Most fitted bi-fold door installations cost between £2,500 and £9,000 in 2026, depending on the frame material, number of panels and glazing. This guide gives you typical fitted prices for uPVC and aluminium bi-folds panel by panel, plus everything you need to know before you buy.
What are bi-fold patio doors?
Bi-fold patio doors are made up of at least two panels that fold back to create one large opening. This door style is perfect for homes with limited space, as it does not need as much room to operate as traditional sliding patio doors.
Bi-fold doors can span large openings, bringing vast amounts of natural light into the property. The panels fold back on themselves in a zigzag or concertina effect when open, stacking neatly to one side.
How much is a bi-fold door in 2026?
A bi-fold door installation typically costs between £2,500 and £9,000 fitted, with very large aluminium sets going higher. The price varies depending on several factors:
- Size and shape of the opening, and the number of panels required
- Glass type used in construction (double glazed or triple glazed)
- Frame material (aluminium, uPVC or timber)
- Frame colour and finish
- Whether installation is included in the price
The table below shows typical 2026 guide prices for supplied and fitted bi-fold doors by number of panels. Anthracite grey and other non-white finishes usually add 10 to 20% to a uPVC price.
| Number of panels | uPVC, fitted | Aluminium, fitted |
|---|---|---|
| 2 panels | £2,900 to £3,700 | £4,200 to £5,400 |
| 3 panels | £3,900 to £4,600 | £5,400 to £6,800 |
| 4 panels | £5,000 to £5,900 | £6,800 to £8,300 |
| 5 panels | £6,100 to £7,200 | £8,200 to £9,800 |
| 6 panels | £7,300 to £8,600 | £9,600 to £11,500 |
These are typical guide prices for standard-height doors with double glazing. Triple glazing, integral blinds and bespoke colours all add to the cost. For a smaller glazed opening, compare these figures with our patio door cost guide and uPVC door cost guide.
Could you qualify for funding towards new windows and doors? Homeowners with windows five years old or older can check in under 60 seconds. Launch the funding checker.
What is the process of installing a bi-fold door?
The first thing to check is that the lintel is in place and strong enough to support the weight above the opening.
If you want the opening to be considerably larger than it is now, there may be structural work as well as installation costs involved, and a structural engineer may need to be consulted at this stage. Where the aperture is being enlarged, this work is carried out before the installation team visits and requires a specialist builder. A good installer will manage all of this for you.
Installation varies depending on the doors you choose. Folding doors are usually installed with a factory-made frame, although some manufacturers weld frames on site to make them easier to transport. We do not recommend doors with welded or site-assembled frames: a frame produced and welded in the factory will be far more durable than the alternative.
What are some benefits of bi-fold doors?
Bi-fold doors are an excellent choice for homeowners looking to increase the energy efficiency, security and appearance of their home.
- Bi-fold doors come in double or triple glazed designs, which means they keep your home warm during the winter months and cool during the summer.
- Bi-folds can provide better security than hinged patio doors because more panels can be locked, and a multi-point locking system and internally beaded frames provide additional protection.
- Bi-fold doors are a great way to improve the appearance of your home, as they come in various materials and finishes.
- Bi-fold doors provide easy access to your garden or patio area and create a seamless transition between the indoors and outdoors.
What should I look for when choosing bi-fold doors?
- The size and shape of the door opening: bi-fold patio doors come in various sizes, so make sure you choose a configuration that fits your opening correctly.
- The type of glass used in construction: double or triple glazed folding doors will be more energy efficient.
- The frame material: aluminium, uPVC and hardwood frames are all options, each with its own benefits and drawbacks.
- Whether installation is included in the price: some local installers include fitting in their quote, while others charge separately.
What are the disadvantages of bi-fold doors?
- Bi-fold doors are more expensive than hinged patio doors.
- Exterior bi-fold doors require professional installation, which adds to the cost.
- In some cases, panels can stick when opened and closed frequently, especially if the doors were not installed correctly. This problem may need to be fixed by a specialist company.
Is planning permission required?
Bi-fold doors do not normally require planning permission, as they are classed as a door rather than a window. However, if you live in a conservation area or your home has listed status, you may need permission from your local authority before installing them.
If you live in a period property or listed building, or you are worried about planning, give your local council a call to discuss your options before committing.
Will bi-fold doors add value to my house?
Bi-fold doors are an excellent renovation choice for homeowners looking to add value to their properties. Adding a bi-folding door improves the look and feel of the property inside and out.
