Ask three companies for a bifold door quote and you can get three wildly different numbers, which makes it hard to know what a fair price actually looks like. This guide sets out realistic installed prices for homes in Glasgow and the central belt, explains what drives the cost up or down, and flags the extras that often catch people out.
For a standard opening of around 2.4 to 3 metres, most homeowners in the west of Scotland pay somewhere between £2,500 and £7,000 fully installed. The spread is that wide because frame material, the number of panels and the state of the existing opening all matter enormously. As a rule of thumb, budget per set rather than per panel, and treat any quote given without a site visit as provisional.
These are realistic ranges rather than promises, and every house is different, but they should help you sniff out both an overpriced quote and one that looks too good to be true.
Aluminium dominates the bifold market for good reason. The slim frames give you more glass, the panels stay rigid over a 2 metre drop, and powder coated finishes cope well with Scottish weather. You pay a premium of roughly £1,500 to £2,500 over uPVC for a typical set, but on doors this size it is usually money well spent.
uPVC bifolds are the budget option and can work well on smaller two panel openings, but the chunkier frames flex more on wider spans, which can lead to alignment problems down the line. Timber looks superb on traditional stone properties, of which Glasgow has plenty, but expect to repaint or re-oil every few years, particularly on south and west facing elevations that take the brunt of the rain.
The doors themselves are only part of the bill. If you are widening an existing opening, say replacing a window and section of wall in a tenement conversion or a 1930s semi, you will need a structural lintel and possibly a structural engineer's calculations. Builder's work of this kind commonly adds £1,000 to £3,000, and in older sandstone properties it can be more once wall thickness and load are taken into account.
Glazing spec matters too. Double glazing is standard, but given central belt winters many customers choose upgraded thermal units or solar control glass, adding a few hundred pounds per panel. Access is another local factor: getting large glass panels up a shared close or into a rear garden with no side access takes longer and may need extra labour, which shows up in the quote.
Make sure every quote covers the same scope: supply, installation, removal and disposal of the old frames, making good the plaster and any external sealing. A cheap headline price that excludes making good can end up dearer once you pay a plasterer separately. Check the guarantee terms as well, since hardware and glazing units are often covered for different periods than the frames.
Ask who is actually fitting the doors and whether the installation is registered with a scheme such as FENSA or Certass, which you will need for the paperwork when you sell the house. Finally, be wary of heavy discount tactics with a signature required on the day. A reputable installer will give you a written quote that stands for weeks, not hours.
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