Although you have enclosed the light indirect light from the light source seems to seep through especially on the ceiling and the floor.
Unity light passing through walls.
You have a point light source behind some walls.
Set the point light s baking property to mixed or baked then bake your lighting data using the lighting tab.
This solution works in other engines like unity and ue4.
If either of these don t solve.
You can simulate this in shaders or use raycasts to see if the light is behind a wall.
Light passing through walls 1.
Shadows are the obvious answer however i assume you are using lite and that s not an option.
This solution works in other engines like unity and ue4.
Create a unity primitive cube plane etc sized similarly to your wall remove its collider and in the mesh.
This is a quick fix for the light bleed that i was having a while ago.
These options have obvious edge cases that can t be easily resolved.
That s why shadows exist.
By sydon thursday november 2 2017.
In that case you ll need to be a bit more clever.