Which is cheaper, sliding doors or bifold doors?

They are broadly comparable at typical domestic sizes. A 3-panel, roughly 3m opening runs £6,000-£11,000 for sliders and £7,000-£12,000 for bifolds, with the gap widening on larger, more complex openings.

Can I get the same view with bifold doors as sliding doors?

Not quite. Bifold panels are narrower to allow folding, so a closed bifold set will always show more visible frame across the same width than a sliding door with large fixed and moving panes.

Which is more secure?

Both can be specified with multi-point locking and PAS 24 hardware to the same standard. Security depends more on the specification and installation than on the fundamental choice between sliding and bifold.

Do bifold doors let in more draughts than sliding doors?

Well-specified bifolds seal properly and meet the same Part L requirements as sliders. In practice, sliding doors have fewer moving joints and can be marginally easier to keep consistently airtight over a long lifespan.

Can I combine sliding and bifold doors in one extension?

Yes, this is increasingly common: a wide sliding door section to frame a view alongside a smaller bifold section for full opening onto a terrace. It adds cost and complexity but gives you both benefits.

Product Comparisons

Sliding Doors vs Bifold Doors

Sliding doors and bifold doors solve the same basic problem, a large glazed opening onto a garden, in two genuinely different ways. Neither is the automatically correct answer.

4 min read

This is one of the most common decisions on any extension or new-build project, and it tends to get decided by whichever door a homeowner has seen most recently on television rather than by how the room and garden actually work. Both are good products. The right one depends on how wide your opening is, whether you want an uninterrupted view when closed, and how you actually intend to use the space.

We fit both regularly across Cumbria, from Lake District barn conversions to contemporary new builds, and the deciding factors are consistent across almost every project.

How they differ

Sliding doors run large glass panels horizontally on a track, so at least one panel is always in view, giving the widest possible uninterrupted glass panes when closed. Bifold doors fold back concertina-style into a stack at one or both ends of the opening, so when fully open the opening is almost entirely clear.

	Sliding doors	Bifold doors
View when closed	Largest possible uninterrupted panes	More frame lines visible per panel
Opening when fully open	Roughly 70-90% of the opening, one panel stays in the track	Up to around 90-95%, opening genuinely disappears
Typical width sweet spot	3-6m and beyond	Up to around 5-6m before stacking becomes bulky
Daily use	Effortless single motion, ideal for frequent use	Multiple panels to fold each time, slower for quick access
Typical cost (3-panel, ~3m)	£6,000 - £11,000	£7,000 - £12,000
Best suited to	Wide openings, framing a view, everyday use	Fully opening a room to a garden or terrace

The view question

If you have a specific view worth framing, whether that is a fellside, a lake glimpse or a well-designed garden, sliding doors generally win, because the fixed and sliding panels use large single panes with minimal visible frame. Bifold doors, with a frame roughly every 700-1000mm across the opening, break up a static view even when they are closed.

If the priority is removing the boundary between inside and outside entirely on the occasions you use it, such as a summer gathering, bifolds do that better than any sliding door can. The trade-off is a busier appearance the other 90% of the year when the doors are shut.

Practical daily use

Sliding doors are easier to use for quick, everyday access, one panel moves smoothly and there is nothing to fold or unlock along the way.
Bifold doors need every panel unlocked and folded in sequence, which is more effort for a single trip out to the bin.
Sliding doors sit flush and are easier to keep genuinely weathertight over decades because there are fewer moving joints.
Bifold doors have more hinges, more seals and more moving parts, which slightly increases long-term maintenance.

Which should you choose

Choose sliding doors if you have a view to frame, want the doors open and closed easily every single day, or your opening is wide, 4m and beyond, where bifold stacks start to look bulky and expensive relative to slider tracks.

Choose bifold doors if you genuinely want the wall to disappear for entertaining, your garden and room are designed around that fully-open moment, and you are less bothered by the busier appearance of the doors when shut.

Be honest about how often you will actually fold back six panels of bifold door on a wet Tuesday in November; for many households a slider gets used properly every day, while an ambitious bifold set gets opened a handful of times a year.