A window rarely fails all at once. Usually it starts small: a seal fogging up in one corner, a lock that won’t quite catch, a sash that sticks every July and won’t budge again until October. This guide covers the repairs Koalaty’s vetted window pros see most often, what each one tends to cost in 2026, and how to tell whether a repair will actually hold or whether it’s time to talk replacement instead.
Signs Your Window Needs Repair (Not Replacement Yet)
Not every window problem means you need to rush out and pay for a full replacement. Most start as isolated issues that a repair can solve right off the bat:
- A window that’s hard to open, close, or lock
- Fog or moisture trapped between the panes of a double-pane window
- A noticeable draft near the frame, even with the window shut
- Peeling paint or soft, spongy wood around the sill
- A screen that’s torn, bowed, or missing from its track
If the glass itself is intact and the frame is still structurally sound, a targeted repair usually costs a fraction of a full replacement. The trouble starts when several of these show up on the same window at once, which is covered further down.
The Most Common Window Repairs
Foggy or Fogged Glass (Failed Seals)
The seal between the panes of a double- or triple-pane window eventually breaks down, letting moisture in and causing that cloudy, foggy look that won’t wipe away. This is one of the most common calls Koalaty’s network of window pros gets. In many cases, only the glass unit needs replacing, not the whole window. Check out our in-depth guide on window condensation and how to deal with this problem on your own.
Sticking Sashes and Worn Balances
Wood windows swell and stick with humidity. Vinyl and aluminum windows develop the same problem when the spring balances that hold the sash in place wear out. A window that’s suddenly heavy to lift, or one that won’t stay up on its own, usually points to a balance that needs replacing rather than anything wrong with the frame.
Broken or Failing Hardware
Locks, latches, and cranks take a beating over the years. A lock that won’t catch is both an annoyance and a security gap, and it’s usually a quick, inexpensive fix. See our guide on how to fix broken window locks.
Weatherstripping and Draft Leaks
Worn weatherstripping is one of the cheapest problems to fix and one of the most overlooked. If a window feels drafty but closes and locks fine, the seal around the frame (not the glass) is usually the culprit.
Frame and Sill Damage
Wood sills exposed to years of rain and sun can rot at the corners. Caught early, this is a repair job. Left alone, rot spreads into the surrounding wall framing and turns into a much bigger project.
What Window Repairs Typically Cost in 2026
Window repair costs vary by region, window type, and how many windows need work, but current national averages give a useful starting point:
- Overall window repair: most jobs run $150 to $600, though simple fixes can run under $100 and complex ones can run higher
- Fogged seal repair: $75 to $210, or up to $500 if the full glass unit needs replacing
- Broken glass replacement: $75 to $500 for standard panes, more for oversized or custom-cut glass
- Balance or spring repair: $50 to $100 per window
- Sash repair: $200 to $500
- Lock or hardware replacement: $25 to $200
- Weatherstripping replacement: $50 to $150 per window, or $200 to $600 for a whole-house project
Keep in mind that these are repair costs, not replacement costs. A full window replacement typically starts around $400 per window and climbs from there depending on size, material, and glass package.
Koalaty Cost Guide
Answer a few questions for a rough planning range, then get a quote for your project.
DIY Window Repair vs. Calling a Pro
Some of these repairs are genuinely DIY-friendly. Replacing weatherstripping or a screen only takes basic tools and an afternoon. Swapping a broken lock is straightforward if the replacement part matches the original hardware.
Others are easy to get wrong. A balance repair on a wood sash, a rotted sill, or anything that requires removing the sash entirely carries real risk of turning a $100 fix into a $500 one if it’s not done right the first time. When the fix involves the glass unit itself, or when rot has spread past the surface, it’s worth having a licensed, insured, and vetted pro take a look before deciding on a repair.
When Repair Isn’t Enough
A single failed seal or one sticky sash is almost always worth repairing. But when three, four, or more windows in the house are all showing problems at once, the math starts to shift. Repairing five aging windows one at a time can add up to more than replacing them as a set, especially once labor is factored in more than once.
Age matters too. A window under 15 years old with one isolated issue is a good repair candidate. A window pushing 25 or 30 years old, especially if it’s original to the house, is often closer to the end of its useful life even if today’s problem looks small.
If it’s not clear which side of that line a home’s windows fall on, Koalaty’s vetted window pros can take a look and lay out both options honestly, with a Fair & Honest Quote either way.
FAQs About Common Window Repairs & Their Costs
How much does it cost to repair a window?
Most window repairs run between $150 and $600, depending on what’s wrong. Simple fixes like hardware or weatherstripping cost less; sash repairs and glass replacements cost more.
Can a foggy window be fixed without replacing the whole window?
Usually, yes. A failed seal typically means just the glass unit needs to be replaced, not the entire frame and sash.
Is it worth repairing an old window, or should I just replace it?
It depends on the window’s age and how many issues it has. One isolated problem on a newer window is usually worth fixing. Multiple issues on an older window often make replacement the better long-term value.
How long does a typical window repair take?
Most single-window repairs, like hardware, weatherstripping, or a balance replacement, are finished in under an hour. Glass or sash repairs may need a follow-up visit if a custom part has to be ordered.