If a single storey, example, 10ft x8ft extension room was added to my prospective house that I am currently buying, would I require planning permission?
Is there a certain size etc that doesn't require permission? Or would I need it?
Whilst the regulations were relaxed in Oct 2008 interpreting them is quite difficult. Assuming your property is not listed I suggest you sketch what you propose and ask your local planning authority.
The sketch should include dimensions, boundaries and height of adjoining buildings.