A three-pane, three-metre aluminium bi-fold typically costs £3,800–£6,000 supplied and fitted. A four-pane, four-metre set runs £5,000–£7,500. Those figures are for the doors — the steel, the threshold and the making good are where budgets get broken.
Panel count drives cost more than width does — each panel adds hinges, a carriage, gaskets and labour. A 3m opening as three panels is cheaper than the same 3m as four narrow panels.
After that: glass (triple, acoustic or toughened all add), colour (dual colour adds 5–10%), threshold type, and whether you specify a traffic door. And the system itself — there is a real gap between a budget bi-fold and a premium one, mostly in the hardware and the gasket detail, and it shows up after five years rather than on day one.
| Job | Typical cost |
|---|---|
| Bi-fold door, 3 panes, approx. 3m supplied & fitted | £3,800 – £6,000 |
| Bi-fold door, 4 panes, approx. 4m supplied & fitted | £5,000 – £7,500 |
| Sliding patio door, 2 panes, approx. 3m supplied & fitted | £3,000 – £4,500 |
| French doors, approx. 1.5m supplied & fitted | £1,900 – £2,900 |
Ranges include VAT and installation. Final price depends on size, spec, access and site condition — a survey gives you a fixed number.
Typically £3,800–£6,000 supplied and fitted for a three-pane set, before any structural work. If a new steel lintel is needed, add roughly £800–£2,500 including building control.
Usually, and the gap widens with width. A bi-fold has more panels, more hinges and more hardware than a slider of the same size. At 3m they are close; at 5m the slider is normally the cheaper option.
French doors with fixed side lights, if the opening allows it — far fewer moving parts than a bi-fold and typically half the cost.
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