I would like to add on to my house. I want a 20x20 2 story addition. I already have the foundation of the original 20 x12 1 story room here. can the 20 by 30 universal be added on to my existing 2 story home only make it 20 by 20? If so how do I modify it?
You will most likely want some local help to customize and meld the two plans together. There will be some new floor plan layouts and connection details that will need to be worked out for the specific conditions. The Universal plans would allow you to do some overlay sketches for the shorter floor plan and to see how the two plans could be combined in a general way, but you should probably work with a local home designer for the final combined plans and details.