> Plumbers probably know a contractor who can give a deal.
They also know the contractors who won't rip them off.
A house down the block from me has taken nearly a year to have siding put on and painted, in less time than that has taken, another house by me was torn down and a completely new one built in its place.
Or it could be the homeowner. My sister constantly price-shops and bickers over everything. As a result, she can't get workers/contractors. Some never show up, most never come back. If the contractor has an office, they're too big for her and as she puts it "they want too much money".
They also know the contractors who won't rip them off.
A house down the block from me has taken nearly a year to have siding put on and painted, in less time than that has taken, another house by me was torn down and a completely new one built in its place.
It all depends on who you know.