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Modern Steel Windows

Steel windows have been installed in buildings since the 1930’s and form the character and face of a home. The slender sections of a steel window help to contribute charm, style and elegance to a property. We find that many home-owners are looking to find a sympathetic replacement to their existing windows but with the modern benefits of thermal performance, security, durability and ease of maintenance.

This is why the Steel Window Association in conjunction with its members has helped to evolve the steel window into its modern day form.

Today’s steel window is manufactured using sections from the W30 suite of profiles. This evolution of the steel sections allows the windows to be double glazed with thermally efficient units. This helps contribute to a BFRC ‘B’ energy rating.

Traditional Steel Windows

Traditional single glazed steel windows can still be manufactured using the SMW range of steel profiles. These window profiles are the basis of the ‘standard window’ that is installed in many homes throughout the country.

If your home is in a conservation area, is listed or of local historic value then you may be required to match your existing window dimensions and specification exactly to conform to the conservation officer's requirements. Our members are able to offer this service should it be required.


In some instances a home-owner may require that existing steel windows and doors remain but that they are refurbished in some way.

Some of our members are able to help with this. From basic ‘ease and adjusting’ where the existing opening windows/doors remain in situ and are ‘eased’ so that they open and close better, through to full refurbishment where the windows/doors are removed and taken back to the factory for shot blasting, galvanizing, powder coat finishing, servicing, re-glazing and re-installing.

Steel Window Benefits

Hot dip galvanizing ensures that the window will be free from rust and helps to increase the window's lifespan.

Polyester powder coating means that a steel window will not need to be painted for at least twenty years. A wide range of colours are available and can be specified using the RAL colour chart system.

Opening windows can be hinged on the side or the top and come complete with ironmongery that can be sympathetic to the original or with a more modern look. They have a double weather seal and so exceed PAS23 requirements.

Glazing decoration can be specified so that the window retains an existing leaded, Georgian or Modern glazing appearance. The glass units are made up of soft coat glass which helps retain the heat in a home, low ion glass which draws the suns rays through the glass in the winter months, Krypton gas helps increase thermal insulation as well as the added benefit of increased sound insulation and a warm edge spacer also helps increase thermal insulation.

Doors are manufactured from either W20 or W40 steel profiles and complement the steel window in profile and style. Single and double (French) doors are available and can be manufactured to very large dimensions.

Doors are available with traditional mid rails and kicking panels or with large full height glass panes. Locking mechanisms can be traditional mortice locks with lever/lever handles and shoot bolts or concealed multi locking with an internal handle.

All windows and doors are manufactured to bespoke dimensions and designs and therefore ensure that customers can specify what they desire.

The Steel Window Association and its members are constantly looking to evolve this system to help meet the ever demanding building regulation changes. If you need any further information please look on our ‘profile drawings’ section or contact our members.

Steel windows are competitively priced and represent great value.

Fuel bills can be kept down because they provide excellent energy efficiency since they are generally double glazed and weather-stripped against draughts.

The inherent strength of steel windows means that they provide more protection than any other window type against intruders and are available with tried and tested locking systems.

Many members of the Steel Window Association will also repair and refurbish existing steel windows

Fact sheets

We have a number of fact sheets that give more information about various subjects to do with steel windows and doors.

Fact sheets