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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

  • 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
  • Great customer service. Good quality product. We needed a door adjustment and they have sent someone the next day.

    Lucy NNN Avatar Lucy NNN
    March 3, 2021
  • The Window Sanctuary supplied and installed a window in the current house we are restoring. We were extremely happy with the service and quality of the window. Would definitely recommend this company for your period windows.

    sheldon partridge Avatar sheldon partridge
    August 20, 2021
  • 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 team did a great job installing new sash windows in our flat: the wood grain effect on their PVC looks great, they took away our old windows and worked swiftly, on time and on budget to get the new ones fitted. I can definitely recommend them! Thanks!

    Claire C Avatar Claire C
    February 24, 2020