1
Why pricing is quoted per metre
Bi-fold doors are typically priced per metre width because the overall span, number of panels and track configuration all scale with the opening size. A typical UK bi-fold installation might range from roughly £1,000 to £2,000 per metre supplied and fitted, though this varies with frame material, glazing specification and number of panels. Per-metre pricing allows for a fairer comparison between different opening widths, though it should always be backed up by a full fixed quote rather than a rough multiplication.
2
Number of panels and configuration
A wider opening does not simply cost proportionally more; the number of panels and whether the configuration includes a traffic door affects both material and labour costs. More panels generally mean more hardware, more running gear and more complex installation, so a five-panel door across four metres may cost differently to a three-panel door of the same width. Discuss configuration options with your installer, as this affects both price and how the doors operate day to day.
3
Frame material: aluminium vs uPVC
Aluminium bi-folds generally cost more per metre than uPVC equivalents, reflecting slimmer sightlines, greater strength over long spans and a wider colour range. uPVC bi-folds can be a more budget-friendly option for smaller openings but are less commonly specified for very wide spans due to structural limitations. Your choice should be guided by the opening size, desired aesthetic and budget, rather than material alone.
4
Glazing specification and thermal performance
As with windows, glazing specification affects the overall cost per metre. Standard double glazing with a decent U-value suits most extensions, while enhanced acoustic or solar control glass adds a premium. Given the large glazed area of bi-fold doors, it is worth investing in a reasonable specification to avoid excessive heat loss or overheating, particularly on south-facing elevations.
5
Structural and groundwork considerations
Bi-fold installations sometimes require structural alterations, such as removing a supporting wall and installing a steel lintel, plus groundworks for a level threshold. These costs are separate from the door cost itself and can be significant, so it is essential to establish early whether your project involves structural work and to get that priced by a suitably qualified professional alongside your glazing quote.
6
Getting a realistic per-metre estimate
Because so many variables affect the final price, the most reliable approach is a free home survey where an installer can measure the opening, discuss configuration and specification, and provide a fixed written quote broken down clearly. This allows you to see the true cost per metre for your specific project rather than relying on generic online figures that may not reflect your property.
