How to Fix a Stuck Window That Won't Open or Close

Most stuck windows can be fixed by cleaning the tracks, lubricating moving parts, and adjusting the sash or hardware.

1. Know Your Window Enemy. Determine whether you have a double-hung, casement, sliding, or awning window. Look for obvious issues like paint buildup, warped frames, broken hardware, or debris in the tracks. Try gently pushing or pulling the window while examining what's preventing movement.
2. Sweep Away the Gunk. Use a vacuum with a brush attachment to remove dirt, leaves, and debris from all tracks and channels. Scrub the tracks with warm soapy water and an old toothbrush to remove built-up grime. For paint buildup, carefully scrape it away with a putty knife, being careful not to damage the wood or vinyl.
3. Grease the Glides. Apply a small amount of silicone spray or white lithium grease to the tracks, hinges, and any visible moving mechanisms. For double-hung windows, lubricate the pulley system if accessible. Avoid using oil-based lubricants that attract dirt. Work the window gently while applying lubricant to distribute it evenly.
4. Tighten and Align. Examine locks, handles, and cranks for damage or misalignment. Tighten any loose screws with a screwdriver. If a casement window won't close, the crank mechanism may need adjustment or the arm may be bent. For sliding windows, ensure the rollers are properly seated in their tracks.
5. Dry Out Moisture Damage. If the window frame has swollen due to moisture, use a hair dryer to gently warm and dry the area, then try opening the window. For minor warping, sand down high spots carefully with fine-grit sandpaper. More severe warping may require professional adjustment or frame replacement.
6. Confirm It Moves Freely. Open and close the window several times to ensure smooth operation. Make any final adjustments to hardware or apply additional lubricant as needed. If the window still sticks, check for any missed paint buildup or debris, and repeat cleaning steps as necessary.