Convert floorplan into 3D space?

I’ve drawn a floorplan in Shapr3D, using construction lines for the spaces where doors go. (I did this so I could make multiple wall segments all be parallel and coincident — I couldn’t figure out how to do this any other way.)

Regardless… I’m stymied trying to turn this into a 3D space.

I want to add wall thickness. I’m trying to use the Offset tool, but that’s not working even a little bit.

What is the proper workflow to accomplish this?

Thanks.

There are 2 different offset single line and the loop.

Try the single line.

If you have the actual room measurements you want to work with, adding an offset will reduce the room area, which isn’t accurate. So instead, I would suggest drawing with wall thickness included from the start.