As an expat the services of a mortgage broker are invaluable. The advice you will receive and the assistance in selecting a lender and processing the application on your behalf will make the process far easier for you. All brokers charge a fee and by law they must inform you of their charges upfront. It is important to be aware that these costs can vary from broker to broker. Some brokers charge set fees and some charge a percentage, the average cost across the industry is equal to 1% of the amount borrowed, but it can be as high as 3% with some companies.