Custom windows focus on both functionality and aesthetics. This combination is a huge hit with buyers, particularly homeowners, designers, and contractors. This is why various window manufacturers are streamlining this product to ensure design flexibility and long-lasting quality.
The window industry in 2025 continues to innovate, offering a wide range of custom design variations. In custom designs, you can get various standard windows, like French casement windows or bifold glass windows. So, below, we highlight the top 10 custom window manufacturers known for their exceptional custom windows.
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What makes a custom window manufacturer the best?
A custom window manufacturer stands out in the market not only for the quality or design of their products but also for a combination of factors. Among the characteristics of a custom window manufacturer is the use of high-quality materials because it directly impacts the appearance, longevity, and performance of the window. These materials will also contribute to how energy-efficient, cost-effective, and aesthetic the windows are.
A custom window manufacturer should further offer variations in their customization services, especially in the material, finishes, and sizes of windows. These customization services would precisely convert old types of windows to meet the needs of the buyers and their space. The custom window manufacturer should be an expert in craftsmanship. They will generally create windows that are well-fitted and perform as they intended.
Top 10 Custom Window Manufacturers in 2025
Here is the list of the top 10 custom window manufacturers based on their range of products, innovation, and reputation.
1. Andersen Windows & Doors
- Location: Bayport, Minnesota, USA
- Company Type: Manufacturing
- Year founded: 1903
- The number of employees: 10,000+
- Main Products: Windows, Luxury Windows, Window Replacement, Specialty Windows, and Doors
Andersen Windows & Doors has been one of the leading custom window manufacturers for over 120 years. This company has designed premium windows and doors for various markets, including residential, home improvement, and light commercial. Andersen based their work and production on principles of safety, quality, sustainability, and improvement. This reason makes their products attain a consistent quality.
Andersen is also known for offering a range of windows and doors. These products come in standard designs and structures that you can narrow down based on series, materials, and accessories. They also offer customization services where customers can design a window or door based on their liking.
2. Marvin Windows and Doors
- Location: Warroad, Minnesota, USA
- Company Type: Manufacturing
- Year founded: 1912
- The number of employees: 5,000-10,000
- Main Products: Windows, Doors, and Skylights
Marvin is a window and door manufacturer with over 110 years of experience. Since they first launched in 1912, this company has sought to improve people’s lives by offering quality and sustainable products. This is why their commitment to innovation, sustainability, and energy-efficient products earned them several awards.
In addition, Marvin is one of the leaders in the custom window market by providing the most detailed and artistic designs for all their windows and doors. All the sizes, designs, functionalities, and shapes of their products can be completely changed. Unlike other companies, Marvin offers a variety of window and door lines to allow you to choose which suits your space best.
3. Mannlee
- Location: Foshan, Guangdong, China
- Company Type: Manufacturing
- Year founded: 1998
- The number of employees: 300
- Main Products: Windows, Doors, and Energy-Efficient Products
Mannlee is among the best custom window manufacturers in 2025. Despite starting the company in 1998, Mannlee stands out in the industry by delivering quality and sustainable custom windows. The company focuses on improving innovative production lines to make custom doors suitable for every climate and consumer. With this, Mannlee has established a reputation for offering windows of high standards but reasonably priced.
Additionally, Mannlee satisfies both aesthetic and practical requirements. Their products exceed ENERGY STAR standards and offer various warranty options. Mannlee was able to achieve this position as they continued to innovate their modern factory and employ over 300 workers skilled in their field.
4. Jeld-Wen
- Location: Charlotte, North Carolina, USA
- Company Type: Manufacturing
- Year founded: 1960
- The number of employees: 10,000+
- Main Products: Windows, Doors, Trim, Panels, and Building Products
Founded in 1960, Jeld-Wen has expanded to become one of the world’s largest custom window manufacturers. Jeld-Wen distributes major doors, windows, and building products for various markets, such as residential and construction. This allows them to operate on a large scale to offer functionality and aesthetics. Jeld-Wen has grown to become a powerhouse in the window and door industry as they offer quality, sustainability, and energy efficiency.
In addition, Jeld-Wen offers customizations based on different materials, styles, and sizes, whether new or replacement windows. Their customers can get a wide range of window styles, including sliding, casement, and double-hung windows. Jeld-Wen also provides different upgrade options with their windows like adding Low-E insulating glass.
5. Kolbe Windows & Doors
- Location: Wausau, Wisconsin, USA
- Company Type: Manufacturing
- Year founded: 1946
- The number of employees: 1,000-5,000
- Main Products: Wood Windows, Aluminum Clad Windows, Vinyl Windows, Custom Windows, Folding Windows, and Doors
Kolbe Windows & Doors is known for its exceptional quality, craftsmanship, and attention to detail. Kolbe emerges as a pioneer in the window and doors industry. This company focuses on delivering high-quality, sustainable, and durable products that enhance the appearance and functionality of any space. These characteristics reflect their window and door solutions, as they offer an extensive product line that can be customized based on the client and space’s needs.
