Contact the references and visit the job sites, if possible. A contractor who has nothing to hide should not hesitate to give references. In addition, many people who are pleased with the results of their home improvement project will be glad to act as references for their contractor. After narrowing the field of possible contractors, ask for estimates for your job. Get at least two estimates, but preferably three.
Some contractors charge a fee for estimates - ask first to avoid misunderstandings.
Be sure that your estimates are comparable. You should also ask for detailed information about the work materials the contractor is planning to use, such as brand name, make and model, size, and quantity. When making your final decision, do not consider cost alone. If your have any personal reservations about the contractor, follow your instincts. In many instances, you will see the contractor every day for the duration of the job, and it is therefore a good idea to make sure you feel comfortable talking with him or her about the job and having him or her around your house for the given period of time.