thinner. You may have fewer options to compare, and travel costs can factor into pricing. Getting multiple quotes matters more in these markets, and you may need to be more patient with scheduling.

Rebates and financial assistance

A handful of provinces have offered rebate programs to offset mitigation costs. Availability changes.

Manitoba Hydro's Power Smart program has historically offered one of the stronger rebates in the country. New Brunswick and Nova Scotia have both had programs through Efficiency NB and Efficiency Nova Scotia. Some municipalities and utility providers offer their own incentives.

Before factoring any rebate into your budget, verify directly with the program that it's still active and your project qualifies. These programs get paused and discontinued.

Red flags when getting a quote

Most radon contractors are straightforward professionals doing honest work. A few things to watch for:

No C-NRPP certification. Any contractor doing radon work in Canada should be certified. You can verify at c-nrpp.ca. If someone can't confirm they're certified, move on.

A quote that's far below everyone else's. A $700 mitigation quote in a market where everyone else is quoting $2,000 usually means something is being left out, the system will be undersized, or the contractor doesn't know what the job actually requires. Be skeptical of low outliers.

No post-installation testing. Any contractor worth hiring will either include a post-mitigation test or tell you clearly how to arrange one. A system installed without verification is a system you can't trust.

Pressure to commit quickly. Radon is a long-term risk, not an emergency. A contractor pushing hard for a same-week commitment without giving you time to compare quotes is worth being cautious about.

Find a certified radon contractor near you

If your test results are above 200 Bq/m³, or if you're still in the testing stage and want professional guidance, the next step is finding someone qualified.

RadonFinder.ca lists certified radon professionals across Canada. Search by city, province, or postal code to find contractors in your area, compare listings, and reach out directly. Every contractor in the directory carries verified certification.

Getting two or three quotes before committing is always worth the time.