Fix a window that sticks or won't open
A window that won't budge or jams halfway up is usually held by paint along the edges, dirt in the tracks, or tracks that have dried out. Forcing it is how glass cracks. Find where it's catching first. A thin putty knife slid along the painted edge breaks the paint seal without splintering the wood.
What's holding it
Windows slide in channels on each side. Over the years, dust packs into those channels, fresh paint can glue the sash to the frame, and wood windows swell a little in humid weather. Figure out which one you're dealing with before you push harder, because forcing a painted-shut window is how glass cracks.
Newer vinyl windows rarely get painted shut, but their tracks collect grit, and the springs in the frame that hold the sash up, called balances, can wear out. How the window behaves tells you which problem you have.
Why windows stick
Common in older homes with wood windows.
Grime builds up and adds friction.
Wood sashes swell in damp weather.
If it won't stay open, the balance springs or sash cords may be broken.
| What it does | Most likely | What to do |
|---|---|---|
| Won't move at all, paint line along the edge | Painted shut | Cut the paint line, then tap the frame with a wood block. |
| Moves, but drags and squeaks | Dirty or dry tracks | Vacuum, wipe and lubricate with dry silicone. |
| Sticks only in humid summer weather | Wood swelling | Lubricate now. Seal bare wood edges once it's dry. |
| Opens, but won't stay up or slams down | Broken balance or sash cord | Replace the balance, or call a window repair pro. |
| Sliding window drags along the bottom | Dirty track or worn rollers | Clean the track. Replace the rollers if it still drags. |
| Crank window is hard to turn | Dry hinges or a worn crank | Clean and lubricate the hinge arms. Replace the crank if it slips. |
Free it up
- Look for a paint sealFirst make sure the sash lock is fully open. Then check where the sash meets the frame. A continuous painted line means it's painted shut.
- Cut the paint lineRun a utility knife or window zipper along every painted seam, inside and out, without prying.
- Clean the tracksVacuum loose dirt from the channels, then wipe them clean with a damp rag.
- Lubricate the channelsSpray dry silicone into the tracks, or rub a bar of wax along them. Avoid oily sprays, which collect dust.
- Work it gentlyPush the sash up and down in small movements, a little farther each time, until it moves freely.
Watch it done
- The sash moves up and down freely
- No painted seams left holding the sash
- The tracks are clean and lubricated
Opens but won't stay up? The balance mechanism has probably failed.
If it moves but still isn't right
If the window opens but won't stay up, the balance mechanism has failed. Replacement balances are available for most vinyl windows by model number.
If it sticks only in humid weather, seal the bare wood edges with paint or sealer once it's dry to reduce swelling.
Sliding windows ride on small rollers under the sash. If the track is clean and it still grinds, lift the sash out and check the rollers. Replacements are inexpensive for most brands.
What a pro typically charges (a rough estimate; prices vary by area): A handyman typically charges $100–$250 to free and service a sticking window.
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