How big are the rooms without expansion?

I think they're 4 by 4, but I'm not 100% sure, I think you get 3 squares every direction for every upgrade.
 
no bing, the rooms are 100% google


i'm sorry



lol oops...nobody saw that! Stupid autocorrect...I don’t even use bing.

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Thank you all for verifying this! I need to set up a Room beforehand at the museum...but I didn’t want to build a new room until I knew I liked how the room would look....but I needed to know the squares to use.
 
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