1. Time is money
Find plumbers who take it upon themselves to read the plans and understand the design and aesthetics required as well as having a director or a qualified tradesman at the job at all stages. You want plumbers to avoid depending on the guidance of builders. Having tradespeople with a proactive approach that the work completed matches the ultimate intention of the project. This way, you will not have to worry about re-visiting the work so you can achieve an efficient result.