Firstly great forum - keep up the great work & advice - very helpful.
We are looking to extend out on top of a single-storey extension, to create a bedroom, but I have been given conflicting advice regarding foundations for such.
I heard that after a certain year, any single-storey extension HAD to have foundations deep enough to allow for 2 storey's regardless of how high the original extension will be. Is this the case? If so, which year did this regulation come in as I can't find any information regarding this on-line.
Many thanks in advance for your help with this.