So I'm buying this house, and noticed that the neighbours next door have modified the first floor of an identical house. Roof raised, rear only, for what looks like a couple of extra rooms on a 3rd level. Based on my limited understanding of the rules, they've almost certainly needed planning permission before getting it done.
I'm a bit nosey how their layout now differs from the place I'm buying as a result. I'm already sure I'd like an upstairs or ensuite bathroom or loo at some point, I think the downstairs bathroom would work better as a nice large loo. Are there plans, showing the changes to the internal layout, in the public domain for me to access?