Lightmap full of stains , what might be a problem ?

Yes, the ‘Build’ quality should be set ‘Production’ for the best results, but I don’t really understand the second part of your comment. What do you mean by how much time it takes for one room? The light building process? It can easily take several minutes with high settings, even hours for larger levels.
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yes I was talking about building (baking) a light of course .
So here is my scene again

there are still problems with lit places , i think this is because of UVs
but overall quality is acceptable for now

have some questions :

  1. do I need to use lightmass importance volume when baking lights ? I was doing last picture without it
    it took couple of minutes to calculate light there.

  2. when you are doing project “export a package” how can I create menu for it ?

  3. Anyone uses allegorithmic material for architectural vizualization inside UE ?
    I downloaded allegorithmic pack recently but I’m not sure it will fit architectural needs