When I speak to a potential client I always ask how many companies they are interviewing. I then ask how they are comparing one from the other. What questions are they asking and are they the same for each contractor. This is so important. You should alway have a list prepared that will ask very pointed questions and will be asked of all the contractors. A healthy number of contractors to interview is three. If you interview more than that you may find yourself overwhelmed and confused by all the information. Also, note that I said the word INTERVIEW. Asking how much something costs or for a free estimate will only get you false information and a very poor experience.