If there were two identical houses for sale but one of them had a beautiful set of bi-fold doors, the one with the bi-folds would usually attract more interest from buyers and often a stronger offer. Natural light and a good connection to the garden are high on most buyers' wish lists.
Aluminium bi-fold doors vs uPVC bi-fold doors
Aluminium bi-fold doors are a popular choice as they are strong and lightweight. They do not rust, corrode or discolour over time, and they can be powder coated in almost any colour, so you will have no problem finding a design to match your property.
On thermal performance, aluminium bi-folds compare favourably with their plastic counterparts: a typical aluminium bi-fold achieves a U-value of around 0.88 W/m²K against 0.93 W/m²K for uPVC. Aluminium frames are also typically stronger and less likely to move or warp than a uPVC frame, which matters on wide spans. Fitted aluminium bi-fold prices start from around £4,200 in 2026.
uPVC bi-fold doors are the most affordable type of bi-fold on the market and come in a wide range of styles and colours. They have high thermal insulation values, need no painting and very little maintenance, and many come with long manufacturer guarantees, often ten years. For smaller openings of two or three panels, uPVC offers outstanding value.
| Frame material | Typical U-value | Fitted prices from (2026) |
|---|---|---|
| Aluminium bi-fold doors | 0.88 W/m²K | £4,200 |
| uPVC bi-fold doors | 0.93 W/m²K | £2,900 |
Which is better, sliding doors or bi-fold doors?
Sliding doors require huge glass panels to cover the same area as folding doors. These large toughened glass panels can be cumbersome, which takes a toll on the mechanical parts of a sliding door over time.
While there is certainly a place for sliding doors, bi-fold doors are much better suited to larger openings because they fold back to open up almost the entire aperture. All doors are fitted with toughened safety glass as standard, which adds a considerable amount of weight to the frames, so quality running gear matters whichever style you choose.
What funding is available for bi-fold doors?
Qualifying homeowners may be able to access funding options towards new doors through the Help 2 Buy Windows grant scheme, from reduced prices to flexible payment plans. The Help 2 Buy Windows grant has nothing to do with the UK government; it is funded 100% by Help 2 Buy Windows through the sale of leads to our clients.
To get an accurate idea of what your project will cost and what you could qualify for, complete our 60-second funding checker or call our team to arrange a no-obligation quotation.
Finally, to sum things up
Bi-fold doors are an excellent renovation choice for homeowners looking to add value to their properties. When choosing bi-fold doors, consider the size and shape of your door opening, the type of glass used, the frame material and whether installation is included in the price.
If all this sounds intimidating, call our expert team to discuss your options and find the perfect bi-fold doors for your home, or complete the funding checker to see if you qualify for any grants, funding or incentives available.
Frequently asked questions
How much do bi-fold doors cost in the UK?
Most fitted bi-fold door installations cost between £2,500 and £9,000 in 2026. A white uPVC two-panel set starts at around £2,900 fitted, while large aluminium sets of five or six panels can exceed £10,000. The final price depends on the size, frame material, glazing and colour.
Are aluminium bi-fold doors worth the extra cost over uPVC?
Aluminium bi-fold doors cost more but offer slimmer frames, greater strength and a marginally better U-value (around 0.88 W/m²K against 0.93 W/m²K for uPVC). They are less likely to move or warp over time, which matters for wide openings. uPVC remains the more affordable choice for smaller openings.
Do bi-fold doors need planning permission?
Usually not. Bi-fold doors are classed as a door rather than a window, so planning permission is not normally required. If you live in a conservation area or a listed building, check with your local authority before installing them.
Will bi-fold doors add value to my house?
Yes, bi-fold doors are an excellent renovation choice for adding value. They improve the look and feel of a property, flood living spaces with natural light and create a seamless connection to the garden, all of which appeal strongly to buyers.
Which is better, sliding doors or bi-fold doors?
Bi-fold doors are usually better suited to larger openings because they fold back to open up almost the entire aperture. Sliding doors need very large glass panels to cover the same area, which puts more strain on the running gear over time. Both are fitted with toughened safety glass as standard.
Is there funding available for new bi-fold doors?
Qualifying homeowners may be able to access funding options towards new doors through the Help 2 Buy Windows grant scheme, including reduced prices and flexible payments. The Help 2 Buy Windows grant has nothing to do with the UK government; it is funded 100% by Help 2 Buy Windows through the sale of leads to our clients.