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Metal frame window replacement

Metal Window Replacement

Window Conservation – the need to protect your home’s unique character.


If you are the Custodian of a period or character property and are planning to upgrade the thermal insulation then the correct choice of window framing is essential to maintain it’s original charm.

Steel windows were introduced almost a century ago and over time have proved to be a slim and robust alternative to timber but with very poor insulation properties. A more stylish combination of steel windows inserted into timber surrounds became popular in the 1930s and many examples of these can be found in homes built around this period.

The Window Sanctuary are specialists in replacing the steel window inserts with slimline aluminium replacements whilst retaining the timber surrounds.

Most window Companies will recommend a complete removal of the original frames , metal and wood but this is often not necessary and by retaining the timber surrounds the overall style can be retained and the need for costly internal redecoration negated.

metal window replacement
metal window replacement


The Window Sanctuary employ tradesmen with proven Carpentry skills to carefully extract the steel window inserts and then increase the depth of the rebates in order to accommodate the new Aluminium double glazed window inserts.

The result is a neat, thermally insulated ,sympathetically styled window to match the original – timber included and with upgraded security courtesy of the new key locking window furniture-also available in our original 1930s style Heritage range. 

It is our passion to preserve, wherever possible, the original window designs, the glazing features and the timber enhancements which constitute the overall Fenestration of your home.

It starts with a detailed and accurate Survey. At this point all chosen product details are discussed and noted together with any timber requirements, special mouldings and decorative finishes.

A full survey report will then be produced for Client approval before manufacture commences.

Why Choose Aluminium for METAL WINDOW Replacement?

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


Where new Timber Frames or replacement sections have been requested to accompany new Aluminium window inserts we use local Joinery Companies to manufacture and spray finish to order.

The range of colours is vast and the subtle colour combinations of both Aluminium window inserts and surrounding timber is a whole new topic worthy of further discussion.

Prior to installation of new Aluminium window inserts where original timber subframes are to be retained the preparatory work, primer and undercoats must be done prior to the removal of the steel window inserts.

Following installation of the new Aluminium window inserts we will seal externally with overpaintable silicone and internally with overpaintable caulk. The final coats can then be applied to the timber frames as required.

Our Google Reviews

  • Really enjoyed dealing with the Window Sanctuary. The office team are very friendly and courteous and the installation team were good fun and very thorough. The finishing touches were beyond my expectations. We're delighted with our new windows and the enhanced view they provide.

    thumb Tim Glynne-Jones
    March 9, 2022
  • We had a few quotes for 2 x black aluminium windows and French aluminium doors with fixed side panels. The Window Sanctuary were the most competitively priced and were quick to respond to our quote request and follow up questions. The timeline they gave for delivery and installation was accurate and the installers did a great job. We are really happy with our high quality and stylish looking doors and windows! Makes such a difference to our house.

    thumb Anna Clarke
    September 30, 2022
  • Great customer service. Good quality product. We needed a door adjustment and they have sent someone the next day.

    thumb Lucy NNN
    March 3, 2021
  • 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.

    thumb Richard Simpson
    February 12, 2021
  • Delighted with the new windows that we just had fitted. They are top quality and look amazing. They were very professionally fitted, with great attention to detail. I thoroughly recommend them.

    thumb Scott MacDonald
    November 27, 2020