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Aluminium Secondary Glazing Windows

Secondary glazing

Secondary Glazing

Energy efficiency for listed buildings

  • Unobtrusive design
  • Made-to-measure to reduce draughts
  • Weather resistent seals
  • Reduces external noise
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Secondary Glazing From Everest

Secondary glazing is a glazed panel in a frame that is installed to the inside of your existing window. There are different types of secondary glazing, ranging from a DIY plastic-glazed frame that can be clipped to the inside of a window. Or, a glazed unit that is professionally installed. The main reason homeowners install secondary glazing is when they can’t change their windows from the original architectural style of window, usually single glazed. This is either for listed buildings, properties in conservation areas, or to maintain the architectural integrity of the original design.


The gap created between a window and the secondary glazing creates a thermal barrier that has two main benefits. The gap helps the window to reduce heat loss – this is a huge benefit for period properties that struggle to increase their energy efficiency. The gap is also effective at reducing external noise and can be more effective than specialist noise reduction glass.


At Everest, we manufacture and install made-to-measure secondary glazing with an aluminium frame and glass pane. Our secondary glazing is unobtrusive, stylish and the perfect solution for buildings that can’t install double glazing. Everest secondary glazing is available in four styles, horizontal sliding sash, vertical sliding sash, hinged casement sash and fixed sash.

Our Secondary Glazing Units

Everest secondary glazing units are fully glazed for optimal clarity and to avoid the hazy plastic of cheaper units. Frames are made from aluminium for a stylish, slim and unobtrusive unit. We offer horizontal sliding sash, vertical sliding sash, hinged casement sash and fixed sash styles. Everest secondary glazing is made bespoke for you in the UK, with a range of options and colours to choose from.


Secondary glazing design styles

Horizontal Sash

Horizontal Sliding Sash

Vertical Sash

Vertical Sliding Sash

Hinged

Hinged Casement Sash

Fixed Sash

Fixed Sash

Secondary glazing frame colours

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


Aluminium colours

White

White

Brown

Brown

Commonly Asked Questions

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

The benefits of Secondary Glazing

When you need to retain the original style

If you live in a listed buildings or conservation area, it might not be possible to change your single glazing, so secondary glazing is a great solution for energy efficiency. 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.

Increase energy efficiency

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

Reduce external noise

Secondary glazing is one of the most efficient ways to reduce noise levels coming into your home. The gap inside double glazing units is 16 or 20mm. Secondary glazing can create a gap of more than 100mm. The wider the distance between your windows and the secondary glazing and the more the sound is reduced.

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Secondary Glazing Gallery

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White Everest secondary glazing window with window decorations

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Everest Secondary Glazing – the perfect complement to your existing windows

If you're blessed with wonderful original windows that you are restricted to change or you just prefer not to, then Everest secondary glazing offers you the benefits of double glazing. It's unobtrusive, robust and blends seamlessly into your home as seen in this picture.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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The details that seal the deal

Here, the Everest secondary glazing is half open but the original window left closed. The close up picture on the right shows the clean flush fitting of the secondary glazing unit, the smooth running track and the brush seal to keep the draughts out when closed. Everything is virtually maintenance-free as well.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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Close up of a white Everest secondary glazing window with window decoration

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White Everest secondary glazing window with window decorations

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White Everest secondary glazing window in open position

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Handles with care

Like the frames, Everest secondary glazing handles are available in a choice of colours and are fully lockable. You can also have them offset. Enhanced security benefits include anti-burglar catches.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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Made to measure with real precision

Our tolerance for gaps is far less than our competitors as seen here, where the secondary glazing fits perfectly into the window aperture so it can unobtrusively fulfill its role of keeping noise and draughts out and warmth in. All this while you can still enjoy your original windows.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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Close up of a white Everest secondary glazing window

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White Everest secondary glazing window in open position

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Outside view of a white Everest secondary glazing window

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Invisible from the outside

Here you can see how the house and its windows have retained its original look. For once we’re delighted not to show you our products – from the outside, you simply can't see the secondary glazing at all.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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Take a closer look

Whichever angle you look from and even close up, the secondary glazing in these pictures just can't be seen. Instead you have the original glazing, just as it was, with the house retaining its wonderful character and history.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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Outside view of a white Everest secondary glazing window

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Outside view of a white Everest secondary glazing window

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Black and white picture of a white Everest secondary glazing window

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The Secondary Glazing pioneers

This picture dates from the 1970s, although we’ve been making secondary glazing for as long as we’ve been in existence. It was a great way to make your house quieter and warmer in the days before the arrival of aluminium double glazing (which we also pioneered).

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At home or at work, always the best

Our secondary glazing is just at home outside the house, and numerous offices, institutions and even some police stations have had it installed over the decades. Nowadays it’s more advanced of course, but it’s still essentially the same practical, unobtrusive and effective solution that it’s always been.

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Black and white picture of a white Everest secondary glazing window

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Black and white picture of a white Everest secondary glazing window

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White vase with flowers on a table

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Closed…

Here’s the same room you saw earlier but styled differently. It shows how your home will continue to look just how you want it to, with the original windows forming the perfect backdrop and the secondary glazing unobtrusively keeping out noise, draughts and the cold.

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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….And open

Even with the window half open, the secondary glazing is barely noticeable. With this secondary glazing you can easily control the amount of air you want to let in. Factor in all the advantages like warmth, noise reduction and security, and we think that it makes an open and shut case for Everest secondary glazing!

Project: The Barnes House
Styled by: Arianna Trapani
Photographer: Colin Poole

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White vase with white flowers on a table

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White vase with flowers on a table

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High-quality Secondary Glazing, guaranteed

  • Aluminium frames are very robust and virtually maintenance-free so your windows stay looking great for many years.
  • Everest Secondary Glazing is fitted with a 10 year guarantee on the whole window and installation.
Secondary glazing windows in the UK

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