KP Glass & Windows recommend Smart Alitherm 400 as our go-to aluminium window system for style, performance and value. With expert installation and tailored advice from our team, you can benefit from high-quality aluminium windows that offer low maintenance, excellent thermal performance, and enhanced security – all backed by the trusted support and guidance you expect from KP Glass & Windows.
Whether you’re replacing existing windows or fitting new ones, the Smart Alitherm 400 system delivers performance and flexibility as standard
Key features
Whether you’re replacing existing windows or fitting new ones, the Smart Alitherm 400 system delivers performance and flexibility as standard:
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Excellent Thermal Efficiency: Typical U-values around 1.4 W/m²K and compliant with Part L of the Building Regulations, helping keep homes warm and energy bills lower.
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Enhanced Security: PAS 24:2022 approved for peace of mind and robust protection against forced entry.
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Stylish, Slim Sightlines: Smart’s aluminium profiles offer clean, contemporary visual appeal with a choice of standard, slimline, flush and heritage style sashes.
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Wide Colour Options: Available in an unrivalled range of colours — including single, dual and bespoke finishes — to match any property aesthetic.
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Versatile Window Options: Fixed, side-hung, top-hung, tilt & turn and flush casement styles available to suit your needs.
Explore the window styles below to see which best suits your home or project.
KP Glass & Windows have a dedicated area in their showroom to display our full range of PVCu windows. Speak to our team in person and see for yourself the wide variety of colours, finishes, and styles available, and explore how modern UPVc windows can combine style, durability, and energy efficiency for your home.
Smart Alitherm 400 Window Styles
Smart Alitherm 400 windows are available in multiple configurations to suit virtually any application.
Fixed Windows
Ideal for maximising natural light and expansive views, fixed windows deliver a modern, open feel while maintaining excellent weather performance and security.
Side-Hung & Top-Hung Windows
Offering practical ventilation solutions with strong structural performance, side-hung and top-hung windows are flexible choices for bedrooms, kitchens, and living spaces.
Tilt & Turn Windows
Tilt & turn options provide dual functionality — a tilt for secure ventilation and a turn for easy full-opening access — making them ideal for homes and apartments.
Flush Casement Windows
With clean lines and minimal sightlines, flush casement windows suit both contemporary and traditional properties, combining elegance with superior performance.
Performance & Compliance
Smart Alitherm 400 aluminium windows are designed to meet modern performance expectations:
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U-values from approximately 1.4 W/m²K with appropriate glazing options.
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WER Band A energy ratings standard.
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PAS 24:2022 security approval as standard for enhanced protection.
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Compliant with current Part L Building Regulations for thermal efficiency.
These combined attributes make Alitherm 400 an excellent choice for homes, offices, schools, and light commercial settings.
Colour, Finishes & Customisation
Smart Systems offers a wide selection of colours and finishes – including single and dual colour choices — so you can tailor your aluminium windows to suit your property exactly. Long-lasting powder coat finishes give low maintenance durability and help your windows look great for years.
Upgrade your home with high-performance Sheerline aluminium windows from KP Glass & Windows, combining slim, stylish designs with security and energy efficiency. Get your free online quote today or speak to our expert team for tailored advice. Call us on 01536 525140.
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