This is one of the moist asked questions, and while it’s not an easy answer, a typical range would be from $27 – $55/SqFt as a range. This depends drastically on the size of the basement and what you need done and off course the amount of upgrades you chose. So if you’re having a 3 piece bathroom in your basement, this will increase the cost of your project per SqFt, and surprising enough to many, the bigger the basement the lower the cost per SqFt.