Composite windows have emerged as the gold standard of the industry, blending the structural integrity of wood fibers or fiberglass with advanced polymers to create frames that are virtually indestructible and highly energy-efficient.
In this guide, we break down the world’s top 10 composite window giants—from the pioneers of pultruded fiberglass to the innovators of hidden sliding systems—to help you find the perfect match for your next project.
1. JELD-WEN
JELD-WEN is one of the largest window and door manufacturers in the world, known for their extensive use of composite materials in both interior and exterior products.
- Established: 1960
- Headquarters: Charlotte, North Carolina, USA
- Key Innovations & Features: Their AuraLast® pine is a wood-composite hybrid treated to the core to resist rot and termites. They also offer a robust line of fiberglass windows that mimic the appearance of traditional wood while providing modern insulation.
- Market Focus: The broad mid-to-high-range residential market, with a presence in over 20 countries.
2. Renaissance Windows & Doors
While smaller than Andersen or Pella, Renaissance is a “specialist’s brand” often cited by architects for its superior fiberglass engineering.
- Established: 1991
- Headquarters: Houston, Texas, USA
- Key Innovations & Features: They specialize in pultruded fiberglass frames that are incredibly thin but have a higher tensile strength than steel. This allows for massive, floor-to-ceiling glass expanses without bulky frames.
- Market Focus: High-end custom homes and luxury commercial projects where “thin-frame” aesthetics are the priority.
3. Tengyu (Ningbo Tengyu)
Tengyu is a leading manufacturer specializing in high-end sliding door systems and architectural hardware, often utilized in modern composite and metal-frame window/door integrations.
- Established: 2002
- Headquarters: Ningbo, China.
- Key Innovations & Features: Tengyu is a specialist in Sliding Ghost Door Systems and Metal Frame Glass Sliding Doors. Their key innovation lies in the “Ghost” hardware technology, which creates a floating door effect by hiding all tracks and rollers. They also offer a comprehensive Sliding Pocket Door System designed for extreme space-saving and minimalist modern aesthetics.
- Market Focus: They focus heavily on the “WYSIWYG” (What You See Is What You Get) model for architects and interior designers, providing complete hardware and panel sets for luxury residential and hospitality projects worldwide.
4. Andersen Windows & Doors
Andersen is arguably the most recognized name in composite windows, specifically for their pioneering use of Fibrex® material.
- Established: 1903
- Headquarters: Bayport, Minnesota, USA
- Key Innovations & Features: Their proprietary Fibrex® material is a blend of 40% reclaimed wood fiber and 60% thermoplastic polymer. It offers the strength of wood with the low-maintenance benefits of vinyl. Their 100, 400, and A-Series lines are industry benchmarks for durability and energy efficiency.
- Market Focus: Aimed at homeowners looking for a sustainable, long-term investment. They dominate both the premium replacement market and the high-end new construction sector.
5. Marvin Windows & Doors
Marvin is renowned for its “Ultrex” pultruded fiberglass, which set the standard for composite strength decades ago.
- Established: 1912
- Headquarters: Warroad, Minnesota, USA
- Key Innovations & Features: Ultrex® pultruded fiberglass is their standout innovation, which is eight times stronger than vinyl. Their “Infinity” and “Elevate” lines use this material to create thinner frames that allow for more glass surface area.
- Market Focus: High-end architectural designs and historical renovations where the look of traditional wood is required but the performance of a composite is desired.
6. Milgard Windows & Doors (A MITER Brand)
Milgard is a powerhouse in the Western United States, known for vertical integration and custom composite formulations.
- Established: 1958
- Headquarters: Tacoma, Washington, USA
- Key Innovations & Features: The Ultra™ Series uses a glass-block-based fiberglass material that is impervious to water and corrosion. They offer a unique “Full Lifetime Warranty” that includes glass breakage, which is a significant market differentiator.
- Market Focus: Primarily the Western US and Canada, focusing on custom-size replacement windows for residential coastal properties.
7. Weather Shield Windows & Doors
Weather Shield is a favorite for historical renovations because they offer a unique “VUE” collection that blends aluminum and composite materials.
- Established: 1955
- Headquarters: Medford, Wisconsin, USA
- Key Innovations & Features: Their Z-Core™ technology is a composite frame material designed specifically to eliminate thermal bridging, making it one of the most energy-efficient options for cold climates.
- Market Focus: Architecturally driven residential projects and luxury custom homes.
8. Deceuninck
A global leader in PVC and composite systems, Deceuninck is at the forefront of European material science.
- Established: 1937
- Headquarters: Hooglede-Gits, Belgium
- Key Innovations & Features: Their Linktrusion® technology combines traditional PVC with continuous fiberglass strands or carbon fibers, significantly reducing the need for steel reinforcement and improving thermal insulation ($U$-values).
- Market Focus: Global B2B markets, supplying window fabricators across Europe, North America, and Asia with high-performance profile systems.
9. Internorm
Internorm is Europe’s largest international window brand, specializing in high-end “Timber/Aluminum” and “I-tec” composite technologies.
- Established: 1931
- Headquarters: Traun, Austria
- Key Innovations & Features: I-tec Insulation (granulated insulation injected into the frame) and I-tec Glazing (all-around bonding of the glass pane). Their products often meet Passive House standards, which are the most rigorous energy efficiency metrics globally.
- Market Focus: Luxury residential projects and ultra-low-energy buildings (Passive Houses) across Europe and the UK.
10. Chem-Pruf
While often associated with doors, Chem-Pruf is the global benchmark for composite frames in the most aggressive industrial environments.
- Established: 1975
- Headquarters: Brownsville, Texas, USA
- Key Innovations & Features: They pioneered the first completely integrated fiberglass door and frame system. Their products are resistant to over 500 chemical Corrosives and are designed for “clean room” environments.
- Market Focus: Industrial, pharmaceutical, and wastewater treatment facilities where traditional metal or wood windows would corrode within months.
The manufacturers listed above represent the pinnacle of material science in 2026, offering solutions that withstand extreme temperatures, resist coastal corrosion, and drastically reduce energy bills.
Global innovators like Internorm and Tengyu are pushing the boundaries of what is possible with minimalist hardware and ultra-insulated frames. As you plan your project, consider not just the look of the frame, but the technology behind the composite to ensure your view stays beautiful for decades to come. Seeking a manufacturer for your composite window project? Contact Tengyu experts in custom metal frame glass systems and architectural solutions; we offer full customization support.
