Existing single storey extension coversion to two storey

[christian_chambers]

the house we bought four years ago had an existing extension built onto it this was built without planning permission but they got it in retrospect. i am now thinking of extending upstairs over the same footprint. I do not know the existing size of the foundations. In prinicple would I have to widen the exisiting founds or should they be Ok?

[Johnatan]

Hi! You have to talk to customer services and they will request for this to be done on your install.

[welsh brickie]

bore holes to inspect the foundation will have to be excavated,the final say, rests with the building inspector