Are you thinking of finishing your basment or is your basement finished already? Typically the basement is given 50% of the value of the main levels. It also depends how the basement is finished quality wise too. Hope this helps. If you have additional questions, please feel free to call me at 919-624-1631. We do have a home with an unifinshed basement and decided not to finish the basement right now.
Your Raleigh Realtor, Pamela
Determining the value per square foot is more of an appraisal function and you may want to contact a local appraiser as well.
1) How buried is your basement? For example a walk-out basement on one or more sides will be worth more than a no window cellar.
2) Are the finishes of the basement equivalent to those in the rest of the home?
3) What is in the basement? One large room with walls and lights, or multiple rooms with entertainment center, office, bathroom, bedrooms, fireplace, kitchen etc...
To sumarize the more the basement is like the rest of your home the more it will be worth.
If you have a copy of your appraisal from when you purchsed the home, and the basement was finished then all of these issues would have already been addressed by that appraiser to establish the relative value of above and below ground areas.
If you recently finished it, are there comparable home sales in your neighborhood also with basements, they could really help narrow down the basement value.
Similar topic, NC Real Estate Commission Square footage guidleines found at web reference.