Door
Doors are used to enter and exit buildings. Zombie cannot open doors, but they can bash through them, breaking the door permanently.
A door can be barricaded, giving it an additional 30 health.
Weak Wooden Door
The weak wooden door is a normal regular door. It is the main door type of buildings in the suburbs. It has 5 Health.
Locked Door
As the name suggests, the Locked Door is locked. You cannnot open it from the outside unless you break it down. It has 7 Health.