DIY Radon Testing vs. Hiring a Professional: Which Is Right for You?

For most homeowners doing a routine check, a DIY long-term test kit is the right call. It costs $30–$60, produces reliable results, and is exactly what Health Canada recommends. Professional testing makes sense in specific situations, mainly real estate transactions and post-mitigation verification, where speed, documentation, or a certified result is what you actually need.

DIY radon testing

How it works

You buy a test kit, typically a small alphatrack or electret detector, place it in the lowest livable area of your home, and leave it alone. Then you mail it to the lab included in the kit. Results come back by email or mail within a few weeks.

Long-term kits (90+ days): Health Canada recommends these for mitigation decisions. They average out day-to-day and seasonal fluctuations, giving you a reliable picture of your actual exposure. Best run during heating season (October through April), when your home is sealed up and radon concentrations are highest.

Short-term kits (48–96 hours): Faster, less accurate. Useful for a rough initial read when you're in a hurry. If a short-term result puts you near the 200 Bq/m³ threshold, do a long-term follow-up before spending money on mitigation.

Cost

$30–$60 for most kits in Canada. Available online through the Lung Association and various distributors, and at some hardware stores.

Pros and cons

Good: inexpensive, easy to use, no scheduling, long-term tests are the gold standard for accuracy, no need to be home during the test.

Drawbacks: 90+ days to get a reliable result, no certified documentation, and no professional interpretation included with your number.

Professional radon testing

How it works

A certified radon measurement professional places continuous electronic monitors in your home. These log radon levels hourly and produce a detailed report after 48–96 hours. The professional retrieves the monitors and provides you with a formal report.

Cost

$150–$300 in most Canadian markets, more in remote or underserved areas.

Pros and cons

Good: fast results, certified report suitable for real estate, professional advice on test placement and interpretation, tamper-evident equipment.

Drawbacks: more expensive, requires scheduling a visit, and the 48–96 hour test window is still less accurate than a 90-day long-term test (though the quality of monitoring equipment helps close that gap).

When to go DIY

You want to know your baseline radon level. A long-term DIY kit is the right tool. Inexpensive, accurate, and exactly what Health Canada recommends.

You're in a lower-risk area and just want peace of mind. A long-term kit is all you need.

You've had a mitigation system installed and want to confirm it's working. You can use a DIY kit for post-mitigation testing. Slower than a professional test, but reliable.

You're not under a deadline. If there's no time pressure, a long-term DIY kit gives you better data.

When to hire a professional

You're in a real estate transaction. Tight closing timelines don't allow for a 90-day test. A professional with continuous monitors can produce results in 48–96 hours, and the certified report satisfies most real estate conditions. If you're buying, ask for this as part of your offer conditions. If you're selling, consider getting a professional test before listing.

You need certified documentation. Landlords who want a paper trail, or sellers who want to demonstrate professional verification, need a certified report. A mail-in kit result is harder to use in that context.

You want immediate results. If a short-term test alarmed you and you want a faster, more authoritative answer before committing to mitigation, a professional test makes sense.

You want advice with your result. A certified measurement professional can advise on test placement and walk you through what the numbers mean. A mail-in kit just sends you a number.

A note on post-mitigation testing

After a mitigation system is installed, you need to verify it's working. Two approaches:

Professional post-mitigation test: Monitors run for 48–96 hours after the system has been running for at least 24 hours. Faster option, produces a certified result.

DIY long-term kit: Run it for 90+ days after installation. Slower, but gives you the most accurate long-term picture of what the system is actually doing.

Many homeowners do both: a professional short-term test soon after installation, and a DIY long-term test a few months later for a reliable annual baseline.

Where to get test kits in Canada

DIY kits are available from:

• The Canadian Cancer Society
• The Lung Association
• Amazon and other online retailers
• Some hardware stores (Home Depot, Canadian Tire)

Make sure the kit is designed for Canadian standards (results in Bq/m³, lab accredited by CARST or equivalent).

To find a certified measurement professional, search by province or city on RadonFinder.ca. Professionals who offer both testing and mitigation can handle either step.