How to Hire a Radon Professional in Canada

If your radon test came back elevated, or you want a professional to test your home in the first place, the next step is finding the right contractor. In Canada, radon professionals are certified through the Canadian National Radon Proficiency Program (C-NRPP), which is the national standard recognized by Health Canada. Any contractor doing radon work in your home should be C-NRPP certified. That's the floor, not the ceiling.

Here's how to find one, what to ask, and what to watch out for.

What C-NRPP certification actually means

C-NRPP is Health Canada's designated certification body for radon professionals. Certified professionals have completed specific training, passed standardized exams, and maintain their credentials through ongoing professional development.

There are two separate C-NRPP certifications, and the distinction matters.

A CRT (Certified Radon Technician) is certified for measurement. They can test your home, interpret results, and provide a formal report. If you need documented evidence of your home's radon level for a real estate transaction or insurance purpose, you need someone with a CRT credential.

A CRMT (Certified Radon Mitigator Technician) is certified to design and install mitigation systems. They drill through your foundation, install the piping, and connect the fan. Some professionals hold both credentials; many hold only one.

Before you hire, confirm which certification a contractor holds and whether it matches the work you need. A CRT can test your home but can't perform certified mitigation. A CRMT installs your system but may or may not be the right person to perform your post-installation test if you want an independent result.

How to verify a contractor is actually certified

Don't take their word for it. The C-NRPP maintains a public registry at c-nrpp.ca/find-a-professional where you can search by name, company, or province and confirm their certification is current.

Any legitimate contractor will give you their C-NRPP certification number without hesitation. If someone hedges, says their certification is "in progress," or won't provide the number, walk away.

Every contractor listed on RadonFinder.ca has been matched against the C-NRPP registry before being added to the directory.

Getting multiple quotes

Get at least two quotes before committing. For a job typically running $1,500 to $3,500, the time is worth it.

When comparing, make sure you're looking at equivalent scope. If one contractor is proposing a single suction point and another is proposing two, those aren't the same job. Ask each one to explain their approach and why they're recommending it for your specific home.

The lowest quote isn't automatically the right choice. A price dramatically below market often means something is being left out, the system will be undersized, or the contractor lacks the experience to price the job correctly. Be skeptical of outliers on the low end.

What to ask before you hire

A few questions worth putting to every contractor before you sign anything:

Are they C-NRPP certified, and can they provide their certification number so you can verify it? What mitigation method are they recommending, and why does it suit your specific foundation? How did they size the fan? A contractor who can't explain their fan selection may be guessing. Is post-installation testing included in the quote, or how do they expect you to arrange it? What warranty do they offer, and is it in writing?

If a contractor can't answer these clearly and confidently, that tells you something.

What a proper quote should include

A complete quote covers the labour and materials for installation, the radon fan itself, all PVC piping and fittings, patching around penetrations, and a manometer (pressure gauge) to confirm the system is working. Post-installation testing should either be included or clearly addressed.

Things not always included: electrical work if a new circuit is needed 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.

Red flags worth knowing

A contractor who won't provide their C-NRPP number should be ruled out immediately. No certification is a dealbreaker.

Phone estimates without seeing the home are a common problem. Legitimate mitigation quotes require understanding your foundation type, basement layout, and soil conditions. A contractor who quotes a firm price over the phone without asking detailed questions is either guessing or planning to supplement the bill with change orders once they're on-site.

Pressure to sign the same day is another warning sign. Radon is a long-term health risk, not an emergency that requires a contractor in your home tomorrow. Anyone pushing for an immediate commitment before you've reviewed a written proposal deserves skepticism.

No post-installation testing is a fundamental gap. A system installed without verification isn't complete work. Ask directly whether this is included, and if a contractor can't explain how they close the loop on confirming the system is actually working, find someone else.

A conflict of interest on testing is worth considering too. If you want a professional test done, using someone separate from the contractor installing your system avoids any incentive to exaggerate pre-mitigation results.

After installation

A well-installed system runs quietly and continuously. The fan uses roughly the electricity of a light bulb. The pressure gauge on the pipe in your basement should show negative pressure, confirming the fan is drawing air from beneath your slab.

Get your first post-installation test at least 24 hours after the system starts, and ideally 30 to 90 days later for a reliable long-term reading. If levels are still elevated, your contractor should address it under their workmanship warranty.

Plan to retest every 2 to 5 years. Foundations develop new cracks, renovations happen, and soil conditions shift. Occasional retesting confirms the system is still performing.

Find a certified radon professional near you

Every contractor on RadonFinder.ca holds active C-NRPP certification verified against the public registry. Search by province or city to find professionals serving your area.

Find a certified radon professional near you

For cost information before you get quotes: How much does radon testing and mitigation cost in Canada?

For context on what your test result means: How to interpret your radon test results