The garage gets unlocked at the main game screen mission line Groundskeeper Jerry at which Jerry requests you to make a single zombie trimmer. Two missions later Ice ice baby is requested to be made three times.
The garage takes 40 clicks and a total of 120 bricks to complete. Each click changes the appearance of the garage until it is complete.
Required to complete garage:
Upgrading the garage takes 20 blueprints.
In the Garage you can craft these weapons: