You did not say what city/village it's in. That's the first place you need to start.
It is up to the local goverment what the minimum requirments are. Every place is different. IMO you should be licensed to do services but that's not allways a rule. For residential many places allow a HO to pull a service permit. It may also depend on if you own the building, renting, and building use.
You may also need to consult the utility as far as what they will supply you and where on the building.
Sorry I can't give you a number cause we don't do much as far as CT's. I would think more details would be needed to price out a service.