Sash windows have been a hallmark of multiple architectural buildings, particularly in British architecture. This window type integrates modern and timeless architecture, making it a popular window option in 2025. This window, whether made of uPVC or wood, has the perfect ratio of functionality and aesthetics.
In this comprehensive guide, we’ll highlight the top 10 sash window manufacturers of 2025 that set the standard for quality, design, and sustainability. Whether you’re renovating or remodeling, these manufacturers offer a broad range of windows that suit your needs!
Contents
What makes a sash window manufacturer the best?
There are hundreds of top window manufacturers in 2025 competing to provide the market with innovative and customized products. In choosing the best sash window manufacturer, you have to consider their craftsmanship, material quality, customer services, and overall product performance. The first one is craftsmanship, which encompasses design and innovation. These manufacturers should maintain the classic features and innovative style of sash windows, such as sliding sash windows or vertical sliding sash windows.
In addition, the best sash window manufacturer should use high-quality materials in their production process. Some materials they should provide are timber, aluminum, or windows, known for being durable. The best manufacturer should also provide excellent customer service by being accommodating to their clients. However, the most important quality of the best manufacturer is the overall product performance. Their windows should slide smoothly and contain durable sash cords or spring balances.
Top 10 Sash Window Manufacturers in 2025
The following are the top ten sash window manufacturers you should check out.
1. Sash Window Workshop
- Location: Bracknell, Berkshire, England
- Company Type: Manufacturing
- Year founded: 1944
- The number of employees: 50-200
- Main Products: Timber Windows, Bespoke Windows, Sash Windows, Traditional Windows, Sliding Sash Windows, and Doors
Sash Window Workshop is a multi-award-winning company established in 1944. This company has over 30 years of experience in the window and door industry, providing high-quality products and services. Sash Window Workshop also focuses on providing product solutions for residential and commercial spaces. This allows them to work closely with builders, architects, and homeowners.
Sash Window Workshop specializes in designing, producing, and installing premium timber sash windows. They designed their products to complement the architectural structure of the space while improving energy efficiency. They also offer a broad range of window types, such as classic single-hung sash, double-hung sash, and sash windows with contemporary energy-efficient features.
2. Mannlee
- Location: Foshan, Guangdong, China
- Company Type: Manufacturing
- Year founded: 1998
- The number of employees: 300
- Main Products: Sash Windows, Doors, and Energy-Efficient Products
Mannlee is one of the best sash window manufacturers in Guangzhou, China. This company is renowned for its dedication to fine craftsmanship, energy efficiency, and innovation. For over 2 decades, they have continuously improved their products and production. These improvements allow them to provide windows and doors that contain aesthetic and functional features.
Mannlee always delivers exceptional products and service. They have a wide range of innovative windows and doors, from commercial windows to sliding sash windows. Mannlee also takes pride in excellent customer service, guaranteeing that all their products meet the highest standards.
3. NorDan
- Location: Livingston, West Lothian, Scotland
- Company Type: Manufacturing
- Year founded: 1981
- The number of employees: 50-200
- Main Products: Timber Windows and Doors, Aluminum-Clad Timber Windows and Doors, and Low-Embodied Carbon Products
NorDan is a family-owned business that offers windows, doors, and smart accessories across Europe. With over 2200 workers, 12 factories, and 35 project management offices, NorDan continues to rise in the window and door industry. NorDan has a lot to offer in the industry and consumers, particularly its commitment to sustainability and innovation.
With timber as their core material, NorDan provides window and door solutions that maximize the energy efficiency and functionality of the space. One of the main advantages of their product lines is attaining low carbon values. These values are then reflected in their products: multi-sash, aluminum-clad timber windows, and more.
4. Anglian Home Improvements
- Location: Norwich, England
- Company Type: Manufacturing
- Year founded: 1966
- The number of employees: 1,000-5,000
- Main Products: Sash Windows, Timber Windows, Conservatory Windows and Doors, and Doors
With more than 50 years of experience, Anglian Home Improvements is one of the leading sash window manufacturers in the UK. This company provided the market with products for the residential market, particularly premium windows, doors, conservatories, and home remodeling solutions. Since its founding in 1966, Anglian Home Improvements has built a reputation for providing dependable, quality, and visually appealing products.
In addition, Anglian Home Improvements specializes in sash windows. Their sash windows come in both traditional timber materials and timber-effect uPVC. Anglian’s sash windows are popular in the industry for their low maintenance qualities and energy-efficient criteria. Along with its other products, it is durable, long-lasting, and secure, with multi-point locking systems.
5. Everest Windows and Doors Inc.
- Location: Toronto, Ontario, Canada
- Company Type: Manufacturing
- Year founded: 2010
- The number of employees: 2-10
- Main Products: Sash Windows, uPVC Windows, Hung Windows, Black Windows, Custom Doors, and Custom Windows
Everest is one of the most well-known window manufacturers in Canada. This company started in 2010 and has rapidly risen to provide premium products, excellent customer service, and innovation. At the core of their company is their dedication to producing and installing high-quality windows, doors, and other home renovation items. Some products they offer are sash windows, casement windows, and UPVC doors.
