Bifold vs Sliding Door Cost Comparison

The short answer to "are bifold doors cheaper than sliding doors?" is no: at the same opening, a standard aluminium slider usually costs a little less than a bifold. A 3m aluminium bifold door set is around £3,150 – £4,670 installed, while a matching sliding door runs £2,500 – £3,500. This tool puts both prices side by side for your chosen size, material and tier so you can see the gap for your own opening rather than a headline range.

Pick the opening width, the frame material and whether you want bespoke or standard-market doors, and the calculator returns an installed cost band for each option plus a recommendation based on the width. Prices are graph-backed and VAT-inclusive, so they reflect what actually lands on the invoice.

What drives the price difference

The main lever is the frame material. Aluminium is the standard modern choice with slim frames and holds most of the large-opening market. uPVC is the budget option, with a 3m bifold at £1,950 – £2,800 and the equivalent slider cheaper again, though the frames are noticeably chunkier. Timber is the premium, period-property choice, and it is the one material where a slider does not undercut a bifold: a 3m timber bifold is £2,000 – £3,000 against £2,500 – £3,500 for the slider.

Size scales the total but not evenly. A large 4 to 5m aluminium bifold reaches £4,670 – £7,200, while the same-width slider stays lower at £3,500 – £5,500, so the saving from choosing a slider grows as the opening widens. At the top end, bespoke aluminium from specialist brands is a different market: bifolds at £8,000 – £18,000 and sliders at £7,000 – £15,000. If you want integrated blinds sealed inside the glass, add £3,500 – £7,000 on top of either.

A worked example

Take the most common setup for a rear kitchen extension: a 3m opening in standard aluminium. A 3-panel bifold lands at £3,150 – £4,670 installed. The 2-panel slider covering the same width comes in at £2,500 – £3,500, so the slider saves a few hundred pounds and gives a cleaner view when the doors are shut. Bifolds earn that money back only if you genuinely fold the full aperture open often, which in the UK climate most households do a handful of times a year.

Whichever you choose, pay at least part of the deposit on a credit card so Section 75 of the Consumer Credit Act makes the card provider jointly liable if the supplier folds before delivery. Order early too: the 10-16 weeks glazing lead time means the doors are usually the longest single wait in the structure phase.