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Get an EstimateHere is what matters most at a glance:
Taking inspiration from traditional steel doors, Alitherm Heritage features signature slim sightlines and attractive aesthetic contours — coupled with polyamide thermal break technology for enhanced thermal performance.
The system achieves a U-value of 1.5 W/m²K when installed with a suitable sealed unit.The thermal conductivity of polyamide is 160 times better than steel — saving around £95 each year in fuel costs for a typical terraced house.
Alitherm Heritage doors are available as single, double or bi-folding doors— all made to measure for your exact opening, with multi-point locking and face-mounted shoot bolts as standard.
Alitherm Heritage door profiles feature the system’s signature slim sightlines and elegant lines that complement Smart’s existing Alitherm Heritage windows and mimic those of steel doors.
Whether you’re pairing them with our Alitherm Heritage Windows or replacing existing steel balcony doors on a period conversion, the profiles align precisely — same sightlines, same finishes, same hardware family. The whole scheme looks considered and intentional, which matters enormously on sensitive projects.
The Alitherm Heritage door provides the solution for conservation areas where planning regulations require a like-for-like product replacement.The range has been approved for use by many local authorities, including London boroughs and CADW — the Welsh government’s historic environment service.
If you’re navigating a planning application or working with a conservation officer, this level of recognised credibility can make a genuine difference to your project timeline. Our team understands these projects inside out and will guide you through every step.
Visit our London showroom to appreciate the stunning aesthetics of our products up close. You can explore our slim aluminium range, showcasing the external Alitherm Heritage profiles.
Seeing the real door — the sightlines, the hardware, the finish quality — makes all the difference before you commit. Our team will walk you through every option, without any pressure.
Ready to get started? Contact us today for a free, no-obligation quote.
Colours
Our aluminium windows are available in a vast array of frame colour options, including classic black and contemporary hues. The iconic black steel finish is not only visually stunning but also seamlessly complements a range of architectural styles, ensuring a stylish and cohesive look for your property.
Anthracite Grey
Black
White
Hardware
Select from an array of hardware options for your aluminium products, including durable hinges and locks designed for optimal functionality. Our choice of high-quality finishes provides both aesthetic appeal and reliable security features for your windows.
Standard Handle
Bulb End Handle
Monkey Tail Handle
Art Deco Handle
Bulb End Peg Stay Handle
Downloads
Access our downloads section below to discover vital specifications and design options for our aluminium windows, engineered to offer exceptional performance and modern style for both residential and commercial applications.
We address some of the most frequently asked questions regarding our aluminium doors, providing you with essential information to help you make informed choices for your project.
Yes.
They have been specifically designed to meet stricter planning restrictions often associated with older listed buildings, giving customers the option to use aluminium doors where planning restrictions would otherwise have prevented it.
Perfectly.
Alitherm Heritage Doors are designed to perfectly complement the design of the Alitherm Heritage range of windows, with each door carrying a marine quality polyester powder coat as standard to ensure durability.
The Alitherm Heritage Doors have a max sash width of 900mm and a max sash height of 2100mm. All doors are made to measure — contact us with your opening dimensions and we'll advise the best configuration.
Numerous glass options are available, including 24mm, 28mm, 32mm and 36mm units.
We'll advise the best specification for your project and thermal requirements.
Not sure what you need? Speak to an expert
Despite being a small project by comparison, from start to finish our project has been executed with precision, promptness and professionalism to deliver a thing if beauty which as we...
Read more
Sharman & Phil
LOVE. LOVE. LOVE my windows and doors! They look amazing! 😍 Lightfoot Windows were a pleasure to deal with. Polite, helpful and informative. Plan to use them again for a...
Read more
Adiba Ghauri
Very efficient and thorough. Quick installation. Very helpful and friendly staff. My new Crittall windows are beautiful.
Read more
Susan Tuffy
I would like to thank the team at Lightfoot windows for supplying and fitting my new Crittal windows, from start to finish the service has been great and the product...
Read more
Lee
Excellent windows (Heritage Aluminium french doors). Our builder was impressed with the excellent quality and will be using again. Efficient fitting, fitted perfectly.
