Does the addition to the house count towards the square footage?

[Devin E.]

Good morning,

I'm interested in a property in Idaho and it has an addition that may not be permitted. I know in California that this addition if unpermitted does not count towards the square footage. I was told that in Idaho this is not as big of a deal and it is counted towards the square footage.  

Any advice would be helpful.

Thanks,

Devin