When seeking quotes for residential construction, be clear as to what is excepted. Some materials are vastly more expensive than others, so if some specific material is required, than the contractor needs to know this to give an accurate quote.
Those desiring home construction services should always get quotes from multiple contractors. Make sure that anyone that does work on a home be licensed and insured in case something goes wrong. If the project needs to be completed on a strict schedule, it may cost more to complete. Always look at pictures of other projects that have been completed by any contractor that is under consideration for a project.