An Agreement in Principle is also known as a 'Decision in Principle' or a 'Mortgage Promise', A mortgage lender will give you this to show how much they might lend you, based on the details you have provided. It's not a binding offer but it could help demonstrate that you're serious about the property.
Click here to find out more about an Agreement in Principle.
Your home may be repossessed if you do not keep up repayments on your mortgage