Good advice to follow when choosing a contractor:

“It’s unwise to pay too much, but it’s worse to pay too little. When you pay too much, you lose a little money – that is all. When you pay too little, you sometimes lose everything; because the thing you bought was incapable of doing the job it was bought to do. The common law of business balance prohibits paying a little and getting a lot. It cannot be done. If you deal with the lowest bidder, it is well to add something for the risk you run; and if you do that you will have enough to pay for something better.”– John Ruskin (1819-1900)