Everest window and door products are an excellent option for residential areas as they integrate innovative design and energy efficiency. Beyond these products are comprehensive services that focus on design, consultation, and installation. Their commitment to quality and customer service is why their products perform at their best.
6. Trimline Windows Incorporated
- Location: Ivyland, Pennsylvania, USA
- Company Type: Manufacturing
- Year founded: 1966
- The number of employees: 50-200
- Main Products: Double Hung, Casement, Bow, Bay, Awning, Picture Windows, and Sash Replacement Kits
Trimline Windows Incorporated offers high-quality windows for various markets, including replacement, remodeling, new construction, and historically certified rehabilitation projects. For over 20 years, this company has provided a broad range of products, such as round tops, ellipses, and other architectural window products. They also have standard windows like double hung, casement, bow, bay, awning, picture windows, and sash replacement kits.
Trimline Windows product variations were made possible because they employ state-of-the-art facilities. With a commitment to quality and innovation, Trilime’s extensive product offerings cater to the specific needs of its clients. This is why, aside from their standard products, they also offer customization services.
7. Strafford Window Manufacturing Inc.
- Location: Stafford, New Hampshire, USA
- Company Type: Manufacturing
- Year founded: 1993
- The number of employees: 2-10
- Main Products: Sash Windows and Transom Windows
Founded in 1993, Strafford Window Manufacturing is one of the best sash window manufacturers. Strafford Window Manufacturing is a family-owned business, specializing in manufacturing custom transom, sash, hopper, and single-hung windows for barns, stables, and sheds. These products are available in custom orders that consumers can purchase in different numbers. This company strives to provide high-quality products while emphasizing customer service.
In addition, Strafford Window Manufacturing has invested in automation and cutting-edge equipment to ensure accurate production of every custom sash order. This is why their company has grown steadily, which allows them to produce about 5,000 custom windows and sell more than 350,000 windows.
8. The Sash Window Company
- Location: London, London
- Company Type: Manufacturing
- Year founded: 2007
- The number of employees: 2-10
- Main Products: Traditional Timber Sash Windows, French Doors, Front Doors, Timber Windows, Timber Doors, and French Windows
The Sash Window Company was established by Henry Coles in 2007. This company operates in London and creates custom timber sash windows and doors. All of these windows and doors are skillfully crafted by using high-quality materials, contain sound and draught protection, and are designed aesthetically. This is why their products can improve the functionality and architectural character of the space.
The Sash Window Company provides a complete sash window solution, including design, production, and installation. Their factory in South London is responsible for producing all their products. This enables them to offer sash windows with a fast turnaround time and a high standard of customer service.
9. Accoya
- Location: London, UK
- Company Type: Manufacturing
- Year founded: 2007
- The number of employees: 200-500
- Main Products: Accoya Wood, Timber, Windows, and Doors
Accoya is among the top window and door manufacturers based in the UK. Since its launch in 2007, Accoya has been a preferred manufacturer for various homes and buildings. This is because Accorya offers high-quality materials for all their windows, doors, decking, and siding products. All of its products are also made at its manufacturing plant in Arnhem, in the Netherlands, ensuring that they are of high quality and sustainable.
Accoya is reputable in the window and door industry for its exceptional products and services that show longevity in residential and commercial settings. The outcomes of such a reputation are reflected in all of their products and services. Accoya attracts consumers and design experts for this reason.
10. Eco Sash & Case
- Location: Edinburgh, Scotland
- Company Type: Manufacturing
- Year founded: 2018
- The number of employees: 2-10
- Main Products: Sash Window Repairs, Sash and Case Windows, and Doors
Eco Sash & Case is a family-owned business specializing in repairing, renovating, and manufacturing sash and case windows and casement windows. This company contains skilled workers and cutting-edge technology to create quality and sustainable products. This company is also committed to being environmentally friendly, so they source sustainable timber and add draught-proofing to the windows.
Over the years, Eco Sash & Case has molded its experience to renovating and updating traditional sash and case and casement windows. This is why they replace and restore historic sash windows using more ecologically friendly methods and supplies. With Eco Sash & Case, window products, repair, and installation services are all made economical, environmentally friendly, and sustainable.
Conclusion
The sash window manufacturing industry in 2025 offers diverse options to cater to various needs. You can find sash windows in traditional styles like sliding sash windows or a more elevated one. Because of this diversity, some manufacturers, like Anglian Home Improvements and Everest, offer alternatives like uPVC and composite sash windows. Whereas, Sash Window Company and The Sash Window Workshop continue to uphold high levels of traditional craftsmanship.
Choosing the best window manufacturer is crucial when buying sash windows. Mannlee is one of the best window manufacturers that offer sash windows that meet a high standard. Check our product option now.
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