If you are opening up the back of your house to the garden, the choice usually comes down to bifold doors or French doors. Both work well in Scottish homes, but they suit different budgets, room sizes and ways of living. Here is an honest comparison based on what we see fitting both types across Glasgow and the central belt.
French doors are a pair of hinged doors, typically filling an opening of 1.2 to 1.8 metres, that swing open from the middle. They are a traditional design and suit tenement conversions, semis and older properties where you want something in keeping with the house.
Bifold doors are made up of three to seven panels that fold back on themselves and slide along a track, so you can open up almost the entire wall. They need a wider opening to make sense, usually 2.4 metres or more, which is why they are most common on extensions and newer builds where the structural opening can be designed around them.
A quality uPVC French door set supplied and fitted typically starts around 1,500 to 2,500 pounds, with aluminium versions costing more. Bifolds are a different bracket altogether: expect roughly 4,000 to 7,000 pounds for a three-panel aluminium set fitted, rising with panel count and glass specification. The final figure depends on the opening size, whether structural work such as a new lintel is needed, and the frame material.
It is worth being realistic about the building work too. If you are converting a window opening or a standard door into a wide bifold opening, the cost of widening the opening and installing a suitable lintel can add significantly to the project, whereas French doors often drop into an existing opening with little or no structural alteration.
Bifolds are unbeatable for connecting a kitchen or living space to the garden. Fold them right back and you have an opening of two to four metres with nothing in the way, which is brilliant for the handful of genuinely warm days we get and makes a room feel far bigger year round.
The honest counterpoint is that bifolds have more frame per metre of glass because of all those panel joints. A pair of French doors, especially in slim aluminium, can actually give you a cleaner view when the doors are shut, and in Glasgow the doors are shut most of the year. French doors also let you open just one leaf for ventilation without committing to opening a wall.
Both types are available with double or triple glazing and will comfortably meet building standards, but weather sealing matters more here than in the south. Bifolds rely on gaskets and a bottom track that must stay clear of grit and leaves, and a poorly installed track is the most common source of draughts and water ingress we get called out to. A well fitted set with a properly drained threshold handles horizontal Scottish rain fine, but installation quality is critical.
French doors are mechanically simpler, with fewer moving parts and seals to maintain, so there is less to go wrong over 20 years. On security, both should come with multi-point locking as standard; look for PAS 24 rated doorsets whichever you choose. Aluminium frames suit bifolds because the panels are heavy, while uPVC keeps French doors affordable and low maintenance.
If you are extending and the budget allows, bifolds transform how a room feels and remain the most requested option on kitchen extensions we fit across Glasgow, Lanarkshire and beyond. If you are replacing an existing back door or patio door in a standard opening, French doors give you most of the benefit for a third to a half of the cost.
There is a middle option worth mentioning: sliding patio doors give large uninterrupted glass panes without the folding mechanism, often at a price between the two. The right answer depends on your opening size, budget and how much you value that fully open wall, so it is worth getting measured up and pricing two options side by side before deciding.
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