If you have started pricing up bifold doors, you will have noticed quotes vary wildly, from under £2,000 to well over £10,000. The honest answer is that the cost depends on material, size and what your opening needs structurally. Here is a realistic breakdown so you can budget properly before anyone visits your home.
For a standard three panel set around 2.4 to 3 metres wide, supplied and fitted, most UK homeowners pay somewhere in these ranges. uPVC is the cheapest route at roughly £2,000 to £3,500. It does the job on a budget, but the frames are chunkier and the panels heavier, so uPVC bifolds tend to suit smaller two or three panel openings rather than wide spans.
Aluminium is what most people picture when they think of bifolds: slim frames, big glass, and it typically runs £4,000 to £7,000 for a three panel set, more for four or five panels. Engineered timber sits at the top end, often £6,000 to £10,000 plus, and needs periodic maintenance, though it suits period properties where plastic or metal would jar. These are guide figures rather than promises, because every opening is different, but if a quote sits far outside them it is worth asking why.
Two houses on the same street can get very different quotes for good reasons. The biggest single factor is whether you are replacing an existing set of doors like for like, or creating a new, wider opening. Knocking out brickwork means a structural engineer, a steel lintel and builder's work on top of the door price, which can add £1,500 to £4,000 depending on what is above the opening.
Beyond that, it comes down to specification. Each extra panel adds several hundred pounds to over a thousand in aluminium. Glazing choice matters too: solar control glass, acoustic glass for busy roads, or integral blinds all push the figure up, while standard double glazing keeps it down. Triple glazing is worth weighing up carefully in Scotland, where winters are long, but it adds weight and cost.
A fitted price should cover the doors themselves, removal and disposal of the old frames or infill, fitting, sealing, trims, and making good internally and externally. Ask specifically whether making good is included, because replastering and redecorating around a new opening is where cheap quotes quietly fall apart.
It should also include the guarantee terms in writing, both on the product and the workmanship, and confirmation of who handles the paperwork. In Scotland that matters more than many homeowners realise, as covered below. Be wary of any figure given over the phone without a survey: bifolds are heavy, precisely engineered doors, and the surveyor needs to check the lintel, the levels and the cill before a price means anything.
Scottish rules differ from England's. Replacing doors like for like generally does not need a building warrant, but forming a new or enlarged opening usually does, and your installer or builder should be upfront about who applies to the council and what the fee is. Certification of the work also runs through different bodies than the English FENSA scheme, so ask how the installation will be certified before you sign anything.
Weather is the other local factor. West of Scotland rain is persistent and often wind driven, so weather performance ratings, decent drainage in the track and a properly designed threshold matter more here than they might in a sheltered southern garden. A level threshold looks superb, but on an exposed elevation ask your surveyor honestly whether a low weathered threshold would serve you better. Get two or three itemised local quotes, compare the specification line by line rather than the bottom figure, and check how long each firm has been trading.
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