Please post back if you get the plugin made

Thanks guys. I tried the method Puybaret recommended and this gets me close. If I could move the dimensions to the outside of the wall, place the calculated living area outside of the room and include a breakdown of the calculations this would work perfect.

I would like to use SweetHome2D for drawing house sketches for my Real Estate work. I prefer only 2D, but I need the ability to calculate the sq ft area of the property. It would also be nice if there was a way to set the dimensions to automatically measure the outside walls. Then I could just draw ...