Most people don't realize that there are a series of important facts they should know about their building contractor before hiring them to build or renovate their home. First, make sure that the contractor you are dealing with is registered with the state as Home Improvement Contractor ("HIC") and has a Construction Supervisor's License ("CSL"). Contractors who have registered as an HIC are required to pay a fee to a Guaranty Fund held by the Office of Consumer Affairs that may be available to partially reimburse the homeowner if the contractor does not perform or performs negligently. A Construction Supervisor's License can only be obtained after the contractor has passed a test showing that he or she has knowledge of the building code, which will be important when the work is reviewed by a building inspector. More detailed information regarding HICs and CSLs can be found on the website for Massachusetts Office of Consumer Affairs and Business Regulation. This website also details the complaint process homeowners can use when something goes wrong.