Question 1

How much do aluminium bifold doors cost supplied and fitted in the UK?

Accepted Answer

A standard 2.4m 3-panel aluminium bifold installation typically starts around £4,200. Larger spans range from £5,400 for a 3.2m 4-panel set up to £8,200 or more for a 5m 6-panel architectural aperture, excluding additional structural lintel work.

Question 2

What is the price difference between uPVC and aluminium bifolds?

Accepted Answer

uPVC bifolds are roughly 20% to 25% cheaper than aluminium, with 2.4m spans starting around £3,300 fitted compared to £4,200 for slimline aluminium. Aluminium systems offer significantly slimmer sightlines and accommodate wider glass panels.

Question 3

How much does it cost to install an RSJ steel lintel for bifold doors?

Accepted Answer

Creating a new knock-through opening with structural calculation and an RSJ steel lintel typically adds approximately £1,500 to the total installation project.

Question 4

Are sliding patio doors more expensive than bifolds?

Accepted Answer

Minimalist ultra-slim sliding patio systems are generally more expensive than bifold doors, starting around £4,900 for a 2.4m aperture and rising to over £9,600 for 5m+ multi-track systems due to the large, heavy single glass panes.

System Type	2.4m (3 Panels)	4.0m (5 Panels)	Typical U-Value
Aluminium Bifold	~£4,200	~£6,700	1.1 - 1.2 W/m²K
uPVC Bifold	~£3,300	~£5,100	1.2 - 1.3 W/m²K
Sliding Patio	~£4,900	~£7,900	1.0 - 1.1 W/m²K

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