Ontario home illustrating water protection from roof leaks through foundation and drainage — Waterproof Ontario.

Why is my window well flooding?

Window wells flood when the drain, cover, or grade sends storm water straight at the glass.

A window well floods when rain or meltwater fills it faster than its drain can empty it, or when the well has no drain. Water then enters at the window frame. Leaves, a missing cover, a disconnected drain, and soil above the rim are the usual causes. It is often a smaller repair than full waterproofing, unless the same storm also wets the walls.

Where the water shows up

What you see	Likely cause
Water only at one window	That well’s drain, cover, or rim height
Well full of leaves	Drain blocked; cover missing or open
Soil above the rim	Grade or mulch spilling into the well
Well dry but frame wet	Flashing or frame seal, not the well drain

What to do now

Clear debris, confirm a drain opening in the bottom, and keep soil and mulch below the rim. A cover keeps out leaves; it does not fix a drain that was never connected.

When to call a contractor

Call if the well refills every storm after it is cleared, if the window frame is rotting, or if water is also entering at the floor. Ask the contractor where the well drain discharges.

Start with the provincial guide water in the basement, then the Ontario cost hub.

Local basement waterproofing guides

Do window well covers stop basement leaks?

Covers keep out rain, leaves, and some meltwater. They do not help if the drain is blocked or if groundwater fills the well from below. You still need a working drain and a rim above the grade.

Should a window well drain tie into the weeping tile?

Often yes, or to a separate line that daylights away from the foundation. A drain that ends in soil beside the wall brings the water straight back.

Resources & guides

Practical articles on moisture, foundations, and keeping water out of Ontario homes.

All guides