How to unlock: You must complete the When Freedom Calls main quest and meet with Sturges in Sanctuary (M1,3).
- Build beds for Sanctuary inhabitants
- Provide clean water for Sanctuary
- Provide food for Sanctuary
- Prepare defenses for Sanctuary
Building beds for Sanctuary inhabitants
This quest won't appear in your journal right away. At the end of the main quest When Freedom Calls you'll be informed by Preston Garvey than you can talk to Sturges on the topic of rebuilding the Sanctuary so that it becomes a new strong settlement for the Minutemen. Find Sturges in Sanctuary and talk to him. Your first task will be to build enough beds to fulfill 100% of the current requirements. Locate a workshop in Sanctuary and interact with it. Choose Furniture and then Beds.
Each bed can be built only after you've collected 4 steel and 5 cloth (this rule will also apply to other projects described later in the text). Once you've collected all the required resources choose one of the beds and move to an area where it can be placed (screenshot above). It would be best to place all beds inside the larger rooms of the nearby houses. Build a sufficient number of beds (five unless new people have arrived) and then report back to Sturges.
Providing clean water for Sanctuary
Your next job is to provide the settlers with a source of clean water. Use the workshop, go to the Resources tab and choose Water. You can start building water pumps (they can be placed only on dirt) or better water purifiers if you've upgraded Sanctuary in the meantime (they must be placed in the water). Build enough objects so that you'll fulfill 100% of the current requirements.
Providing food for Sanctuary
Check back with Sturges again. The next task will be to provide food for the settlers. Use the workshop, go to the Resources category and choose Food. Start placing objects depending on your current resources and preferences. You also have to assign one of the settlers to the task of collecting food (turn towards a settler and issue a command).
Preparing defenses for Sanctuary
Once you've placed a sufficient number of plants you can return to Sturges. The final assignment in this quest is to construct objects which will increase the settlement's defense rating. Open the workshop window and go to the Defense tab. You choose between many objects from three main categories - Guard Posts, Turrets and Traps. Guard posts require personnel and traps require energy so it's best to focus on traps. If you want to end this quest as quickly as possible you can start placing the basic Machinegun Turrets. Construct enough of them to fulfill 100% of the camp's requirements. Returns to Sturges for the last time to receive his gratitude.
Quest rewards: Experience points.