Do you already have a basement. If so it depends on the terrain. How big a concrete cut you want. Is there a place for excavated dirt on the property? What type of windows or doors. Landscaping or retaining wall? Level of detail and trim. How much work are you willing to do yourself or hire out?
Normally the basement would have to already be there. To add a basement would be expensive to raise the house, dig a hole and put the house back on the new basement. Too many variables to price out without knowing LOTS more.
It really depends on the buyer and how much you are wanting to do. Sometimes the more square footage you put in, the lower the cost per square foot. I recommend doing some calling around. Get some quotes and compare costs. That is a good way to go about it. http://www.coretechindustries.ca/en/services.html