Doors · 7 min read · Updated 2026
Bifold vs sliding doors: which is right for your opening?
The honest answer depends on whether you value the opening in July or the view in January.
Opening area
Bifolds open around 90% of the aperture — the wall genuinely disappears. Sliding doors open a maximum of half (two panels) or two-thirds (three panels), because a panel must always slide behind another.
Sightlines when closed
This is where sliders win decisively. A slim-frame slider might show 35mm of interlock; a bifold shows a frame at every panel join. For most households the doors are closed far more often than open.
Practicality
Bifolds can include a traffic door for everyday use, which avoids folding the whole set back to let the dog out. Sliders always have one leaf that opens.
Stacked bifold panels need somewhere to go — allow for the stack width at the side of the opening.
Cost
Broadly comparable at three panels. Beyond that, large slider panels get expensive quickly because of glass weight and handling, while bifolds scale more gently.
Common questions
- Which is more secure?
- Both can be specified to PAS 24. Look for multi-point locking, anti-lift devices on sliders and laminated glass on either.