Casement windows provide optimal ventilation, remarkable views, and great light flow. They are equally popular for the picturesque beauty they add to the exterior facade and interior decor of a home.
However, a quick search also reveals that casement windows are not made equal. Investing in low-quality or poorly designed ones can limit these benefits or cause you to end up with inefficient, unreliable windows.
Allow us to save you from such a fate. Here is a detailed review of top casement window manufacturers that can deliver quality, professionally designed casement windows for different types of projects.
The Best Casement Window Manufacturers for 2025
Before we dive into the review, here is a quick comparative summary of the locations of the different manufacturers, their certifications, and other key details.
| Manufacturer | Location | Main Products | Certifications | Website |
| Sun Windows & Doors | Owensboro, Kentucky, USA | Windows Doors | NFRC | https://sunwindows.com/index.html |
| Gilkey Window Company | Cincinnati, Ohio, USA | Windows Doors | N/A | https://www.gilkey.com/ |
| Hotian | Hefei, Anhui, China | Custom windows Doors | NAMINFRC | https://hotianwindows.com/ |
| Sierra Pacific Window | Red Bluff, California, USA | Windors Doors | WDMA Hallmark Certification | https://www.sierrapacificwindows.com/ |
| Hope’s Windows | Jamestown, Newyork, USA | Windows Doors Specialty windows and doors | NFRC | https://hopeswindows.com/ |
| Paradigm Windows | Portland, Maine, USA | Windows | Energy Star® | https://paradigmwindows.com/ |
| Everest | Liberator Road, Norwich, UK | Windows Doors | BSIFENSA | https://www.everest.co.uk/ |
| Huke | Cradock Road, Luton, UK | Glass Windows Doors | N/A | https://hukeltd.co.uk/ |
| Emplas | Wellinborough, UK | Windows Doors | BFRC | https://emplas.co.uk/ |
| Wandsworth Sash Windows | Kangley Ridge Road, London, UK | Windows Shutters Doors Joinery | CERTASS | https://sashwindows.london/ |
| John Fredericks | Huddersfield, UK | Windows Doors | BSI | https://www.johnfredericks.co.uk/ |
| Eurostyl | Chelmek, Poland | Windows Doors | N/A | https://eurostyl.net.pl/en |
| Drutex | Bytow, Poland | Windows | TÜV SÜD Management Service GmbH | https://www.drutex.com/en-us/ |
| Sosnowicz | Olsztyn, Poland | Windows Doors Glazing | CE | https://sosnowicz.pl/en/ |
| Metra Building | Brescia, Italy | Windows Doors | POSA CLIMALloyd’s Register | https://www.metrabuilding.com/en/ |
Sun Windows & Doors
Location: Owensboro, Kentucky, USA
Company Type: Manufacturing
Year founded: 1930
Main Products:
- Windows
- Doors
Website: https://sunwindows.com/index.html
Sun Windows & Doors manufactures casement windows for residential and light commercial buildings. It offers solutions for new construction projects, renovations, and window replacement projects.
Its casement windows are available in 3 different design collections curated for various preferences. They mostly vary based on their construction materials.
- Clad Wood Collection – aluminum exterior, wooden interior
- Clad Vinyl Collection – aluminum exterior, vinyl interior.
- Series 2020 Vinyl – vinyl interior and exterior
All collections are fitted with Low-E glass, have Argon-filled airspace, and provide complete weather seal protection.
Gilkey Window Company
Location: Cincinnati, Ohio, USA
Company Type: Manufacturing
Year founded: 1978
Main Products:
- Windows
- Doors
Website: https://www.gilkey.com/
The Gilkey Window Company specializes in window replacement projects for residential properties. It currently offers two distinct series of casement windows to choose from.
The fiberglass series comprises casement windows with a minimalist design that delivers stunning, unobstructed views. They are kitted with heavy-duty stainless steel hinges, which facilitate smooth operation and guarantee superior durability.
If you prefer more charming traditional casement windows, the Boreal vinyl series may be more ideal. It has soft, slim profiles and a honeycomb frame. Its sashes, frame, and hardware are handpicked and designed to ensure top energy efficiency.
Hotian
Location: Hefei, Anhui, China
Company Type: Manufacturer
Year founded: 2015
Main Products:
- All window types
- Doors
Website: https://hotianwindows.com/
Hotian provides comprehensive casement window solutions. The company specializes in designing and manufacturing custom casement windows for all types of projects.
The customization process is simple and efficient. The Hotian team consults with you to establish key details, such as the best size, colors, materials, and design specifications for the casement windows you require. The designers then develop designs based on these specifications and hand them over to the factory team for production.
