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 2026. 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 10 players designing the composite Windows future and how they outstand others.
Contents
What Makes A Composite Window Manufacturer the Best?
This is what truly matters when picking the top composite window maker:
- Good companies use strong composite substances such as fiberglass or wood-plastic blends that are built to last.
- Choose companies that offer ENERGY STAR® windows known for being energy-efficient and well-insulated.
- Top companies offer an array of fashionable colors, types of finishes and window models that go with any house.
- The top version of composite windows requires minimal repair and painting, lessening your workload.
- Products from reliable producers are always tested and certified to handle weather, impacts and wind.
- Looking at the Warranty & Customer Service reveals if they trust their product enough to stand by it.
- Positive reputation comes from having many quality reviews and dependable partners.
10 Best Composite Windows Manufacturers in 2026
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
- Price Range: $185 – $1,800 per window (Fibrex 100 Series: $185–$315)
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
- Price Range: $350 – $850 per window
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
- Price Range: $736 – $1,200 per window
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.
- Price Range: $900 – $1,500 per window
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
- Price Range: $600 – $1,200 per window
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
- Price Range: $300 – $700 per window
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
- Price Range: $800 – $1,400 per window
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
- Price Range: $600 – $1,200 per window
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.
9. Weather Shield Windows & Doors
- Location: Medford, Wisconsin, USA
- Company Type: Manufacturing
- Year Founded: 1955
- Number of Employees: Approximately 2,000
- Main Products: Wood-clad, fiberglass, and composite windows
- Price Range: $850 – $1,600 per window
In 1955, Weather Shield Windows & Doors was established in Medford, Wisconsin and today it is known for being innovative and making high-quality windows. There are many types of windows available from the company, designed to be both energy efficient and built to last. Windows made from composite and fiberglass by Weather Shield can endure extreme conditions and still look great and perform well.
This contemporary collection is made with advanced fiberglass and composite which ensures strong windows, requires little maintenance and keeps rooms cooler or warmer. These windows are made as casement, awning, double-hung and specialty shapes and suit both modern and traditional buildings. Since Weather Shield focuses on sustainability and customization, homeowners selecting good-quality windows will often choose them.
10. Alside
- Location: Cuyahoga Falls, Ohio, USA
- Company Type: Manufacturing
- Year Founded: 1947
- Number of Employees: Approximately 3,000
- Main Products: Vinyl and composite windows
- Price Range: $500 – $1,200 per window
Established in 1947 and located in Cuyahoga Falls, Ohio, Alside is well known throughout the country for their use of innovative products in windows and exterior construction. While Alside’s reputation comes from its vinyl windows, its Mezzo® and Fusion® composite windows offer homeowners strong and efficient products at an affordable price.
These windows from Alside are made to be durable, able to withstand different weather and require little maintenance. You can find these windows in different designs such as double-hung, sliding, casement or picture and the colors and finishes will match the look of any house. Because Alside pays attention to energy efficiency and style, their composite windows give excellent performance and look attractive over the years.
FAQs About Composite Manufacturers
How do I choose a composite window company?
Check what kind of materials are being used. Fiberglass and wood-composite mixes are very durable. Be sure to look for the ENERGY STAR® certification and see what reviews say about the company’s performance, customer service and warranties. Another point to check is the company’s period of operation and whether their models and features are suitable for the settings in your house.
What are the best composite windows?
The top composites today are built using fibreglass, wood-plastic composites or blends of different polymers. They need to have strong insulation, be built to resist changes from moisture and warping and clean up nicely with very little effort. Top performing models include multi-pane glass, low-E coatings and airtight seals to help you save energy. A quality composite window is made with materials that are strong, insulating and attractive.
Who makes the best composite windows?
Those working in the industry like Andersen, Marvin and Mannlee as the top producers of excellent composite windows. Mannlee is appraised mainly for its advanced materials and skilled engineering. Their composite windows are good at keeping out cold, require little upkeep and last for a long time. Mannlee sets itself apart by combining good looks with strong and efficient 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 10 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.
