It reaches the closed position, then drops back down
You can lift or lower the sash, but when you let go it drifts open again.
Start here: Check for a failed window balance or a sash that is not seated correctly in both side tracks.
Window troubleshooting
Window Won't Stay Closed
Direct answer: If a window won't stay closed, the usual cause is a sash that is out of its track, a lock that is not pulling the sash tight, or a failed window balance letting the sash drift back down or pop up.
Most likely: Start by figuring out whether the sash is physically binding, sitting crooked, or moving freely but not staying put. That split tells you a lot faster than forcing the lock.
Most windows that refuse to stay closed are dealing with a simple mechanical problem, not a whole-window failure. Reality check: a window that worked fine last season can start acting up from dirt in the track, a tilted sash, or one worn balance. Common wrong move: people lean on the sash and snap the lock trying to make it hold. Check alignment and movement first, then decide whether you need a latch, a balance, or a pro for frame movement.
Don’t start with: Don't start with caulk, shims, or a replacement window. And don't crank the lock to force a misaligned sash shut.
If the sash looks crookedCheck whether it has jumped out of the side track or tilted out of its shoes before touching the lock.
If it closes but slides back openFocus on the window lock and window balance, not weatherstripping.
Last reviewed: 2026-04-05
What kind of 'won't stay closed' problem do you have?
It looks crooked and won't seat at the top or bottom
One corner hits first, the reveal is uneven, or the sash rubs hard on one side.
Start here: Look for a tilted sash, debris in the track, or frame movement that has pulled the opening out of square.
It closes, but the lock will not catch or hold
The meeting rails touch but the latch misses, or the lock feels like it is pulling against resistance.
Start here: Inspect sash alignment first, then check whether the window lock or keeper is loose, bent, or broken.
It is hard to close at all
The sash binds, scrapes, or needs two hands and body weight to move.
Start here: Clean the tracks and look for paint, swollen wood, bent vinyl, or a sash that has come partly out of its guide.
Most likely causes
1. Sash out of track or tilted out of position
This is common on double-hung and tilt windows after cleaning, rough operation, or one side being raised first. The sash looks cocked and the lock usually stops lining up.
Quick check: Open the window a few inches and compare the gap on both sides. If one side sits higher or the sash can rock, it is likely not seated correctly.
2. Failed window balance
When a balance wears out or disconnects, the sash will not stay where you put it. It may slide down, pop up, or feel much heavier on one side.
Quick check: Move the sash halfway and let go carefully. If it drops, rises, or one side lags behind the other, suspect the window balance.
3. Loose or damaged window lock and keeper
If the sash reaches closed position but will not stay latched, the lock may be stripped, bent, or no longer aligned with the keeper.
Quick check: With the sash fully seated, watch the lock tongue and keeper together. If they miss each other or the lock spins without pulling tight, the hardware is the problem.
4. Dirty tracks, paint buildup, or frame movement
Binding from grime or old paint is common. If the frame itself has shifted, the sash may bind at one corner and never sit square enough to latch.
Quick check: Look for rub marks, packed dirt, paint ridges, or a widening gap at one corner. If the frame looks racked, this is beyond a simple hardware fix.
Step-by-step fix
Step 1: Figure out whether the sash is binding or just not staying put
You want to separate a movement problem from a holding problem before you touch hardware or buy parts.
- Unlock the window and move the sash slowly through its travel.
- Notice whether it scrapes, jams, or goes up and down fairly smoothly.
- When the sash reaches the closed position, let go carefully and see whether it stays there, drops, or springs back.
- Look at the side gaps and the meeting rails to see whether the sash sits level.
Next move: If the sash moves smoothly and sits level, skip ahead to the lock check because the main issue is probably latching or balance tension. If it binds, twists, or one corner leads the other, stay with alignment and track checks first.
What to conclude: A smooth-moving sash that will not stay closed usually points to the window balance or lock. A crooked or dragging sash usually points to track, tilt, or frame issues.
Stop if:
- The sash feels like it may fall out of the frame.
- A side track, pivot shoe, or sash corner looks cracked or broken.
