A bifold door folds to the side instead of sliding away, so the whole opening can be clear instead of half of it — from two to six leaves, made to measure.
Made to measure in uPVC or aluminium, in any RAL colour. Delivery to the UK is quoted with your offer.
What comparable projects cost, by material. This is a guide price from our own quote archive — not a quote and not a final price: the amount for your own sizes, profile, glass and colour is in the quote.
Our guide prices come from our own quote history, and this type has not come up in it for this profile. That is why there is no amount. Just request the quote: we work it out on your own sizes.
Uf from 1.50
Configure in aluminium and request a quoteThis is a guide price, not a quote and not a final price. The amount for your own sizes is in the made-to-measure quote, which you request through the configurator.
Choose the material and window type and enter the outside size. You see what a window of that size usually cost in our quotes. This is a guide price, not a quote: the real price for your window arrives within three working days in your made-to-measure quote.
In whole pounds, excluding VAT, import duties, delivery and fitting. Worked out with the price per m² of comparable windows in our quote archive; colour, glazing and layout can still move the amount.
Uf, frame depth and sightline come from the profile table. The corner section is the manufacturer's render of exactly this profile: for Aluprof always the same shot — closed corner, close up — and for Gealan the render of the S 9000 NL family. The maximum sash width is on every profile page.
Two panels that fold away together — the smallest bifold door, up to 2.05 m wide.
Request my quote
A traffic door plus two folding panels — the door every day, the whole set open in summer.
Request my quote
A pair of doors for everyday use, two panels that fold the rest away — up to 4.00 m wide.
Request my quote
A traffic door plus four folding panels — up to 5.00 m wide, with the door where you want it.
Request my quote
A pair of doors and four folding panels — the widest bifold door, up to 6.00 m.
Request my quoteA bifold door — in the trade also called a folding sliding door — is made of leaves that are hinged to each other and fold to one side like a concertina. That is the difference from a sliding patio door, and it is the only difference that really matters: with a sliding door at least one leaf always stays in the opening, with a bifold none does. If you want the garden and the room to become one space, this is the type that does it. If you mostly want light and a view with an occasional way through, a sliding door does the same for less money and with fewer moving parts.
Sizing works differently here from what you may be used to, and that is down to the leaves. From the Aluprof manufacturer's brochure (edition NL-06.2022) for the MB-86 Fold Line HD: a leaf is 700 to 1,200 mm wide and goes up to 3,000 mm high, weighs at most 120 kg, and up to eight can be joined. So don't think in one width but in leaves: how many fit, how wide you want them, and which side they fold to. What those figures mean together for your opening is a question for the manufacturer and not for us: what the manufacturer confirms for your opening is in the offer.
That leaf principle is in the price too, and it surprises people coming from windows. A window or a sliding door is priced per square metre; a bifold is priced per leaf. So two units with the same opening don't cost the same if one has four leaves and the other six — for the same area, the six-leaf door is the more expensive. If you want to come out cheaper, the question is not "how many metres" but "how many parts", and wide leaves cost less per running metre than narrow ones. The upper limit of 1,200 mm per leaf puts a brake on that straight away.
Two things the brochure does fix, and they decide your layout. The MB-86 Fold Line HD opens inwards and outwards: outwards keeps your floor space clear but needs room on the patio, inwards is exactly the other way round, and with six or eight leaves that is half a room of difference. And corner and panoramic configurations are possible, so two walls meeting at a corner can both open. With three chambers, 86 mm frame depth and 77 mm leaf depth, the profile is a relative of the Aluprof MB-86N we already supply: it shares the profile connectors, the seals and the accessories.
And then the honest part about the price. For a bifold we don't have a guide price yet: it comes from our own quote history, and there are no bifolds in it yet. What you can do: put one together in the configurator and send it as a request; the manufacturer prices it on your sizes and within three working days you hear from us — if it takes longer, you hear that within the same three working days. We supply two bifold profiles, the Aluprof MB-86 Fold Line HD and the Reynaers ConceptFolding 77; for the CF 77 Reynaers gives a Uf of 1.66 W/m²K, for the Fold Line HD we don't yet have that figure from the manufacturer, and a made-up number is worse than an empty field.
