WINDOWS AND DOORS
Luxury aluminium glazing, engineered for comfort and architectural refinement.
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SiON Windows & Doors represent the perfect balance between design, performance, and durability. Crafted from premium aluminium and engineered for modern South African conditions, our glazing systems deliver clean sightlines, reliable security, and long-term performance. Whether you’re building a high-end home, delivering a premium development, or specifying a commercial space with architectural intent, SiON provides the clarity and guidance needed to select the right system from the start.
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Aesthetics
SiON profiles are sleek, refined, and deliberately minimal. Every detail is designed to create clean architectural lines and a premium finish, allowing the glazing to elevate the design without visual clutter.
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Performance
Our glazing systems are engineered as complete performance solutions. With double glazing options, tailored glass specifications, and thermally broken frame technology, SiON improves year-round comfort by reducing heat gain in summer, limiting heat loss in winter, and enhancing acoustic insulation for quieter living and working environments.
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Security & Durability
SiON systems are built for longevity and peace of mind. Premium aluminium construction, durable finishes, and advanced locking options deliver structural integrity and security, designed to withstand daily use and the demands of high-end projects.
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Flexibility in Design
Modern architecture demands large openings, uninterrupted views, and seamless indoor–outdoor flow. SiON systems support expansive glass panels and bespoke configurations, giving architects and homeowners the flexibility to achieve bold design intent without compromising performance or reliability
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Why Choose SiON
Because premium glazing shouldn’t be confusing. SiON brings architectural clarity to performance specification, helping you choose the right solution the first time, with confidence in design, comfort, durability, and long-term value.
Fold-Stacking
Fold-Stacking
Designed for openness and flexibility, SiON fold-stacking doors create uninterrupted views and effortless indoor–outdoor living. With slim frames, expansive glass panels, and precision track systems, they deliver smooth operation and a refined architectural finish
Sliders
SiON sliders maximise natural light and openness with clean sightlines and smooth daily operation. Durable aluminium construction, secure locking options, and flush threshold integration deliver a premium, practical solution for modern living.
Tilt-Turn
Inspired by European performance design, SiON tilt-turn windows offer secure ventilation, full opening functionality, and excellent insulation performance, combining everyday convenience with refined architectural detailing.
Tilt - Drift
Unique to the South African context, SiON Tilt & Drift windows offer a smarter approach to ventilation and access. The sash can tilt open for secure airflow, or slide horizontally for a full opening when needed.
This hybrid design combines European-inspired engineering with local practicality, delivering smooth operation, durability, and everyday comfort. ​
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Combinations
The SiON Advanced Glazing System is more than just a set of aluminium windows and doors — it’s a modular, adaptable system designed to give architects, builders, and clients complete freedom of choice. By combining elements such as tilt-turn windows with sliding or fold-stacking door systems, the range allows for endless variations and unique solutions.​
​​Flexibility in Design
Our system is engineered to integrate seamlessly, meaning tilt-turn elements can be incorporated into larger sliding or folding applications. This opens up creative possibilities whether it’s maximising light and views, improving ventilation, or creating striking architectural features.
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Possibilities Without Limits
Because the system is built on a versatile framework, almost any combination is possible. Large expanses of glazing, bespoke configurations, or tailored details can be achieved without compromising on performance, security, or aesthetics.
Collaborative Solutions
At SiON, we don’t just supply products — we work with you to explore the best options for your project. By engaging with us early in the process, we can help uncover creative solutions that balance functionality, design intent, and budget. Together, we turn architectural possibilities into practical realities.
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Frames and Glass
At SiON, glass is as important as the frame. That’s why we supply performance glazing systems that are engineered and specified with intention. Our double-glazed options deliver exceptional thermal insulation for improved comfort and energy efficiency, while also providing acoustic insulation for quieter interiors, particularly valuable in urban environments. Combined with thermally broken aluminium frames, SiON glazing becomes a true performance system that elevates daily living and long-term value
Adaptable Glazing, Expertly Specified
Every project is unique and so are its glazing requirements. The SiON Advanced Glazing System is fully adaptable to suit any application, from residential homes to high-performance commercial buildings.
With our expert guidance, we help you select and specify the best-performing glass for your needs, balancing factors such as glass thickness, spacer configuration, and Low-E coatings to achieve optimal insulation, clarity, and comfort.
Whether your priority is energy efficiency, solar control, or acoustic performance, SiON ensures your glazing system is precisely tailored to the demands of your space, delivering superior results without compromise.
Thermal Break Technology
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Thermally broken aluminium frames are a key element of high-performance glazing systems. By separating the inner and outer aluminium profiles with an insulating barrier, heat transfer is dramatically reduced, keeping interiors warmer in winter and cooler in summer. This technology not only improves energy efficiency but also enhances comfort and condensation control, making it an essential feature in modern architectural design.
Glazing System | Specification | Light Transmittance % | Light Reflectance % | Energy Transmittance % | Energy Reflectance % | SHGC | U Value (W/m2*K) | Accoustics Rw (db) |
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SiON PERFORMANCE GLASS | 6 grey tint-12-6, Argon, Low E | 57 | 11 | 37 | 31 | 0.45 | 1.5 | 33 |
STANDARD CLEAR | 6-12-6, Argon, Low E | 77 | 15 | 49 | 32 | 0.57 | 1.5 | 33 |
LIGHT BLOCK GLASS | Reflect film-6 blue tint-12-6, Argon, Low E | 17 | 54 | 11 | 41 | 0.15 | 1.5 | 33 |
HIGH PERFORMANCE GLASS | 6 blue tint-12-6, Argon, Low E | 48 | 9 | 27 | 10 | 0.34 | 1.5 | 33 |
Glazing Performance
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SION provides high-performance glass for every glazing application, combining advanced coatings and specifications to deliver exceptional comfort and efficiency. Our range includes Low-E, solar control, and high clarity options, optimised for thermal insulation, light transmission, and solar heat gain control (SHGC). Each system is engineered to meet the highest standards of performance and aesthetics for contemporary architecture.
Why It Matters
In Southern Africa, glazing is one of the most overlooked contributors to comfort and energy efficiency. Even when roofs and walls are insulated, poorly specified windows and doors allow significant heat gain in summer and heat loss in winter.
High-performance double glazing paired with thermally broken aluminium frames forms an insulation barrier, helping homes stay cooler in summer, warmer in winter, and noticeably quieter throughout the year.
A well-insulated home retains heat in the winter and stays cool in the summer.
Single-glazing is not an effective insulator, resulting in heat loss in the winter and heat gain in the summer.
Single-glazed windows are our homes' weak point, and it is often overestimated how much of a difference having a well-insulated home makes.
Well-insulated homes are 40-50% more energy efficient, saving money on heating and cooling over time.
Double glazing with thermally broken aluminium frames forms an insulation barrier, preventing heat flow into and out of the home.
Double glazing not only insulates your home from heat, but it also acts as a sound barrier, which improves home comfort, particularly in cities.
SiON's double-glazed systems are elegant and are the pinnacle of the modern insulated home.