Aluminium Secondary Glazing Windows

Secondary Glazing

Perfect solution for listed buildings

  • Unobtrusive design
  • Made-to-measure to reduce draughts
  • Weather resistent seals
  • Can help reduce outside noise

What is Secondary Glazing?

Secondary Glazing is the addition of a slim second window to an existing window. It is a discreet and unobtrusive method of insulating windows and can help to reduce noise. It is also a popular solution in areas that have restrictions on the installation of double glazed windows such as listed buildings.

Secondary Glazing Gallery

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Our range of secondary glazing units

Everest secondary glazing is made bespoke for you, with a range of options and colours to choose from.


Everest aluminium secondary glazing windows are available in white or brown, with the same tone on the inside and out.

Aluminium colours





Everest secondary glazing windows are fitted with a modern handle design, available in white or gold and offering flawless operation and outstanding quality.

Offset Handle
White Offset Handle

White Offset Handle

Gold Offset Handle

Gold Offset Handle


Horizontal sash

Horizontal sash

Vertical sash

Vertical Sash

Side Hinged

Side Hinged

Tech Sheets

Our aluminium secondary glazing tech sheet can be downloaded below as a PDF.

Tech Sheet

Aluminium Secondary Glazing Download

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The benefits of Secondary Glazing

A large Tudor style listed house with discreet secondary double glazing on hinged casement windows

Retain your original style

Secondary glazing for listed buildings or conservation areas is a great solution as replacing windows can be more difficult. The slim aluminium secondary frame is unobtrusive and almost invisible from the outside, blending seamlessly into your home to retain the external character of your property.

Reduce draughts

To ensure a perfect fit our Secondary Glazing is made-to-measure, reducing draughts or rattles from your old elegant windows. The thermally toughened secondary glass acts as a form of double glazing by trapping air between itself and the existing window, providing extra insulation to keep your home warmer and energy bills down. All in all secondary glazing costs you less and makes your home more cosy.

A traditionally styled window with white aluminium horizontal secondary glazing
Secondary windows with two locking points for added home security

Keep your home safe and quiet

The extremely robust frames on our secondary windows firmly close with two locking points to provide additional home security against forced entry. This extra pane of glass can also reduce noise pollution from outside which is particularly useful if you live near a busy road or an airport. Overall not only does secondary double glazing cost you less for installation it can also help to make your home more secure and quieter.

Guaranteed for peace of mind

Aluminium is very robust and virtually maintenance free and Everest secondary glazing comes fitted with a 10 year guarantee.

Secondary Glazing FAQs

At Everest, we understand that choosing new windows can be a daunting task. So to help you here are some frequently asked questions which you might find useful.

  • +
    Is secondary glazing the same as double glazing?
    No secondary glazing is very different to double glazing. Secondary Glazing is the application of a separate thin frame with a single glazed pane of glass in the window aperture. It's a very effective way of improving the performance of an original single glazed window which is letting in draughts but is not suitable to change either for access reasons or because you love the design of your old windows and you don't want them replaced.
  • +
    Does secondary glazing work?
    Yes secondary glazing is very effective by creating a large air gap between the old window and the room. In addition its less expensive and easier to install than replacement windows. Secondary glazing helps with heat retention, reduces draughts and can also be effective at reducing noise pollution.
  • +
    Does secondary glazing reduce noise?
    The robust frames on Everest secondary glazing provides an extra pane of glass and can therefore reduce external noise. This can be particularly useful for properties located near busy roads or airports.
  • +
    Does secondary glazing stop condensation?
    Condensation on the original window will be expected to reduce as the addition of the secondary glazing will reduce the levels of humidity on the old window. This is because the new pane creates a very effective break from any moisture in your home forming on your old window.
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    Do I need listed building consent for secondary glazing?
    Secondary glazing can offer a perfect solution, as it does not damage or alter the original windows and is fitted inside the home. Also as it is easy to remove without damaging the fabric of the building, most planning authorities see it as an acceptable upgrade to a building. However, if you want to be certain it is always advisable to consult your local planning advisers.

    Read more: Do you need planning permission for windows...
  • +
    What is secondary glazing for sash windows?
    Secondary glazing for sash windows can be a perfect option if you live in a conservation area or listed building. These often comprise of a vertical sliding unit fitted on the inside of a sliding sash window. The secondary glazing will sit discreetly inside the window, helping to improve energy efficiency, without impacting the façade of the property.

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Advice and inspiration

Do I need planning permission for windows

Planning permission

Discover if you need planning permission for replacing your old windows.


Window design ideas

Window design ideas

A selection of window designs to give you inspiration for your home.


How to choose replacement windows

Replacement windows

Everything you need to know about replacing your old windows.


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  • Offer ideas and practical solutions
  • Show you samples of our products
  • Take all necessary measurements

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