If you plan on permitting it that unpermitted portion is going to be a serious anchor.


This is like asking how much for an ar15. Cheapest is materials and beer to how much do you want to spend? Finishes and materials matter.

The reason i got out of custom home projects is i get sick of design issues with the customer not knowing what they want and changing directions mid project. Example i was setting cabinets when they decided they wanted the wall to be a "half wall island thing" so i stop and bid a change order which they reject two days later due to cost but the wife subtly bitches about my prices for the rest of the job. I tried explaining that it would have been cheaper to have me build the half wall in the beginning but she couldn't visualize it.

point is know what you want before you start asking for prices. Take some time to lay it out. Mock it up with sheets for walls if you have to.

cheapest you can finish a basement would be about $30/ sq. Typical is about 65/sq if you do all the labor. 20k is a cheap bid for hands off.