I've always wanted light to pass into closed rooms until i found this way its very easy. just follow these steps:

1.in this picture the light doesn't enter the room but that's no problem cus it we will force it to enter

2.build a square wall around a useless wall

3.remove the out-facing wall of that square

4.now enter the "constrainfloorelevation false" in the cheat bar and build a foundation in that opened square

5.now flatten the second floor

6.if you do it right the result should look like this

7.now delete the three walls(not the foundation!)

8.and the light finally passed

now enter "constrainfloorelevation true" in the cheat bar to turn off the cheat

and that's all folks!

sry for my English

Be aware that the game will not recognise this sort of room as a room. Right now the consequence is only that front doors aren't set properly, but once seasons are available, it may become more of an issue.

Yes because it will allow snow and rain inside that room but i hope EA fixes that in a later expansion or even a patch. I think you can change the front door of the house by clicking on them. I've also noticed that windows wont provide light to the room any more.

That is speculation more than anything, you never know if they will have it right the first time, if at all, so I would say to disregard the comments about there possibly being weather, the best would be to not think about it too much in my opinion