Bifold Doors Cost Guide: What to Budget For

Straight answers first

Are aluminium bifold doors always more expensive than uPVC?

Generally yes, aluminium costs more than uPVC for a bifold set, but it allows slimmer frames and larger glass panes, which many households find worth the extra for a wide opening.

How many panels do I need for my opening?

This depends on the total width and how you want the doors to stack, a survey will confirm the best configuration for your opening rather than guessing from a standard chart.

Does a low threshold cost extra on a bifold door?

Yes, a low or level access track typically adds cost over a standard threshold, but it is a popular upgrade for step-free access onto a patio or garden.

Do I need planning permission for bifold doors?

Most replacement bifold installations do not need planning permission, but any widening of the opening or structural alteration should be checked, particularly on listed or conservation area properties.

What is the cheapest way to get bifold doors?

Keeping to a standard threshold, a modest panel count, and uPVC frames keeps costs towards the lower end, while wider aluminium sets with structural changes sit at the higher end.

Does the quality of the rollers really make a difference?

Yes, better rollers and track hardware keep the panels running smoothly for longer, particularly on wider sets, so it is worth asking what running gear is included rather than assuming all systems are equal.

Do I need to tell my insurer about a new bifold door opening?

It is sensible to mention structural changes to your insurer, and having the work certified under a scheme such as CERTASS gives you paperwork to support that conversation.

What decides the price of a bifold door

Bifold doors fold back concertina-style, and the price scales with almost every dimension of that folding system, the number of panels, the width of each one, the frame material, and how the whole assembly is set into the structural opening. Because of this, bifold quotes tend to vary more between properties than a standard window or single door would.

Panel counts and configuration

A three-panel set covering a modest opening will always cost less than a five or seven-panel set spanning a wide extension, simply because there is more frame, more glass and more hardware involved. The configuration also matters, whether the doors stack to one side or split to open from both ends, since this can affect the track and hinge hardware needed.

uPVC vs aluminium

uPVC bifold doors are generally the more budget-friendly option and perform well thermally, but the frame sightlines are typically chunkier because the material needs more bulk for strength over a wide folding panel. Aluminium bifold doors cost more but allow much slimmer frames for a given size, giving a larger proportion of glass to frame and a more contemporary look, which is why aluminium tends to be the preferred choice for wide openings onto a garden or patio.

Glass specification

Standard double glazed units are the usual starting point, but many households upgrade to solar control or acoustic glass for a bifold set given how much glass area is involved. Larger individual panes also cost more to manufacture and handle safely, which feeds into the overall price on wider configurations.

Thresholds and structural opening

A low or level threshold track adds cost over a standard raised sill but is popular for step-free access onto a patio. The state of the existing structural opening matters too. If a wall needs to come out or a steel lintel needs installing to create or widen the opening, that structural work is a separate and often significant cost on top of the doors themselves, and should be scoped out at survey stage.

• Low threshold tracks add cost but suit step-free access
• Structural alterations such as new lintels are priced separately from the doors
• Wider individual panels need reinforced hardware and cost more per panel than narrower ones

Installation factors

Access to the rear of a property affects labour time and sometimes requires additional protection for gardens, patios or neighbouring properties during the fit. Removing an existing patio door, French door or window to create the bifold opening, along with any making good to brickwork, render or internal plaster, is generally included as part of a full installation quote but is worth confirming is itemised.

Typical price bands

As a broad guide only, a three-panel uPVC bifold door set of modest width supplied and fitted commonly starts from around £2,500 to £4,000. A wider five-panel uPVC set often runs from around £4,000 to £6,500, while aluminium bifolds of similar configuration typically sit higher again, often in the region of £5,500 to £9,000 or more depending on width and glass specification. Any structural opening work is on top of these figures. These ranges move with size, access and finish, so a free survey with a fixed written quote is the only way to get a number that reflects your actual project.

Hardware and running gear

The rollers, hinges and track are what make a bifold door feel smooth or stiff to operate day to day, and this hardware is a genuine area where spending a little more pays off. Better quality rollers run more smoothly under load and tend to need less adjustment over the years, particularly on wider panels where more weight is being carried on the track. Cheaper hardware can develop a heavier action or a slight drop in the panels sooner, so it is worth asking what running gear is specified rather than assuming all bifold systems use the same components.

Handles and locking points also vary between ranges, with better specified bifold systems locking at multiple points along the height of the door leaf rather than relying on a single point, which matters both for security and for keeping a long door leaf running true in its track.

Insurance and building considerations

Widening an opening for bifold doors, particularly on a rear elevation, can affect your home insurance if not declared, and most insurers simply want to know that the work was carried out to building regulations standards by a competent installer. Work carried out and certified under a scheme such as CERTASS gives you paperwork confirming compliance, which is worth keeping with your household documents alongside your guarantee.

If the bifold doors are part of a wider extension project, it is also worth checking whether building control sign off for the extension itself covers the door opening, or whether the door installation needs its own separate certification.