Bifold interior doors fold in on themselves, using two or four panels per leaf. They sit between a single hinged door and a full concertina system. That makes them a popular middle-ground choice for wide openings that still need a defined, tidy fold when open.

How Bifold Interior Doors Work

Each bifold leaf is made of two panels, joined by a central hinge. Push the leading edge, and the panels fold flat against each other. The whole leaf then swings back against the wall, or into a frame recess. Most openings use one or two bifold leaves, depending on width.

2-Panel vs 4-Panel Bifold Doors

  • 2-panel bifold — one fold point per leaf. Simple, and suits narrower openings such as a cupboard or utility room.
  • 4-panel bifold — two fold points per leaf. Folds into a smaller stack, so it suits wider openings where you still want a compact fold when open.

More panels mean a tighter fold, but also more hinge points. That’s worth weighing against the smoother look of fewer, wider panels.

Bifold vs Concertina vs Sliding Doors

Bifold doors fold in pairs, not a long pleated run like concertina doors. So they suit medium-width openings best. For very wide openings, a concertina system usually folds into a smaller stack. For openings where you’d rather the door disappear flat against a wall, a sliding door is often simpler to fit.

Materials and Finishes

  • Moulded panel doors — budget-friendly, paintable, widely available in standard sizes
  • Solid timber or oak veneer — a heavier, higher-end finish, often left natural or stained
  • Glazed bifold doors — glass panels that let light through, similar in effect to interior glazed doors

Cost of Bifold Interior Doors

Budget moulded bifold sets typically run from £60–£150 per leaf, supply-only. Solid timber or glazed bifold doors cost more, often £200–£450 per leaf. Fitting usually adds £80–£200, depending on whether the frame and track need replacing too.

Frequently Asked Questions

Do bifold interior doors need a track on the floor?

Most use a top track only, with a floor guide pin rather than a full floor track. This keeps the threshold clear and easier to clean.

Can bifold doors be fitted to an existing hinged door opening?

Yes, in most cases. The opening height and width just need to match a standard bifold kit, or be close enough for minor trimming.

Are bifold doors as strong as a single hinged door?

They’re a little less rigid, because of the extra hinge points. For everyday internal use this rarely matters, but a solid single door still gives the sturdiest feel of the three options.