View the thread, titled "What Type of Services need to expect from a Commercial Plumber?" which is posted in Industrial Plumbing Advice Forum on UK Plumbers Forums.
Silly question: Does your project also have any elements of masonry, carpentry, electrics etc etc. Does it need a surveyor first? Does it need building control?
Many professional plumbers are multi talented, but be careful to think clearly about this.
Can you explain a bit more about your project, and perhaps add some photos of relevant.
Reply to the thread, titled "What Type of Services need to expect from a Commercial Plumber?" which is posted in Industrial Plumbing Advice Forum on Plumbers Forums.