Bigger/more buildings?

I just discovered this game and have about 10 hours into the game. But now after a lot of experimenting and failing all of my buildings are full! I want too keep expanding, so is there any way to get more or bigger buildings?

Each scenario has a map size.
This map size shows you how many building your factory can have.
In custom games you can have anything between 2x2 to 4x4 buildings.

There is no way to obtain more building rather than those with each scenario generates.