We had a basement bedroom window that leaked every significant rain for 3 years. Tried caulking twice. Finally called a waterproofing company and a plumber to figure it out properly.
What the inspection found:
The window well had no drain — just gravel sitting on compacted soil
The gravel had silted over and was essentially impermeable
The downspout from the north wall discharged 4 feet from the well
The ground sloped slightly toward the foundation on that side
What we fixed (in order of impact):
Regraded the soil on the north wall to slope away ($0 — did ourselves with fill from the garden)
Extended downspout 8 feet away from house ($95 in materials, DIY)
Excavated the window well, installed 8-inch perforated pipe in fresh gravel bed, tied into the weeping tile ($1,600 — plumber/excavator)
New polycarbonate well cover ($145)
Total cost: $1,840
Result:
Zero leaks through a full season including two major rainfall events. The root cause was the clogged well with no drainage — the gravel bed and drain pipe solved it.
What I’d tell anyone with a leaking basement window:
Before spending $10,000 on interior drainage, walk outside and look at your window well, your downspout discharge, and your grading. In our case, the fix was under $2,000 because the cause was entirely above grade.
This is a good write-up because it shows the diagnostic ladder that most homeowners skip — they go straight to caulking or waterproofing membrane without checking whether the drainage path itself is blocked. You had three compounding failures and you sorted all three.
A few things worth knowing for anyone dealing with a similar situation:
Window well drains need to connect somewhere real. The drain at the bottom of the well should tie into a weeping tile or daylight to a lower grade. If it just runs into gravel with no exit, you haven’t got a drain — you’ve got a bathtub. When we pull wells during exterior work, we see this constantly in homes built before the mid-80s. Original installers did the right thing for the era; drainage specs just weren’t what they are now.
Gravel doesn’t last forever as drainage media. Fines migrate in over years from surface runoff, and once the voids are plugged, the whole system performs like compacted soil. If you’re keeping a well, clean or replace the gravel every 7-10 years, or switch to a perforated drain tile wrap with washed stone.
The downspout point matters more than people realize. You identified yours was discharging 4 feet from the wall. For context, the Ontario Building Code minimum is 6 feet, and in clay-heavy soil like you find in Etobicoke and across most of the GTA, even 6 feet isn’t always enough during a hard rain event. If the grade slopes toward the house at all, that discharged water follows the slope right back to the wall.
Sounds like you’ve got it sorted now. The work your waterproofing contractor did — cleaning the drain channel and verifying the tie-in — is the unglamorous fix that actually lasts.