For the most part, mortgage rates among lenders should not vary more than 1/4 percent. More than that, you should know that you are paying it in another way, as another "fee." As Gail said, it is often difficult to compare mortgages as there are many variables that affect the bottom line. Fees add up. Often mortgage lenders give the best possible scenerio on their Good Faith Estimates. I would ask them to give you the worst possible scenerio instead. Remember, everything, including fees and points are negotiable. The higher your credit scores, the more you can negotiate.