Bifold door sizes: which size do you need?
Author: Richard Collins - Operations Director
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Before purchasing new bifold doors, getting accurate measurements and ensuring you choose the right size is crucial to avoid costly errors.
In this guide, we'll walk you through the steps to measure your space correctly and provide tips on standard bifold door sizes. We will also discuss the benefits of custom bifold doors.
In this guide:
This section will showcase all the standard UK sizes for bifolds in metres, feet and inches.
To ensure the perfect fit bifold, you will need to ensure the area is properly measured - this section will explain the best methods for measuring for a bifold door.
Certain suppliers may be able to provide custom bifold doors for your specific needs - this section will detail what to expect.
We answer common queries on bifold door sizes.
What are the standard sizes for bifold doors in the UK?
UK bifold doors are generally available in standard sizes. Both internal and external bifold doors have their own standard sizes. Luckily, there are sizing conventions for doors in the UK, which makes choosing a door easier for you when matching them to an aperture. Read more about measuring for a new bifold door here.
For UK bifold doors, the average standard height is 2074mm (6.8 ft) for internal bifolds and 2090mm (6.10ft) for externals. The width varies and this is what determines how many door panels you can have. There are differences between the standard sizes for internal and external bifold doors, as detailed below.
The standard sizes of internal bifold doors
The panels of internal bifold doors usually vary in width from 550mm to 900mm and you can choose between having a higher number of smaller panels or fewer larger panels to fit the aperture. Here are the standard internal bifold door sizes available:
| Metres | Feet (approx) | Millimetres |
|---|---|---|
| 1.2 | 4 | 1,200 |
| 1.5 | 5 | 1,500 |
| 1.8 | 6 | 1,800 |
| 2.1 | 7 | 2,100 |
| 2.4 | 8 | 2,400 |
| 2.7 | 9 | 2,700 |
| 3.0 | 10 | 3,000 |
| 3.6 | 12 | 3,600 |
Are you choosing a new internal bifold door? Read our full guide to finding the right internal bifold door here.
The standard sizes of external bifold doors
External bifold doors are only slightly taller than internal ones, being 2,090 or 2,100mm in general. Like internal bifold doors, the width varies greatly. Here are the standard external door sizes available:
| Metres | Feet (approx) | Millimetres |
| 1.8 | 6 | 1,800 |
| 2.1 | 7 | 2,100 |
| 2.4 | 8 | 2,400 |
| 2.7 | 9 | 2,700 |
| 3.0 | 10 | 3,000 |
| 3.6 | 12 | 3,600 |
| 4.0 | 13 | 4,000 |
| 4.2 | 14 | 4,200 |
| 4.8 | 16 | 4,800 |
| 5.0 | 16.5 | 5,000 |
| 6.0 | 20 | 6,000 |
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How to measure for a bifold door
As previously mentioned, you need to be accurate when measuring for a bifold door — be sure to measure the space twice to double check. Incorrect measurements not only make it difficult to fit the door, but they affect its security and energy efficiency, even if you are only out by a few millimetres.
When replacing an existing door
When replacing an existing bifold door, you can use the previous measurements. However, we recommend remeasuring to ensure the perfect fit. It’s best to remove the old door and the frame first before you begin your measurements. If this is not an option, then measure the brick work from the highest points and follow the below guidance.
With a new opening
Follow these steps to measure the space correctly:
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Make three separate measurements for the width — at the top, the middle and the bottom
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Make three separate measurements for the height — on the right, in the centre and on the left
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Subtract 10mm from the smallest measurements — to allow for the fitting tolerance.
You can also measure to ascertain if the opening is square — starting from one corner at the top and measuring down to the diagonal corner at the bottom. Then do the same for the other corner. If the opening is square the measurements should be +/- 2mm of each other.
Are you choosing the perfect bifold door for your home? Read our complete guide to choosing a new bifold door.
What are custom bifold door sizes?
The standard door sizes available may not necessarily suit your needs. If the fitting tolerance exceeds 10/15mm or if you want taller or wider apertures for example, you should consider a custom size. Most modern houses are built to certain specifications so a standard door size will fit, but if you have an older property or a unique layout, you will need a custom size.
The benefits of custom bifold doors
While a custom-made door is more expensive, there are several benefits:
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You will have a unique bifold door that has an impressive visual appeal
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The design can be specifically tailored to meet your preferences
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A perfect fit, no matter the size
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The lead time will be longer, but you’ll have a bifolding door that fits perfectly and makes a striking visual impact in your home.
Choosing a bespoke bifold door supplier also means you can choose the exact style, colour and accessories for your home. Vufold offers a bespoke service, so if you need a made-to-measure bifold door, simply use the contact page, call (01625 442899) or email with your specifications.
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Frequently asked questions
What is the best way to choose bifold doors?
When choosing a new bifold door, consider your priorities and your budget. Consider the design of your home and whether you would prefer a traditional or modern bifold door option. Remember to check the U-Values on a product before purchasing, which will indicate its thermal efficiency.
Should bifold doors open in or out?
This depends on the space you have available surrounding your doors, and which option would be more convenient for you. Read our guide to bifold door configurations here.
What material should you choose for your external bifold door?
This depends on your priorities when choosing a bifold door. If your priority is finding a strong and durable option, we recommend looking at our aluminium bifold door range. If you are looking for a rustic, traditional material, our timber bifold doors may be perfect for you.
About Richard Collins
Rick is an expert in lean practices and principles, and how they’re applied to manufacturing, warehouse, administration and management of the business. As an operations director he oversees all areas of the business ensuring they run as efficiently as possible and has worked his way up through virtually every department since he joined us 13 years ago.
Read more about Richard Collins