How to Fix a Window That Won't Stay Open and Keep It Secure

If your window keeps falling shut when you try to keep it open, it usually means the internal balances, springs, or tracks that hold the sash in place are worn, broken, or misaligned. Fixing this involves carefully inspecting these parts and then repairing or replacing them based on your window type. With basic tools and safety precautions, you can often fix the problem yourself without calling a professional.

Why won’t my window stay open?

Windows won’t stay open mainly because the parts that hold the sash in place have worn out or broken. These parts include springs inside the window balances, the balances themselves, or the tracks that guide the sash. Over time, springs lose tension and balances wear down, so they can’t support the sash’s weight. Sometimes, the window’s locking or tilt mechanisms are damaged or stuck, causing the sash to slip and close unexpectedly. To find the exact cause, inspect the moving parts and how they work together.

What types of windows have this issue?

This problem mostly affects single-hung and double-hung windows, which use internal balances or springs to hold the sashes open. Single-hung windows have one movable sash (usually the bottom), while double-hung windows have two sashes that both slide up and down. Sliding sash windows also use similar balance systems. Unlike casement or awning windows that open on hinges, hung windows rely on these internal supports to stay open. Knowing your window type helps you identify which parts to check and how the balance system works.

How do I check the window’s hardware and balances safely?

First, open the window fully and support the sash with one hand so it doesn’t fall. Don’t force it up or down if it feels stuck. Look along the sash edges and window frame for visible balances or springs. Check for obvious damage like broken cords, missing springs, or bent metal. If balances are hidden inside the frame, you may need to remove the sash by unlocking tilt latches and tilting the sash inward, following your window’s design. Always wear gloves to protect your hands from sharp edges and be careful of falling parts. Handle springs and balances gently—they can snap and cause injury.

How to fix a window balance or spring step-by-step

1. Identify the balance system type inside your window. Common types are spiral balances, block and tackle balances, or spring-loaded channel balances.

2. Gather tools: flathead screwdriver, pliers, drill with bits, replacement balances or springs (available at hardware stores), and safety gloves.

3. If needed, remove the sash by unlocking tilt latches and tilting it inward.

4. For spiral balances:

• Find the spiral rod at the sash side.
• Use a winding tool or screwdriver to wind the spiral and restore tension.
• Replace the spiral balance if it’s broken.

5. For block and tackle or channel balances:

• Unscrew or unclip the old balance from the frame.
• Attach the new balance securely in the same spots.
• Make sure the balance cord or spring is properly seated and tensioned.

6. Reinstall the sash, ensuring it fits properly and moves smoothly.

7. Slowly open and close the sash to test the balance function.

The exact steps can vary by window brand and model, but these cover most common repairs.

How to verify your window now stays open securely

After reinstalling the window, open the sash to several heights and let go. The window should stay open without sliding down or closing. Gently push and pull the sash to check if the balances or springs provide enough resistance. The sash should move smoothly without sticking or catching. If it slips or feels uneven, the balance might need adjustment or the hardware could be installed incorrectly.

When should I call a professional?

Call a professional if the balance mechanisms are badly corroded, broken beyond repair, or if the sash is damaged or warped. Also seek help if you’re uncomfortable working with springs under tension or removing and reinstalling the sash seems risky. Professionals can also handle misaligned frames or problems with locks and seals that affect safety and security. Complex mechanisms or structural issues are best fixed by someone with the right tools and experience.

Conclusion

Once you’ve inspected and repaired or replaced the balances or springs, your window should stay open reliably. Test it carefully, and if you encounter unexpected problems or safety concerns, a window specialist can help keep your home safe and comfortable.