I assume the OP means block...
I'm currently getting a 4.5m by 3m shed built from 9" cavity blocks, concrete foundations, insulated floor, tiled sloping roof, lean to type jobby, guttering, facia and soffet. It will have 2 double sockets and a light. Outside will be plastered. Cost is 4k. I'm supplying a set of double doors and will insulate it internally myself.
Builder is doing a lot of other work for me but he priced this "keen" enough...
Not connection to me at all but search gumtree for block shed - interesting....