Best Radon Test Kits in Canada (2026)

A mail-in radon test kit costs $30 to $60 in Canada, sits in your basement for three months, and comes back with a single lab-analysed number: your long-term average radon level. That number is exactly what Health Canada's 200 Bq/m³ guideline refers to, which makes a kit the cheapest correct way to find out whether your home has a radon problem.

If you have never tested, start here rather than with a $200 electronic monitor. The kit answers the question you actually have.

Why a kit before a monitor

Electronic monitors are more fun. They show you numbers today, graph them in an app and let you watch levels move. They are also five to ten times the price, and for a first test they answer a question you did not ask.

The question is: is my long-term average above 200 Bq/m³?

A mail-in alpha track kit answers that directly. It sits still for the full test period, absorbs whatever radon is actually present, and gets read by a laboratory. There is no screen to over-interpret and no temptation to draw conclusions from a quiet Tuesday.

A monitor makes sense when you want to see how levels change with the seasons, test several rooms, or confirm a mitigation system is doing its job. Our DIY testing versus hiring a professional guide walks through which situation you are in.

The two kinds of kit

Alpha track (long-term)

A small plastic detector holding a piece of film. Alpha particles from radon decay leave microscopic tracks in the film, and the lab counts them. Test period is typically 91 days to a year.

This is the type you want. Long-term alpha track testing is what Health Canada guidance is built around, because it averages out the enormous day-to-day swings in household radon.

Charcoal (short-term)

Absorbs radon over two to seven days, then goes to a lab. Cheap and fast.

Useful in one situation: a real estate transaction where nobody has three months. Otherwise a short-term result is close to meaningless on its own, because radon on any given week can be far above or far below your true average. If you use one and it comes back high, follow it with a long-term test rather than calling a mitigation contractor immediately.

What to look for when buying

Lab analysis must be included in the price. Most Canadian kits include it. Some cheaper imports charge separately and the postage back to a US lab can cost more than the kit.

Check the test period. Anything described as long-term should run at least 91 days. Kits sold as "3 to 12 months" give you flexibility to leave it longer.

Make sure the lab reports in Bq/m³. Canadian guidance uses becquerels per cubic metre. American kits often report picocuries per litre (pCi/L). The conversion is straightforward, 1 pCi/L is about 37 Bq/m³, but it is one more chance to misread your own result.

Buy one per level you care about. Testing the basement tells you about the basement. If your family sleeps on the ground floor, that is worth its own kit.

A widely available option in Canada

The First Alert RD1 is the mail-in kit most commonly stocked by Canadian retailers, includes lab analysis, and is inexpensive enough to buy two.

Check the First Alert RD1 price on Amazon.ca

Take Action on Radon, a national public awareness programme, also maintains a list of Canadian retailers selling long-term kits, which is worth checking for regional options and occasional subsidised pricing.

How to place it so the result means something

This is where most home tests go wrong, and a badly placed kit produces a confidently wrong number.

• Test the lowest lived-in level of the house. An unfinished crawlspace nobody enters is not it. A finished basement family room is.
• Place it in a room occupied at least four hours a day.
• Roughly breathing height, so around 1 to 2 metres, not on the floor.
• At least 50 cm from exterior walls and well away from windows, doors, vents, fans and heat sources.
• Not in a kitchen, bathroom or laundry room, where humidity and ventilation distort readings.
• Leave it alone. Do not move it, do not air the room out specially, do not change your habits. You are measuring the house you actually live in.

Test during the heating season if you can. Windows shut and heating on is when indoor radon runs highest, so a winter test gives you the more honest picture. A summer-only test can understate your real exposure.

When your result comes back

Health Canada's guideline is 200 Bq/m³ as a long-term average.

• Under 200: no action required. Radon is never risk-free, but you are within guidance.
• 200 to 600: mitigation recommended, and you have time to plan it properly.
• Over 600: act sooner rather than later.

Radon mitigation in a typical Canadian home is a well-understood job, usually a sub-slab depressurisation system, and our guide to interpreting your radon test results covers what each range means in more detail.

If you need work done, use a C-NRPP certified professional. Certification is the floor, not the ceiling, and our guide to hiring a radon professional covers what else to ask.

If you would rather have a monitor

Some people want the ongoing number, and that is a reasonable preference. Six consumer electronic monitors have been through independent Canadian performance testing, and all six passed. The cheapest tested option is around $180.

The full comparison, including the independent lab conditions and which device suits which situation, is in Best Radon Detectors in Canada 2026. Kits and monitors sit side by side on our DIY testing page if you want to compare prices directly.

Whichever route you take, the important thing is to test. Radon is the second leading cause of lung cancer in Canada and you cannot see, smell or taste it, which is covered in radon health risks.