An Introduction to Secondary Glazing

Secondary glazing involves placing a single glazed pane inside its own frame on the room side of your current windows. This creates double glazing.


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Styles of secondary windows include vertical and horizontal sliders, side or top hung, lift-outs, double-side hung and fixed panels.

Advantages of Secondary Glazing

Secondary glazing is cost-effective since it improves heat retention and reduces sound, as well as supplying extra security.

It can be an excellent cheap alternative to replacing primary windows with double or triple glazing.

Secondary windows units typically open up so you can gain access to open or clean your primary windows.


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Secondary glazing is notably cheaper than fitting replacement windows because your existing windows stay in place.

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The Centre for Sustainable Energy investigates secondary glazing here:

Reduce Heat Loss

A big long-term advantage of secondary glazing is its heat retention ability. As it adds an extra layer of glass, this reduces both the amount of warm air that can leave your home and the quantity of cold air that can come in.

The warmth your heating system produces will stay inside instead of escaping through windows that are inefficient, and fewer draughts are the result. Your heating bills might drop noticeably as your home becomes more energy-efficient.

Experience Less Noise

Secondary glazing is also a physical barrier against annoying external noise, with closed windows limiting the sound entering your home. This can be improved by putting in special sound-restricting laminate glass.

Extra Protection for Your Existing Windows

Secondary glazing means that your existing primary windows may stay. This is particularly helpful in listed buildings, buildings subject to an Article 4 Directive, and zones where planning permission regulations ban any aesthetic external changes to primary windows.

These older properties are often draughty, and putting in place secondary glazing that doesn’t need planning permission could be the only effective way to increase sound insulation and minimise heat loss.

Where windows can’t be replaced or where you can’t afford to replace them, secondary glazing is a viable alternative solution. It’s also a good cost-effective option for rented accommodation.

Low-Maintenance Windows

Installing secondary glazing doesn’t cause the same level of disruption as installing replacement double- or triple-glazed windows. It can last for many years.