Your bank should have an appraiser to pull comps for the re-financed value. You should not be responsible for giving them the information. However if you want to get an idea of what they will come up with I would be happy to do a Comparative Market analysis for your home for free. You really should be comparing similar homes in the same neighborhood. As the zip code can have a wide variety of home prices. Ideally you want to compare homes that are: the same age, neighborhood, # bedrooms, # bathrooms, similar square footage, similar lot size, same # of garages, same number of stories. Call me and i can do this for you in a matter of minutes. My phone number is on my website below.
Your bank will do an appraisal to determine the value of your house and what they want to lend on it. The appraisal should be based on actual sales data, but they could also use trends.....so if there were 3 sales in the neighborhood all exactly like your house and #1 in May was 10,000, #2 in June was $9000, #3 in July was $8000, they may take that into consideration and not give you an appraisal for $9000. The appraiser typically has access to the MLS and can see sales data. You may want to see the appraisal they used and ensure the homes they used were comparable. The appraisers generally are pretty good, but often a homeowner may know more about the neighborhood than any appraiser or realtor. We haven't always gone in the homes that we are using for sales data, buy you might have. You could ask why didn't you use X or Y home, etc.
Abesent that you might ask them to suggest a realtor in your neighborhood who could print a quick CMA for you.
San Juanita Schafer, Realtor, e-PRO, GRI
KELLER WILLIAMS REALTY
You may also register at my website for a Market Snapshot for your property. I won't bug you, unless you ask. : ))