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Slimline steel replacement windows & doors

An excellent aluminium replacement for traditional steel windows and doors in a range of colours.


Our aluminium slimline steel replacement windows and doors are crafted to perfectly emulate the timeless appeal of traditional steel windows and “crittal” style windows (Please note that we do not supply the Crittall brand). Meticulously designed with a keen attention to detail, our windows and doors are so well-crafted that it’s difficult to distinguish them from steel windows. Our slimline steel replacement windows feature joints that closely resemble those found on traditional steel windows, further showcasing the exceptional craftsmanship that goes into their production.

Our slimline aluminium steel replacement doors and windows are extremely popular due to their ability to replicate the sleek look of some traditional steel windows while still maintaining the charm of your original heritage windows. We even offer french door styles that can be replicated to complement your existing aesthetic. Our steel replacement windows and doors can be used both externally and internally, making them a versatile and elegant choice for any property.


Looking to add a personal touch to your new aluminium steel replacement doors and windows? We offer over 200 RAL colours to choose from, as well as 12 stock colours at no additional cost. Plus, with our twin colour options, you can create a unique look that perfectly suits your style. And for those who want to embrace the heritage feel, we have a bespoke range of handles to choose from. Visit our Brasted showroom to view our full range of windows and doors on display and discuss your project with our experts.

We also offer free onsite consultations and no-obligation quotations, with friendly and unbiased expert advice to help you make the right choice. All our steel replacement and art deco replica window and door products are on display in our Brasted showroom, which is easily accessible from Kent, Surrey, and Sussex.

With aluminium, you can achieve the contemporary art-deco look you want in a replacement steel window or door. Contact us today to find out more.

Why choose slimline steel replacement windows made of aluminium?

  • Low U Values + excellent thermal efficiency
  • Slim sightlines
  • Low maintenance
  • Over 200 RAL colours to choose from + stock colours
  • Complies with modern Building Regulations.

Our Google Reviews

  • Very professional. I have used other window companies before but the service provided by them left much to be desired when compared to Window Santuary. Any snagging problem was promptly sorted out by the management promptly and to our satisfaction. The workers were very punctual, came daily and stopped only when fully finished. I would highly recommend this window company to others.

    Raghu Lall Avatar Raghu Lall
    October 30, 2019
  • From the start The Window Sanctuary were friendly and polite and a pleasure to deal with. They offered lots of advice, especially helpful as our installation was a little tricky. We also had lots of issues with our extension which caused delays our end, which The Window Sanctuary worked around, even though it meant the installation had to be carried out in two lots, when initially it was meant to happen in one go - they were very accommodating and patient, thank you! Would definitely recommend.

    Nicola Bandy Avatar Nicola Bandy
    January 2, 2022
  • The Window Sanctuary supplied and installed our patio doors. We are extremely happy with the service they provided and couldn’t be happier with how the doors have turned out. They are exactly the look and quality that we were after.

    ben jeffree Avatar ben jeffree
    May 21, 2021
  • One year ago we had our windows and doors installed. We are very happy with the product so far. What made me write a review one year later is their amazing customer service. Our door needed adjustment and I asked someone to look at it and fix it. They send an engineer the next day, who came on time and managed to fix it. Very pleased. As it is quite rare these days, companies cut corners and dont look after their clients.

    Lucy Niz Avatar Lucy Niz
    October 4, 2020
  • A great experience with The Window Sanctuary. They supplied and installed some celestial windows and roof lights to a loft conversion that we carried out. It is a period property with original sash windows and it was important to us that the new windows were in keeping with the character of the original house. We are delighted with the finished product. The customer service was very good and they were amenable when our architect got carried away and the window sizes increased quite materially from the original quotation - thereby working hard to minimise the extra costs. The quotation process was quick and efficient. Their surveyor, Steve, was very professional and also had a strong technical knowledge to help advise us during the build stage. The installation team were very professional and worked extremely hard to get the windows fitted during poor weather. The lady on the front desk, Jeannette, was also very friendly/helpful despite my numerous calls to the office throughout the process. There were a few delays but this was the result of CoVid as opposed to anything in their control, and Simon worked hard to get the order pushed through the suppliers and installed promptly. I always like to support local businesses and this one did not disappoint. Will definitely use them again going forward for any further works. Thank you.

    Richard Simpson Avatar Richard Simpson
    February 12, 2021