French doors are a pair of hinged doors that meet in the middle with no central mullion. For an opening between about 1.2m and 1.8m, they are usually the right answer — a bi-fold at that width is all frame and no glass.
Below about 2 metres, a bi-fold stops making sense. Two 900mm panels leave you with a frame every 900mm and a stack that eats a third of the opening. A pair of French doors at the same width gives you two clean panes and a fully open 1.6m gap.
They are also considerably cheaper, simpler, and have far less hardware to go wrong.
| Job | Typical cost |
|---|---|
| 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.
Roughly 1.2m to 1.8m for the doors themselves. Wider openings can still use French doors with fixed side lights either side — often a better look, and cheaper, than a bi-fold of the same width.
Either. Outward-opening saves internal floor space and sheds water better; inward-opening keeps the leaves out of the weather. Outward is more common in the UK.
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