When it comes to choosing windows for a residential or commercial project, the single casement window remains one of the most popular and practical options available. With its clean lines, excellent ventilation, and straightforward operation, a single casement window offers a timeless appeal that suits both modern and traditional architecture. Whether you are a builder, contractor, or property developer, understanding the key features of single casement windows — and knowing where to source them — can make a significant difference in your project's outcome.
A single casement window consists of one sash that is hinged on the side and opens outward (or inward, depending on the design) like a door. Unlike double-hung or sliding windows, a casement window uses a crank mechanism or a handle to open and close, providing a tight seal when shut. The single-panel design makes it ideal for smaller openings, bathrooms, kitchens, or as part of a larger window combination alongside fixed panels or twin casements.
The simplicity of a single casement window is also its greatest strength. With fewer moving parts than multi-panel configurations, it offers reliable long-term performance and easier maintenance. This window style is widely used in European, North American, and Middle Eastern markets, where both aesthetics and energy efficiency are top priorities.
Because the entire sash opens fully, a single casement window captures side breezes and directs fresh air into the room more effectively than sliding windows, which only open halfway. This makes them an excellent choice for spaces where airflow matters — kitchens, bathrooms, and living areas alike.
When closed, a casement window presses firmly against its frame, creating a tight seal that minimizes air leakage. Modern aluminum casement windows with thermal break technology can achieve impressive thermal performance, with K-values as low as 1.6 W/m²K. This translates to lower heating and cooling costs and a more comfortable indoor environment year-round.
A single casement window features a single sash with no central rail or mullion dividing the glass. This means you get a clear, uninterrupted view of the outdoors — a design advantage that architects and homeowners consistently value.
With a simple handle mechanism and side hinges, single casement windows are easy to open and close, even for elderly users. Cleaning is also straightforward — outward-opening designs allow you to clean the exterior glass from inside the room.
While casement windows are available in wood, vinyl, and uPVC, aluminum has emerged as the material of choice for high-performance projects. Here is why:
As a leading casement window manufacturer based in China, ALPES offers three premium single casement window models, each engineered with precision and built to meet international standards. All ALPES casement windows use 6060-T66 grade aluminum profiles with thicknesses of 1.8mm to 2.0mm, exceeding the new national standards for structural integrity.
C120 Outward Opening System Window
The C120 is ALPES's flagship single casement model, featuring a 119mm frame wall width and a 62mm glass sash. With a thermal K-value of 1.6, it delivers outstanding energy performance. The nail-free rolled press mesh structure ensures corrosion resistance and a flush, stable fit. Key highlights include ROTO transmission box hardware, anti-pry lock points, a fall-rope safety mechanism, and a full standard square cavity design for superior wind pressure resistance. Available with optional black high-definition anti-PM2.5 mesh.
C113 Outward-Open Window
The C113 features a 113mm frame width with a 57mm glass sash, built with 6060-T66 aluminum profiles. Its full glue-injection process creates a seamless monolithic structure, while the multi-chamber design provides warm-in-winter, cool-in-summer insulation. The triple sealing defense system blocks wind, rain, and noise. CMECH hardware — a German Red Dot Design Award winner tested for 30,000 cycles — comes standard. The glass centerline, thermal break strip, and equal-pressure sealing strip are aligned on the same axis for optimal performance.
C116 Outward-Open Window
The C116 is the slimmest option, with a 116mm frame wall width and an 81mm glass sash. Its oblique press line creates a slim 28mm visible frame for a sleek, modern look, while the 22mm slim medium mullion maximizes the field of vision. With a thermal K-value of 1.7, 34mm–44mm multi-chamber insulation strips, triple sealing with seamless welded corners, and an easy flat-channel drainage system, the C116 is ideal for projects where aesthetics and performance go hand in hand. Optional German Wehag hardware and 304 stainless steel high-load hinges are available.
| Feature | C120 | C113 | C116 |
|---|---|---|---|
| Frame Wall Width | 119mm | 113mm | 116mm |
| Glass Sash Thickness | 62mm | 57mm | 81mm |
| Thermal K-Value | 1.6 | — | 1.7 |
| Profile Thickness | 1.8–2.0mm | 1.8–2.0mm | 1.8–2.0mm |
| Hardware | ROTO | CMECH | Wehag (optional) |
| Best For | Maximum security & energy savings | Balanced performance & value | Sleek aesthetics & maximum glass area |
Selecting the right casement window manufacturer is critical to the success of your project. Here are the key factors to evaluate:
The best aluminum casement windows use 6060-T66 grade profiles — a high-precision alloy that offers excellent structural rigidity and resistance to deformation. Profile thickness should be at least 1.8mm to meet modern building standards. Always verify the material certification before placing an order.
The hardware is the heart of any casement window. Top manufacturers partner with globally recognized brands like ROTO, Winkhaus, CMECH, and Wehag from Germany. These brands bring decades of engineering expertise and have been tested for tens of thousands of operating cycles, ensuring your windows will function smoothly for years.
A 100,000 m² production facility with dedicated production centers indicates a manufacturer's ability to handle large-volume orders without compromising quality. Look for ISO-certified processes, advanced CNC machinery, and systematic quality inspection at every stage of production.
Every project is unique. A reliable manufacturer should offer custom sizes, color matching (including dual-color options), multiple glass configurations, and various mesh screen options — from standard stainless steel mesh to high-definition anti-PM2.5 mesh. The ability to customize ensures the windows integrate seamlessly with your architectural vision.
Manufacturers with proven export experience understand international building codes, packaging requirements, and logistics. ALPES, for instance, has successfully delivered projects to Saudi Arabia, Dubai, Australia, and across the Middle East, demonstrating the capability to meet diverse market requirements.
China has become the world's leading hub for aluminum window manufacturing, and for good reason. A china casement glass window factory like ALPES combines European engineering standards with direct-from-factory pricing, offering exceptional value for international buyers.
When sourcing from China, here are practical tips to ensure a smooth procurement process:
ALPES at a glance: With a 100,000 m² manufacturing base, two production centers in Foshan and Zhaoqing (Guangdong, China), and partnerships with German hardware giants like ROTO, Winkhaus, and Wehag, ALPES delivers custom aluminum windows and doors that meet the demands of luxury residential and commercial projects worldwide. Learn more at www.alpeswindow.com.
ALPES single casement windows are available in four standard color finishes, with custom color matching available upon request:
Dual-color finishes are also available — for example, a white interior to match your indoor decor and a dark gray exterior for a striking facade.
Proper installation is essential to realizing the full performance benefits of single casement windows. Here are a few practical points to keep in mind:
Whether you are working on a luxury villa in the Middle East, a modern apartment complex in Australia, or a commercial development in North America, ALPES has the expertise and manufacturing capability to deliver custom aluminum casement windows that meet your exact specifications. With competitive factory-direct pricing, German-engineered hardware, and a proven track record of global exports, ALPES is your trusted partner for high-performance windows and doors.
Contact ALPES today: Email jennifer@alpesvip.com or reach out via WhatsApp at +86 18200804101 to discuss your project requirements and request a quotation. Visit www.alpeswindow.com to explore the full product range.
