Personally go and look at plumber past works.Enquire about his attitude with past owners.
While checking , check for any leakages in the buildings where he worked in past.
while checking buildings select the ones which are 2-3 years old. so that all the defects might have come out.
While fixing an aggrement, consider maintainability aspect also. Whether plumber will be available or not. This is important thing.
While speaking with Plumber, before finalizing the agreement with him, check below items with him whether he will do all these works or not. Let me know if there are any items I missed
Rain water harvesting
Bore well fitting ( from bore well to tank)
Kaveri/Manjeera/CMC/Local bore/Municipality water line
Solar water heater connections
Hot water for kitchen if required
Bath room and kitche pipes fixing
Motor connection – Sump to tank
Water proofing work – few of the plumbers will not do this but u can check with them
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