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What are the standard window sizes in the UK?

by Francesca Coleman Carr

It is important to remember that many people choose to create bespoke solutions for their window installations, however there are a range of British standard window sizes that many manufacturers adhere to. By using standard window sizes that keep within a certain range, people can buy and install windows more easily as there is not a wide variation between every window or frame type.

There are average window heights and window widths that will apply to a wooden window or UPVC sash window similarly. Timber windows fit within the same frame space so it is logical for standard window sizes to remain the same whatever the material of the window frame itself.

We are experts in window installation using many standard window sizes and install timber windows in addition to UPVC frames, you can contact us for a free quote for your installation. Here we will explore in a little bit more detail the standard window sizes in the UK.

window size

Average window height and window width in the UK

While UPVC windows can carry a lower cost than timber windows or frames that use other types of material, they usually share the same European or British standard window sizes and dimensions.

The standard window heights are as follows:

  • 450 millimetres (mm)
  • 600 mm
  • 1,050 mm
  • 1,200 mm
  • 1,350 mm
  • 1,500 mm

The standard window widths are as follows:

  • 488 mm
  • 630 mm
  • 915 mm
  • 1,200 mm
  • 1,770 mm

An important reason for why standard window sizes exist is because they must meet specific criteria to make sure that they fit brickwork that is of a certain length, usually between 215 mm and 300 mm. The size requirements come about from various forms of legislation and directives that aim to make building practices easier and more codified.

Certain types of windows do not necessarily have standards, because the properties and installations that use them vary in their design periods and the overall age of the building. In this case, manufacturers determine their range of sizes. Common size conventions for two popular window types that we specialise in, sash and casement windows, are listed below:

Common casement window heights are:

  • 890 mm
  • 1,119 mm

Common casement window widths are:

  • 635 mm
  • 736 mm

Common sash window heights are:

  • 609 mm
  • 914 mm
  • 1,219 mm
  • 1,524 mm

Common sash window widths are:

  • 914 mm
  • 1,219 mm
  • 1,524 mm
  • 1,829 mm
  • 2,134 mm

It is a point of contention as to what the standard historical measurements for sash windows is, as there are several eras that feature a variety of sizes – meaning that different buildings can have different sizes. However, it is possible to construct sash windows that fit almost any size frame.

Installing windows with British standard sizes in the UK

It is all very well having standard window sizes, but without a proper installation service, the windows will not be as effective to look at or use. Problems of a poor installation include draftiness and badly functioning locks or opening and closing mechanisms. Our team picks the best materials for all of our products, and they are available in window sizes that will fit the usual range of windows in the UK.

As part of our commitment to the environment we only use sustainable materials. Using sustainable sources for our windows is particularly important for our timber windows, as it is an especially finite resource and has strong implications on the environment. To this end, we are proud to be Forest Stewardship Council® (FSC®) certified. We also make use of eco-glazing to increase energy efficiency.

Our team will work with you and provide expert advice on what choices in terms of window sizes and materials will work best in your project. We will provide a swift installation service that has the following features:

  • suitable for your budget
  • reduces noise
  • increases security
  • uses UK-manufactured products

The windows we install are not only beautiful to look at and function effectively, our sash windows have very smooth opening and closing mechanisms, they will also add to your quality of life. Busy roads and noisy environments can be bothersome with certain types of windows, but the glazing we use will help reduce a lot of noise and pollution without compromising security.

We are experts in providing UPVC sash windows for a diverse range of installations, and also specialise in installing timber window frames. Our wooden window designs provide sash windows with a great sense of authenticity. We also specialise in casement windows made of UPVC or timber materials, as well as several types of doors.

We will provide a fast and accurate quote. This no-obligation quote will give you a very clear idea of the costs of your windows. Get in touch with our team to get a quote today.

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