Who bi-fold doors genuinely suit, and who they do not
- Wide rear openings on extensions and open plan kitchen diners
- Households that genuinely open the doors fully in summer
- Openings over about 2.4 metres where a slider would leave half of it shut
- Projects where matching aluminium windows are being fitted on the same elevation
- The stacked panels sit somewhere, and they take up reveal space either inside or outside the opening
- It is the most expensive way to glaze an opening, and a slider often gives a better everyday view with less framing
- A bi fold needs a level, structurally adequate threshold, so on an older property the groundwork can be part of the job
