Yes. A newer home in Woodbridge, Maple or Thornhill still needs a radon test, because radon comes from the soil and rock under the house, not from how old the house is. The only way to know your level is a long-term test of at least three months, ideally in the heating season, with the detector analysed by an accredited lab and the result compared with Health Canada’s guideline of 200 Bq/m³. At Golden Home Inspections we test for radon as part of our home hazard testing, and your inspector is Yama Nehan, a Certified and Registered Home Inspector with about 15 years of home inspection experience. Call 647-704-7100 to book radon testing in Vaughan.
Key takeaways
- Radon is a naturally occurring, colourless and odourless gas from the breakdown of uranium in soil and rock. Home age, builder and neighbourhood don’t predict your level.
- Health Canada recommends a long-term test of at least 3 months, ideally between fall and spring.
- Place the detector in the lowest level where someone spends time, such as a finished basement, basement bedroom or basement apartment.
- Health Canada’s guideline is 200 Bq/m³. Above it, the higher the result, the sooner Health Canada recommends lowering it.
- Retest after mitigation and after renovations that change how you use the basement.
Do newer Vaughan homes really need radon testing?
They do. Much of Vaughan’s housing is newer, from the subdivisions of Maple and Woodbridge to the townhomes around Vellore and Kleinburg, and many owners assume a modern foundation keeps radon out. Radon enters through any opening where the house meets the ground: small cracks in the slab, gaps around pipes, sump pits, floor drains and the joint between floor and wall. A tight, well-insulated new home can also hold onto indoor air longer in winter. So a new build can test higher than an older home nearby, and the reverse is just as common. Health Canada advises testing every home, whatever its age.
Radon in newer homes: myths vs facts
| What people often assume | What’s actually true |
|---|---|
| “My house is only a few years old, so radon isn’t an issue.” | Radon comes from the ground. Age doesn’t predict the result, so new homes need testing too. |
| “My neighbour tested low, so I’m fine.” | Soil, foundation details and airflow differ house to house. Two homes on the same Maple street can test very differently. |
| “A quick test during the home inspection will tell me.” | A home inspection lasts a few hours. Health Canada recommends at least 3 months to get a meaningful average. |
| “We don’t use the basement much, so it doesn’t matter.” | Test where people spend time. If the basement is finished, rented or becoming a bedroom, that’s where the detector goes. |
| “Sealing cracks will fix a high reading.” | Sealing helps, but on its own it usually isn’t enough. Sub-slab depressurization is the most common fix. |
How does our radon testing work in a Vaughan home?
We start by finding the right room. In most Woodbridge, Maple and Thornhill houses that’s the finished basement family room or a basement bedroom; in a house with a basement apartment, it’s inside the unit. The long-term detector goes at about breathing height, away from heating vents, windows, exterior walls, kitchens, bathrooms and laundry rooms. You live normally for at least three months, the detector is then sealed and analysed by an accredited lab, and we explain the result in plain language. Our home hazard testing page for Toronto and the GTA covers radon alongside asbestos, vermiculite and mould testing.
What does your radon result mean?
Your long-term result is compared with Health Canada’s guideline of 200 Bq/m³ (becquerels per cubic metre). Health Canada recommends acting faster as levels rise:
| Long-term result | What Health Canada recommends |
|---|---|
| At or below 200 Bq/m³ | No action required. Health Canada encourages keeping levels as low as reasonably achievable, and retesting after major renovations. |
| Above 200 up to 600 Bq/m³ | Take steps to reduce radon within 2 years. |
| Above 600 Bq/m³ | Take steps to reduce radon within 1 year. |
The details are in Health Canada’s radon guideline and its guide to radon measurements in homes.
What should you do if a Vaughan home tests above 200 Bq/m³?
Plan to have the level lowered by a qualified radon mitigation professional. The most common method is sub-slab depressurization: a pipe and fan draw soil gas from under the basement floor and vent it outside. Sealing the sump pit, floor drains and visible cracks usually forms part of the job. Once the work is done, run another long-term test to confirm the level has come down, and keep both lab reports with your home records. If you’re selling later, those records answer a buyer’s radon question quickly.
Radon testing checklist for Vaughan homeowners and buyers
- ☐ Book the test for the heating season, roughly October to April.
- ☐ Choose the lowest room where someone regularly spends time.
- ☐ Test each separate lived-in basement unit, not just the main house.
- ☐ Keep the detector away from vents, windows, exterior walls and wet rooms.
- ☐ Leave it in place for at least 3 months and note the start date.
- ☐ If you’re buying, ask the seller whether a long-term test was done and for the lab report.
- ☐ Retest after finishing a basement, adding a unit or any mitigation work.
A situation we often see in Vaughan
A family buys a newer detached home in Maple or Woodbridge with a finished basement and plans to turn it into a nanny suite or a bedroom for an older child. Because the house is only a few years old, radon never comes up. The sensible step is simple: book the home inspection as usual before closing, then place a long-term radon detector in that basement room over the first winter. It’s a low-effort way to know the number before someone starts sleeping down there.
Frequently asked questions
Is radon testing required when buying a home in Vaughan?
It isn’t part of a standard home inspection, which is a visual inspection lasting a few hours. Many buyers book a long-term radon test once they move in, or ask the seller for an existing result.
How long does a radon test take?
Health Canada recommends at least 3 months, ideally during fall and winter, followed by lab analysis of the detector.
Do townhouses and semis in Vaughan need separate tests?
Yes. Each home sits on its own piece of ground and has its own openings and airflow, so a shared wall doesn’t mean a shared result.
What affects the cost of radon testing?
Mainly the number of detectors (for example, a house with a separate basement apartment may need more than one) and whether you combine radon with other hazard testing or a home inspection. The final price depends on the home, so call us for a quote.
Which areas near Vaughan do you serve?
Woodbridge, Maple, Thornhill, Kleinburg and Concord, plus Toronto, Richmond Hill, Markham, Brampton, Mississauga and other GTA cities. See our Vaughan, Woodbridge, Maple and Thornhill home inspector page for inspections in the area, and our step-by-step guide to radon testing in Toronto for more on how long-term tests work.
Want to know your Vaughan home’s radon level? Call 647-704-7100 or email contact@goldenhomeinspections.ca to book radon testing with Golden Home Inspections, based in Toronto, Ontario.
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