Steel-type window replacements

Smart Alitherm Heritage windows and doors

Period styling and slim sightlines in a high-performance aluminium window.

The ideal replacement window for period homes and heritage applications

Alitherm Heritage from Smart Systems is an ideal replacement for period steel windows. An aluminium system developed to emulate steel-type installations, the Smart Systems Alitherm Heritage Window intelligently employs polyamide thermal-breaking technologies to create an effective barrier between cold air outside and warm air inside, delivering an enhanced level of thermal performance and energy efficiency.

It’s perfect for heritage applications including listed building renovations and refurbishment projects with a conservation requirement.

We also offer steel look french doors

Our steel look French doors offer an alternative to going to real steel with thermally broken profiles and 28mm double glazing to achieve a thermally efficient steel equivalent. These are available in many different design variations as well and colour varieties depending on your preference.

Steel look is very popular on the market due to the fact it complies with building regulations and adds a minimal profile with more glazing area to your property. If you are looking for a industrial feel this product would be the best pathway to achieve that. We can offer French doors, single doors in this profile.

Looking for heritage replacement windows?

Have you seen our range of low maintenance and energy efficient timber alternative windows including heritage flush casement and sliding sash window options?

Get up close and personal (with our products!)

Visit our window and door design centre

Windows and doors are a big purchase, so making time to get it right is important. We think there’s no replacement for seeing windows and doors ‘in the flesh’, opening and closing them and picking out the fine detailing that brings the all-important finishing touches to your project.  

With showrooms in Banbury and Beaconsfield, we bring our product ranges closer to you.   

Our Window and Door Design Centre, is located 15 miles north of Oxford in Banbury and carries our complete product range.