Why Won’t My Window Stay Open?

A window that won’t stay open is more than an annoyance. A sash that drops without warning can pinch fingers, and a window you can’t prop open isn’t much use on a warm day.

The good news is that this is one of the window problems most likely to have a simple fix. The cause is usually a part, not the whole window. This guide walks through the likely culprit for each type of window, what the repair involves, and the situations where replacement does make more sense.

First, What Kind of Window Is It?

The fix depends on how the window opens and how old it is.

If you’re not sure which you have, look at the side of the frame. A wood window with small round pulleys near the top of the frame likely uses cords and weights. A window with a vinyl or metal track and a sash that tilts in for cleaning uses spring balances.

Double Hung and Single Hung Windows That Slide Down

Modern hung windows don’t rely on friction to stay open. Each sash is held up by a pair of balances, spring-loaded mechanisms hidden in the side tracks that offset the weight of the glass. When a balance stops doing its job, gravity wins.

Check this first: a sash that’s come off its shoe. On tilt-in windows, small pins on the bottom corners of the sash ride in plastic “shoes” attached to the balances. Andersen’s homeowner guidance notes that when a sash slides down and won’t hold its position, the pivot pin may simply not be engaged in the balance shoe. This can happen after a sash has been tilted in for cleaning and set back in place. Re-seating the sash in its shoes can fix the problem without any new parts.

If that doesn’t work, the balance has likely worn out. Most hung windows use one of three kinds:

• Spiral balances: a twisted rod inside a tube
• Block-and-tackle balances: a cord and small pulleys inside a channel
• Constant force balances: a flat coiled spring, similar to a tape measure

All three use springs that can lose tension over years of use, and cords or coils can eventually break. Replacing a balance is a parts repair, not a window replacement. Balances are sized to the weight of the sash, so the new ones need to match, and it’s usually best to replace them in pairs so both sides pull evenly.

When parts are hard to find. For older windows from discontinued product lines, exact replacement balances can be hard to find. That doesn’t automatically mean replacement, but it’s worth knowing before you start.

Older Wood Windows With Sash Cords and Weights

Some older homes in Cleveland and Akron still have their original wood double hung windows. These use a much older system: each sash hangs from ropes or chains that run over pulleys at the top of the frame and attach to counterweights hidden in a pocket inside the frame. When a cord breaks, that side of the sash loses its counterweight and the window won’t stay up.

This is a well-understood repair. The National Park Service’s guide to repairing historic wooden windows calls replacing sash cords with new rope or chain one of the most common work items. The weight pocket can often be reached through a small access door near the bottom of the frame, or by removing the interior trim. Ohio’s State Historic Preservation Office describes the same process in its own homeowner guide.

Two other things can make an old wood window hard to open or keep open:

• Paint buildup. Decades of paint can glue the sash to its stops or bind the cords. The NPS notes that removing excess paint layers helps the window operate again.
• Swollen or loose wood. Moisture and seasonal changes can make a wood sash stick or rattle in its frame.

If your home was built before 1978, assume the old paint may contain lead and take precautions before scraping or sanding. See the safety section below.

Casement and Awning Windows That Won’t Stay Put

Casement and awning windows don’t use the spring balances found in hung windows. The crank operator at the bottom of the frame, working with the hinges, both opens the sash and holds it in position. If the operator’s gears wear out, the sash can drift or swing with the wind instead of staying where you set it.

Signs the operator is the problem:

• The crank handle spins but the window doesn’t move
• You hear grinding or clicking when you turn the crank
• The sash moves on its own when it’s windy

Family Handyman notes that a handle that turns without moving the window usually means the gears on the handle, the operator shaft, or both are stripped. If only the handle is worn, the handle can be replaced on its own. If the operator itself is worn, the whole operator is replaced. Either way, the sash, glass, and frame stay put.

If the sash moves fine but sags, rubs, or won’t close evenly, the hinges may be worn or bent. Hinge sets can often be replaced too, though the work is more involved than swapping an operator.

For more on how casements compare to double hung windows, see Double Hung vs. Casement Windows.

Repair or Replace? An Honest Look

A window that won’t stay open is one of the clearest cases where repair is often the right answer. The broken part is usually small, and the rest of the window may have plenty of life left.

Repair usually makes sense when:

• The frame and sash are solid, with no rot, cracks, or warping
• There’s no fog trapped between the panes
• The window doesn’t let in drafts when it’s closed and locked
• Replacement parts are available for your window
• It’s a historic wood window you want to keep, which the National Park Service notes can often be repaired even when it looks rough

Replacement starts to make more sense when:

• The window has other problems too, like failed glass seals, drafts, or soft wood
• Parts for your window are discontinued and no workable substitute exists
• The frame itself is damaged, so new hardware won’t fix how the sash fits
• The window is near the end of its expected lifespan for its frame material

If you’re weighing the two, our guides to repairing or replacing a drafty window and how long windows last can help you size up the rest of the window. If you’d like a professional to look at your windows, Empire offers a free, no-pressure in-home consultation.

Safety While the Window is Broken

Don’t prop it with your hand in the opening. A sash with a failed balance or cord can drop suddenly. Use a piece of wood cut to length to hold it open, and keep children’s hands away from the sill until it’s fixed.

Be careful with springs and weights. Balances are under tension and can snap back when they’re removed, and the Ohio State Historic Preservation Office cautions homeowners to be careful handling heavy sash, sash weights, and glass.

Watch for lead paint in older homes. If your home was built before 1978, the window paint may contain lead. The U.S. EPA notes that about nine out of ten homes built before 1940 have lead-based paint. Scraping, sanding, or prying painted window parts can create hazardous dust. The EPA recommends hiring a lead-safe certified contractor for this kind of work in pre-1978 homes, and its Renovation, Repair and Painting Rule requires paid contractors who disturb paint in those homes to be certified. Window replacement is always covered by that rule, no matter how small the job.