Do Window Wells Leak in Winter? Snow, Ice, and Cover Fixes in Ontario

When December snow piles up across Southwestern Ontario, window wells can turn from a safety feature into a source of basement leaks. If you’ve noticed damp drywall around a below-grade window in London, Kitchener, Waterloo, or Cambridge, you’re not alone. Freeze–thaw cycles, ice, and melting snow can overwhelm poorly drained wells and send water straight to your foundation. Here’s what to watch for—and how DryBasements.com Ltd can help keep your basement dry all winter.

Why winter makes window wells leak

Ontario winters bring repeated freezing and sudden thaws. Snow that collects in a window well can freeze into a solid “ice cap,” blocking the small drain at the bottom of the well. When a mid-winter warmup hits, meltwater has nowhere to go and follows the path of least resistance—through window seams, masonry joints, or foundation cracks. Add clay-heavy soils common around London, Strathroy, and Exeter that hold water, plus clogged fall leaves in the well, and the risk rises. If your weeping tile is silted or disconnected, the window well drain can back up like a plugged sink.

Signs your window well is letting winter in

• Moisture on the interior window frame or sill
• Damp carpet or drywall below a basement window
• Efflorescence (white mineral staining) on the concrete around the well
• Musty odours or frost forming on the inside of the glass

Quick prevention checklist before the next snowfall

• Brush snow away from window wells after each storm; don’t let drifts bury the well.
• Clear leaves and ice from grates; make sure the well’s drain is visible.
• Test the well drain with a small jug of warm water—if it pools, call for service.
• Use a rigid, properly fitted window well cover to keep out snow and debris.
• Extend downspouts at least 2 metres (6–10 ft) away from the foundation.
• Keep sump pump discharge lines ice-free and routed well away from wells.
• Inside, store items off the floor near basement windows and check after thaws.
• Test your sump pump and backup power before holiday travel.

People Also Ask: Should you cover window wells in winter?

Yes—when installed correctly. A sturdy, transparent, properly sized cover helps keep snow, ice, and debris out, reducing the chance of a blocked drain and winter leaks. Look for covers that fit snugly, shed snow, and allow light in. Avoid airtight sealing; a bit of ventilation helps manage condensation. If the window is an egress window, ensure the cover is code-appropriate and can be opened from the inside. After heavy snow or a thaw, brush off the cover and confirm the well and drain are clear.

Long-term fixes we recommend in London, Kitchener–Waterloo, and nearby

• New window wells sized correctly for the window, set at grade with clean drainage stone
• Proper well drains tied to functioning weeping tile or an interior drainage system
• Exterior crack repair and crack stitching to stop seepage at the foundation
• Weeping tile replacement via exterior excavation if the line is collapsed or clogged
• Interior drainage and sump pumps with sealed lids and battery backup for winter storms
• Downspout re-routing and grading improvements to move water away from wells
• Indoor air quality solutions to address lingering moisture and musty odours

Holiday-season tip

Before heading out for a December getaway, do a 10-minute walkaround. Clear wells, verify downspout extensions, and test your sump pump. Consider a Wi‑Fi sump alarm to alert you if a power outage or freeze-up happens while you’re away. A quick check now can prevent a soggy surprise before New Year’s.

Why choose DryBasements.com Ltd

Since 1990, our team has protected basements from winter leaks with proven window well drainage, sump pump upgrades, and foundation repairs tailored to Ontario’s climate. We serve homeowners in London, Kitchener, Cambridge, Waterloo, Brantford, Woodstock, St. Thomas, Stratford, Strathroy, Tillsonburg, Simcoe, Ingersoll, St. Marys, Aylmer, Exeter, Mitchell, Delhi, New Hamburg, Seaforth, and Lucan.

Get help before the next thaw

If your window well is icing over or pooling during warm spells, book a free, no-obligation assessment. Call DryBasements.com Ltd or request a visit at drybasements.com. We’ll diagnose the cause and recommend the right fix—so your basement stays a DryBasement all winter long.