I wonder if you might be able to help. I am having outbuilding built in my rear garden & having the foundations done. We have filled the foundations with concrete but aren't entirely sure how far below ground level we need to stop the concreting. The building regulations plan I have from the architect onlys says "trech fill foundations 600mm wide"...any ideas?
Also what needs to be put on after the foundations are done?
Thanks in advance.