and Single and Double Doors
Alitherm 400 Windows
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The Alitherm 400 system perfectly balances modern style and practical performance. Proudly made in Britain by Smart, this range of aluminium windows and doors is ideal for various projects, from new builds to refurbishments. Combining sleek designs with exceptional energy efficiency and robust security, the Smart Alitherm 400 is designed to meet the demands of both residential and light commercial applications.
Alitherm 400 Windows
With the Alitherm 400 windows, you get more than a stylish upgrade. Thanks to Smart’s innovative co-extruded glazing gasket, these windows make installation quicker and easier, saving time and cost. Whether replacing older timber, uPVC, or steel windows or looking for new ones, this range delivers high performance and a modern aesthetic.
Heritage Flush Sash
A sleek, energy-efficient solution that modernises the look of older properties without compromising character. Perfect for both refurbishment and new projects.
Flush Casement Windows
These are a popular choice with clean lines and a contemporary feel. The flush sash and frame design combine thermal efficiency with a timeless look.
Standard Flush
Available in fixed, top-hung, or side-hung configurations, this option suits virtually any window application.
Tilt & Turn Flush
It can be tilted for ventilation or fully opened for maximum airflow and easy cleaning access. It’s the practical choice for modern living spaces.
Alitherm 400 Doors
The Alitherm 400 doors aren’t just about looks—they’re packed with features that deliver performance, security, and versatility. Whether it’s a single or double door, open-in or open-out, this range is perfect for homeowners and commercial projects.
- Flexible Configurations: Choose between single or double doors with open-in or open-out options. .
- Enhanced Security: PAS 24:2016 accreditation ensures top-level protection, with options for key wind, lift lever, or slam lock multipoint mechanisms.
- Customisation Options: Combine with Smart’s Designer Door Panels or select from a range of stylish hardware, including colour-matched handles or Quantum stainless steel designs.
What Makes Alitherm 400 Stand Out?
For homeowners wanting to replace old steel balconies or entry doors, Alitherm Heritage doors are the perfect match. Their elegant design includes signature slim sightlines that emulate classic steel, easily meeting conservation area requirements.
- Energy Efficiency: With an extended polyamide thermal break, the Alitherm 400 windows and doors are built to reduce heat loss, keeping your space warm in winter and cool in summer.
- Easy Installation: The Quick-Glaze bead makes fabrication faster and more straightforward, saving time and costs on-site.
- Security You Can Rely On: All systems meet PAS 24:2016 standards, offering enhanced protection for your home or business.
- Regulation Compliant: It is fully compliant with Document L of the Building Regulations, making it a forward-thinking choice for new builds and renovations.
Built for All Projects
From sleek flush windows to versatile tilt-and-turn designs, the Smart Alitherm 400 range is as adaptable as it is efficient. Whether upgrading a heritage property, fitting out a contemporary home, or working on a light commercial project, this system offers solutions tailored to every need.