- The frame is visibly loose in the wall or trim is separating.
Step 2: Check for a tilted sash or something blocking the tracks
A sash that is even slightly out of position can make the lock miss and can mimic a bad balance.
- Open the window a few inches and inspect both side tracks from top to bottom.
- Remove loose dirt, insect debris, and paint flakes with a dry cloth or vacuum brush attachment.
- On tilt-in styles, make sure both top corners are fully snapped back into operating position and the sash is seated evenly in both side channels.
- Close the sash again without forcing it and watch whether both bottom corners reach the sill at the same time.
Next move: If the sash straightens up and now closes normally, the problem was track debris or a sash that was not seated correctly. If one side still rides higher, drops faster, or refuses to seat, move on to the balance and hardware checks.
What to conclude: Cleaning and reseating fix a lot of window complaints. If the sash still sits crooked after that, one side is usually no longer being supported correctly.
Step 3: Test the window balance by feel and by behavior
A failed window balance is the most common reason a movable sash will not stay where you leave it.
- Raise the sash about halfway and let go carefully while keeping your hands close.
- Repeat near the top and near the bottom to see whether the sash drifts or drops in a predictable way.
- Compare the left and right sides by lifting from each corner separately. A dead side usually feels heavier or lags behind.
- Listen for a loose spring sound, a click in one side track, or a balance that no longer offers resistance.
Next move: If the sash stays put at several heights and feels evenly supported, the balances are probably still doing their job. If the sash drops, creeps, or feels heavy on one side, plan on a window balance repair rather than a lock repair.
Step 4: Check whether the window lock is actually pulling the sash tight
A weak or misaligned lock can make a window seem like it will not stay closed even when the sash and balances are fine.
- With the sash fully closed, look straight at the meeting rails and confirm they are touching evenly across the width.
- Operate the lock while watching the lock tongue engage the keeper.
- Tighten obviously loose lock or keeper screws if the holes still hold firmly.
- If the lock handle turns but does not pull the sash snug, inspect for stripped hardware, a bent keeper, or a broken lock body.
Next move: If tightening or minor alignment gets the lock to pull the sash tight, you likely only need window lock hardware. If the lock still misses because the sash is sitting off, go back to the balance or frame alignment issue instead of forcing new hardware onto a crooked sash.
Step 5: Decide between a parts repair and a frame problem
This is where you avoid wasting money on hardware when the opening itself has moved.
- If the sash now moves correctly but will not hold position, replace the failed window balance on the affected sash.
- If the sash seats correctly but the latch hardware is broken or stripped, replace the window lock and matching keeper as needed.
- If the sash binds at one corner, the gaps are uneven, and trim or drywall nearby shows movement, stop at diagnosis and have the window opening checked for frame shift or installation problems.
- After any repair, open and close the window several times and confirm it latches without body weight or twisting the sash.
A good result: If the sash moves evenly, stays where you leave it, and latches with light hand pressure, the repair path was correct.
If not: If the same corner still binds or the lock only works when you shove the sash sideways, the problem is not solved by more hardware.
What to conclude: Balances and locks are normal DIY repairs when the sash and frame are still square. Persistent racking points to a bigger opening problem.
Replacement Parts
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FAQ
Why does my window close and then slide back down?
That usually points to a failed window balance. The sash is no longer being counterbalanced, so it drifts instead of staying where you leave it.
Can a bad lock make a window seem like it won't stay closed?
Yes. If the sash reaches closed position but the latch will not catch or hold, the window lock or keeper may be loose, bent, or broken. Just make sure the sash is sitting square first.
Should I force the lock to pull the window shut?
No. That is how locks get snapped and screw holes get stripped. If the sash is misaligned, fix the track, tilt, or balance problem first.
Is this usually a whole-window replacement problem?
No. Most of the time it is a sash alignment issue, dirty tracks, worn lock hardware, or a failed balance. Whole-window replacement is usually the last answer, not the first one.
When should I call a pro for a window that won't stay closed?
Call for help if the sash feels unsafe, the frame is visibly out of square, the wall around the window is cracking or soft, or the balance system is damaged and you cannot identify it confidently.