Top Causes of Water Damage in Canadian Homes

Water damage is one of the most common and expensive problems homeowners face in Canada, especially in Ontario where fluctuating temperatures and seasonal storms present a constant threat to homes. The impact of water damage goes far beyond wet floors and soggy drywall. It can lead to structural deterioration, electrical hazards, mould growth, and long-term health issues. At Preferred Restoration Contractors, we’ve been providing water damage restoration for over 18 years, and we understand the root causes that lead to these incidents. Educating homeowners is part of our mission to reduce risk and promote proactive protection.
One of the primary causes of water damage in Ontario homes is frozen pipes. During the winter months, the drop in temperatures causes water inside pipes to freeze and expand. When that pressure builds, the pipe can burst, flooding basements, walls, and ceilings. Often, homeowners only discover the damage when water begins to stain the ceiling or pool on the floor. Unattended properties or poorly insulated homes are especially vulnerable, making it essential to winterize plumbing and maintain proper interior heating—even when away from home.
Another major cause is leaky roofs. After a heavy rain or snowstorm, water can seep through cracked or missing shingles, faulty flashing, or clogged gutters. Water slowly infiltrates the attic and trickles down through the structure, leading to mould growth, warped ceilings, and interior damage. Many homeowners don’t realize there’s a problem until it’s already serious. Preventative maintenance like regular roof inspections and keeping gutters clear can go a long way in reducing the chances of such damage.
Basement flooding is a recurring issue in many Ontario neighborhoods. Poor drainage, foundation cracks, broken sump pumps, and high groundwater levels contribute to sudden influxes of water into the lowest part of the home. A flooded basement can damage not only the structure itself but also furniture, electronics, and family keepsakes stored in these spaces. Our team specializes in both interior and exterior waterproofing solutions, as well as sump pump installations, inspections and servicing to safeguard homes year-round.
In addition to weather-related issues, household appliances are also a common source of water damage. Washing machines, dishwashers, hot water tanks, and refrigerators with ice makers often develop slow leaks. These leaks may go undetected for weeks or months until the flooring starts to swell or mould appears on nearby walls. Regular inspections and timely maintenance are vital for avoiding these stealthy water intrusions. As part of our damage prevention program, we recommend homeowners check hoses, connectors, and seals at least twice a year.
One often-overlooked contributor to water damage is outdated or faulty plumbing. Corroded pipes, old water valves, and poor installation can cause leaks inside walls or ceilings, which quietly erode the home’s integrity. Without regular inspections or modern plumbing updates, these hidden threats can turn into major insurance claims. At Preferred Restoration Contractors, we use non-invasive leak detection tools that help us locate and address the problem(s) quickly and efficiently—often before they cause visible damage.
Lastly, extreme weather events have become more frequent across Canada, including ice storms, flash floods, and severe winds. These natural disasters can overwhelm drainage systems and force water into places it doesn’t belong. While homeowners can’t control the weather, they can prepare by ensuring sump pumps are working, window wells are sealed, and emergency backup systems are in place. If disaster does strike, you can rely on a certified water damage company like ours to respond immediately and begin the cleanup and restoration process.
At Preferred Restoration Contractors, we know the emotional and financial toll water damage can have on a family. That’s why we respond within the hour, 24/7, with IICRC-certified technicians and advanced structural drying equipment to minimize disruption and restore comfort fast. Whether it’s a flooded basement, a leaking roof, or burst pipes, our team is ready to deliver fast, professional, and compassionate support.
If you suspect a leak, see signs of water damage, or simply want peace of mind before the next storm, don’t wait. Call Ontario’s trusted water damage restoration experts today and let us help you protect your greatest investment—your home.