Inspired by the likes of Days Gone, Undawn is a post-apocalyptic zombie survivor where players need to find new equipment and fight against dangerous enemies. If you wish to expand your base then you will need the Territory Locker in the game.
This guide will tell you how to get the territory locker in Undawn.
How To Get Territory Locker

The Territory Locker is an essential item required to upgrade your headquarters to level 3. In order to unlock it, you will need to complete all main missions in the storyline including the Upgrade Homestead quest.
All active missions can be checked by clicking on the document icon above the “Team up” button. Once you have completed all the requisite missions, the Territory Locker main mission will be added to the list.

To build the locker, return to your base and open the door to place the locker inside the room. The locker can be found in the interior section of the menu and you can place it in any location according to your convenience. Constructing the locker will require 400 pieces of wood and 200 stones from your inventory.

Once the locker is built, you can upgrade your Homestead to level 3 by using 10 sheets and 5 clay bricks. Talk to Alexei standing near the entrance and the mission will be complete.

The territory locker is important if you wish to level up your base and increase its rating. Increasing the level of your Homestead will allow you to construct more buildings from the Homestead Management menu. Upgrading each building has its own requirement of materials including rare ones that are a bit hard to find.
That’s it, now go ahead and complete all the missions to unlock the Territory Locker in the game!