I'm looking at buying a house that has a mezzanine (approx 14 feet long and 52 inches wide). It's currently around a foot too narrow to fit a sofa bed across it (which we'd like to have for guests as the house is three bed compared to four at the moment). Also considering putting up a stud wall instead of the railing but with 'windows' to match the existing ones and then with blinds inside for privacy (family don't live locally so we often have them over for a week at a time).
Does anyone know how complex/etc it would be to extend the mezzanine out by around a foot? I don't think planning permission would be needed as it's internal and won't be a habitable room but worst case, I can see that it might require a steel beam or similar across the room.
(this pic makes it look quite narrow but it is over 4 feet wide)
We won't be keeping the sofa