Radon Inspection in Ontario: What It Is, How It Differs From Testing, and What It Costs
You booked a home inspection and the inspector offered to add a “radon inspection” for a few hundred dollars. Now you’re wondering what that even is, and whether it’s different from a radon test.
Here’s the honest answer up front.
A “radon inspection” isn’t a separate, regulated service. It’s the same thing as a radon test. People just search for it in different words. This guide clears up the confusion and tells you what you’re actually paying for.
The short version:
- “Radon inspection” and “radon test” mean the same thing. There’s no separate radon inspection trade in Canada.
- A real radon measurement uses a calibrated device left in your lowest lived-in room for days or months.
- Some home inspectors add a radon measurement to a home inspection. Others don’t touch it.
- A standalone radon test at Breathe Radon Free is $99. A real estate transaction test is $399.
- You genuinely need a dedicated radon measurement when buying, selling, or checking that a mitigation system works.
- Watch out for anyone who claims to “inspect” for radon by looking around. Radon is invisible. It can only be measured.
Is a radon inspection different from a radon test?
No. They’re the same thing, described two different ways.
There’s no regulated service in Canada called a “radon inspection” that’s separate from radon testing. Radon is a gas. You can’t see it, smell it, or spot it by looking at a foundation.
The only way to know your level is to measure it. That measurement is the test.
So when someone says “radon inspection,” they almost always mean one of two things:
- Get my home checked for radon (they want a test)
- Add radon to my home inspection (they want a measurement bundled with an inspection)
Both come down to the same physics. A device sits in your home for a set time and records how much radon is present.
Why people search “radon inspection” anyway
The word “inspection” feels official. It sounds like the thing you order when buying a house.
That’s the root of it. Most people first hear “radon” during a real estate deal, right next to the home inspection. So the two words blur together.
There’s nothing wrong with using the phrase. Just know that under the hood, you’re buying a radon measurement. Anyone charging you for a “radon inspection” should be leaving a real device in your home, not walking around with a clipboard.
What a proper radon measurement actually involves
A real radon test follows Health Canada’s measurement protocol.
Here’s what a proper measurement looks like:
- A calibrated device. Either a continuous radon monitor or a lab-analyzed kit like an alpha track or charcoal canister.
- The right spot. The lowest level you actually live in, such as a finished basement bedroom or family room.
- The right height. About 80 cm to 2 m off the floor, away from exterior walls, vents, and windows.
- The right conditions. For short tests, windows and outside doors stay closed as much as normal life allows.
- Enough time. Short tests run 2 to 7 days. Long tests run 91 days or more.
The result comes back in Becquerels per cubic metre (Bq/m³). Canada’s action guideline is 200 Bq/m³.
If you want the full breakdown of kit types, placement, and what the numbers mean, we wrote a plain-English guide to radon testing in Canada.
A radon measurement is only as good as its placement. A device in the wrong room tells you about the wrong room. This is why placement rules matter more than the brand of kit.
Home inspection radon add-on vs a dedicated radon test
During a real estate deal, you’ll often see two paths. Here’s how they compare.
| Home inspector radon add-on | Dedicated radon test | |
|---|---|---|
| Who does it | Your general home inspector | A radon-focused tester |
| Device | Usually a short-term monitor | Calibrated monitor or lab kit |
| Duration | 48 hours, closed-house | 48 to 72 hrs, or longer for residential |
| Report | Part of the inspection report | Standalone written radon report |
| Typical cost | $150 to $300 add-on | $99 residential, $399 real estate |
| Best for | Quick screen during inspection | Deals, disputes, mitigation checks |
Neither path is wrong. A home inspector’s radon add-on is fine for a quick screen during a purchase.
But a dedicated test gives you a cleaner, standalone report. That matters if the reading is high and you need to negotiate or file a warranty claim.
One more thing. A general home inspector checks dozens of systems in a few hours. Radon is one line item for them. A dedicated tester does one job and follows the measurement protocol closely.
What a radon inspection costs in Ontario
Prices vary by who you hire and how fast you need the result. Here’s the honest range.
- DIY kit: $25 to $50 for a charcoal or alpha track kit, lab fee usually included.
- Home inspector add-on: $150 to $300 bundled into a real estate inspection.
- Breathe Radon Free residential test: $99 flat, written report, Health Canada protocol.
- Breathe Radon Free real estate test: $399, faster 48 to 72 hour turnaround for closing timelines.
