Windows are not just glass and frames— they’re all about energy efficiency, looks, and longevity. With homeowners and builders looking for improved-performing materials, composite windows have become the popular choice. Composite windows bring the best qualities of wood, vinyl, and fiberglass together to provide enhanced insulation, weather resistance, and durability.
With innovation powering the sector ahead, some of the top composite windows manufacturers are making it happen in 2025. No matter whether you require sustainable designs, impact-resistant or sleek, clean, contemporary aesthetics, they all provide you with various products catering to varying demands. Here’s an analysis of the best 8 players designing the composite Windows future and how they outstand others.
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8 Best Composite Windows Manufacturers in 2025
Here are eight composite window manufacturers with detailed descriptions of their composite window collections:
1. Andersen Windows & Doors
- Location: Bayport, Minnesota, USA
- Company Type: Manufacturing
- Year Founded: 1903
- Number of Employees: Approximately 9,000
- Main Products: Fibrex composite windows and doors
Andersen Windows & Doors is a leader in composite window technology, offering innovative and high-performance solutions to homeowners. Their proprietary Fibrex composite material is created from recycled wood fibers and thermoplastic polymers to offer a window that is twice as durable as vinyl and resistant to warping, cracking, and rotting. Their high-performance material has excellent thermal insulation properties with minimal heat transfer, improving energy efficiency.
Whereas regular materials cannot withstand extreme weather and maintain their attractiveness and longevity in the long term, Fibrex® is designed to withstand the elements while maintaining its attractiveness and stability in the years ahead.
Andersen’s composite window line features a variety of styles to match different architectural designs. Their 100 Series window, made entirely of Fibrex®, is a best seller, with clean and contemporary style and casement, double-hung, awning, sliding, and picture window availability.
2. Mannlee
- Location: Foshan, Guangdong, China
- Company Type: Manufacturing
- Year Founded: 1998
- Number of Employees: 300
- Main Products: Windows, Doors, and Energy-Efficient Products
Mannlee composite windows are designed to offer superior strength, durability, and energy efficiency, making them an ideal choice for those wanting the best-in-class performance and long-lasting protection. The windows are constructed from a union of superior-quality materials such as reinforced frames and laminated glass, which is more resistant to extreme weather conditions such as hurricanes, storms, and even burglary. The composite construction marries the strength of the old materials with the benefits of new engineering in windows that can withstand pressure.
Besides storm resistance, Mannlee composite windows are also engineered to be energy-efficient. Their high-tech construction resists the transfer of heat, keeping homes cool during the summer and removing the necessity of excessive air conditioning. This can lead to great savings on cooling costs in the long term. If you require weather-resistant windows or simply want a more energy-efficient one, Mannlee’s composite windows provide superior protection and reduced energy consumption.
3. Pella Corporation
- Location: Pella, Iowa, USA
- Company Type: Manufacturing
- Year Founded: 1925
- Number of Employees: Approximately 7,000
- Main Products: Vinyl, wood, and fiberglass windows
Pella may be best known for wood and vinyl windows, but their fiberglass windows are a fantastic option for homeowners who desire the efficiency and longevity of composite materials. Pella fiberglass windows are designed to be superior to vinyl and more resistant than traditional wood, making them an excellent substitute for common composite materials.
Fiberglass windows never warp, rot, or corrode, so they’re well-suited for application in severe weather conditions. Moreover, their higher insulation values make them energy-efficient, maintaining homes warm in winter and cool in summer. Pella’s Impervia line spearheads their range of fiberglass products with double-hung, casement, awning, sliding, and picture windows that bring both durability and clean lines of contemporary style. Available in numerous colors and finishes, they require little maintenance but carry high-end good looks.
4. Marvin Windows
- Location: Warroad, Minnesota, USA
- Company Type: Manufacturing
- Year Founded: 1912
- Number of Employees: Approximately 5,000
- Main Products: Wood, clad-wood, and fiberglass windows.
Marvin is renowned for the exceptional craftsmanship and the high-performance materials it uses, and their fiberglass windows are a testament to that. Designed to be harder and more rigid than vinyl or wood, Marvin’s fiberglass windows resist expansion and contraction, and they are the best for high thermal fluctuations. They are good insulators, maintaining comfort within while minimizing energy costs. Unlike traditional composite products, Marvin’s fiberglass lasts for decades with minimal maintenance and is an easy option for homeowners looking for style and performance.
