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I have no idea why is it grainy on the left side. But on the right side it is ok. I added additional lights on the left side but the problem is still there. Any tips? I am struggling about lighting the rooms.

enter image description here

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Artifatcs are caused by overlapping faces.

On the right side you have this situation (correct):

enter image description here

while on the left side (overlapped/dubled geometry):

enter image description here

You can clearly see the problem also in Solid view display mode.

enter image description here

As faces shares the same location, camera rays can't tell which one is visible from camera, so shows a bit of one and a bit of the other.

You have to create a gap between faces

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  • $\begingroup$ i deleted the overlapping objects and it's ok already. Thank you. Sorry for this noob question $\endgroup$ – Francis Jessie S. Enriquez Jr. Jul 17 '15 at 11:03
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your green wall's face is overlaping the other wall (behind it). move it a tiny bit away.
(i also suggest you to make your roof a bit less shiny with a lower specular intensity and hardness)

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