Before anyone can give you an estimate, what improvements have you made? If you expanded and renovated (all done with permits), that should have a positive effect on the market value of your house.
What are comparable properties in your area selling for today?
Consult a local realtor to give you a comparable market analysis. Don;t be surprised if the realtor asks to see your place. Going by square footage isn't prudent. After all would you think that a straw house is worth as much as brick house if they are the same size?... more