The back door in (from? to?) my house leads out of the utility room, which itself leads off the kitchen. In the 15 years we've lived here, I doubt we've opened it more than 2 or 3 times (it's only a few feet from the front door!) We're about to refit the kitchen and utility room, and we would much rather have the wall-space in the utility room than the back door.
So ... is there any regulatory reason why we shouldn't just brick it up?