A pre-approved mortgage is one that provides an interest rate guarantee from a lender for a specified period of time (usually 60 to 90 days) and for a set amount of money. The pre-approval is calculated on the basis of information provided by the borrower and is subject to certain conditions being fulfilled before the mortgage if finalized. These conditions usually include factors such as a written confirmation of employment and income among other things. Many brokers prefer it when their clients have a pre-approved mortgage as this gives a clear idea of the affordable price range when hunting for a new home.