For those getting ready to stride into the world of home ownership, the uncertainties of pre-approval can cast a shadow of doubt over an otherwise exciting time. When is it necessary? How long does it last? And what does it involve, exactly?

Pre-approval is a lender’s assessment of your likelihood of being approved for an otherwise suitable loan. The appraisal is made on the basis of your ability to service a loan by looking into your living expenses and liabilities, your credit history, your employment circumstances and how often you have moved home or employment in the recent past.