Can i change the floors or roads after i already completed them?

Can i change the floors or roads after i already completed them?I don’t like the color of my roads because it matches some of my building.Can i replace the roads?Or even better change the color of a building wall and floor?

The cheat way to do this would be to use console commands to destroy the building and make a different one - but that can get tricky. You can also destroy door objects if you want to replace them with Engineer doors.
There are currently no “official” ways to edit buildings post-construction, however.