Double Glazing Costs

So that you can make an informed decision when it comes to buying double glazing windows and doors, here is a brief outline of some of the types of window, door, frame and glass available.

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Window Types

E.g. of a Casement Window

E.g. of a Casement Window

Casement Windows

Hinged on one side and opening away from the house, casement windows are a very popular type. Their simple design helps to ensure that an interior receives the most possible available light.

Example of a Tilt and Turn Window

E.g. of a Tilt and Turn Window

Tilt & Turn Windows

These cleverly-designed windows can both open to the side and from the top. They make a safe option if you have young children, as they can be left open at just a fraction – enough to let some fresh air in, but not enough to climb out of. Thanks to the top opening feature, they are also very easy to clean.

Example of a Georgian Window

E.g. of a Georgian Window

Georgian Windows

Featuring horizontal and vertical bars across the pane, this window type is so named because of its similarity to the windows used in Georgian homes. Their classic design ensures they fit well with most traditional style homes.

Example of Sash Windows

E.g. of Sash Windows

Sash Windows

Another classic window variety, a sash window can be opened by lifting a frame vertically. As well as fitting in well with older homes, sash windows are a popular choice because they don’t take up any extra space when open.

Door Types

Panel Doors

E.g of Panel Doors

Panel Doors

This is a catch-all term that refers to the standard single-leaf door used in most homes as exterior and interior doors. A range of options is available depending on how many glass panels your require.

French Doors

E.g. of French Doors

French Doors

This term usually refers to a pair of glazed doors that are hinged at each side and meet in the middle. They create a very large space to move in and out of when they are open, which makes them great for opening out onto gardens and patios. Traditionally, French Doors have multiple glass panels, called ‘lites’.

Sliding Doors

E.g. of Sliding Doors

Sliding Doors

The difference between these and French Doors is that Sliding Doors slide one panel over the other to open, whereas French Doors swing out. Both types can referred to as Patio Doors.

Bi Folding Doors

E.g. of Bi Folding Doors

Bi-Folding Doors

Another option for maximising the open space when the doors are open is the Bi-folding Door. As the name suggests, the panels are divided in two and connected by hinges. They are also known as Bifold Doors and Concertina Doors.

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Frame Types


Unplasticised Polyvinyl Chloride is the material most commonly used in double glazing window frames these days. Easy to clean, attractive in appearance and affordable: it is an extremely effective material for doors and windows, and is also available in ‘photo-finish’ wood effect colours.

Steel / Aluminium

Tough and comparatively lightweight, steel or aluminium can provide a slimmer frame but it may require a thermal break in the frame itself to prevent the occurrence of heat loss.


An excellent insulator and certainly an attractive option for window frames, wood needs a little more maintenance than other types of frame. However, if you use wood elsewhere on your home’s exterior, it pays to have window frames that match.


As their name suggests, composite frames are made of more than one material: often with a wooden frame on the inside which is protected with either plastic or aluminium.

Types of Glass

Float Glass

The clear glass that is the standard in most small to medium sized windows. In its production process the glass is poured into a bath of fluid tin, in which it rests flat – hence the name. This process ensures that the glass is very flat and has uniform thickness.

Tempered Glass

Three times stronger than normal glass, tempered – or toughened – glass has been treated with jets of freezing air. Often used in applications where safety is a key factor, it will shatter into thousands of small pieces if smashed. Tempered glass is also thermally stronger than ordinary glass.

Further options

Triple Glazing

More expensive than double glazing, triple glazing offers an extra level of insulation and is most commonly used in countries which experience severe winters, such as Norway and Sweden.


The name of this gas derives from the ancient Greek word for inactive. Argon’s lower convection means that it is more effective as an insulator than air – hence its application in between the sheets of glass in the most energy efficient windows.