- Breathe Radon Free long-term test: $299 for a 91-day measurement.
The $99 residential test is the one most homeowners want. It’s a proper measurement with a written report, not a mail-in slip.
The $399 real estate test exists for one reason. Deals move fast, and you need a signed report inside your inspection window.
You can see all three options on our services page. No test costs more than it should, and we’ll tell you if a $40 DIY kit is enough for your situation.
DIY radon test vs hiring a pro: when each makes sense
You don’t always need to hire someone. A DIY kit works for plenty of homeowners. Here’s the honest split.
When DIY is plenty
You own your home. You have no deadline. You’re just curious.
Buy a long-term alpha track kit for about $40. Leave it in your lowest lived-in room for 91 days. Mail it to the lab.
If the result comes back under 100 Bq/m³, you’re done for the next 5 years. The lab process is the same one a pro uses. The chemistry doesn’t care who dropped off the kit.
When to hire a pro instead
Some situations call for a certified test with a written report from the start.
- Buying a home. Your closing date is weeks away. You need a fast test and a signed report inside the inspection window.
- Selling a home. Buyers trust a professional report more than a mail-in kit slip.
- Filing a Tarion warranty claim. Tarion needs a proper measurement to trigger builder-paid mitigation.
- Checking that mitigation worked. The test after a system installs should be done by someone independent of the installer.
- You already tested high once. A second test by a different method removes doubt before you spend thousands on a fix.
If you bought a newer build, the Tarion path can cover the cost of any fix. We walk test customers through the Tarion claim process for free.
When you genuinely need a standalone radon inspection
Most of the time, a simple test is all you need. But a few moments call for a dedicated, documented radon measurement.
- A real estate transaction. Buyer or seller, a standalone report keeps radon from becoming a deal-killer.
- Post-mitigation verification. After a fan and pipe system goes in, you confirm it worked with a fresh test 30 days later.
- A high first reading. When a screening kit reads high, you confirm with a second, independent measurement.
- A dispute. If a builder or seller pushes back, a clean written report is your proof.
In each case, the value isn’t the word “inspection.” It’s the documented number and the report behind it.
Local context for Ontario homeowners
Radon levels swing a lot across Ontario. Geology and home age both play a part.
Guelph, Kitchener, and Wellington County sit on dolostone bedrock with glacial deposits on top. Homes there often read higher than the central GTA.
Toronto runs lower on average. But pre-war stone foundations in older neighbourhoods can still test high.
Newer subdivisions anywhere in Ontario can read high too. Tighter, more airtight homes trap radon. They don’t repel it.
A radon map is a hint, not a verdict. Two homes next door can read 10 times apart. The only way to know your home is to measure your home.
What to do next
If you’re mid-purchase, book a fast test now so the report lands inside your inspection window. If you own your home and have never tested, this is the season to close that gap.
Radon is the second-leading cause of lung cancer in Canada.
You can book a $99 radon test in 60 seconds. We’re an Ontario-based, owner-led testing service, based in Guelph and serving the Greater Toronto Area plus surrounding Southern Ontario.
If a $40 DIY kit is the right call for you, we’ll say so. Trust beats a quick sale every time.
Frequently asked questions
Is a radon inspection the same as a radon test?
Yes. There’s no separate radon inspection service in Canada. Radon is invisible, so it can only be measured, not spotted by looking. When people say “radon inspection,” they mean a radon test.
How much does a radon inspection cost in Ontario?
A DIY kit runs $25 to $50. A home inspector’s radon add-on runs $150 to $300. A dedicated residential test at Breathe Radon Free is $99, and a faster real estate test is $399.
Can a home inspector test for radon?
Some do, as a paid add-on to a home inspection. It’s usually a 48-hour short-term test. A dedicated radon tester gives you a standalone written report, which matters more if the reading is high.
How long does a radon inspection take?
A short-term test runs 2 to 7 days, or 48 to 72 hours for a real estate deadline. A long-term test runs 91 days or more. Longer tests give a more reliable yearly average because they smooth out seasonal swings.
Do I need a radon inspection when buying a house?
It’s smart, especially for basements and lower-level homes. Make a fast radon test a condition of your offer so a signed report lands inside your inspection window. Our buyer’s playbook has clause wording and a negotiation plan.
Get a $99 radon test booked in 60 seconds →
Authored by the Breathe Radon Free Team. Every claim is backed by a primary source. Full bibliography at /sources.
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