A home buyer or builder can obtain financing (a loan) either to purchase or secure against the property from a financial institution, such as a bank, either directly or indirectly through intermediaries. Features of mortgage loans such as the size of the loan, maturity of the loan, interest rate, method of paying off the loan, and other characteristics can vary considerably.

The process of remortgaging does not usually involve moving home or taking out a second mortgage on the property; it is in effect the transfer of a mortgage from one lender to another. Homeowners may choose to remortgage for various reasons, including to reduce the size of repayments, to pay off a mortgage earlier, to raise capital, or to consolidate other debts.

Homeowners often mis-use the expression remortgage when they are simply switching from one product to another with the same lender; this is not a remortgage which involves the removal of one legal charge over a property and its substitution with another in favour of a new lender.