Alitherm Heritage
Perfect for Both Contemporary and Traditional Installs
Alitherm Heritage has been designed to offer a modern solution for heritage and renovations applications where the requirement to replace old steel crittal windows is essential. It provides the ideal solution for listed building renovations and large scale replica-refurbishment projects where planning constraints are to be considered.
The slim slender profile means the Alitherm Heritage system is also the perfect solution for contemporary properties. Installed both internally and externally, the windows and doors are designed to be built as a series of horizontal modules which can be stacked using horizontal couplers to form a multi-part window featuring a specially designed drip bar between modules.
Alitherm profiles utilise Smarts’ innovative polyamide thermal break technology which creates a barrier between the cold air outside and the warm air inside. This technology significantly reduces thermal transmittance and enhances the overall U Value of a product and is designed to meet the exacting requirements of Document L.
Colours and Profiles
Available in a choice of standard or non-standard colours, including metallic, dual colour, Smart Architectural Aluminium Sensations textured, and Alchemy anodised effect finishes.
- Fixed windows
- Single or double sash, side hung open out casements
- Top hung open out casements
- Pivot windows
- Polyamide thermal break provides enhanced thermal performance
- Designed as a direct replacement for steel windows
A wide range of benefits
Alitherm Heritage provides a modern light-weight, high-strength and cost-effective alternative to traditional steel window and door systems, offering a wide range of benefits including:
Increased Lifespan
Because aluminium does not rust or rot, window frames provide great longevity and can last indefinitely. This also means that the aluminium windows have the longest lifespan of any window framing material, with typical replacement periods of 40 years – compared to a typical 35 year
replacement period for steel, PVC and timber.
Reduced Maintenance
Maintenance for aluminium systems is simple and straightforward, with a routine ‘wipe-clean’ all that is required to keep the products looking their best.
With no requirement for re-painting or re-varnishing, aluminium windows and doors will never fade, deteriorate or rust, even in harsh environments, such as coastal locations, where steel windows can be particularly prone to rust, requiring regular maintenance and eventually, replacement.
Widely installed in both new and refurbished commercial properties, Alitherm Heritage aluminium windows and doors are equally perfect for residential homes too.
Improved Thermal Efficiency
Modern aluminium windows are thermally-broken using polyamide, an excellent insulator which helps to insulate windows against heat loss.
The thermal conductivity of polyamide is 160 times better than steel, which for a typical terraced house would provide a saving of around £95 each year in fuel costs.
In addition to these energy savings, the polyamide also raises the internal temperature of a house, helping to reduce the risk of condensation.
What Our Customers Are Saying About Us



The quality of the window is excellent and has made a huge difference to the room. The fitters were professional, friendly, and extremely polite. They completed the installation to a very high standard, worked efficiently, and left everything clean and tidy afterwards.
I would highly recommend this company to anyone looking for new windows or doors and I will definitely be using them again in the future.



From the initial quotation through to the measuring and final installation, everything was handled smoothly and professionally. The whole process felt well organised, and we were kept informed every step of the way.
A special mention has to go to Ross and Lee, the fitters, who were absolutely fantastic. They were professional, friendly, and incredibly hardworking. Their attention to detail was outstanding, and nothing was ever too much trouble—they took real care to make sure everything was completed to the highest standard.
The end result looks amazing, and the quality of the workmanship really shows. We would not hesitate to recommend Ruislip Windows to anyone looking for excellent service and top-quality installation.


Their post-sales customer services is also excellent. Many thanks.






We are delighted with the look and quality of our new windows and doors and have already noticed a considerable difference in the warmth in our home (we had single glazing previously.
We would also like to thank and give a big commendation to the Installation team of Tom and Lee. They were throughly professional, courteous and friendly in doing an outstanding job. A particular thank you to Tom, the Lead installer who went above and beyond in making good and ensuring that we were happy customers.
Thank you to all at Ruislip Windows and the highest recommendation.




The fitters Fernando and Casio were great. Did a great job cleaning up after a quick installation.






Altogether an impressive result.





We have used Ruislip Windows before and would recommend them to anyone that asked.
Thank you to everyone we spoke to, we are well pleased with the final item.
Steve and Jenny Welsh

We received a text, within the period advised by the surveyor, asking us when would be a convenient time for the installation.
On the day of the installation the first fitter arrived early in the morning and started removing the old windows and doors. Soon after a second van arrived with the replacement doors and windows and installation commenced. The men worked non stop and completed mid-afternoon. The surrounds of doors and windows were repaired where necessary. The old fittings were removed and all the rubbish swept up and cleared away.
We were shown how the locks and the internal blinds worked.
Overall we are very satisfied with the new doors and windows and the workmanship of the fitters. We would certainly recommend Ruislip Windows and Doors Ltd to anyone.
Our 40 Year Tried & Trusted Process
We’ve been fitting double glazed windows, doors, and conservatories for four decades. Our proven process delivers outstanding results time after time, giving customers excellent installations on every project.
Book an Appointment
Free Quote
One of our experts will visit your home to measure up and discuss your options. You’ll then receive a clear, no-obligation quotation.
Confirm Date
Once you’re happy to go ahead, we’ll schedule your installation for a date that suits you best, keeping you informed every step of the way.
Job Complete
Our experienced fitters complete every job to the highest standard, leaving your home tidy and your new windows, doors, or conservatory ready to enjoy.