Kolbe also provides high-performing windows and doors that enhance the design of the space. Every project, whether residential or commercial, their products can be customized with various finishes, glass, colors, hardware, and other options. Some of their special products include custom windows, wood windows, patio doors, and more.
6. Simonton Windows & Doors
- Location: Cary, North Carolina, USA
- Company Type: Manufacturing
- Year founded: 1946
- The number of employees: 1,000-5,000
- Main Products: Vinyl Windows, Fiberglass Windows, Storm Windows, Patio Doors, and Doors
Since 1946, Simonton Windows & Doors has offered reasonably priced custom windows and doors. Simonton delivers their windows and doors to major markets in the United States and North America. This company contributes high-quality products that make homes and commercial spaces better. This is why they are known for their high level of customer service, as they guarantee through testing and design of products.
Simonton Windows & Doors has a wide range of products, but their specializations are replacement and vinyl windows. The company also sells products made of fiberglass or composite materials, so consumers can choose which suits their needs. Simonton truly established their brand over the years by concentrating on products that are reasonably priced and sustainable.
7. Weather Shield Windows & Doors
- Location: Medford, Wisconsin, USA
- Company Type: Manufacturing
- Year founded: 1955
- The number of employees: 1,000-5,000
- Main Products: Windows, Doors, Aluminum Windows and Doors, Wood Windows and Doors, Vinyl Windows, and Specialty Patio Doors
Weather Shield Windows & Doors is one of the top custom window manufacturers serving residential and commercial markets. This company has been in the business for 60 years, offering premium windows and doors. With their long history of craftsmanship and innovation, their customizable products can improve the appearance and functionality of homes and buildings.
Such qualities are possible for Weather Shield as they integrate cutting-edge manufacturing facilities to produce windows and doors that are energy-efficient and resilient to extreme weather. This makes Weather Shield windows an ideal option for consumers looking to buy premium quality in various materials and finishes like wood, fiberglass, and aluminum-clad.
8. Loewen Windows
- Location: Steinbach, Manitoba, Canada
- Company Type: Manufacturing
- Year founded: 1906
- The number of employees: 500-1,000
- Main Products: Awning Windows, Casement Windows, Single Hung/Double Hung Windows, and Doors
Loewen Windows is a Canadian-based company that manufactures premium and custom windows and doors. Founded in 1906, Loewen has established an excellent reputation for creating high-standard products. This company combines advanced design and technology with traditional workmanship. However, their products are priced higher because they use upscale wood materials, patterns, and craftsmanship. This is why they specialize in creating windows and doors for the luxury residential and commercial market.
Loewen is also known for their windows that can withstand harsh weather conditions like strong winds, storms, and cold. They offer these windows in various attachments, such as argon-insulated panes, storm-resistant glazings, energy-efficient low-E glass, and thermal spacer bars. With a combination of robust construction and design innovation, Loewen windows are unique in the market.
9. Feldco Windows
- Location: Des Plaines, Illinois
- Company Type: Manufacturing
- Year founded: 1976
- The number of employees: 200-500
- Main Products: Replacement Windows, Garage Doors, Vinyl Siding, Entry Doors, Patio Doors, Storm Doors, and Roofing
Feldco Windows is a leading provider of windows, siding, and doors in the Midwest. Founded in 1967, this company has since become a reputable manufacturer that focuses on the home renovation market. Feldco wants to provide its clients with quality home renovation products that enhance comfort, lower energy costs, and are aesthetically pleasing.
This is why their company is dedicated to producing energy-efficient and aesthetically pleasing windows that fit an affordable budget. This company also offers a broad range of options of features and styles for all their products to suit various home designs. They can provide a window into what their clients need as these options use different materials like vinyl, fiberglass, and steel.
10. ProVia
- Location: Sugarcreek, Ohio, USA
- Company Type: Manufacturing
- Year founded: 1977
- The number of employees: 1,000-5,000
- Main Products: Vinyl Windows, Wood Windows, Vinyl & Insulated Siding, Aluminum Storm Doors, Patio Doors, Aluminum Storm Windows, and Metal Roofing
ProVia is a leading custom window manufacturer because of its commitment to craftsmanship, energy efficiency, and customer satisfaction. This commitment is all reflected in the highest standard of products and services. Various experts across industries even attest to their exceptional capacity to produce a wide range of products. Some of their specialized products include windows, doors, and siding.
ProVia is also renowned for providing products that not only improve the appearance and structure of the space but also offer excellent security and performance. Each of their products, particularly the windows are crafted through strict manufacturing processes, advanced technology, and rigorous quality control.
Takeaways
These top custom window manufacturers provide various products with extensive customization services to suit the preferences, price ranges, and functional needs. These manufacturers offer different options to guarantee that your windows match the aesthetics and practicality of your space. Whether you’re looking for a kitchen bifold window, garden bay window, or plant window, custom window manufacturers should be your first option.
Mannlee is a growing leader in the custom window industry, offering an effective custom window solution. We have extensive experience to help your dream windows come to life!
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