Easy access to boiler and pipework. No breakables or expensive carpets to worry about in the building. Easy private parking (about 5ft from the front door of the building) for 3 vans if you want to.Condensate run not too bad down to the kitchen waste pipe area.
I would say that I could do the job on my own in a day and I am not a plumber.
 ATM the sinks HW (or lack of it) is fed from a broken electric 3kW HW wall mounted heater and it would cost less to plumb them into a combi than replace the HW heater so this is part of the quote.
All quotes were NOT to include electrical work, cost of stats and programmers etc.
Any guesses on the quotes?