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Custom, slim-frame, internal and external, steel-framed and frameless sliding glazing systems, for bespoke residential and commercial projects.
Large expanses of glass are a popular feature of modern architectural design thanks to their ability to bring in natural light, visually connect indoor and outdoor spaces, and create a sleek, minimalist, and welcoming aesthetic.
At KCC Group, we offer our clients leading brands of super slimline steel and aluminium window and door systems including MHB, Schuco Jansen, and Sky-Frame. These specialist glazing and wall systems offer superior thermal performance, sound insulation, fire resistance, strength, durability, and minimal sightlines.
Our in-house glazing specialists work with you from initial design stage all the way through to on-site installation and ongoing maintenance to deliver specialist slim-frame steel or frameless sliding aluminium systems that meet your specific criteria and specifications.
World’s slimmest steel profile systems for commercial & residential applications – minimal sightlines, stunning aesthetics and functionality.
Experience a flush & seemingly invisible transition between indoors & outdoors with Sky-Frame frameless sliding systems.
Our Glazed Fire Screens and Doors help to contain the spread of fire, improve visibility, and allow for the flow of natural light through a building.
As an architect or designer you might choose slim steel-framed glazing or frameless sliding windows for your project to achieve a modern, minimalist aesthetic while maximising natural light and views. These systems offer a sleek, unobtrusive appearance that can seamlessly integrate indoor and outdoor spaces, enhancing the visual and functional appeal of a building. The slim profiles or frameless designs not only provide structural strength and durability but also allow for greater design flexibility and creative expression, making them ideal for contemporary residential and commercial projects seeking both elegance and efficiency.
Thermal Efficiency: Patented 30mm thermally broken solid steel profiles improve energy efficiency by incorporating a thermal break, a non-conductive material placed between the interior and exterior steel frames which minimizes the transfer of heat and cold through the window frame, significantly reducing heat loss in the winter and heat gain in the summer
Design Freedom & Versatility: Our steel systems are suitable for both interior and exterior applications in both curved and straight-edged configurations. Steel’s versatility in design enables architects to create customized and unique window configurations, fitting various architectural styles from industrial to contemporary. Glass can also be translucent or opaque or fluted to allow use in different settings.
Strength and Durability: Steel-framed windows are a strong and durable choice due to the inherent properties of steel. Steel offers exceptional structural integrity and can support larger panes of glass with slimmer profiles compared to other materials. This allows for expansive window designs without compromising strength or stability. Additionally, steel is highly resistant to environmental factors such as extreme weather, UV radiation, and corrosion, ensuring longevity and reduced maintenance. Its robust nature makes steel-framed windows ideal for both security and aesthetic purposes in architectural projects.
Aesthetic Appeal: Steel-framed windows are an excellent aesthetic choice due to their slim profiles and clean lines, which provide a sleek and modern look. The material’s inherent strength also allows for minimalistic frames without compromising structural integrity, contributing to a refined and sophisticated appearance.
These features combine to empower architects and designers to create bold architectural statements that are also energy-efficient, functional, and beneficial to the occupants’ well-being.


Frameless Design & customisation: Options for single, double, and triple glazing, curved and sloped designs, and various colours.
Technology Integration: Includes solar shading, insect screens, electric drives, and enhanced security features.
Aesthetic Flexibility: Allows for creative architectural designs with ceiling-height windows and fully retractable glass panels. Provides a sleek, modern look with uninterrupted views, merging indoor and outdoor spaces seamlessly.
Swiss Engineering: Ensures high precision for seamless functionality, exceptional quality for superior performance, and long-lasting durability for peace of mind and long-term satisfaction.


The use of slim-frame steel glazing systems throughout the interior of a building maximises natural light, creating a bright, open, modern and elegant aesthetic. The durability of these steel systems allow for the slimmest profiles on the market, 30mm, allowing for maximum glazed panels where desired, or multiple mullions for a more industrial aesthetic. Some key features of internal steel framed windows and doors are their acoustic performance, their fire and smoke resistance abilities and their fall protection capabilities.

For clients requiring external slim-frame steel glazing systems we can offer systems from leading manufacturers that are characterized by their sleek profiles that maximize the glass area while maintaining structural integrity and weather resistance. Some key features of these exterior steel glazing systems include high thermal insulation properties, customizable design options, and compatibility with various glass types for different aesthetic and performance requirements providing durability, aesthetic appeal, and energy efficiency in external glazed applications.