Hotian manufactures custom casement windows using premium vinyl, aluminum, wood, or combinations of these materials. Each window design is optimized to deliver top-tier energy efficiency, security, and flawless functionality. However, the Hotian factory is adequately equipped to customize any casement window design with superior features such as:
- Higher energy efficiency window glass/glazing
- Soundproofing
- Unique opening angles
- Weatherproofing
This custom casement window manufacturer has low MOQs, short lead times, and they work with clients across the globe.
Sierra Pacific Window
Location: Red Bluff, California, USA
Company Type: Manufacturer
Year founded: 1969
Main Products:
- Windows
- Doors
- Wall systems
Website: https://www.sierrapacificwindows.com/
Sierra Pacific Window may fit your requirements if you are looking for casement windows for residential or light commercial projects. It has an impressive network of 600 dealers and 5 manufacturing plants across different regions.
The company manufactures:
- All wood casement windows
- Aluminum-clad wood casement windows
- Vinyl casement windows
- Fusion Tech Casement – an integration of extruded aluminum, vinyl, and wood casement windows
The aluminum components are powder-coated for durability and to achieve better-quality aesthetic finishes. The firm also offers a variety of window colors, texture finishes, opening mechanisms, and glazing options.
Hope’s Windows
Location: Jamestown, Newyork, USA
Company Type: Manufacturer
Year founded: 1912
Main Products:
- Windows
- Doors
- Specialty windows and doors
Website: https://hopeswindows.com/
Hope’s Windows stands out for multiple reasons. First, it manufactures solid steel and bronze casement windows. These materials are unique compared to aluminum, wood, or vinyl, which are more preferred among window manufacturers.
It manufactures casement windows for residential, replacement, and commercial properties. The company’s history also dates back more than a century. This gives it the distinct advantage of being able to craft historic/antique-style casement windows with modern features such as higher energy efficiency, better hinges, sashes, crankshafts, and glazing.
Paradigm Windows
Location: Portland. Maine, USA
Company Type: Manufacturer
Year founded: 1981
Main Products:
- Casement windows
- Awning windows
- Hopper windows
- Specialty shape windows
Website: https://paradigmwindows.com/
Paradigm Windows manufactures easy-maintenance casement windows for new constructions and replacement projects. Its windows are Energy Star® rated, and the company prides itself on applying key features that elevate the quality and functionality of its windows. The features include:
- 3 continuous weather seals on each window
- Multi-point locking systems
- Ergonomic crank handles that are easy to tuck away
The company provides a variety of customization options. They include different window grid options, glass/fill options, colors, lock varieties, and exterior window casing options. Each window has a lifetime material warranty and a 5-year labour warranty.
Everest
Location: Liberator Road, Norwich, UK
Company Type: Manufacturer
Year founded: 1965
Main Products:
- Windows
- Doors
- Conservatories
Website: https://www.everest.co.uk/
Everest delivers great aesthetics, quality materials, and functionality in remarkable ways. It manufactures vinyl, wood, and aluminum casement windows in a variety of brilliant designs. These materials are uniquely processed to ensure high performance and durability. The wood, for example, is laminated, while the aluminum is powder-coated.
The casement windows are customizable to suit different needs. The Everest team can tailor them to open in specific angles or directions or finish them in your preferred colors, among other options. The company also offers double and triple-glazing options, which deliver high levels of energy efficiency.
Huke
Location: Cradock Road, Luton, UK
Company Type: Manufacturer
Year founded: 2013
Main Products:
- Glass
- Windows
- Doors
Website: https://hukeltd.co.uk/
If you run a window or building supplies business, Huke is right up your alley. It manufactures and supplies casement windows to traders wholesale. While it does not style itself as a custom manufacturer, it strives to deliver the different types of casement windows that traders may require.
The company specializes in aluminum casement windows. It sources high-quality aluminum window profiles from top brands, like Cortizo and Smart Windows. This enables Huke to provide a wide variety of casement window designs. They range from slim profiles with maximum views to designs with safety-oriented sashes and frames.
Emplas
Location:
Company Type: Manufacturer
Year founded: 1979
Main Products:
- Windows
- Doors
Website: https://emplas.co.uk/
Emplas also fabricates and supplies casement windows through trading partners. It sets itself apart by offering a vast range of vinyl and aluminum casement window options. The core design options include:
- Fully sculptured casement windows
- Flush finish casement windows
- Chamfered casement window options
Each of these window styles is available in side-hung or top-hung designs, with double or triple glazing. They are further customizable in different colors, finishes, sizes, locking systems, and other features.
Notably, Emplas sources some window parts from leading profile and security system manufacturers. All its vinyl windows, for example, are manufactured with advanced locking systems and smart sensors. The smart features are particularly advantageous as they allow homeowners to monitor their home security even remotely.
