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Recommendation · DIY if Experienced

Why Won't My Window Stay Open?

A window that slams shut or drifts down isn't a hinge problem. It's almost always the hidden counterweight system that's supposed to hold it in place giving out.

DIY time
15–45 min
Cost range
$0–500
Difficulty
Moderate
Risk
Moderate Risk

1

Before you start

Diagnose first, then act.

Double-hung and sliding sash windows use a hidden balance system, such as springs, a spiral rod or, in older homes, a weight and cord, to offset the sash's weight so it stays where you leave it. When a window won't stay open, that system has failed somewhere. Work through the causes in order.

Quick symptom check

  • Falls shut as soon as you let go Cause 3 (spring or spiral balance) or cause 4 (older sash cord)
  • Drifts down slowly, or one side drops first Cause 2 or 3: balance shoe, or one balance has failed
  • Hard to push up, but stays where you leave it Cause 1: sticky or swollen track
  • Old wood window with no visible spring Cause 4: weight-and-cord system, usually a pro job
  • You fitted a new balance and it still drops Cause 4: wrong-rated balance

Sashes are heavy and spring balances can snap back

Wear safety glasses and gloves, support the sash before you release anything, and use the right tool when tensioning a spiral balance. If the window is historic or custom, or you are unsure at any step, call a pro. Keep children away from upper-floor windows while a sash is out, and handle any broken glass with gloves.

2

Decision matrix

Every likely cause, with its own real cost and time, not one blended guess for the whole repair.

Decision matrix: cause, approach, cost, and time for Window Won't Stay Open or Is Stuck
Cause Approach Cost Time
Sticky or swollen track DIY $0–10 15–25 min
Misaligned or dislodged balance shoe DIY $0 15–20 min
Weak or disconnected spring or spiral balance DIY $15–40 per balance 30–45 min
Broken sash cord or wrong-rated balance Professional $40–500 30–90 min

3

Causes

Tap a cause to open it. Only one stays open at a time, so it's easy to compare.

4

Worth remembering

If a cause above points you toward hiring a professional, a few patterns are worth knowing before you approve anything.

Red flags

  • A quote for full window replacement when only the balances or sash cords have failed. Repair is usually a fraction of the cost.
  • Replacing the balance without weighing the sash or matching its rating.
  • No mention of whether the sash and frame are sound enough to be worth repairing.

Questions worth asking before you approve anything

  • Is this a repair or a replacement, and what does each cost?
  • Will you weigh the sash and match the balance rating, and replace both sides?
  • Is the frame or sash in good enough condition to repair?
Check what this repair should typically cost

5 · FAQ

Frequently asked questions

  • Why does my window slam shut when I try to open it?

    This is the classic sign of a failed or disconnected balance system. The counterweight that's supposed to hold the sash in place isn't doing its job. Start by checking the balance shoe alignment and spring tension.

  • Is it normal for one window balance to fail before the other?

    Yes, though both sides have usually seen similar wear. Most technicians recommend replacing both balances together even if only one has visibly failed.

  • Can I fix a window balance myself?

    Often yes, if it's a spring or spiral balance. Re-tensioning or swapping in a matched replacement is a genuinely approachable DIY task. A hidden sash-cord-and-weight system inside the wall is a different, more involved repair.

  • Why is my window hard to open even though it stays put once open?

    This points more toward a sticky or swollen track than a balance problem. Check for dirt, old paint buildup, or humidity-related swelling in the track first.

  • How do I know if my window has a hidden sash weight?

    Tilt the sash out and look inside the frame track. Modern spring or spiral balances are visible right there. If you see nothing and the window is older, it likely has a hidden weight-and-cord system inside the wall instead.

  • Is a window that won't stay open a safety issue?

    It can be, especially with heavier or larger sashes. A window that drops unexpectedly risks pinching fingers or breaking glass. Worth addressing promptly rather than propping it open indefinitely.

  • Why should both sides of the window be replaced?

    Even if only one balance has clearly failed, the other side has typically seen the same years of wear. Replacing both when you're already in there avoids the window moving unevenly, and saves a second repair down the line when the untouched side eventually fails too.

  • How do I tell which balance system my window has?

    Modern vinyl and newer wood windows typically use a spring or spiral balance visible inside the frame track once the sash is tilted out. Older wood windows, especially in homes built before the 1950s, more often use a hidden weight-and-pulley system with no visible spring at all, a good clue you're dealing with the more involved repair before you even open anything up.

  • How do I find the right replacement balance?

    Take the sash out, weigh it on a bathroom scale, and match the balance rating to that weight. Also match the type (spring, spiral or block-and-tackle), the length, and the end fittings of the old balance. Take the old one to the store if you can.

  • How can I keep the window open until it is fixed?

    Use a window stop or a simple prop that holds the sash from underneath. Do not rely on a dropping window to hold itself, and keep fingers clear of the sash edge.

  • How much does window balance repair cost?

    Balances themselves are inexpensive, about $15–40 each. A sash cord repair by a pro is usually $40–220, and more involved window repair runs $100–500.

References

Still deciding

Two other questions worth answering

This guide covers whether you can do the job yourself. These cover the two questions that often come before and after it.

Repair it or replace it?

Whether this is worth fixing at all, based on age, repair cost, and how much life it has left.

What should this cost?

Parts pricing and labor rates for your state, so you can check a quote line by line.

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