If you have ever seen a whole wall of glass fold neatly to one side and open a kitchen straight onto the garden, you have seen a bifold door in action. They are one of the most popular ways to open up a home, but how do they actually work, and are they right for your space? Here is a plain guide to the folding, sliding action and what to think about.
A bifold door is a set of glazed panels joined together with hinges that fold back on themselves, concertina style, and slide along a track to stack neatly at one or both sides of the opening. Instead of a single door on hinges or two panels that slide past each other, a bifold is a run of several slim panels that move together as one.
When closed, a bifold door looks like a wall of glass with slim frames between each pane. When open, the panels fold flat against each other and glide out of the way, leaving most of the opening clear. That is what gives you the big indoor-outdoor feel people love.
Bifolds are a favourite for kitchen extensions, garden rooms and living spaces across York and North Yorkshire, wherever homeowners want to connect the inside to the outside.
The clever bit is in the track and the hinges. Here is what is going on:
Most bifolds also include a traffic door, a single panel that opens on its own like a normal door. That means you can nip in and out without folding the whole set back every time, which is handy day to day.
The doors run on either a top-hung system (where the weight hangs from the top track) or a bottom-rolling system (where the weight sits on the bottom track). Top-hung is common on quality installs because it keeps the bottom track slimmer and easier to keep clear.
Bifolds are made up of anything from two panels up to seven or more, depending on the width of your opening. The panels can be set to fold all to one side, or split so they stack at both ends. You can also choose which way the traffic door sits and which way the panels swing, so the layout suits how you use the room.
More panels means a wider opening, but each panel adds cost and weight, so there is a balance to strike. Our team fits aluminium bifold and sliding doors in a range of configurations and can help you work out the best layout for your space.
It helps to see how bifolds compare to the alternatives:
If you want the widest possible clear opening, a bifold is hard to beat. If you want maximum uninterrupted glass when closed and have a tighter budget, a slider may suit better. For a smaller, traditional opening, French and patio door options are worth comparing.
Most bifold doors are made from aluminium, because it is strong enough to carry large panels of glass on slim frames. That strength lets you have bigger panes and thinner sightlines, which is exactly what most people want from a bifold. uPVC and timber bifolds exist too, but aluminium is the usual choice for larger openings.
If you want a warmer, solid door alongside your glazing, for example a side or back door, our composite door range pairs well with a glazed bifold.
Bifold doors sit at the higher end of the door market because of the number of panels, the hinges, the track and the fitting involved. As a rough UK guide, a supplied-and-fitted aluminium bifold typically runs from a few thousand pounds upwards, rising with the number of panels and the size of the opening. Treat any online figure as a ballpark only. For a real price you need it measured, so it is worth getting it quoted. You can request a free quote and we will give you an honest number.
Openings that involve a new lintel or structural work should follow current Building Regulations, so check the latest rules with your local authority or leave the technical side to your installer.
The panels are hinged together and fold in a concertina, then slide along a track to stack at one or both sides of the opening. Most sets also have a single traffic door you can use on its own without folding the whole run back.
Most do, though the design keeps it as slim and flush as possible. Top-hung systems carry the weight from the top track, which lets the bottom track stay low and less of a trip hazard. A fully flush threshold is often an option worth asking about.
Yes, quality bifolds use multipoint locking and toughened glass, and the traffic door locks like a normal door. As always, the security depends on the quality of the hardware and the fitting.
It depends on the width of your opening and how you want the doors to stack. Wider openings take more panels, and you can choose to fold them all one way or split them to stack at both ends. An installer can advise the best layout once they have measured up.
A bifold door is a run of hinged glazed panels that fold and slide to stack neatly aside, opening up almost the whole span for a proper indoor-outdoor feel. They open wider than French or sliding doors, which makes them a favourite for kitchens and garden rooms. Want to see the configurations and finishes? Download our latest brochure, or get a free quote and we will come and measure up.