Have any changes or upgrades made to the project put in writing by your contractor. Adding upgrades, even small items, in the middle of a renovation can be costly, and Robyn says you need to require your contractor to write up a "change order." "Those change orders should not only highlight or discuss what changes you are going to make, but should set forth exactly how much those changes are going to cost," Robyn says. 

Pay special attention to your relationship during while you're remodeling your home.