Why Your Neighbourhood’s Recent Construction is Spiking Radon In Your Older Home
Posted in Radon Testing, on May 11, 2026
Old homes come with plenty of charm but often need slightly different upkeep than newer builds. A common issue SafeAir encounters during home air quality testing is spiking radon levels in homes with recent neighbourhood construction. This is a surprisingly common experience because new builds, changes to soil and geology, and other factors can shift radon pathways. We offer radon testing as a stand-alone service or as part of general environmental assessments in Toronto to help you determine if your home’s indoor air environment has changed.
Soil Disturbances Change Radon Pathways
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The most common mechanism for spikes on radon testing is the changes that happen to the ground and soil when there’s nearby construction. Excavation and heavy machinery can disrupt compacted soil layers and change the way that water and gases move through it. Radon gas is dangerous because it can concentrate in your home’s basement or lower levels, where it enters through cracks and gaps in the foundation. Older homes with less modern foundations or problems with sealing or piping are especially vulnerable to these shifts.
Pressure Imbalances From Excavation and New Builds
Air pressure is a critical element in preventing radon gas exposure. Basements create pockets of negative space in the earth that can draw radon gas towards them. When large-scale digging or excavation works happen nearby, the earth’s air pressure balance can shift, drawing more radon towards your property. Of course, this means radon can be drawn away, too, but without any scent or visible evidence you’re being affected, radon testing is the only way to know for sure what your risk is.
Older Homes Lack Modern Sealing and Barriers
Radon gas has been around since the earth was formed, but it’s only in the last 25 or so years that we’ve realized how it affects human health, and how our building habits can cause it to concentrate indoors. Many older homes were built before radon-resistant construction standards existed, and regular wear-and-tear from age and weather can also put you at risk. Homes with foundation cracks, porous concrete, and sump pump pits generally test higher during environmental assessments in Toronto, because they create easy access points.
Professional Radon Testing and Mitigation
As we’ve mentioned, radon gas leaves no trace. It has no odour, and it causes no short-term symptoms, making it impossible to detect with the senses. Over time, radon gas causes cellular and physical changes to your respiratory system that make it the leading cause of lung cancer in non-smokers. The only way to know if you’re affected is to have professional radon testing at home.
At SafeAir, our radon testing process is straightforward and easy. We install an unobtrusive device in your basement, and let it passively sample your air for 3-6 months. After this period, it’s sent to a third-party lab for assessment, and we prepare an easy-to-understand report outlining our findings.
If your home’s radon levels exceed Health Canada guidelines, we’ll make suggestions for mitigation and reduction strategies to reduce your risk. Home air quality testing is all about creating a safe, healthy living environment through fresh and pollution-free air. If there’s local construction or you have questions about changes to your environment and how they might affect your radon risk, contact SafeAir to book your radon test in Toronto today.