Window styles

Secondary glazing is available in a wide range of styles, designed to match the layout of the original window that the secondary is being fitted to.


Fixed secondary glazingFixed panels are the simplest style of secondary glazing. Typically they are used in front of fixed or out of reach windows that don’t need to be opened, or  in combination with other panels as part of a larger secondary window. They also lend themselves to all sorts of creative solutions, such as inspection windows and partitioning, and they can even be fitted directly to the individual leaves of original windows and doors.

Because fixed secondary panels don’t open at all, they offer excellent enhanced security for any window they are fitted to.



Liftout secondary glazingLiftout panels are the simplest form of opening secondary glazing. As the name implies, these panels simply lift out of their outer frame, allowing full access to the primary window behind. They’re ideal for providing occasional access (for cleaning and maintenance purposes) to windows that don’t open.

Liftouts are also useful in places where other types of secondary glazing won’t work, for instance on some bays and corner windows. They’re ideal when space is tight and sliding panels wouldn’t work or hinged panels could clash when opened. Liftout panels can also be useful on flat windows where there isn’t enough internal space for them to open into.



Hinged secondary glazingTop hung secondary glazingHinged panels are a popular form of secondary glazing. They are suitable for a wide range of window styles and provide full access to the primary window behind.

These panels can be hung from the sides or top, depending on the design of the window they are fitted to. When closed they are completely unobtrusive, with no transoms or mullions to interfere with the primary window’s sightlines.

Hinged panels are great for fire escapes, they provide full ventilation, and can be fitted with stays and turn-locks to fix them in the open and closed positions.

Because hinged panels open inwards, consider how much space there is in front of the window for them to open into. In particular, be careful when there is seating close to a window. Also, be sure to take account of curtains and blinds, as these may interfere with the windows opening.


Horizontal sliders

Two panel horizontal sliding secondary glazingHorizontal sliders are the most popular form of secondary glazing, as they are so versatile. Ideally suited for casement windows, these panels simply slide left or right to provide access to the window behind. They are available with two, three, four or five panels and don’t need any clearance to open. They are completely unobtrusive, and – because they are available with locks – offer enhanced security.

Horizontal sliders can be coupled into long runs, suitable for commercial ribbon windows. They also lend themselves to creative uses, such as serving hatches and even wardrobe doors – use frosted glass and mirrors for a stunning look.

Three panel horizontal sliding secondary glazing   Three panel horizontal sliding secondary glazing   Four panel horizontal sliding secondary glazing


Vertical sliders (sash windows)

Tilt-in vertical sliding secondary glazingVertical sliding secondary glazingVertical sliders fit over traditional sliding sash or modern ‘mock sash’ windows.

Vertical sliders have two sashes that slide up and down. They are designed to fit in front of traditional sash windows.  They use tensioned balances (the modern version of sash cords) to support the sashes, allowing you to slide them up and down with ease. The sash then stays in whatever position you leave it.

On top of this, balanced vertical sliders are available with tilt-in sashes. On this type of window, not only do the sashes slide up and down in the normal way, they also tilt inwards, as if hinged from the bottom. This allows you to clean the outside face of the sash glass from inside the building.

Vertical sliders are lockable, so they can provide enhanced security. They are completely unobtrusive, matching the lines of the original sash window, and they don’t need any clearance to operate. Vertical sliders with tilt-in facility are the most sophisticated type of secondary glazing available.

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How Incarnation can help…

In most cases the different styles of secondary glazing described above can be combined. This can help provide an exact, versatile and cost-effective match to the primary window. On top of this, all of the styles are available with a range of choices and options that make them suitable for almost any application.

For more information on the different options and styles available, contact us at Incarnation. We’ll be happy to discuss the possibilities and provide advice on the best styles to match your windows.