Balconies are highly contentious and require PP and BR. The regulations associated with the balcony safety railings etc, are also quite strict. He'd be expecting to fix the rails to your wall, so I'd say it's a non started from the outset.
The consensus is that, apart from the almost possibility of getting the project past planners and building control, he needs my permission to connect his joists to my wall. In terms of the wall, there's doubt as to whether it's a party wall or not with one contributor suggesting that the centre-line of the chimney is the boundary. If that definition were to be true, my outside edge is plumb with that line - see pic.
There's no doubt. Its not a party wall as its not separating rooms between dwellings. And he cant make it a party wall either.
Do you reckon that the centre-point of the chimney would satisfactorily indicate the boundary line?
Maybe add 'parties' to that.
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