The Window Sanctuary on Facebook

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 manufactured to replicate the appearance of traditional steel windows and “crittal” style windows. (Please note we do not supply the Crittall brand). Beautifully designed with close attention to detail ensures that you would be hard pressed to notice the difference from steel windows and our aluminium replacements. The likeness to steel windows is accentuated by the similar looking joints which replicate traditional items & demonstrates the attention to detail in the manufacture of our slimline steel replacement windows. 

Our very popular Alitherm slimline aluminium steel replacement doors and windows replicate the sleeker look of some traditional steel windows and retain the traditional style of your original heritage windows – even french door styles can be replicated. Our steel replacement windows and doors can be used externally, or internally as room dividers.


Why not personalise your new aluminium steel replacement doors and windows with a choice of over 200 RAL colours, and we offer 12 stock colours for no additional cost – please ask for more details.  Twin colours are also available to suit your desired look. We also provide a bespoke range of heritage handles, please ask for more details, or why not pop into our Brasted showroom to view our full range of windows & doors on display.

Should you wish to discuss your extension or home refurbishment project with one of our experts, please do not hesitate to call us or complete an online enquiry form. All of our steel replacement & art deco replica window and door products are on display in our Brasted showroom with easy access from Kent, Surrey and Sussex. We also provide Free onsite consultations & no obligation quotations with friendly, unbiased, expert advice.

‘Aluminium Provides the Contemporary Art-Deco Look home owners are looking for in a replacement steel window or door.’

Why choose slimline steel replacement windows made of aluminium?

slimline steel replacement windows
  • Low U Values + excellent thermal efficiency
  • Slim sightlines
  • Low maintenance
  • Over 200 RAL colours to choose from + stock colours
  • Complies with modern Building Regulations.
  • If you've ever built a house you'll appreciate how hit and miss glass contractors can be, but The Window Sanctuary stand out as reliable, good quality and easy to deal with. The guys turned up on time, worked really hard and did a fantastic job. I wouldn't hesitate to recommend this company.

    thumb Rebecca Stiasny
    February 24, 2021
  • Great family company. Quality workmanship. Highly recommended.

    thumb Mark Childs
    July 4, 2021
  • The team at The Window Sanctuary have been a delight to work with. They have given us really personal customer service, ensuring that every final detail works for us and our build and have listened to what is important to us (happy to be flex when we change our minds!). Quick to respond and offering a really consultative approach, alongside good value for high quality products, I would strongly recommend their service. I was really specific in what I wanted for bifold doors, wanting time achieve that much coveted Crittall appearance and they’ve made this work for us with a good quality option that doesn’t break the bank. What a find!

    thumb Abigail Barclay
    January 20, 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.

    thumb Lucy Niz
    October 4, 2020
  • 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.

    thumb Raghu Lall
    October 30, 2019
Choices Assure accrediated installer
DGCOS accredited member in kent
smart architecural aluminium supplier
cortizo at the window sanctuary