oktopusinc wrote:
I am doing a job in a building that has just been built. The concrete
floor has been poured 10mm low in places and 21mm high in others - does
anyone know the tolerances in British standards for poured concrete. I
may make a clai if they are over the limits.

If you are using the concrete slab as a finish, then you should have
specified this and the builders used proper leveling and finishing
equipment.

Many industrial units require level floors, so it is possible. But this
may not be feasible in a domestic setting.

In either case, the standard expected should have been specifically
stated in the contract documents, otherwise how do the builders know
what you want?

dg