Fiberglass Windows Cost (2026)
A mid-to-upper tier frame that is stronger and more dimensionally stable than vinyl, with a paintable surface.
$500 – $1,600
per window installed (US). Typical mid-range: $900. Canada: $600–$1,900 CAD.
Where to buy
| Tier | Where to buy | US price / window |
|---|---|---|
| Budget | Milgard fiberglass, big-box special order | ~$500 |
| Mid-range | Pella Impervia, Marvin Essential | ~$900 |
| Premium | Marvin Signature, Andersen A-Series (fiberglass/composite) | ~$1,600 |
Top brands & quality notes
Milgard (value); Pella Impervia, Marvin Essential (mid); Marvin Signature (premium).
Fiberglass expands at nearly the same rate as glass, reducing seal failure. Worth the premium in extreme-temperature climates.
Pros & cons
Pros
- Extremely durable and dimensionally stable
- Can be painted; holds color well
- Strong energy performance and long lifespan (40+ yrs)
Cons
- Costs more than vinyl
- Fewer installers specialize in it
- Premium clad lines push toward wood-window pricing
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