Replacement cost of the home which is determined by the type of building materials used to build the house, territory or zip code, your insurance history such as insurance score and claims history if any, and a few other factors depending on the company. Its always best to get a couple quotes and compare not just rates but also coverage. Some policies are broad form and some are special which are very different contracts. You really need to get some quotes from insurance agents and compare them. Its a bit of work but hopefully the company you get insured with is the one you keep for a while.