[ryanackley]

This is true in most parts of the USA as well. In the State of Florida where I live, all drawings and plans become public record and these would definitely be enough to build. This is because all drawings used to build are required to be submitted. This includes details like engineering drawings and calculations and roof truss layout.

They are still protected by copyright but I'm not sure if it's relevant in the context of using the same plans to build a house. Copyright is meant to protect against copying and derivative works not how the information is used.