Here is a save game at the end of the game before the last mission named "The Wall" for "State of Decay", "Year One" edition.
The files can be used to replace the current save game by placing them within the save game folder. The save game folder will vary depending on releases, and sometimes it can even be found within the installation directory under a folder named USER
. For Steam, the location will be somewhere within the Steam folder.
After finishing the mission that involves bringing home the doctor, a new mission appears shortly thereafter named "Home Away from Home" where the player is told to scout for a new home. Looking at the map, the most tactical move seems to be to go to "Snyder Trucking" (on the South-West) where the maximal building spots, up to 8, are available in the game. Similarly, from experience, the area is easily defensible.
From a practical point of view, there is no reason to find any other home, all the others having less space for facilities. Fortunately even, the "Home Away from Home" mission pops up early in the game, such that the player can move over to the final destination early on in the game.
Meeting the requirements to move there, namely "12 people" and "50 building materials" is not too difficult. Materials can be collected and dumped into the car, with large payloads being delivered all at once. As for the "12 people" required, the trick is to continue doing quests, in particular, helping out neighbors such that at some point the neighbors the player is helping will start joining the main base.