Collision box for allowing building and disallowing building when player is in or out the collision.

[Quetzalcodename]

Hey @MangoPenguin2601!

It sounds like what you are looking for is a trigger box. Check out this non-Epic affiliated basic overview of how to set them up:

How to make a Trigger Event in Unreal Engine 5

You will want two events. On event begin overlap and on event end overlap.

I hope the above is the solution you need!