add a lightmass portal to the doorway and add a post process volume to cover only the house then tweak the indirect lighting. Also set your lights to static and bake the lighting for better indoor lighting quality
If it’s baked lighting (I’m guessing it is) then I think it’s the lightmap resolution of this house! It’s not bright what you see but a random, blurred lighting result due to low resolution lightmap! By raising the lightmap resolution you should get more proper lighting information!