my understanding, at least around here, is that every separate parcel of land has to have its own utilities. You can usually get one or more parcels bundled together into a single parcel without too much trouble. But, it is something you have to get whatever government agency is in charge of such things to deal with.
I know of at least one location not far from me that is two adjacent lots and permission was denied to join them into one larger parcel. Don't know why. I think the school district did not want it because the guy was planning a modest house so the real estate taxes of the combined lots with a single house would have been less than having two lots with two houses. At present though, the lots are sitting empty, and have been since they were subdivided out maybe 10 years ago.