I plan on re instating an exterior door where there used to be one many years ago (before I lived here). That rooms going to be the new kitchen and the other half would like a stable door of some description in there. The issue is the current window width is 800mm and the supporting buttresses you can see either side will prevent the doorway being widened any more without substantial further work. I looked into a UPVC option and with a door frame thickness of 70mm either side I’ll only end up with a 660mm width door - which is very narrow. I gather a standard timber frame size would be 50mm so if I went for a wooden door I’d get a teeny bit more width in. Is there anything else you guys can think of? Obviously this door will be internal opening, can wood door frames be shaved down further? Could I have the frame recessed into surrounding wall at all?