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

The bottom line up front

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

DIY radon testing

How it works

You buy a test kit (typically a small alphatrack or electret detector), place it in the lowest liveable area of your home, and leave it for a set period. 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): These are what Health Canada recommends for making decisions about mitigation. They average out the day-to-day and seasonal fluctuations in radon levels, giving you a more reliable picture of your actual exposure. The best time to run a long-term test is during heating season (October through April), when your home is sealed up and radon concentrations are highest.

Short-term kits (48–96 hours): Faster, but less accurate. Useful for a rough initial read, but not reliable enough on their own to make mitigation decisions. If a short-term result is your only data point and you're near the 200 Bq/m³ threshold, follow up with a long-term test before spending money on mitigation.

Cost

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

Pros

• Inexpensive
• Easy to use — no scheduling required
• Long-term tests are the gold standard for accuracy
• No need to be home during the test period

Cons

• Takes 90+ days for a reliable result (long-term kit)
• Results aren't "certified" in the way a professional report is
• Requires you to correctly identify and use the lowest liveable space
• No professional interpretation included

Professional radon testing

How it works

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

Cost

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

Pros

• Faster results — 48–96 hours vs. 90+ days
• Produces a certified, documented report suitable for real estate transactions
• Professional can advise on test placement and interpretation
• Electronic monitors are accurate and tamper-evident
• Post-mitigation testing by a professional provides verified documentation

Cons

• Significantly more expensive than a DIY kit
• Requires scheduling and a professional visit
• Short test window (48–96 hours) still produces less accurate results than a 90-day long-term test, though this is mitigated by the quality of the monitoring equipment

When to choose DIY

You want to know your baseline radon level. A long-term DIY kit is the right tool. It's inexpensive, accurate, and gives you the kind of data Health Canada recommends for making informed decisions.

You're in a low-to-moderate 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 — place it in the lowest liveable area and run it for 90+ days. This is the slow version, but it's reliable.

You're not under time pressure. If there's no deadline driving your decision, a long-term DIY kit will give you the best data.

When to hire a professional

You're in a real estate transaction. Short closing timelines don't allow for a 90-day test. A professional using continuous monitors can produce a result in 48–96 hours, and the certified report satisfies most real estate conditions. If you're a buyer, request this as part of your conditions. If you're a seller, consider getting a professional test before listing so you're prepared.

You want certified documentation. If you're a landlord, you want a paper trail. If you're selling a home with elevated results and want to demonstrate professional verification, a certified report is more defensible than a mail-in kit.

You want immediate results. If you received a short-term test result that alarmed you and you want a faster, more authoritative answer before committing to mitigation, a professional test is the right next step.

You want advice along with results. A certified measurement professional can advise you on test placement, interpret your results, and point you toward the right next steps. 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. There are two approaches:

Professional post-mitigation test: Your installer or a separate measurement professional places monitors for 48–96 hours after the system has been running for at least 24 hours. This is the faster option and produces a certified result.

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

Many homeowners do both: a professional short-term test shortly after installation for immediate confirmation, and a DIY long-term test a few months later for a reliable 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 and lab accredited by CARST or equivalent).

To find a certified measurement professional, use RadonFinder.ca to search by province or city. Look for professionals who offer both testing and mitigation — they can handle either step.