The process of buying a house requires an investment of time as well as money. So, if you want to get a good deal, doing your homework is crucial.

"The fallacy is that 'getting a good deal' is all locked in at the initial transaction, on the purchase price or the initial loan," Lynnette Khalfani-Cox, New York Times bestselling author and co-founder of AskTheMoneyCoach.com, tells CNBC Make It.