How to Fix a Window That Won't Stay Up (4 Common Causes)

TL;DR: Windows that slide down are usually suffering from broken balance springs (the coiled metal tubes inside the frame) or worn tilt shoes (the plastic pivots in the sash corners). Both are DIY-fixable with $10–30 in parts from a hardware store. If the track is painted shut or the rope-and-pulley system has snapped, you'll need to free the sash or restring the weight. Most repairs take 30–60 minutes per window.

_Last reviewed: July 2026 · 6 min read_

A window that won't stay open is more than an annoyance—it's a safety risk if propped with a stick, and it signals that the balance mechanism has failed. Most American homes built after 1960 use spiral balance springs or block-and-tackle channels; older homes may still have rope-and-pulley weights. The fix depends on which system you have, but all four common causes are repairable without replacing the entire window.

Okoniq Property Hub lets you log every window repair with photos and part numbers, so you know which units have been serviced and when the next balance-spring failure is likely.

Why does a double-hung window fall when I let go?

The sash is heavier than the counterbalance force holding it up. In a spiral-balance system, a coiled spring inside a metal tube twists as the window rises, storing energy to support the sash weight. When the spring breaks or loses tension, the tube goes limp and the window drops. You'll often hear a metallic ping when the spring snaps. In a rope-and-weight system (common in homes built before 1950), a cotton rope runs over a pulley to a cast-iron weight hidden in the wall cavity; if the rope frays and breaks, the sash has nothing to hold it.

To diagnose, open the window halfway and release it gently. If it slides down smoothly, the balance is broken. If it jerks or binds, the track may be painted or the tilt shoe may be cracked. Pull the sash out (most tilt inward by pressing the side jamb clips) and inspect the edges: you'll see either a spiral-balance rod poking from the side or a rope emerging from a pulley mortise at the top of the frame.

Replace spiral balances in pairs—even if only one side broke, the other is the same age and will fail soon. Balances are sold by sash weight and tube length; weigh the sash on a bathroom scale and measure the tube pocket to get the right part. Most big-box stores carry generic replacements for $8–15 each, or you can order exact matches from the original window manufacturer if you have the model number.

What if the window falls only partway, then stops?

The tilt shoes—the plastic pivots at the bottom corners of the sash—are worn or broken. These shoes slide up and down in the vertical track and also allow the sash to tilt inward for cleaning. Over time, the plastic wears down or cracks, and the shoe no longer grips the balance rod firmly. The sash may drop a few inches and catch, or it may tilt at an angle when you raise it.

Remove the sash by tilting it toward you and lifting it out of the frame. Flip it over and look at the bottom corners: you'll see a metal pin or tongue sticking out, held by a small plastic block (the tilt shoe). If the shoe is cracked or the pin is loose, pop out the old shoe with a flathead screwdriver—most are held by a single screw or friction clip. Replacement shoes are $3–5 each and come in standard colors (white, tan, bronze); bring the old one to the hardware store to match the profile.

When reinstalling, make sure the balance rod seats fully into the new shoe. Some designs require you to twist the rod to load the spring tension before snapping the shoe into the jamb channel. If you skip this step, the window will still fall. Tilt both sides of the sash back into the frame, lower it to check that it holds at multiple heights, then test the tilt function to confirm the shoes lock properly. For multi-unit landlords tracking dozens of windows, logging each tilt-shoe replacement in Okoniq helps you spot patterns—if one batch of shoes fails early, you can preemptively replace the rest.

What if the window is stuck and won't move at all?

Paint or dirt has sealed the sash to the frame, or the parting bead (the thin vertical strip between upper and lower sashes) is swollen from moisture. Run a utility knife along the seam where the sash meets the jamb, cutting through any paint film. Tap a wide putty knife into the seam with a rubber mallet to break the bond—work your way around all four edges before trying to lift.

If the window still won't budge, the parting bead may be the culprit. Remove the interior stop molding (the trim that holds the lower sash in place) by prying gently with a flat bar; this lets you pull the lower sash out completely. Inspect the parting bead: if it's swollen or cracked, pull it out and replace it with a new length from the hardware store ($2 per 8-foot piece). Sand the sash edges and the jamb track lightly to remove paint buildup, then apply a thin coat of paraffin wax or silicone spray to the track—never use oil-based lubricants, which attract dust and gum up the mechanism.

