When planning my land, I select a building-action from the build-menu to find out where I can build and where I cannot build. I also try to find out which areas contain connected buildable grids. This helps me to find out where to put my storehouse and put other buildings arround it.
This tric works, but in my opinion, is a tric. Will there be a feature to show buildable area's / grids? Or a way to discover it more easily?