Alitherm Heritage Windows
Alitherm Heritage Windows
Classic Heritage Style with Modern Aluminium
Some homes deserve windows that respect their history. If you own a period property, a converted warehouse, or a home in a conservation area, standard frames rarely do it justice. That is where Alitherm Heritage Windows come in. At 4Moon Windows, we supply and install Smart Alitherm Heritage Windows across Croydon, Thornton Heath, and the wider London area. These windows recreate the slim, elegant look of traditional steel frames. Yet behind that classic face sits a modern, thermally broken aluminium system built for today’s standards. The result is simple. You keep the character your property was built with. You gain the warmth, security, and low upkeep that old steel windows could never offer.
Authentic Steel-Look Design
The slim sightlines maximise glass area, flood rooms with natural light
Outstanding Thermal Performance
Advanced polyamide thermal break technology and modern double glazing
Built to Last
Multi-point locking and shoot bolts, with the system security tested to PAS 24:2016.
Low Maintenance by Design
Marine-quality polyester powder coat finish means no repainting, no sanding, and no rust treatment.
ALITHERM HERITAGE WINDOWS
WHAT ARE ALITHERM HERITAGE WINDOWS?
A Direct Replacement for Original Steel Windows
Alitherm Heritage is a premium aluminium window system from Smart Systems, one of the UK’s leading aluminium manufacturers. It was designed for one clear purpose: to act as a direct replacement for original steel windows. Old steel frames are beautiful, but they leak heat, rust over time, and offer poor security. Smart Heritage Windows solve every one of those problems while keeping the same refined appearance.
Timeless Steel Look, Modern Performance
Each frame features slim sightlines, fine contours, and authentic proportions that mirror classic steel designs. Inside the profile, a polyamide thermal break separates the cold outer face from the warm inner face. This barrier cuts heat loss dramatically and helps the system achieve strong U-values and an impressive energy rating. In short, you get the timeless steel look with none of the steel drawbacks.
Why Choose Smart Alitherm Heritage Windows?
Smart Alitherm Heritage Windows combine authentic steel-look styling with modern aluminium performance, making them ideal for period properties. Slim sightlines and heritage bars maximise natural light while recreating traditional window designs. Advanced thermal breaks, double glazing, and PAS 24 security provide warmth, safety, and long-term durability. With low-maintenance powder-coated finishes and a wide choice of colours and heritage hardware, you can create a finish that feels truly authentic.
HERITAGE WINDOWS CROYDON
Heritage Windows Croydon Homeowners Can Rely On
This is exactly where our Heritage Windows Croydon service shines. Because Alitherm Heritage replicates the sightlines of original steel frames so closely, it is widely accepted for listed building renovations and conservation projects where planners insist the new windows match the old.
Window Styles and Configurations
Smart Heritage Windows are remarkably flexible. Whatever the shape or age of your property, the system adapts to suit it. Popular configurations include:
ALITHERM HERITAGE WINDOWS
Get Your Free Alitherm Heritage Windows Quote Today
Call us or request your free, no-obligation quote online. We will guide you through styles, colours, and pricing, and show you exactly how Alitherm Heritage Windows can transform your property.
FAQ
Frequently Asked Questions
Alitherm Heritage Windows are slim-framed aluminium windows made by Smart Systems. They are designed as a direct replacement for traditional steel windows, combining the classic steel look with modern thermal performance, security, and low maintenance.
Yes. Their slim sightlines and authentic proportions closely match original steel frames, which makes them a popular choice for listed building renovations and conservation areas where planners require a like-for-like replacement. We always recommend confirming details with your local authority, and we can support you through that process.
Very efficient. Each frame contains a polyamide thermal break that stops heat escaping through the aluminium. Combined with modern double glazing, the system delivers strong U-values and can achieve a Window Energy Rating of ‘B’, a huge upgrade on old single-glazed steel windows.
Prices depend on window size, configuration, glazing, colour, and hardware choices. As a guide, they cost significantly less than genuine steel replacements while offering better insulation and security. Contact 4Moon Windows for a free, tailored quote for your property.
Yes. The system is security tested to PAS 24:2016 and features multi-point locking with face-mounted shoot bolts. Optional marine-grade 316 stainless steel hardware adds even more strength and long-term durability.
With minimal care, aluminium heritage windows can last 40 years or more. The powder-coated finish will not rust, rot, or peel, so an occasional wipe-down is all the maintenance they need.