When should I repair a window instead of replacing it?

Repair when the window is structurally sound and one part has failed: broken glass, a bad lock, worn weatherstripping, a sticking sash, or a single fogged pane. These are $75–$400 fixes, not a reason to replace the whole window.

When is it time to replace windows?

Replace when the frame is rotted, the seals have failed across many windows (fog between the panes), single-pane glass is costing you comfort, or a window won't open, close, or lock safely. Those are structural and safety problems a repair can't solve.

Can a foggy double-pane window be fixed without replacing it?

Sometimes. If just the sealed insulated glass unit has failed, it can occasionally be swapped for $150–$400 — far less than a full window. One fogged window is a repair; fog across the whole house means the windows are near end of life.

Do new windows pay for themselves in energy savings?

Rarely within their own lifetime on energy bills alone. Replace windows because they're failing, drafty, or you're improving the home — the comfort, quiet, and look are the real return. Energy savings are a bonus, not the business case.

What does window replacement cost in 2026?

Per window installed: $450–$1,200 for standard vinyl or fiberglass, more for wood or custom sizes. A whole-house replacement of 10–20 windows commonly runs $8,000–$20,000+, usually at a per-window discount over doing them one at a time.

Repair or replace your windows?

A drafty window or a foggy pane doesn't force a decision the way a dead furnace does — which is exactly why the choice drags on for years. You can almost always repair a window. The real question is whether the repair is worth it, or whether you're spending money to postpone a replacement that's coming anyway. Here's how to tell.

When a window repair is the right call

Repair when the window is fundamentally sound and one part has failed. On a frame that isn't rotted and sashes that still operate, these are cheap, sensible fixes:

Broken glass or a failed lock/latch: a single-pane replacement or new hardware, usually $75–$200.
Worn weatherstripping or a draft: re-sealing and new weatherstripping runs $50–$150 and can fix most of the cold-air complaint.
Sticking or painted-shut sashes: a service call to free them up, not a reason to replace.
A single fogged double-pane unit: the insulated glass unit (the sealed glass, not the whole window) can sometimes be swapped for $150–$400 — far less than a full replacement.

When it's time to replace

Replace when the window's structure or performance is failing, not just a part:

Rotted or crumbling wood frames: once the frame is gone, there's nothing to repair against. This is the clearest replace signal.
Fog or condensation between panes across many windows: the seals have failed and the insulating gas has leaked out. One window is a repair; a houseful is a replacement project.
Single-pane windows in a cold or hot climate: no repair makes single-pane glass efficient. If comfort and energy bills are the problem, only replacement solves it.
Windows that won't open, close, or lock safely: an egress and security issue, not a cosmetic one.

The efficiency math most people miss

New windows are sold on energy savings, but the payback is slower than the sales pitch suggests. A full-house replacement rarely pays for itself in energy bills alone within its own lifetime. Replace windows because they're failing, drafty, or you're improving the home — not on the promise that they'll pay for themselves. The comfort, the quiet, and the look are the real return; the energy savings are a bonus, not the business case.

What window replacement costs in 2026

Per window, installed: $450–$1,200 for standard vinyl or fiberglass, more for wood, large custom sizes, or specialty shapes. A whole-house replacement of 10–20 windows commonly runs $8,000–$20,000+. See our methodology for how we build cost bands. Doing the whole house at once usually earns a per-window discount over replacing them one at a time.

The bottom line

Repair a sound window with one broken part. Replace when the frame is rotted, the seals have failed across the house, or single-pane glass is costing you comfort every winter. And if you're weighing windows as a pre-sale upgrade, know this: they help a house show well, but like most big projects they rarely return their full cost — read what upgrades actually add resale value before you spend.

Also worth reading: how much to budget for home maintenance so a full window project doesn't blindside you.