Help with building

Hello all, I am about to attempt my first large scale complex build. It is going to be a Modern style house. 7 bedrooms, 8.5 baths, 3 floors, and 2 car garage. My only real issue is converting scale. What would a real world scale be for a single block in its default 1x1x1 state? Is it 1m x1m x1m? Or 0.6m x 0.6m x 0.6m? Thank you in advance. I will post pics of my progress in the near future.

Thank you SonoBionda, as well as you, red51 . I very much appreciate it. Now, I can begin the groundwork.