What’s the difference between double glazing and secondary glazing?


Two popular techniques to increase a building’s insulation and energy efficiency are double glazing and secondary glazing. Before deciding on one over the other, homeowners and builders should take into account their distinct differences, even though they may sound identical. We shall examine the distinctions between double glazing and secondary glazing, as well as their advantages and disadvantages, in this post.

Dual-pane windows

A well-liked technique for insulating windows is double glazing, commonly referred to as insulated glazing. Fitting two glass panes with a layer of gas or air in between them is required. As a result, your home will be kept warmer in the winter and cooler in the summer by reducing heat transmission through the window.

Double-glazing advantages

Many advantages of double glazing make it a desirable option for homeowners. First of all, it offers superior insulation, minimising heat loss via windows and maintaining your home’s comfort. Second, double glazing effectively blocks outside noise by acting as a sound barrier. Finally, by making it more difficult for burglars to enter your home, double glazing can increase its security.

Cons of double glazed windows

Double glazing has certain disadvantages while being a common choice. First off, it might be costly, especially if you have to replace every window in your house. Second, installing double glazing might be more challenging than installing secondary glass, especially in older structures. Finally, since you must clean both glass panes, double glazing might make window cleaning more difficult.

Additional Glazing

A lesser-known insulation technique called secondary glazing involves adding a second pane of glass to the interior of an existing window. This adds another layer of insulation and can offer advantages similar to double glazing.

The advantages of secondary glazing

Secondary glazing is a desirable choice because of its many advantages. First, if you are only insulating a few windows, it may be more affordable than double glazing. Second, because it adds a second barrier between your home and the outside world, secondary glazing may be more successful at decreasing noise pollution than double glazing. Last but not least, secondary glazing is frequently simpler to install than double glazing, especially in older buildings where it may be challenging to remove the existing windows.

  • Issues with Secondary Glazing

Secondary glazing has certain disadvantages in addition to its many advantages. Secondly, if the existing windows are in bad shape, it may not be as effective at limiting heat loss as double glazing. Second, because there may be a visible space between the two glass panes, secondary glazing may not be as visually pleasant as double glazing. Furthermore, because secondary glazing does not result in a sealed unit, it might not offer the same level of security as double glazing.

Which is preferable, secondary glazing or double glazing?

The response to this query is based on the needs and circumstances specific to you. Double glazing is most likely the greatest option if you want the best soundproofing and insulation. But, secondary glazing can be a better choice if you’re on a tight budget or have older windows that are challenging to replace.

The choice between double glazing and secondary glazing should ultimately be made after carefully weighing the advantages and disadvantages of each technique as well as your unique demands and circumstances. It is advised that you consult a qualified installer if you are unclear about which approach is ideal for you.


For windows, double glazing and secondary glazing are two common insulation techniques. When deciding between them, it is important to take into account their distinct features even though they have some characteristics, such as the ability to lessen heat loss and noise pollution.

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