…then you may have foundation settlement, a failing lintel, or excessive roof load. In this case, the window is not the problem—it’s just the messenger. You need a structural engineer, not a handyman.

In this post, we’ll help you identify what kind of crack you’re dealing with, what caused it, and exactly how to fix it.

Prime the patched area to seal it, then paint over it with your matching wall color.

Cracks around window sills can manifest in different ways:

Apply your joint compound or spackle over the crack (and tape). Use your putty knife to press the compound firmly into the void. "Feather" the edges by pressing harder on the sides of your stroke so the repair blends into the existing wall. Let it dry completely.

A simple and effective system for repairing cracks around window sills, preventing water intrusion and air leaks.

In short: But most of the time, it’s just your house breathing.