Marvin’s fiberglass window lines include the Essential™ and Elevate™ series, available in double-hung, casement, awning, and sliding windows in many sizes and finishes. The Essential™ series boasts a clean, modern look with fiberglass on the exterior and interior for maximum durability, and the Elevate™ series combines the natural elegance of wood interior finishes with the ruggedness of fiberglass exterior.
5. Milgard Windows & Doors
- Location: Tacoma, Washington, USA
- Company Type: Manufacturing
- Year Founded: 1962
- Number of Employees: Approximately 3,000
- Main Products: Vinyl, fiberglass, and aluminum windows
Founded in 1962, Milgard Windows & Doors has been leading the way in making high-quality windows and doors for over six decades. Headquartered in Tacoma, Washington, Milgard operates multiple manufacturing plants throughout the Western United States, ensuring the finest workmanship and continuous delivery. The company is noted for its commitment to innovation, performance, and customer satisfaction, with energy-efficient offerings at the pinnacle of its concern.
Milgard’s Ultra™ Series fiberglass windows are the ultimate choice for homeowners looking for a strong, low-maintenance, and energy-efficient option compared to traditional composite materials. These windows come in a range of designs—double-hung, casement, awning, sliding, and picture windows—and are engineered to resist swelling, rotting, and warping—perfect for harsh weather environments.
6. Simonton Windows
- Location: Parkersburg, West Virginia, USA
- Company Type: Manufacturing
- Year Founded: 1946
- Number of Employees: Approximately 1,000
- Main Products: Vinyl windows
Founded in 1946, Simonton Windows is now one of the most recognized names in the window industry, manufacturing luxury vinyl windows that offer a wide range of the same benefits as composite materials. Located in Cary, North Carolina, Simonton is highly regarded for its focus on energy efficiency, reliability, and affordability.
Simonton’s Reflections® and Prism® Series are two of their top-selling window lines, which include double-hung, casement, sliding, and picture windows in diverse finishes and grid styles. These windows are made to resist warping, fading, and cracking so that they can serve for many years without requiring repeated maintenance. Many Simonton windows are also ENERGY STAR® qualified, helping homeowners save money on energy consumption while remaining comfortable indoors.
7. Kolbe Windows & Doors
- Location: Wausau, Wisconsin, USA
- Company Type: Manufacturing
- Year Founded: 1946
- Number of Employees: Approximately 1,000
- Main Products: Wood, vinyl, and aluminum windows
Founded in 1946 with its offices in Wausau, Wisconsin, Kolbe Windows & Doors is synonymous with its high-quality craftsmanship and highly personalized window products. While Kolbe has an array of materials to choose from, including wood, aluminum-clad, and vinyl, the majority of their high-performance window lines has composite-like strength and energy efficiency. Its windows are crafted to withstand harsh weather conditions and still retain their beauty, an ideal choice for both traditional and modern homes.
Kolbe’s Forgent® Series is one of their finest offerings, featuring a proprietary Glastra® material—a combination of fiberglass and UV-stable polymer that gives them superior strength, low maintenance, and energy efficiency. Available in casement, awning, double-hung, sliding, and picture window configurations, the Forgent® Series provides rapid installation and enduring performance.
8. JELD-WEN
- Location: Charlotte, North Carolina, USA
- Company Type: Manufacturing
Year Founded: 1960 - Number of Employees: Approximately 21,000
- Main Products: Wood, vinyl, and aluminum windows
JELD-WEN’s Auraline® True Composite Windows bring a new blend of wood fiber and synthetic polymer, and they are the highest-quality replacement for traditional composite options. Twice as powerful as vinyl, these windows offer increased strength, improved thermal performance, and a sleek, modern appearance.
Double-hung, casement, awning, and sliding styles are just a few of the options offered with Auraline® windows that resist warping, rot, and fading to maintain their appearance for many years to come. With an emphasis on sustainability and ENERGY STAR® qualification, JELD-WEN provides consumers with appealing, energy-saving, and long-lasting window solutions to compete with traditional composite materials.
Wrapping Up
Choosing the perfect composite window producer is a vital aspect of ensuring your business or residence has windows that look fabulous but also deliver exceptional durability and energy efficiency. All 8 of the top composite window manufacturers featured here are outstanding for their distinctive style, superior materials, and reliability you can depend on.
If you’d like to continue exploring the greatest manufacturers across sectors, Mannlee has got you covered! Read more insights on the highest-rated brands in our other blog posts.
