If you are going to chance a toilet or sink and place the new ones in the same place. Sure I am pretty sure he can do it. But i build a new house and I asked for 6 zones for the radiant floor heating and gave me 6 thermostats but he only set 5 zones and join two of them together. Also fail all the inspections the 1st time. And some more then once. I should have known when he told me that another of his clients sue him for his damage floor from a leak. Which he said it had nothing to do with him