A pre-approval letter is more reliable than a pre-qualification. Getting A pre-qualification letter is easy. You just call a mortgage broker or lender, provide some basic financial information, then wait a few minutes for the letter to come through your fax machine. Getting a “pre-qual” from a Web site is just as easy. Enter some information, click ‘submit’ and voila. A pre-approval letter, on the other hand, involves verification of the information. Rather than taking your word as faith, the lender will ask for documentation to confirm your employment, the source of your down payment and other aspects of you financial circumstances. Granted, a pre-approval is more time-consuming (and possibly more stressful) than a pre-qualification. The additional due diligence is exactly why the pre-approval carries more weight.