Go to realtor.com and on the home page there is a "what's my home worth?" area. You just plug in your address and it lists recent home sales around you with beds, baths, sq.ft., and year built. You can also use realtor.com and nneren.com to do a search on the # of bedrooms,baths,etc..that your house is in your town and see what comparable houses are listed for. Also, drive around and check out for sale by owner houses in your area and see what they are selling for. You are right in doing your research because the assessment value of your house is not necessarily the selling price for your house. This should keep you busy for a while