I see depth-mapped shadows. Your depth map size will be a factor. The depth map necessary to cover, in detail, a lone figure, is very different from a whole house. Even though the camera only shows a small section, the whole thing is considered by the lighting subsystem, especially if you're using infinite lights.

Should there be some reason you insist on depth-mapped shadows, you will need to increase the shadow map size - perhaps even need to increase the max value that you're allowed to enter. 1024 is not big enough.

If you did not choose depth-mapped for a reason, then switch to raytraced.

Is there a roof/ceiling? Shadows are localized absence of light. I have seen more than once users not realize that the entire room was in shadow because of a ceiling. The lighting may be just IBL that's left, which is unaffected by walls and ceilings, unless you enable IDL as well.

And, of course, did you enable shadows in render settings?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)