Fiberglass Windows Prices 2026
Discover fiberglass windows prices, which range from $1,400 to $2,400 fully installed for a standard sized double hung window. Lots of factors affect price, including window manufacturer, type of window, glass package annd upgrade, the window sizes and how difficult or simple the installation.
Bill - Site Editor - Publish Date - December 8, 2013
Page Last Updated July 30, 2026
Fiberglass Windows Prices 2026
$1,400 to $2,400 fully installed
Fiberglass Windows Prices (Excluding Installation)
Entry Level Pricing
Entry level pricing involves a lower end fiberglass extrusion and an overall window without the bells and whistles you can expect on the mid range and high end models. This typically includes a lower end low-e glass package, limited frame color options and features. Lower priced models will often be a slider or single hung. The prices below are for a normal size double hung with normal installation.
-- Price Range: $1,000 to $1,400 (excluding installation)
Standard Pricing
Standard pricing will often be a more substantial extrusion (possibly with sash reinforcements) with several nice upgrades such as vent stops, better locking mechnism, weep hole covers etc. Expect a nicer glass option and fills. They should be more color and finish options for the frame and better hardware. Standard options will incorporate a bigger selection, including casements and double hungs.
-- Price Range: $1,400 to $1,800 (excluding installation)
High End Pricing
Premium products should have the highst quality extrusion with reinforced sash and excellent design. Expect a high end glass with an excellent low-e option and fills. Also expect top of the line upgrades and lots of options on the frame color, finish and hardware.
-- Price Range: $1,800 to $2,100 (excluding installation)
Installation Costs
Installation costs run $75 - $175 per opening for pocket and insert installation. Standard installation that requires removing the sills runs more like $100 - $250 per opening, while full frame installation that requires removing the stops, sill and the jambs runs around $250 to $450 per opening. Each replacement project has its own set of unique issues and is the reason we suggest multiple estimates from different contractors to find the best fit for your job.
Total Fiberglass Windows Prices
Low End Projects
Low end fiberglass window cost range from $1,400 to $1,750 per window installed. Examples in this price range include the Builder Series and the Pella Impervia series.
-- Price Range: $1,400 to $1,750
Mid Range Projects
Mid range fiberglass window cost range from $1,750 to $2,100 per window installed. Examples in this price range include the Marvin Integrity Window and the Milgard Ultra.
-- Price Range: $1,750 to $2,100
High End Projects
"I'm replacing the original 40-year-old windows in my house and have narrowed it down to two quotes. One is for Marvin Infinity fiberglass full-frame replacements, and the other is for ProVia vinyl replacement windows. The ProVia bid is about 15% less.
I'm torn. The ProVia windows have slightly better energy ratings, but I like the look of the Marvin windows more. Has anyone compared these two?"
Herb, I'd probably lean toward the Marvin option because of the full-frame installation. If the ProVia quote is for the Endure series, it's a very good window, but fiberglass generally holds up better over the long term. If you're planning to stay in the house for 15 years or more, I'd choose Marvin. If not, saving the money with ProVia also makes sense. They're both solid products.
Bill — Website Editor - from 2026 ⭐ PRO MOVE - always collect 2 to 3 project quotes, compare pricing, and save $$$! ⭐
High end end fiberglass window cost range from $1200 to $2,400 per window installed. Examples in this price range include the Marvin Infinity and the Inline Premium Series.
-- Price Range: $2,100 to $2,400
Marvin Infinity vs ProVia Windows
Window Series
Frame Material
Installation Type
Relative Quote
Marvin Infinity
Fiberglass
Full-frame replacement
Higher quote
ProVia Vinyl Replacement Windows
Vinyl
Replacement installation
Approximately 15% less
Herb - Homeowner - from 2026
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