Windows come in a wide variety of sizes and types. Some are commonly considered standard window sizes, while others are less typical. At Fenbro, we often get questions about standard window dimensions and how they relate to your home joinery. It’s best to provide dimensions in millimetres (mm) and not in centimetres or inches, with the width first, followed by the height (width x height [mm]). 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 the 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 window 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 width | Average uPVC window height | ||
| Inches (in) | Millimetre (mm) | Inches (in) | Millimetre (mm) |
| 69.7 in | 1770 mm | 59 in | 1500 mm |
| 47.2 in | 1200 mm | 53.1 in | 1350 mm |
| 36 in | 915 mm | 47.2 in | 1200 mm |
| 24.8 in | 630 mm | 41.3 in | 1050 mm |
| 19.2 in | 488 mm | 23.6 in | 600 mm |
| 69.7 in | 1770 mm | 17.7 in | 450 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 request support from one of our trusted installation partners. Once you choose the best window system for your home, we can help arrange a visit from a professional who will verify the measurements before you place your order.
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.
Common window sizes in the UK and Ireland
When discussing standard window sizes in the UK and Ireland, it’s important to note that these sizes can vary significantly based on the architectural styles prevalent in different regions. For instance, standard window sizes UK might differ slightly from standard window sizes Ireland due to local building practices and historical influences.
In the UK, a commonly used standard size of window in cm includes dimensions such as 1200 mm x 1200 mm, 1500 mm x 1500 mm, and 900 cm x 1200 mm. Similarly, in Ireland, popular dimensions might include 1000 mm x 1000 mm and 1500 mm x 2000 mm. These measurements are often used for various types of windows, including sash, casement, and tilt and turn windows.
How are window sizes measured?
Accurate window measurement is crucial for ensuring a perfect fit for new or replacement windows. To measure a window correctly, follow these steps:
- Measure the width — measure the width of the window from the inside of the frame on one side to the inside of the frame on the other side. Take three measurements: top, middle, and bottom. Use the smallest measurement as the width.
- Measure the height— measure the height of the window from the inside of the frame at the top to the inside of the frame at the bottom. Again, take three measurements: left, middle, and right. Use the smallest measurement as the height.
- Depth measurement— measure the depth of the window frame, which is essential for certain window types.
When taking these measurements, ensure you use a reliable metal tape measure and hold it taut to get accurate readings. For more detailed guidance, refer to our dedicated article on measuring windows correctly.
FAQ — Frequently Asked Questions
How much does it cost to replace a door in the UK?
The cost of replacing a door in the UK can vary widely based on the type of door and the materials used. On average, replacing a front door can cost between £600 and £1,500, including installation.
How to replace a door in the UK?
Replacing a door involves several steps:
- Remove the old door and frame
- Measure the opening to ensure the new door will fit
- Install the new frame and door
- Seal and finish the installation
How much does it cost to install a uPVC door in the UK?
Installing a uPVC door in the UK typically costs between £600 and £1,200 (depends on the build — new build/renovation, or if this is a single door of with side panels), including both the door and the installation. This price range can vary based on several factors, including the specific design and features of the door, the complexity of the installation, and the region in which you live.
