Standard Bifold Door Sizes In The UK

External aluminium bifold doors are a fantastic way to bring a modern, stylish edge to your UK home.

With their durability, slim frames, and ability to let in plenty of natural light, they’re perfect for patios, gardens, or creating an open-plan feel.

But choosing the right size can be tricky with so many options out there.

This guide will help you understand standard sizes, configurations, and measuring tips to pick the perfect aluminium bifold door for your space in 2025—and show you how to get the best quotes from us here at Green Central.

Why Size Matters for Aluminium Bifold Doors

Aluminium bifold doors stand out for their strength and versatility, supporting larger panels and wider openings than many other materials.

Getting the door size spot-on ensures your door is energy-efficient, secure, and fits seamlessly into your home.

Whether you’re upgrading an old patio door or planning a new extension, knowing the standard dimensions and how they match your space is essential.

Standard External Aluminium Bifold Door Sizes in the UK

In the UK, similar to typical front door sizes, external bifold doors come in a range of standard bifold door sizes to fit most properties. Here’s the key info:

Height

Usually between 2090mm and 2100mm (around 6’10” to 6’11”). This height works with the tracks and suits typical external openings.

Width

Spans from 1800mm to 6250mm, depending on how many panels you choose. Aluminium’s strength allows for impressive widths—up to 6000mm or more in some cases.

Panel Width

Each panel ranges from 400mm to 1200mm, giving you plenty of flexibility.

Popular options include:

two panels: Starting at 1800mm wide, ideal for smaller spaces.
3-panel doors: Between 2400mm and 3600mm, a go-to for medium-sized openings.
5+1 or 6-panel doors: Up to 6250mm, perfect for wide garden views or big entertaining areas.

Most Common Bifold Door Widths in the UK

Millimetres (mm)	Metres (m)	Feet (approx.)
1,200	1.2	3’11”
1,500	1.5	4’11”
1,800	1.8	5’11”
2,100	2.1	6’11”
2,400	2.4	7’10”
2,700	2.7	8’10”
3,000	3.0	9’10”
3,600	3.6	11’10”

Pro Tip: If your opening doesn’t match standard sizes, custom options are available. Contact us at Green Central for the best quotes on tailored solutions.

How to Measure for Your Aluminium Bifold Door

Accurate measurements are crucial for a flawless fit. Here’s how to do it:

1.Measure the Height:

Take three readings (left, middle, right) from floor to top of the door opening. Use the smallest number to account for any unevenness.

2.Measure the Width:

Measure across the top, middle, and bottom, sticking with the smallest figure.

Add Track Clearance: Allow 10-15mm extra for the top and bottom tracks, a standard requirement for most UK installations.

3.Check the Door Frame:

Make sure your surrounding structure can handle the door’s weight—aluminium is light, but large setups need solid support.

For instance, a 3000mm wide by 2100mm high door opening might suit a 3-panel door, with panels around 1000mm each.

Choosing the Right Configuration

The number of door panels and their folding pattern (e.g., 3+3 or 5+1) impacts both size and practicality. Here’s a breakdown:

2 to 3 Panels (1800mm-3600mm): Best for smaller areas, folding neatly to one side.
4 Panels (3600mm-4800mm): A balanced option, often splitting 2+2.
5+1 or 6 Panels (4800mm-6250mm): Great for wide openings, with most panels stacking to one side and a single door for daily use.

Think about how much space you want to open up—larger setups create that coveted indoor-outdoor flow, ideal for summer gatherings.

Why Aluminium? Benefits for UK Homes

Folding doors offer slim sightlines for bigger glass areas and more light. They’re built to withstand the UK’s changeable weather, with low-maintenance finishes that resist warping or fading. Their strength also means larger sizes without sacrificing security – making them a brilliant choice for long-term value.

Want to know more? Read our what is a bifold door information guide for characteristics and other options.

Top Tips for Picking the Perfect Size

To fit your opening, standard sizes can save you money, but custom bifold doors are a great solution for unique spaces—reach out to us at Green Central for the best quotes.

When planning for stacking, keep in mind that panels stack when open, so you’ll need to check your space; for example, five 1000mm panels will stack to about 150mm with frames.

Be sure to mind building regulations, as UK rules might dictate specific sizes for safety or insulation, so it’s wise to double-check with a professional if needed.

For expert help, our team at Green Central is ready to guide you through sizing and provide competitive quotes tailored to your project.

Ready to Buy? Get the Best Quotes from Green Central

Once you’ve measured your space and picked a configuration, you’re ready to find the perfect door. A 2400mm opening might suit a 3-panel aluminium bifold, while a 5000mm span could call for a 5+1 setup.

At Green Central, we’re here to help you every step of the way—contact us today for the best quotes on high-quality aluminium bifold doors in custom sizes that transform your home with style and space.