How to Fix a Window That Won't Stay Closed

A window that won't stay closed is a security risk, energy waster, and noise problem. Whether it slides open on its own or the latch won't hold, here's how to fix it.

Why Won't My Window Stay Closed?

• Broken or worn latch/lock: The latch mechanism no longer holds the sash in the closed position
• Misaligned latch: The latch and keeper are no longer aligned due to frame movement
• Broken sash balance: The balance is pulling the sash upward (for lower sash) or letting it fall (for upper sash)
• Warped sash: The sash has twisted and no longer sits flat in the frame
• Worn weatherstripping: The seal has compressed so much the sash has room to move

Step 1: Check and Fix the Latch

The latch is the first thing to check. Close the window and try the latch. If it doesn't engage, check if the latch and keeper are aligned. A misaligned keeper can be repositioned by loosening its screws and shifting it to meet the latch.

Step 2: Replace a Worn Latch

If the latch is worn, bent, or broken, replace it. Window latches are inexpensive and available by window type at hardware stores. Match the finish and style to the existing hardware.

Step 3: Add a Window Lock