Read more
Sophia Barlow
I am very pleased with the Crittall windows as supplied and fitted by Lightfoot. I visited their showroom and discussed the requirements, and these were met in full. From the...
Read more
David SC
Probably one the best experiences we've had with a building contractor/supplier. We went to the showroom where we were given all the information we needed and shown the various options...
Read more
Paul Phillips
Lightfoot supplied & installed a steel Crittal arch for an internal opening. Both the design and install process was very professional and we are delighted with the product. Would highly...
Read more
Richard Simpson
We have used Lightfoot Windows on two occasions now, and both times their service has been exemplary. The products we purchased are also of a very high quality and we...
Read more
Martin French
I cannot recommend Lightfoot highly enough. I used to run a business, and the sheer pleasure and relief of being communicated with properly and courteously means a lot. It’s rare...
Read more
Catherine C
So happy to have found Lightfoot Windows who supplied fire rated Crittall doors and screens. Great showroom full of inspiration. Unhurried great advice given, quote and contract really streamlined and...
Read more
Torsten Mansson
Despite being a small project by comparison, from start to finish our project has been executed with precision, promptness and professionalism to deliver a thing if beauty which as we had hoped brings the outside in - our garden by day and the stars by night. We had the pleasure of Reese (still amazed at the price of a cup of tea and a bed for the night in Driffield) and Brad installing our curtain wall, accounting for the vagaries of an old property on a freezing cold day. Marcin as surveyor/project managing was careful and considered in his surveying and measuring. Clear and concise in his instructions to our builder. Paul's input at the design and acquisition stage ensured there was accurate representation of what we wanted. Praise indeed from an aircraft design engineer used to working to a "thou of an inch". We wouldn't hesitate to recommend investing in this company and its products.
Sharman & Phil
LOVE. LOVE. LOVE my windows and doors! They look amazing! 😍 Lightfoot Windows were a pleasure to deal with. Polite, helpful and informative. Plan to use them again for a new internal window very soon. Would definitely recommend. Thank you guys !
Adiba Ghauri
Very efficient and thorough. Quick installation. Very helpful and friendly staff. My new Crittall windows are beautiful.
Susan Tuffy
I would like to thank the team at Lightfoot windows for supplying and fitting my new Crittal windows, from start to finish the service has been great and the product is first class. great value for money.
Lee
Excellent windows (Heritage Aluminium french doors). Our builder was impressed with the excellent quality and will be using again. Efficient fitting, fitted perfectly.
Sophia Barlow
I am very pleased with the Crittall windows as supplied and fitted by Lightfoot. I visited their showroom and discussed the requirements, and these were met in full. From the initial visit to the final fitting Lightfoot exceeded my expectations and I would unhesitatingly recommend them.
David SC
Probably one the best experiences we've had with a building contractor/supplier. We went to the showroom where we were given all the information we needed and shown the various options for our kitchen patio doors. We selected what we wanted and gave the dimensions and by the time we got home, there was a plan and an estimate in our inbox.
Paul Phillips
Lightfoot supplied & installed a steel Crittal arch for an internal opening. Both the design and install process was very professional and we are delighted with the product. Would highly recommend and I would certainly use them again for future products.
Richard Simpson
We have used Lightfoot Windows on two occasions now, and both times their service has been exemplary. The products we purchased are also of a very high quality and we are really happy with them. The surveyors and installers were careful, considerate and polite. We highly recommend Lightfoot Windows and will definitely use them again should the need arise.
Martin French
I cannot recommend Lightfoot highly enough. I used to run a business, and the sheer pleasure and relief of being communicated with properly and courteously means a lot. It’s rare these days. The windows and installation were excellent. Reece, Grant & Bradley were fantastic. Particularly as they were up against supply issues, parking restrictions not to mention Covid.
Catherine C
So happy to have found Lightfoot Windows who supplied fire rated Crittall doors and screens. Great showroom full of inspiration. Unhurried great advice given, quote and contract really streamlined and easy to understand. Service was excellent throughout visiting, ordering measuring up and installation. Special thanks to Daniel at the showroom, Reece Taylor for an excellent installation and finish. Really pleased with the product and service. Would not hesitate to recommend and will definitely use again in the future.
Torsten Mansson
