Tips & Advice

4 min read

Standard window sizes – which are used?

Written by

Kacper Szczypek

Reading Time: 4 minutes

Windows come in a wide variety of sizes and types. Some of them are commonly considered as standard window sizes whereas others seem to be less typical. For this reason, at Fenbro we often get questions about standard window dimensions and how they relate to your home joinery. Are your house windows common or should you order bespoke made-to-measure windows?

Our answer is simple. There is no such a thing as standard window dimensions. Whenever you decide on replacing old windows with new counterparts, you have to follow the measurements from your existing windows. Otherwise, this so-called typical window may occur too big or too small, causing both problems and extra costs. The same refers to buying new windows which always ought to fit the existing openings. Even if the design assumes installation of windows and doors of certain dimensions, don’t go for it without double-checking the measurements of the actual openings.

Standard window width and height – Why do other companies refer to “standard window dimensions”?

For many companies, the standard size of a window in cm or in ft is a point of reference. It helps to provide prospective customers with estimated costs of certain products before they ask for a sales quote. We also use common window sizes in order to show you how much certain windows may cost and how the price varies, depending on the type of the window and the way it opens.

All product descriptions on our website include a price list module. It’s explanatory, and it illustrates costs of  average window size for the following products available in our offer:

  • fixed windows,
  • tilt and turn windows,
  • double sash tilt and turn windows,
  • French doors.

What standard house window sizes do we use?

In our price list, we refer to the windows size of 1000 x 1000 mm. However, these are not the dimensions considered as the average window height and width in the UK. You will find the average window sizes for uPVC windows in the UK in the chart.

Average uPVC window height Average uPVC window width
Inches (in) Millimetre (mm) Inches (in) Millimetre (mm)
59 in 1500 mm 69.7 in 1770 mm
53.1 in 1350 mm 47.2 in 1200 mm
47.2 in 1200 mm 36 in 915 mm
41.3 in 1050 mm 24.8 in 630 mm
23.6 in 600 mm 19.2 in 488 mm
17.7 in 450 mm 69.7 in 1770 mm

What’s important, the size varies depending on the room and type of window you choose. For this reason, we always recommend not to take dimensions defined as standard, average or common for granted and always measure one’s own house windows before placing an order. We even prepared an article dedicated to the process of measuring the windows correctly.

Correct measurements are crucial when you wish to successfully install new or replace old windows in your home. Many people think that windows should be measured from the inside of the house, while the measurements should take place outside. The internal measurements are taken in order to ensure your external measurements are accurate. Use a good metal tape measure and remember to hold it taut while taking records.

Why are measurements so important?

At Fenbro, we don’t offer standard windows or doors. Each product is made to order. Thanks to this approach, we are able to provide you with high quality joinery that meets your needs and expectations in terms of:

  • technical parameters (thermal and noise insulation, number of panes),
  • functionality (type of a window, way of opening, extra accessories),
  • aesthetics (style, colour, finishing).

What’s more, by delivering made to order windows and doors, we can easily address more demanding projects of both new builds and renovated properties. On the other hand, in order to provide you with the right product, we need accurate measurements. If you don’t know how to take them, we will help.

Customers from Ireland can take advantage of the services offered by our Fitting Team. Once you choose the best window system for your home, our Team will visit you and ensure that the measurements you have given us are correct. At this point, you are able to place your order without the risk that the doors or windows you purchase won’t fit and will have to be replaced with products of different dimensions.

Standard sliding doors sizes – What are they?

Sliding doors – just like windows – come in many different sizes and styles. Again, we

shouldn’t be discussing “standard sizes” here. What we can discuss are the most frequent dimensions. However, we cannot guarantee that when following them, you will order sliding doors in the correct size. For this reason, we keep emphasising the need of measuring the doors before ordering. The same procedure refers to buying both new sliding doors and replacement sliding doors.

What is the standard for front door and sliding doors sizes?

As far as standard size doors are concerned, we can refer to 900 x 2100 mm for regular front doors, 3000 x 2100 mm for uPCV sliding doors and 4000 x 2100 mm for aluminium sliding doors. However, the dimensions given should be considered as exemplary, and they can’t replace the actual measurements.

Standard house window sizes: Small or big bedroom windows?

As we have already mentioned, the dimensions considered as standard differ from room to room. One of the most important inquiries that our Sales Specialists have to answer is the matter of standard sizes of bedroom windows.

For years, architects as well as homeowners, chose smaller windows for bedrooms and the bigger ones for home living areas. However, in the last 20 years, the trend has changed and larger bedroom windows have increased in popularity. What are the average bedroom window sizes now? Let’s look at the chart below:

Standard bedroom window sizes
Inches (in) Millimetre (mm)
24 x 36 in 610 x 914 mm
24 x 46 in 610 x 1168 mm
28 x 54 in 711 x 1371 mm
28 x 66 in 711 x 1676 mm
28 x 70 in 711 x 1778 mm
34 x 46 in 863 x 1168 mm
34 x 62 in 863 x 1574 mm

Again, don’t feel obliged to follow these dimensions in your house design or product order. At Fenbro, we can provide you with made to order windows for each area of your home. That gives you freedom to organise your space according to your needs as well as the original design of your property.

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