Designed to enhance spatial connectivity and maximize views, Sky-Frame doors are characterized by their minimalistic frames and large glass panels that create a seemingly invisible transition between indoor and outdoor spaces. The system allows for flexibility in design, accommodating various architectural styles and configurations, from residential homes to commercial buildings. Its engineering ensures superior performance in terms of insulation, weather resistance, and ease of operation, meeting high standards of energy efficiency and durability. Sky-Frame not only transforms living environments by flooding interiors with natural light but also redefines the relationship between built structures and their surroundings, embodying a harmonious blend of aesthetics and functionality in modern architecture.
Find the answers to the most frequently asked questions about steel and aluminium glazing systems.
MHB windows can achieve substantial dimensions, offering impressive flexibility in design. Typically we see projects with glazing requirements over 3000mm in height but the MHB system facilitates bespoke solutions for projects that require even larger windows, ensuring they meet specific requirements and standards through additional design and testing
The maximum dimensions achievable for Schuco Jansen windows, particularly for the Jansen Art-15 and Janisol Arte 2.0 products, vary based on the specific product and configuration. Both systems offer size flexibility and are commonly used to achieve heights over 3000mm. The scale capability of Janisol Arte 2.0 in particular makes it suitable for applications that require larger glass surfaces while maintaining high stability and slim profiles. These dimensions allow for significant design flexibility, making both Jansen Art-15 and Janisol Arte 2.0 suitable for a variety of architectural applications, from historical renovations to modern residential and commercial buildings.
Sky-Frame windows are renowned for their innovative design and adaptability, particularly their frameless sliding windows. The Sky-Frame system allows large, unobstructed views and integrates seamlessly into various architectural styles. Dimensions and other specifications are customisable to meet specific project requirements, ensuring that Sky-Frame systems provide both aesthetic appeal and functional performance in diverse settings.
Our slim steel glazing systems offer significant acoustic performance, achieving sound insulation values of up to 50 dB, which is excellent for environments where noise reduction is a priority. This means that the systems are effective in reducing noise, making them suitable for both residential and commercial projects that require high levels of acoustic insulation.
All Sky-Frame windows offer excellent acoustic insulation. The Sky-Frame 3 system, which features triple-glazed elements is the most acoustically insulated of the Sky-Frame systems. This high level of acoustic performance makes Sky-Frame suitable for environments where noise reduction is crucial, such as urban areas or near busy roads.
Yes, Sky-Frame windows are suitable for use near the sea or on coastal properties. They are designed to withstand harsh environmental conditions, including salty air and strong winds commonly found in coastal areas. The materials used in Sky-Frame systems are resistant to corrosion, and the systems are built to provide durability and longevity in challenging environments.
Steel glazing systems like MHB and Schuco Jansen are suitable for use near the sea or on coastal properties due to their robust construction and superior surface treatments designed to withstand harsh environments. MHB steel glazing systems, such as the SL30-ISO-PLUS, feature advanced surface treatments that make them highly resistant to corrosion. These systems are powder-coated with a “Super Durable” quality finish, meeting stringent standards like the ISO 12944-2:2018 for high corrosive environments. This makes them suitable for marine and coastal applications where salt and humidity can cause significant corrosion issues. The systems also offer excellent weatherproofing, wind, and water tightness, with high resistance levels tested up to Class E1200 (1200 Pa) in accordance with European standards. Schuco Jansen steel systems are engineered for durability and high resistance to environmental factors. They can be finished with corrosion-resistant coatings that enhance their suitability for coastal applications. Their design and engineering focus on durability and resistance to corrosion ensure that these systems remain functional and aesthetically pleasing in coastal environments.
Yes, steel glazing systems such as MHB and Schüco Jansen do offer fire and smoke resistance, up to 120 minutes depending on other factors. These systems are designed to meet strict safety standards, maintain structural integrity, provide effective fire resistance and help contain smoke, ensuring safety in case of fire emergencies.
Sky-Frame windows are not fire-rated. While they offer numerous benefits such as high thermal insulation, sound control, and frameless aesthetics, they do not provide fire resistance. These windows are designed for superior thermal and acoustic performance, and they meet high standards for wind load resistance, water tightness, and air permeability.
If fire resistance is a critical requirement for your project, you would need to look into other window systems specifically designed and tested for fire and smoke resistance. Our team can advise you on the most suitable system for your requirements. Many steel glazing systems, such as those offered by MHB and Jansen, do provide fire-rated options that can meet stringent fire safety regulations.
While the initial cost of steel glazing systems can be higher than aluminium or timber, their longevity, durability, and low maintenance needs often result in cost savings over the lifecycle of the building, making them a durable choice for sustainable buildings. Due to their excellent thermal insulating properties, they assist in reducing energy consumption. Furthermore, steel is a highly recyclable material, making it an environmentally friendly solution for window and door frames.
Yes, steel glazing systems are versatile and can be used in new constructions, renovations, and retrofits, providing a modern update to existing structures.
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