Bifold door cost calculator

What drives bifold pricing?

The biggest single driver is material. uPVC bifolds start around £500/panel for the frame; aluminium roughly £900/panel; timber engineered hardwood £1,400+/panel. Material choice is also a long-term decision: uPVC has a 20–25 year service life, aluminium 25–30 years, timber 40–60 years.

Panel count and width compound. A 6-panel 5m aluminium installation will cost roughly 2x a 3-panel 3m one — not just because of more panels but because larger spans need beefier hardware and structural prep.

Glazing can be 5–15% of the total. Triple glazing adds insulation but isn't worth the cost in most UK climates unless you're in a very exposed location or going for Passivhaus standards. Solar control glass (films or coatings) is worth specifying on south-facing installations to prevent summer overheating.

Threshold matters less for cost than for accessibility. A low-threshold variant typically adds £350–£500 and is worth it for any installation with regular outdoor use.

Finish — standard colours (white, anthracite grey, jet black) are included. Any other RAL adds £200–£400. Dual-colour (different inside/outside) adds £400–£700. Powder-coated textured finishes (woodgrain effect, special metallic) can add £600+.

Installation typically adds £1,000–£2,000 depending on access, existing structure, and any required lintel work. The "supply only" route is cheaper but you take on warranty risk if anything goes wrong with the installation.

What this calculator doesn't include

Structural work — if you're widening an existing opening or installing into a new wall, a new lintel and the associated brickwork is typically a separate £800–£2,500. Internal making-good (plastering, decoration) and external rendering or rebrick around the new frame is usually £400–£1,500. VAT is included in our indicative figures.

For a real quote

This calculator gets you to within roughly ±15% of a fixed quote, which is enough to know whether your project budget is workable. For the actual quote, we need to see the opening — book a free site survey and we'll provide a fixed price within 48 hours.