A good contractor is your best bet for estimating your finished basements. It is a good idea to plan our ahead what types of work do you want done. Will you want rough or finished work? Rough work consists of moving existing mechanical fixtures, adding a floor, upgrading electrical if needed, and expanding windows. Finished work would entail drywall, paint, carpet, plumbing fixtures,
. cabinets, and any other custom work needed. Here is a link to a good remodeling guide with photos: http://www.handyamerican.com/articles-list-basement-remodeling.asp