The term 'contractor' is used for people to indulge in the field of construction services. And construction including building new structures, dams or roads, drainage & sewage installations as well as modifies or refines existing ones.
You will need the services of a plumbing contractor when building a new home as well as for the maintenance of your old pipe fittings. When you are building a new home, the amount of work required too comprehensive plumb.
You should discuss the requirements of your pipes with the main contractor. He should have appointed a plumber for all direct pipeline installation needs such as primary and bath fitting pipe fittings etc.
However, if you want to designate a different pipe contractor, then you can ask your building contractor to work closely with your decision.
A plumbing contractor shall work in close coordination with the building contractor. A plumber must have a clear idea about the layout of buildings and foundations in order to create a proper foundation for the soil pipe fittings.
If you are too extensive pipework would be wise to appoint a well-known plumbing contractor overseas for all divisions of your construction pipeline.
You can search for a decent plumbing contractor in your area to start a casual online search. An online directory where you will find many plumbing services listed along with contact numbers and addresses.