Alitherm 400 Window
A versatile range of aluminium windows
The Pioneering Alitherm 400 Window
The Alitherm 400 window is the first thermally broken aluminium system to feature Smart’s pioneering coextruded glazing gasket. This means the beads are supplied with the glazing gasket post-extruded into the profile.
This enables the Quick-Glaze beads to be simply tapped in on site, significantly reducing fabrication and installation time.
Available with a square profile, the slim lines of Alitherm 400 provide excellent weather and thermal performance, as well as the security assurance provided by PAS24 accreditation.
While the flush, flat face option is suitable for off-set, face-mounted espagnolette locks, the square design features a eurogroove, to enable in-line espagnolette locking mechanisms to be used.
Engineered For Energy Efficiency
Combining outstanding value and quality, with class-leading performance and security, Alitherm 400 delivers a range of stylish, energy-efficient window and single and double door options.
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Co-extruded gaskets now available in sashes, outer frames and Smart Quick-Glaze Beads for easier fabrication and faster installation
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Choice of standard, slim line, flush and heritage style sashes
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Tilt Turn window option now available
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Fully compliant with changes to Document L of the building Regulations
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PAS 24:2022 Approved - enhanced security for aluminium windows and doors
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Unrivalled Choice of Colour
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Suitable for Residential and Light Commercial Properties
Fully compliant with Part L of the Building Regulations, this versatile system is perfect for a wide range of both new build and refurbishment projects, including, schools, colleges, hospitals, offices and public sector housing – as well as individual homes. In fact, the system’s supreme flexibility makes it the ideal solution for almost any project.
Both window and door systems provide excellent weather and thermal performance and are available in a huge range of colours. Combining elegant aesthetics and outstanding security performance (the system is approved to PAS:24 2022), Alitherm 400 is the ultimate window and door system for architects, developers, fabricators and installers.
Framing the Future: Alitherm 400
ALITHERM 400 WINDOWS
Available in fixed, side hung, top hung, tilt & turn and flush casement options, Alitherm 400 windows deliver excellent thermal and weather performance, as well as the security assurance provided by PAS24 approval.
ALITHERM 400 DOORS
Alitherm 400 doors perfectly complement the window range, with the same stylish lines and providing the same ease of fabrication and installation.Available as open-in or open-out, single or double doors, the system provides excellent weather and thermal performance, as well as the security assurance provided by PAS 24:2016 accreditation. Security options include a choice of key wind, lift lever or slam lock multipoint locks.
Our handsome range of entrance doors will impress your guests and keep out both the elements and unwelcome intruders. Our Alitherm doors are designed for use as open out or open in, single or double doors, internally beaded with side-light and low threshold options.Elegant, yet strong and durable Alitherm doors enhance the beauty of your home, keep in the warmth and let in more light because of the slim sightlines.Peace of mind is ensured by the enhanced security provided by a multi-point locking system and high security cylinder.
Smarts Designer Doors Brochure
Smarts Alitherm 400 Windows and Doors
In-House Manufacturing
We manufacture Wendland conservatory roofs and Stratus roof lanterns in our UK facility, ensuring consistent quality, quicker lead times, and a reliable nationwide supply. Installers trust Contech for proven products and the confidence that comes from working with an experienced UK manufacturer.
Fast Lead Times
With in-house manufacturing and streamlined processes, we deliver conservatory roofs and roof lanterns quickly and reliably. Installers benefit from shorter lead times, fewer project delays, and the confidence to keep customers satisfied across the UK.
Nationwide Delivery
We provide reliable delivery of conservatory roofs and roof lanterns across the UK. With secure packaging and trusted transport, installers can count on Contech for on-time deliveries direct from our factory to site, helping every project stay on schedule.
Trade Support?
We go beyond supply with expert trade support, technical advice, CAD designs, and detailed installation guides. Our experienced team helps installers every step of the way, ensuring smooth projects and professional results every time.
Why Choose Contech as Your Supplier?
At Contech, we don’t just supply conservatory and roof products — we manufacture them in-house. From our factory in Stoke-on-Trent, we combine decades of expertise with cutting-edge technology to deliver high-quality Wendland Glass Roofs, Supalite Conservatory Roofs, Stratus Aluminium Roof Lanterns, flat rooflights, and aluminium carports. Every product is designed to meet the highest standards of strength, thermal performance, and style.
Installers choose Contech because we are more than a supplier — we are a reliable manufacturing partner, providing consistent quality, technical support, and peace of mind for every project. Whether you’re installing a single conservatory, fitting a bespoke roof lantern, or managing multiple projects, Contech ensures every product is delivered with precision, durability, and exceptional craftsmanship.
From conservatory roofs and roof lanterns to flat rooflights and carports, working with Contech means working directly with the manufacturer, giving you the confidence that every installation meets your high standards and your customers’ expectations.
Wendland Glass Roof
The Wendland Glass Roof is a market-leading conservatory roofing system trusted by installers nationwide. Designed for strength, precision, and style, it can be configured to suit any conservatory shape or size.
With high-performance glazing for thermal efficiency, the Wendland Roof delivers energy savings, year-round comfort, and a bright, modern living space.
LivinRoof Hybrid Roof
The Livinroof Hybrid Conservatory Roof combines the benefits of solid and glass roofing, giving you the perfect balance of light, comfort, and energy efficiency.
Ideal for creating bright, year-round living spaces, the Livinroof Hybrid Roof allows homeowners and installers to extend living areas without compromising on style or performance.
SupaLite Warm Roof
The SupaLite Tiled Conservatory Roof is the perfect solution to common conservatory issues, transforming your space into a comfortable, energy-efficient living area.
With full insulation, a plastered interior ceiling, and a range of optional extras, the SupaLite Warm Roof creates a stunning, year-round space that homeowners and installers can trust for quality and performance.
Stratus Lantern Roof
The Stratus Aluminium Roof Lantern combines slim, modern design with strength and thermal efficiency. Its discreet frame floods interiors with natural light, creating bright, open living spaces.
Perfect for homeowners and installers seeking a stylish, high-performance rooflight that delivers both comfort and energy savings.
hup!
hup! is a revolutionary, energy-efficient system for extending homes and transforming conservatories into bright, comfortable living spaces. Quick to install and highly versatile, hup! works with any extension style, delivering a modern, high-performance solution up to 5× faster than traditional methods.
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