If you're pricing up a set of bifold doors for a kitchen extension, garden room or patio replacement, the first thing you want is a straight answer on cost. 

The problem is, most suppliers won't give you one until they've got your contact details — and the figures you do find online range from teaser prices to premium-brand headlines that don't reflect what most people actually pay.

In 2026, a standard 3-panel aluminium bifold door installed in the UK typically costs between £3,150 and £4,670 all-in. uPVC starts lower at around £1,950–£2,800 fitted, while timber sits in the middle at £2,000–£2,800. Wider openings with more panels, structural work or premium brands can push the total anywhere from £4,500 up to £7,200+.

This guide pulls together verified UK pricing from actual trades platforms and manufacturers, breaks down where your money goes, and flags the extras that often get left out of the headline quote.

The frame material is the single biggest price driver. Two doors that look similar in a brochure can easily have a £2,000 gap between them once you dig into the spec.

Aluminium is the default choice for most extensions in 2026. The frames are slim (20–35mm sightlines), the finish lasts decades, and modern thermal break technology means energy efficiency now matches or beats uPVC. The trade-off is upfront cost.

Most mid-range aluminium systems (Smart Systems, AluK, Cortizo) fall in the lower half of these ranges. Premium brands like Origin or Schuco sit at the top end — you're paying for tighter engineering, smoother hardware and longer guarantees (Origin offers 20 years, most others offer 10).

uPVC is the budget route. It's roughly 30–50% cheaper than aluminium for the same panel count, but the frames are thicker (~70mm) which means less glass and a heavier visual profile. Colour choice is also more limited, and some cheaper profiles can expand and contract in extreme temperatures, affecting operation over time.

For a small kitchen opening where budget matters more than aesthetics, uPVC works fine. On anything wider than 3.5 metres, aluminium usually justifies the step up.

Timber suits period properties and conservation areas where aluminium would look out of place. Engineered wood is the most common spec now — it's stable, insulates well (U-value around 1.4 W/m²K), and avoids the warping issues of solid softwood. The catch is maintenance: expect to repaint or re-stain every 3–5 years.

Composite doors combine materials — typically a timber-effect exterior with an aluminium or GRP core. You get the look of wood without the upkeep, but you pay for it. Entry-level composite starts around £2,500 installed for 3 panels and can reach £7,000+ for larger configurations.

Beyond the material, several variables shift the final bill by hundreds or even thousands:

The hidden cost most people miss is structural work. If you're replacing existing patio doors, it's usually a straightforward swap. If you're punching a new opening into a load-bearing wall or widening what's there, you'll need a structural engineer (£300–£600), a steel lintel (£500–£1,500), and building regulations sign-off (£200–£500). Your installer should flag this — if they don't mention it, ask directly.

Labour for a straightforward 3-panel replacement typically runs £600–£800 and takes one day. A 5-panel set or anything involving structural work pushes labour to £800–£1,200 and can stretch to two days.

A professional quote should include removal of the old door, frame fitting, glazing, weatherproofing, internal finishing trim, and a FENSA certificate. What's often not included: scaffolding, structural engineer fees, building control applications, decoration, and skip hire. Clarify these before you sign anything.

Buying the doors separately and hiring your own fitter can save £500–£1,000, but it's not without risk. Bifold doors are heavy, the tolerances are tight, and poor fitting leads to draughts, stiff operation and water ingress. Most manufacturers' guarantees are also conditional on professional installation — DIY or an unqualified fitter can void it.

If you do go supply-only, make sure your fitter has specific bifold experience (not just general window fitting) and check that they'll honour the manufacturer's warranty terms.

For a typical 3-metre kitchen extension opening in aluminium, £4,000–£6,000 all-in is a sensible budget in 2026. That covers a mid-range system, standard double glazing, anthracite grey or black finish, and straightforward installation.

If you're set on a premium brand like Origin or Schuco, or you want triple glazing, a traffic door and a flush threshold, push your budget to £6,000–£8,000.

For uPVC on the same opening, £2,500–£3,500 is realistic.

And if structural work is involved, add £1,000–£2,500 on top of whatever the door itself costs.

Between £1,950 and £4,670 depending on material — uPVC at the bottom, aluminium at the top.

For most extensions, yes. The slimmer frames let in more light, the finish doesn't fade, and the operation stays smooth for longer. On a tight budget with a small opening, uPVC is perfectly adequate.

Usually not if you're replacing existing doors. If you're creating a new opening, widening one, or you live in a listed building or conservation area, check with your local council first.

Generally yes — particularly on rear elevations opening onto a garden. Estate agents routinely flag them as a selling point.

Aluminium: 20–30 years with minimal maintenance. uPVC: 15–20 years. Timber: 20+ years if repainted regularly. Composite: 20–25 years.