While the sash is out, check the rope or balance rod. In older homes with sash weights, a broken rope means you'll need to open the access panel in the side jamb (usually covered by a small rectangular piece of trim) and restring the weight. Tie a figure-eight knot in the new sash cord, thread it over the pulley, attach it to the weight, and adjust the length so the weight hangs about 3 inches above the sill when the window is fully open. This repair is tedious but permanent—cotton sash cord lasts 30–50 years if installed correctly.

How do I fix a window that stays up but feels too heavy to lift?

The balance spring is over-tensioned or the wrong weight rating. Spiral balances are color-coded or stamped with a weight range (e.g., "15-20 lbs"); if someone installed a 20–25 lb balance on a 15 lb sash, it will be stiff to open. The fix is to either reduce the spring tension (some tubes have an adjustment collar you twist) or replace the balance with the correct rating.

To adjust tension, remove the sash and locate the metal pin at the top of the spiral tube. Insert a tension tool (a flat blade or the edge of a screwdriver) into the slot and rotate the tube counter-clockwise 3–4 full turns. Reinstall the sash and test; repeat until the sash glides smoothly and holds at mid-height without drifting. Be careful—releasing tension too quickly can cause the spring to unwind violently and whip the tool out of your hand.

If the balance is the correct weight but still feels stiff, the track may have debris or the sash may be binding on the parting bead. Vacuum out the jamb channels, wipe with a damp cloth, and apply paraffin wax to the contact surfaces. Check that the sash is square in the frame—if one corner sits proud, the shoe may not be seated fully in the track.

When should I call a professional instead of DIYing?

If the window frame is rotted, the jamb is out of square, or the glass is cracked, the repair scope expands beyond balance springs. Rotted sills and jambs need carpentry work to replace the wood before new balances will function. If the sash itself is damaged—cracked muntin bars, broken glass, or a warped stile—you may be better off ordering a replacement sash insert (the moving part without the frame) from the window manufacturer, which typically costs $150–300 installed.

For homes with original rope-and-weight systems and plaster walls, opening the jamb access panel can crack the plaster or reveal lead paint. If you're not equipped to manage lead-safe work practices (wet sanding, HEPA vacuums, plastic sheeting), hire a certified lead-safe contractor to do the restringing. In rental properties, lead paint disturbance triggers disclosure and possible EPA fines if not done correctly.

If you've replaced the balances and shoes but the window still won't stay up, the frame itself may have shifted—common in older homes with foundation settlement. A window installer can shim the frame back to plumb and square, which costs $100–200 per opening but ensures the repair lasts. For properties with multiple failing windows, consider a whole-house assessment to identify whether foundation movement is the root cause, which would make spot repairs futile. Tracking which windows fail first in Okoniq can reveal patterns tied to exposure (south-facing sun damage) or structural issues (settling near a corner).

FAQ

How much does it cost to fix a window that won't stay up?

DIY parts (spiral balances and tilt shoes) run $10–30 per window, with 30–60 minutes of labor. Professional repair typically costs $75–150 per window, including parts and service call. Replacing a full sash insert ranges from $150–300 depending on size and glass configuration.

Can I just prop the window with a stick instead of fixing it?

Propping a window with a stick is a fire-code violation in most jurisdictions—it prevents the window from being used as an emergency exit. Sticks also fall out, creating a risk if the window drops on someone's hands. Fix the balance mechanism or lock the window shut until you can repair it.

Do I need to replace both balance springs even if only one broke?

Yes. Balance springs wear at the same rate, so the second one will likely fail within weeks or months. Replacing both at once ensures even support and avoids a repeat service call. Always replace in pairs, left and right.

How long do spiral balance springs last?

Spiral balances typically last 15–25 years in moderate climates. In humid or coastal areas, rust can shorten lifespan to 10–15 years. Rope-and-weight systems last 30–50 years if the rope is cotton sash cord, but cheap synthetic cord may fail in 10–15 years.

Will fixing the balance also fix a drafty window?

No. Balance failure and air leakage are separate issues. After repairing the balance, check the weatherstripping around the sash perimeter and replace any cracked or compressed foam or felt strips. If the window still leaks air, the meeting rail (where upper and lower sashes meet) may need adjustment or a new V-seal.

This is educational information, not professional advice. If your window frame is rotted, the glass is cracked, or you suspect lead paint, consult a licensed contractor or certified lead-safe renovator before starting work.