This is a very common fuck up...
Someone buys a house, updates the kitchen with granite counters, and the bathroom with new fixtures, etc...adds landscaping, and then expects the house to sell for appreciably more. It may be easier to sell, but the value is tied to basically two things, location, and sq footage... If you do not increase the sq footage, it will not sell for appreciably more.....they look at how much the other homes in the same or similar location have sold for per sq ft, and that is basically what your home is worth....
Now, add cheap ass sq ft, and Bam! make some money...