When talking about home projects before selling a property, there are so many things to consider.
Here is a good article with a list of improvements and a ROI calculation on http://www.thisoldhouse.com:
Ultimately, everybody should consider the city and neighborhood they live in, because the remodeling/improvement has to be consistent with the type of home a buyer expects to find there and the buyer's economic power. Also, I would refer to recent sales in the neighborhood and the condition of those properties.
Alina Aeby-Broker Associate
Pacific Union International