Do egress windows need drainage in Metro Vancouver's rainy climate?

Absolutely — drainage for egress window wells is critical in Metro Vancouver and should be treated as the single most important component of the installation after the structural header. With over 1,200 millimetres of annual rainfall and some North Shore areas exceeding 2,000 millimetres, an egress window well without proper drainage will fill with water during the wet season and flood your finished basement. This is not a theoretical risk — it happens regularly to homeowners who install egress windows without adequate drainage.

Metro Vancouver's rainfall pattern makes window well drainage fundamentally different from what might be acceptable in drier Canadian cities. Approximately 70% of annual precipitation falls between October and March, often in sustained multi-day events rather than brief downpours. During atmospheric river events — which are increasingly common — Metro Vancouver can receive 50 to 100 millimetres of rain in 24 hours. A standard egress window well measuring 1,200 millimetres wide by 900 millimetres deep collects a surprising volume of water during these events. Without drainage, water rises in the well until it reaches the window sill, then enters your basement through the window frame seals, which are not designed to resist standing water pressure.

A properly drained egress window well in Metro Vancouver should include three layers of protection. First, a gravel base of 150 to 200 millimetres of 19mm washed rock at the bottom of the well, sitting on filter fabric to prevent fine soil from migrating up and clogging the drainage. Second, a direct connection to the perimeter weeping tile system — either a vertical gravel column extending down to the footing level or a dedicated 4-inch PVC pipe running from the well bottom to the weeping tile. Third, proper surface grading around the well so that soil slopes away and surface runoff does not pour into the well.

The weeping tile connection is where many installations fall short. Some contractors simply place gravel at the bottom of the well and call it done — in drier climates this might suffice, but in Metro Vancouver the gravel alone cannot absorb or dissipate the volume of water that enters the well during the wet season. The water must have somewhere to go, and that means a clear path to either the weeping tile system and eventually a sump pump, or to a storm drain connection if your municipality permits it. If your home's weeping tile is original clay tile from the 1950s or 1960s — common in older homes across Burnaby, North Vancouver, and New Westminster — it may be partially collapsed or clogged, which means the window well drainage has nowhere to discharge. In this case, weeping tile replacement ($90 to $180 per linear foot for exterior or $50 to $100 per linear foot for interior) should be addressed during the egress window project.

Window Well Covers

A clear polycarbonate window well cover is strongly recommended in Metro Vancouver. These dome or flat covers sit over the window well and shed the majority of direct rainfall away from the well while still allowing natural light into the basement and permitting the window to be opened for emergency egress. Covers cost $100 to $400 depending on size and style, and they dramatically reduce the volume of water entering the well. They are not a substitute for proper drainage — they supplement it. Even with a cover, wind-driven rain, snow melt, and surface runoff can enter the well, so the gravel and weeping tile connection remain essential.

Budget approximately $800 to $2,000 for the drainage component of an egress window installation in Metro Vancouver, depending on soil conditions, depth to existing weeping tile, and whether the weeping tile system needs repair. This is included within the typical total egress window installation cost of $3,000 to $8,000 per window. Cutting costs on drainage is the worst place to save money on this project — the cost of water damage to a finished basement far exceeds the cost of proper drainage installation.

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