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How Much Do Fiberglass Windows Cost to Install?

Average cost: $588 - $950

Low End
$588
Average
$769
High End
$950

The average cost to install a standard size double hung fiberglass window could range from $588 to $720 per window and up to $950 for other window styles, including installation. Fiberglass replacement windows can get expensive and can cost as much as or more than aluminum or wooden windows. Fiberglass windows are much more expensive than vinyl windows (which average $350 to $585 per window) for a very similar look, and that is why so many homeowners end up with vinyl frame windows installed in their homes over new fiberglass windows.

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