Bi-fold doors have emerged as the best way to connect your indoor living space to the outdoors.
Consisting of a set of glass panels, framed by strong aluminium, bifold doors open by folding back on themselves in a concertina style (or like a paper fan), meaning they can remove a wall completely.
The panels move on tracks that can be fitted flush to your floor, so there’s no trip hazard. They stack neatly in one corner, so you can enjoy dining on your sofa with a summer’s breeze, hear birds sing whilst having breakfast, or conveniently pop in and out if you’re hosting a barbecue.
When closed, the doors tightly seal to the frames to ensure minimal heat transfer. You get a plethora of natural light because of the large glass panes, and can enjoy the low-maintenance yet long-lasting benefits of using aluminium. Sound good? We explore bi-folds in more detail below, as well as noting vital considerations when it comes to actually investing in them for your space.
What are bi-fold doors?
A bi-fold door is made up of several door panels hinged together. As you open them, the panels fold flat against each other like the bellows of an accordion and slide along a track to one side of the opening.
Here’s how they work in practice:
- Panels: Most homes choose between 2 and 7 panels per opening, depending on the width of your opening. Each panel can be up to 1200mm wide.
- Traffic door: Odd-numbered layouts (like a 3-panel set) can include a traffic door, sometimes called a pass door. This works like a normal single door, letting you nip out to the garden without folding the whole set away.
- The track: Our doors are bottom-running systems, meaning the weight of the doors rides on a heavy-duty carriage along the bottom track. This gives a smooth, single-handed glide.
- Handles and locks: A handle operates the lead panel, while concealed shoot-bolts lock the intermediate panels firmly into place.
When closed, the panels sit flush with perfectly uniform sightlines. When open, they tuck away to reveal an uninterrupted opening.
Bi-folds are often confused with sliding patio and French doors, so we’ve compared them below.
| Feature | Bi-fold doors | Sliding patio doors | French doors |
| Opening mechanism | Fold and stack to one side | Glide past each other | Swing open on hinges |
| Swing space needed | Minimal (folds inward or outward) | None | Requires clearance to swing |
| Opening size | Up to the full width | Around half the width | Limited to two panels |
| Sightlines when closed | Slim frames between panels | One or two larger panes | Slim central meeting point |
What are the benefits of bi-fold doors?
Bi-fold doors have become an increasingly popular choice for high-end UK homeowners, and it’s easy to see why.
Slim sightlines
Our premium aluminium profiles share the same front-to-back depth on the sash and outer frame, giving balanced, flush sightlines and more glass.
External views
With fewer frames in the way, you get clear, panoramic views of your garden all year round.
Natural light intake
Larger glazing areas mean more daylight pouring into your living space, brightening even north-facing rooms.
Easy operation
The bottom track and smooth carriage system let you open a whole wall of glass with one hand.
Increased home value
Quality bifold doors are a strong selling point and can significantly add to the value of your home should you ever wish to sell.
Built-in finger protection
Soft-cushioned gaskets sit between the panels, so little fingers stay safe as the doors open and close, giving parents real peace of mind.
What makes aluminium the material of choice for bifold doors?
Aluminium is a lightweight metal prized for its strength-to-weight ratio. Unlike timber, it won’t suffer insect damage or worse, change shape over time, which makes it ideal for UK conditions.
- Durability: Aluminium doors can last several decades with proper care.
- Strength: Inherently tough and resistant to forced entry.
- Easy cleaning: A simple wipe keeps them looking smart.
- Customisation: A huge range of RAL colours, finishes and glazing.
- Thermal performance: A thermal break (an insulating barrier inside the frame that stops heat escaping) keeps your home warmer and your energy bills lower.
Are aluminium bifold doors energy efficient?
Yes. Our standard system features high-quality built-in insulation that achieves a U-value of 1.4 W/m²K, which easily meets all current building regulations.
If you want maximum efficiency, our high-performance Model profile reaches an outstanding U-value of 0.93 W/m²K. Remember, with U-values, the lower the number, the better the insulation. This premium option traps heat much more effectively, making it perfect for modern extensions and keeping your heating bills lower throughout the year.
What are the installation considerations of bi-fold doors?
Getting your new doors right takes a little planning. Here are the main things to think about.
Panel and door integration
Decide how many panels suit your opening and whether you’d like a traffic door for everyday access.
Colour
Choose from white, anthracite grey, black or almost any RAL shade. You can even pick a dual-colour finish, with one colour outside and another inside.
Glazing and opening direction
Opt for double glazing or triple glazing, then choose whether the doors fold inward or outward to suit your floor plan.
Price
As per Checkatrade, which is in-line with our usual pricing, aluminium bi-fold doors typically range from around £3,000 – £8,500 as a UK benchmark. The overall price depends on size, glazing, colour and configuration. We always offer competitive pricing with no compromise on the highest quality.
Professional installation
For an installation at the scale of bi-fold doors, professional installation is highly recommended. It requires experts to create structural openings, and ensures a perfect fit for ideal thermal performance.
Bi-fold doors from BSF Windows
Our range gives you the perfect fit for traditional homes and contemporary homes alike. You can choose:
- 2 to 7 panels per opening
- Double or triple glazing, plus solar-control and acoustic glass upgrades
- A wide palette of colours including anthracite grey, black, white and any RAL shade
- A traffic door for easy everyday access
- Multi-point locking tested to PAS 24, with Secured by Design available
- Finger-safe anti-trap gaskets as standard
- Standard or low-threshold bottom track options
Who are BSF Windows?
We’re a family-run window and door company with over 20 years of experience, serving Horley, Crawley, Guildford, Dorking, Brighton and surrounding areas across Surrey and Sussex. We supply and install windows, doors, conservatories, orangeries and roof lanterns, all backed by quality craftsmanship and thousands of successful installations.
You’re more than welcome to pop into our showroom at 31-33 Station Road, Horley, Surrey, RH6 9HW to see our doors first-hand. Ready for a free quote? Call us on 01293 408 713 or email bsfwindows@gmail.com. Let’s bring more light, space and style to your home.
