Fiberglass & Composite Windows: Strong, Low-Maintenance Options

A well-made fiberglass or composite window can be lighter and stronger than that of a more traditional material.  Fiberglass and composite materials are naturally resistant to water, insects, and environmental damage. With simple upkeep, these windows can typically last between 30 and 50 years.

Fiberglass/composites also perform extremely well in varying temperatures. They will not warp, shrink, or expand as the seasons change. The material’s strength allows for slimmer frames and clean, modern profiles. Vinyl windows tend to be bulkier, while fiberglass/composite windows offer a sleeker look with more visible glass. This makes them a favorite for contemporary designs and homeowners who want a refined finish.

At 12 Penny Exteriors, we can guide homeowners through the limited but high-quality fiberglass and composite options available. These windows are more expensive and offer fewer customization paths than vinyl or most wood-clad products, but they deliver premium durability, long-term value, and excellent energy performance.

Why Choose Fiberglass or Composite

• Stronger and more dimensionally stable than vinyl
• Excellent energy efficiency and noise reduction
• Resistant to weathering, moisture, bugs, and decay
• Long-lasting construction with reliable warranties
• Sleek, modern frames that maximize glass area
• Made from natural or recyclable materials