Short answer: how much do bifold doors cost? It depends on eight things: the width of the opening, the number of panels, the aluminium system, the glass, the colour, the hardware, the threshold, and the building work and fitting around them. Two sets of aluminium bifold doors that look alike in a photo can be priced very differently once those eight are pinned down, which is why an honest figure only comes after a survey.
- Size and panel count set the base, because more panels mean more frame, more hinges and more running gear.
- Glass is the biggest variable after size: double or triple glazing, solar control and safety glass all change the price.
- Non-standard colours, upgraded handles and a flush threshold each add to the order.
- Forming or widening an opening is building work in its own right, and it often costs more attention than the doors.
- An accurate quote needs a measured survey of the opening, not a guess from a photo.
Why don’t bifold door prices online match each other?
Online bifold door prices rarely match because each one assumes a different opening, system, glass and fitting job. A headline figure for a “three-panel set” says nothing about the width, the glass, the colour or whether the opening already exists. Treat any number you see without a survey as a loose guide to someone else’s job, not yours.
1. How big is the opening?
The width and height of the opening set the starting point, because a wider opening needs more aluminium, more glass and usually more panels. Height matters too: taller panels need stiffer frames and heavier glass, and above a certain size a system may need extra reinforcement or a different profile.
2. How many panels, and how do they fold?
More panels means a higher price, because each panel brings its own frame, hinges, rollers and seals. For a given width you can often choose between fewer, wider panels and more, narrower ones. Fewer panels give you more glass and less frame; more panels stack into a smaller space when folded.
Configuration matters too:
- Fold direction: inward or outward opening, and whether panels stack to the left, the right or split both ways.
- Traffic door: a lead panel that opens like a normal door, so you can step outside without folding the whole set.
- Corner sets: doors that meet at a corner with no post are a more involved build and fitting job than a straight run.
3. Which aluminium system?
The system is the frame design itself, and better systems cost more because they use more engineering in the profile. Systems differ in sightlines (how much frame you see), thermal break design, the size and weight of panel they can carry, weather and security testing, and the quality of the running gear.
Smart Architectural Aluminium, for example, states that its systems have been tested to PAS 24, the British security standard for doors and windows. A system that has been through that kind of testing, and that carries large panels without sagging, sits towards the premium end. It pays you back in doors that still run smoothly years later.
4. What glass goes in the panels?
Glass is the largest variable after size, because the same frame can take very different units. The options that move the price most are:
- Double or triple glazing. Triple glazing improves thermal performance but adds weight, which can affect the system and hardware needed.
- Low-emissivity and warm-edge spacers, which help the door set meet energy rules.
- Solar control glass for south-facing openings that would otherwise overheat.
- Self-cleaning, acoustic or tinted glass, each an upgrade over a standard unit.
- Safety glass. Glazing in doors and low-level panels is in a “critical location” and must be toughened or laminated under Approved Document K. With bifold doors this applies to the whole set.
Energy rules also set a floor. In England, Part L of the Building Regulations sets a limiting U-value for replacement doors, which for heavily glazed doors in an existing home is 1.4 W/m²K (or an equivalent energy rating) in the 2021 edition. Rules differ in Wales and Scotland and are revised from time to time, so check the current edition for your property. Any door set fitted in England has to meet that limit, so the glass and frame must be specified to reach it.
5. What colour and finish?
Standard colours cost less than special ones. Aluminium is powder coated, so almost any RAL colour is possible, but white, black and grey are the usual stock finishes. A special colour means a separate coating run, which adds cost and time: at DVM, special colours add around 6 to 8 weeks to the order.
Dual colour (one shade inside, another outside) and textured or metallic finishes are further upgrades.
6. Which handles, locks and hardware?
Hardware is a smaller line than glass but adds up across a multi-panel set. Choices include handle style and finish, multi-point locking on the traffic door, concealed or exposed hinges, and the type of running gear. Heavier panels need heavier-duty rollers and tracks, which cost more. Colour-matched hardware can carry a premium over the standard finish.
7. What kind of threshold?
A standard raised threshold is the simplest and best for weather; a low or flush threshold costs more, both for the part and for the work around it. A flush finish between floor and patio looks good and helps with step-free access, but it needs drainage planned in so rainwater does not sit against the door.
For main entrance doors in homes built since 1999, the Planning Portal notes that a level threshold must not be made worse by the replacement. A rear bifold set is often not the principal entrance, but it is worth confirming at survey.
8. How much building and fitting work is involved?
Installation and building work can move the price as much as the doors, because no two openings are alike. Things that add to the job:
- A new or wider opening. Cutting into a wall or widening an existing one is structural work. It usually needs a new lintel or steel beam, often a structural engineer’s calculations, and Building Regulations approval under Approved Document A. That is separate from the doors and is normally arranged before they are ordered.
- Removing and disposing of the old doors or windows.
- Making good the plaster, reveals and floor finish around the new frame.
- Floor levels that need adjusting for the threshold.
- Access, such as a narrow side passage or an upper floor, which affects how the panels are brought in.
Replacing a door that is mostly glazed is also “controlled” work under the Building Regulations. Installers registered with a competent person scheme can self-certify it; otherwise it goes through building control, which takes its own time and fee.
How do you get an accurate price for bifold doors?
You get an accurate price by having the opening measured and the eight factors above agreed in writing. A sensible process looks like this:
- Send the basics. Approximate width and height, a few photos of the opening, the colour you have in mind and any glass you know you want.
- Get a first estimate. From your rough measurements, or after someone has visited to look at the opening.
- Final survey and measure. Exact sizes are taken on site before anything is made, because aluminium doors are made to measure and cannot be cut down later.
- Order and lead time. Once the specification is signed off, the doors are ordered and you are given a lead time.
- Fitting. The old doors come out, the new set goes in, and the opening is made good.
At DVM, bifold doors are supplied and fitted, not sold as a kit, so the quote covers the doors and the installation together. When comparing quotes, ask each company for the same specification line by line so you compare like with like.
Which choices give you the most for your money?
The choices that usually give the best value are the ones you notice every day: a good system that runs smoothly, glass suited to the direction the doors face, and a sensible panel count. Fewer, wider panels give more view. A traffic door saves folding the whole set every time you step out. Special colours and flush thresholds are worth paying for when they matter to the room, and easy to drop when they do not.
Browse our aluminium bifold doors to see the options, or compare them with sliding doors if your opening suits fewer, larger panes. When you are ready, request a quote with your rough sizes and we will take it from there.