It would depend on the size, age, dimensions and how much you're willing to spend.Hope that helps! 

Simply a one sheet floor plan with individual dimensions will suffice.You don't have to be a draftsman or architect and hopefully someone will enjoy this practice.

Also newish to rei- Can i add a dimension to the question?

I don't know the dimensions off the top of my head but I can contact her tomorrow and get them for you.

I'm looking at one now as a potential rental property that has these bedroom dimensions: 9 feet by 9 feet, 8 feet by 7 feet, and 14 feet by 11 feet.

They only come in predetermined widths, so define what the base dimensions will be for the "tub" and then build off that. 

Make sure the print off has dimensions on every side.

The area is Washington, DC however for future projects Prince George's County MD is a likely target so if you're willing to pass along any contact info for contractors I'd appreciate it.The house is a 3 level duplex in DC about 400 ft2 per level (per tax record) but really they measured from the outside walls it is about 350 a level if you measure interior dimensions. 

It could be a portal to a new more profitable dimension, or it could mean total destruction and irreversible debt.

If "starting from scratch" means rebuilding something with about the same dimensions, and the base is in good shape it would be a significant savings to start with what's there.