Low remortgage rates are what that drives the borrowers to opt for remortgages. Some times borrowers take loans at higher rate of interest when they are in dire need of funds. In such situations, they can opt for remortgages if they find that some other lender or even the existing lender is prepared to offer lower remortgage rates. Remortgages allow the borrower to repay the existing mortgage with the proceeds of a new mortgage using the same collateral.