ᐅ Minimum width for a double-leaf window or patio door?

We like two-panel windows (without a central mullion). They will probably be made of uPVC. Do such windows make sense at a width of 100 cm (40 inches)? Or are the panels then too narrow and impractical? The same question applies to the patio door: it will be 113 cm (45 inches) wide. Is it possible to have two panels here, or does everything become too narrow?

Best regards, Steffi33

The patio door will probably need to be double-leaf, as otherwise it would be too heavy. In our case, this applied to all doors wider than 1m (3 feet).

Our patio doors are each 1.75 m (5 ft 9 in) wide. The bedroom windows on the upper floor are the same. These are, as you described, double-leaf without a central mullion.
All other windows and patio doors are standard, as they are too narrow to accommodate two leaves.

That is certainly possible. We were recently in Denmark, where there were fairly narrow mullioned windows with two sashes, which didn’t look too bad. However, they need to be visually appealing in some way.

I calculated that an open patio door panel creates about 47 cm (19 inches) of passage width for us. People often prefer not to open both panels at once out of convenience. Is 47 cm (19 inches) enough for a quick step outside? It seems quite narrow to me. What do you think? Best regards, Steffi33.

Here are the 3 patio doors (each 112.5 cm (44 inches) wide)

I meant to say that up to 1 meter (3.3 feet) width per leaf is acceptable. 1.13 meters (3.7 feet) for a single leaf might be a bit tight. But I’ve read the question again: with 1 meter (3.3 feet), I’m not sure if it would look very good. I definitely wouldn’t use that for patio doors. We have a two-leaf window with a width of 1.25 meters (4.1 feet), and that still looks good.