how do you refinance a mortgage People refinance their mortgage for a variety of reasons. When you refinance debt, including mortgages, you apply for a new loan and use the borrowed money to pay off your original loan. Often the funds move from one lender to another without you ever touching it.what is the current interest rate on a home loan loan options for home addition Construction Loans for Existing Home Additions – finweb.com – Construction loans can be great means of paying the costs associated with additions to existing homes. Here are a few things to consider about using a construction loan for that purpose. Construction Loan. Using a construction loan for an existing home addition can provide you with a lot of flexibility when compared to other types of loans.