Wandsworth Sash Windows (WSW)
Location: Kangley Ridge Road, London, UK
Company Type: Manufacturer
Year founded: 2012
Main Products:
- Windows
- Shutters
- Doors
- Joinery
Website: https://sashwindows.london/
Contrary to its name, WSW does not only offer sash windows. It also manufactures one-of-a-kind wooden casement windows. This statement applies in two ways. First, because it only produces custom casement windows, and secondly, because its craftsmen create each unit by hand.
The WSW designers can create both modern and period-style casement window designs. They are customizable in a variety of colors, sizes, or layouts, and can hang from a side or top hinge. WSW additionally offers quality glazing options that customers can select to make their windows more energy-efficient.
All the wooden components of WSW casement windows are hardy and durable. They are crafted from Scandinavian redwood, dried in kilns, and sealed for extra protection, where necessary.
John Fredericks
Location: Lindley Moor Road, Huddersfield, UK
Company Type: Manufacturer
Year Founded: 1970
Main Products:
- Windows
- Doors
Website: https://www.johnfredericks.co.uk/
John Fredericks makes selecting your ideal casement windows fairly easy. It offers two main types of casement frames: sculptured and chamfered. Once clients choose between the two, they can customize the rest of their casement window design by selecting their preferred:
- Color
- Finish
- Handle design
- Locking systems
- Decorative features, e.g,. Georgian bars
All John Frederick windows meet the basic regulatory threshold for energy efficiency in the UK, set at a U-value of 1.4 W/m²K or Window Energy Rating ‘B’. They are ideal for budget or replacement projects. However, the company offers window options that deliver higher ratings for customers who prefer them.
Eurostyl
Location: Chelmek, Poland
Company Type: Manufacturer
Year Established: 1999
Main Products:
- Windows
- Doors
Website: https://eurostyl.net.pl/en
Eurostyl caters to conventional and unique needs in the European window industry. It produces windows for new builds, renovations, and even building restoration projects. Its core specialty is woodwork. It thus manufactures a vast selection of casement windows by:
- Outsourcing window profiles and glazing from top brands
- Producing the wooden frames and sashes in-house
- Assembling the windows
This collaborative approach enables Eurostyl to offer various customization options, such as different hinge types, handles, and window opening styles. Clients can additionally choose between internal and external double glazing, as well as different types of wood and surface coatings.
Drutex
Location: Bytow, Poland
Company Type: Manufacturer
Year Established: 1985
Main Products:
- Windows
Website: https://www.drutex.com/en-us/
Drutex couples decades of experience and modern window design solutions to create top-notch windows. Its product catalog comprises aluminum, PVC, wooden, and wood-aluminum window options. The options are classified based on these materials, but they each have unique:
- Sound insulation levels
- Profile design
- Thermal transmittance
- Number of chambers
- Number of weather protection rubber seals
Drutex casement windows have highly refined finishes and stunning modern designs. They are available in numerous configurations catering to different design preferences, architectural styles, and budgets. The company further provides a wide selection of colors, glass, and frame designs to choose from.
Sosnowicz
Location: Olstyzn, Poland
Company Type: Manufacturer
Year founded: 1982
Main Products:
- Windows
- Doors
- Glazing
Website: https://sosnowicz.pl/en/
Sosnowicz has decades of experience in wood crafting. Its staff now employs these skills to manufacture energy-efficient wooden and wooden-aluminum casement windows. It classifies these window varieties into 2 key options:
- Single-glazed frame – it offers basic protections and good functionality
- External multi-glazed frame – ideal for higher energy efficiency and sound insulation
The casement window designs from this manufacturer strike a balance between functionality and architectural beauty. Frames like the Zero system, for example, fully hide the window sash to create a neat, minimalist design with outstanding window views. Its Termoscudo Easy-Fiat frame, on the other hand, is impressively compact. It keeps multi-glazing casement windows slim and appealing, as opposed to bulky and inconvenient.
Metra Building
Location: Brescia, Italy
Company Type: Manufacturer
Year founded: 1960s
Main Products:
- Windows
- Doors
- Niche building solutions
Website: https://www.metrabuilding.com/en/
Metra Building has a proven track record as a window manufacturer for residential and commercial properties across continents. It manufactures high-performance aluminum casement windows.
The high-performance features range from burglar-proof closures and soundproofing to energy-efficient glazing, among other options. The company offers different casement window collections with unique combinations of these features. Customers can, therefore, select a suitable design based on the features they most prefer.
Conclusion
The manufacturers on this list prove that you can find quality casement windows across different regions for any type of project. Choosing a reputable manufacturer also gives you the advantage of selecting the right window features and design details for your needs and budget.
At Hotian, no project is too big and no design detail is too small. We prioritize our clients’ requirements down to the last detail to ensure you get the perfect casement windows for your projects. We have the expertise and production capabilities to meet all your requirements. Ready to start your project? Contact us for a free quote or a consultation.
