Start with your current lender. If you're a good customer-you hold a sizable mortgage, pay on time, and maintain good credit-your existing lender will probably do everything in its power to keep your business. The company may cut you a break on fees for things like appraisals, surveys, and inspections if the information is current and you meet other requirements.
If your new mortgage rate seems too good to be true then it probably is. Check for hidden fees in your mortgage that will make up that suspicious difference.
Both new homebuyers and refinancers can get free access to the credit reports that lenders use by visiting AnnualCreditReport.com, a website created via Congressional mandate. A free report from each of the three consumer reporting agencies -- TransUnion, Experian and Equifax -- is available at no cost every 12 months. Check for errors; if mistakes are found, don't hesitate to dispute any and all inaccurate and derogatory items.
There is a refinancing myth that says you should not refinance your mortgage unless your interest rate will be at least two points less. This myth is not necessarily true if there are other benefits to the refinance or other reasons behind it.