Door
Doors are used to enter and exit buildings. Zombie cannot open doors, but they can bash through them, breaking the door permanently. Much like windows, a door can be barricaded, giving an additional 30 health.
It is also possible to break down a door with a melee weapon. The axe is the most efficient, taking 2 hits for each unit of health. The hammer and baseball bat can also be used but will require a lot more uses. Breaking down a door will cause lots of noise.
A broken down door will turn into wood planks, doorknobs and door hinges, which can be used to craft new doors that replace broken ones.
Wooden Door
The wooden door is a 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.