You'll want to make sure that whoever is working on your plumbing understands current building codes and has expert plumbing knowledge. Ask to see their trade license number as well as their registered business number. Asking to verify the dollar amounts of their bonding and insurance is also standard practice. Bonding and insurance helps protect you as the homeowner from accidents, injury, damage to property or unpaid work.
Having plumbing work done, whether it's for your home or business, can be incredibly expensive. That's why it's vital for you to ask a plumbing service the right kind of questions before you hire them. You want to do as much due diligence on your part as possible to get a professional who will not only do quality work but also charge you a fair price for it.
The word "plumber" dates from the Roman Empire.[3] The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes[4] and some were also covered with lead, lead was also used for piping and for making baths.[5] In medieval times anyone who worked with lead was referred to as a plumber as can be seen from an extract of workmen fixing a roof in Westminster Palace and were referred to as plumbers "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead, and about various defects in the roof of the little hall".[6] Thus a person with expertise in working with lead was first known as a Plumbarius which was later shortened to plumber. 

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