On 16/05/2020 15:30, George Miles wrote:
I'm thinking of connecting 2 little outbuildings to the house,
and putting on a new insulated roof.

What will Building Control think, will they want new foundations?

One is victorian stone, one is 70's blocks.

Should I dig some kind of exploratory holes?

They've been roofed for decades with no cracking so should be OK,
do I have to have some kind of expensive surveyors?

George

doubt it ....