Shadows are the obvious answer however i assume you are using lite and that s not an option.
Unity light passing through walls.
This solution works in other engines like unity and ue4.
How to fix indirect lights seeping through walls.
Light passing through walls 1.
Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling and the floor.
If either of these don t solve.
By sydon thursday november 2 2017.
You can simulate this in shaders or use raycasts to see if the light is behind a wall.
It s really just a shadow type setting that needs to be set right.
Create a unity primitive cube plane etc sized similarly to your wall remove its collider and in the mesh.
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You have a point light source behind some walls.
In that case you ll need to be a bit more clever.
These options have obvious edge cases that can t be easily resolved.
This solution works in other engines like unity and ue4.