If your window is foggy between the panes or cracked but the frame and sash are solid, you can often replace just the insulated glass unit (IGU).
Cost at a glance
| Cost | Source | |
|---|---|---|
| Average glass-only replacement | $280-$350 | Inch Calculator, window replacement cost |
| Full window replacement, for comparison | $517 average | This Old House, window replacement cost survey (2026) |
What affects the price
- Pane size and type: larger, tempered, laminated or low-E glass costs more.
- Double vs single pane.
- Warranty: many manufacturers cover seal failure for 10-20 years: check before paying.
Ways to save
- Check your window warranty, foggy glass from seal failure is commonly covered.
- Replace glass rather than the whole window if the frame is sound and the window is otherwise efficient.
Get an accurate price
Online averages are a starting point. Window prices depend on exact sizes, your home’s condition and local labor rates, so the only reliable number is an itemized, in-home quote. Compare at least three, and use our window cost calculator to sanity-check them.
Frequently asked questions
Why is my window foggy between the panes?
The seal around the insulated glass has failed and moist air has entered. It doesn’t fix itself; the glass unit needs replacing.
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