Bifold Door Sizes UK: Standard & Custom Options

Getting the right bifold door size is one of the most important decisions when planning a home renovation. The correct dimensions affect how much light enters your home, how your room looks and how easy it is to move furniture or even navigate with mobility aids.

Pick an internal door that’s too narrow or too short, and you could end up with a cramped, awkward layout. Go too large without planning, and you might face costly adjustments or installation challenges.

In this guide, we’ll answer questions like, “How do I measure a bifold door?”, “What is the standard bifold door size?” and “Can I get a custom size for my space?” – giving you all the insights you need to choose the perfect bifold door for your home.

How to Measure a Bifold Door

First things first: getting an accurate measurement is key to ensuring your bifold door fits perfectly and operates smoothly. Even a small miscalculation can cause issues during installation, which is why we recommend working with an experienced team like Bifold Shop.

Here’s a step-by-step process for measuring bifold door openings:

1. Measure the Width – Measure the width of the opening at the top, middle and bottom. Use the narrowest measurement as your reference to make sure the door will fit without binding. Don’t forget to account for the frame, trims and any skirting boards that might reduce the actual space. We advise allowing some tolerance to your smallest width for fitting (between 5mm and 15mm).
2. Measure the Height – Measure from the floor to the top of the opening in at least three spaces: left, centre and right. If your floors aren’t perfectly level, use the shortest height as your guide. For accessible bifold doors, pay extra attention to the threshold to avoid creating a step that could be a trip hazard. Again, we advise allowing for tolerance for fitting (5mm-15mm).
3.  Measure the Depth – Check the depth of the wall where the door will sit. This is especially important for flush-mounted or recessed frames. Make sure there’s enough room for the folding panels to stack neatly when the door is open.

Top Tips: Here are a few additional tips from our experts to get that perfect fit:

• Use a steel tape measure or laser for accuracy
• If your walls aren’t straight, measure in multiple spots and note any variations
• Double-check your measurements
• Our professional surveyors can help verify dimensions to avoid costly mistakes

What is the Standard Bifold Door Size UK?

In the UK, most bifold doors come in standard widths and heights to make installation easier, keep costs reasonable and provide a wide range of options for homes.

Standard bifold doors are widely used because they’re cost-effective, as they’re manufactured in bulk, making them significantly cheaper than bespoke options. They’re also readily available from our team, which means we can deliver your bifold door installation with minimal lead times. On top of that, using standard measurements makes fitting the doors simpler, reducing the risk of errors, adjustments or delays during installation.

Standard Bifold Door Sizes in the UK

Number of Panels	Standard Size of Bifold Doors (mm)	Best Use Case
2	1400 x 1900	Small rooms, kitchens, offices, en-suites
3	2200 x 3500	Medium openings, living-dining connections
4	3200 x 4400	Large open-plan rooms, gardens, family rooms
5	4000 x 5500	Extensions, external bifold doors
6	5000 x 7000	Extra wide garden or patio doors, large open-plan spaces

What’s the Minimum Bifold Door Size?

The minimum, small bifold door size is around 1400 x 1981mm. These smaller doors work well for wardrobes, internal partitions or smaller home offices where space is perhaps limited.

What’s the Maximum Bifold Door Size?

For large openings, bifold doors can span up to 10 meters or more, with multiple panels. These are perfect for external garden doors or wide living spaces, giving uninterrupted access, maximum light and flexible layouts.

Using a standard size bifold door is ideal for most rooms, but your home may benefit from custom sizing if your space is unusual, you want extra-wide openings or you’re integrating doors into a garden or external area.

Custom Bifold Door Sizes

In reality, there is no generic bifold door size. Every bifold door is manufactured specifically for each project, meaning that often, no two doors are the same!

Bespoke or custom bifold door sizes therefore give you the flexibility to create openings that perfectly suit your space, whether that’s an unusually wide patio, a loft conversion or a small corner that needs some special attention. 

At Bifold Shop, we’ve supported our clients with bespoke bifold doors for a number of reasons. You name it, we’ve seen it:

• Unique Room Dimension – Irregular or extra-wide openings may require panels that standard sizes can’t accommodate.
• Architectural Features – Conservatories, lofts or extensions often have bespoke measurements.
• Aesthetic Preferences – Matching the proportions of existing windows, doors or design elements may call for custom sizes.

If you’re measuring for custom bifold doors, here are a few additional tips to help your accuracy:

• Measure the width and height at multiple points to account for uneven walls or floors.
• Include space for the frame, trims and threshold in your measurements.
• Check that the panels will fold and stack correctly within the chosen opening.
• Consider how the door will interact with existing furniture, radiators and appliances.

For bespoke solutions, it’s always worth contacting a professional bifold door installer, such as our team. We can provide you with an accurate quote and ensure your internal doors are fitted to a professional level, with no damage to your surrounding home.

Factors to Consider When Choosing Bifold Door Sizes

If you’re still deciding on the right bifold door size for your property, here are some key factors to keep in mind:

• Function of the Room – Is this bifold door for a high-traffic area, a living space or a garden room? Internal doors in smaller rooms may benefit from fewer panels, while large, patio bifold doors may need 4-6 panels to maximise light and accessibility.
• Accessibility Needs – If you need a wheelchair or mobility aid access, ensure each panel and the overall opening provide enough clearance. Level or flush bifold door thresholds are particularly important in these cases.
• Aesthetic and Style – The door size affects proportion, balance and sightlines in your home. Think about how the bifold door widths, bifold door height and number of panels complement windows, walls and other architectural features.
• Future Flexibility – Consider whether you want the option to open the space fully for entertaining or leave part of the door closed for privacy or temperature control. The right size and configuration will make this easier.

Get the Perfect Fit: Bifold Doors from Bifold Shop

Choosing the right bifold door size will have a huge impact on the overall look of your space. The right measurements and materials ensure your door functions beautifully while improving your interior scheme.

If you’re ready to see your size options in person, visit our NEW bifold door showroom to explore our full range of systems. Our experts will be there to provide personalised advice, help you measure your space accurately and guide you towards the perfect solution.

Alternatively, you’re always welcome to get in touch or request a quote today to start planning a bifold door that’s the perfect fit for your home.