Bifold doors, folding sliding doors or concertina doors are names for the same thing: panels hinged together that slide and fold to one side in a track. We supply them in aluminium, with the Aluprof MB-86 Fold Line HD and the Reynaers ConceptFolding 77.
Our bifold doors are glazed external doors: each panel is an aluminium frame with insulating glass, made for the outside wall and not for inside. You choose the glass in the configurator.
Black bifold doors are possible: the aluminium is powder coated in a RAL colour of your choice, so black or anthracite too. You choose the colour in the configurator.
No form first: you watch your window take shape as you choose. The price follows in the quote, within three working days.
With a sliding door one leaf slides behind another, so at least one part always stays in the opening: you open half at most, a little more with three or four parts. With a bifold the leaves are hinged to each other and fold to the side like a concertina, so the whole opening can come clear. That is the reason to want one. What you pay for it is more moving parts — more hinges, more locking points, more adjustment — and pricing per leaf instead of per square metre. For a way through you use every day, a sliding door is calmer; for a wall that has to be fully open in summer, the bifold is the only type that does it.
That depends on the number of leaves and not on one maximum width. The Aluprof brochure (NL-06.2022) gives for the MB-86 Fold Line HD a leaf width of 700 to 1,200 mm, a height up to 3,000 mm, at most 120 kg per leaf and up to eight leaves. What that adds up to for your opening, we don't work out here. The configurator refuses a size the chosen profile cannot take; what the manufacturer confirms for your opening is in the offer.
Because a guide price with us comes from our own quote history, and there are no bifolds in it yet. We would rather show no figure than one that later turns out different — the same rule that means there is no price behind a form anywhere on this site. The price on your sizes comes from the offer: put the door together, send it as a request, and within three working days you hear from us.
Both are possible: the MB-86 Fold Line HD opens inwards and outwards, and that is a choice you make before ordering, not after. Folding outwards keeps your floor space clear but takes up the patio — with six or eight leaves that is a sizeable strip where you can't put anything. Inwards is exactly the other way round. Corner and panoramic configurations are possible too, where two walls meeting at a corner both open. Before you choose, look at where the leaves stand when folded, because that is the space you lose while the door is open.
Only aluminium: the MB-86 Fold Line HD we supply is an aluminium system. The weight of a leaf — up to 120 kg according to the manufacturer — on a hinged point is one of the reasons bifolds are generally made in aluminium or timber, and we don't sell timber. Both profiles we supply, the Fold Line HD and the ConceptFolding 77, are aluminium; you choose the colour in the configurator as with any other type.
The manufacturer's brochure for this system states no tested burglar-resistance class, so we don't claim one either. What a bifold achieves depends on the hardware on every leaf joint and on how it is fixed into the wall — exactly as with any other type. If the manufacturer has test results, we will add them.
Yes. Put the bifold together in the configurator and send it as a request; within three working days you hear from us with a quote for your sizes — and if it takes longer, you hear that within the same three days. There is no advance guide price for this type yet; the figure you decide on is in the offer.
More than a sliding door or a tilt and turn window, because every leaf joint is its own hinge point: with eight leaves that is seven hinges that have to stay free of dirt and keep folding smoothly. The track the stack runs in needs the same attention as with a sliding door.
Yes, via the offer: with us, ordering only happens once you have the offer, and with a bifold that is no different from a window. The only thing missing is the advance guide price; the offer itself comes within three working days, or within that time you hear when it will.
A glazed wall of panels hinged together that fold like a concertina to the side, so the whole opening can be cleared.
That depends on the profile and the glass. For the Reynaers ConceptFolding 77 the manufacturer gives a frame Uf of 1.66 W/m²K; for the Fold Line HD we don't have that figure yet. The U-value of the whole door is in your quote.
If the whole opening has to open, bifold doors. If you mainly use the doorway every day and want fewer moving parts, sliding patio doors.
We don't have a guide price yet, because there are no bifold doors in our quote archive so far. Bifold doors are priced per panel; the price for your size is in your quote within three working days.
Where we have a guide price, it is on the page, not behind a form — not a quote and not a final price; the amount for your sizes is in the made-to-measure quote.
Request my quote