The lowest bid is not necessarily the worst. And neither is the highest bid from the best contractor. "The low bid could be from someone who's not including things that need to be done," says TOH general contractor Tom Silva. "And the highest bid could be from someone who didn't want the job."
Tom recommends questioning bidders about the specifics. "Ask, 'Can you tell me what he's doing that you're not doing?' 'Is this included in your bid?' 'How are you going to deal with that problem?'" Once you pick a contractor, check that the company is licensed and insured before signing him on. "Not just liability insurance," Tom advises. "Workers' comp, too."
"The low bid could be from someone who's not including everything, and the highest from a contractor who didn't want the job."