Water finds the path of least resistance. A tiny, invisible gap under a sill can pour a bathtub of water into your wall over a single winter. Act now, and you’ll sleep dry. Bottom line: Damp under the window sill is rarely a disaster. 80% of cases are fixed with a paperclip (weep holes), a tube of silicone (exterior seal), or a dehumidifier (condensation). Tackle it this weekend before it becomes next year’s mold problem.

You’ve noticed it: a musty smell, a darkening patch of plaster, or perhaps bubbling paint right beneath your window. That “damp under the window sill” isn't just an eyesore—it’s a warning. Left unchecked, it leads to peeling wallpaper, black mold, and even rotting window frames.