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Is an enclosed porch "Habitable Space"?
February 21, 2020
10:14 am
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lile@lile.biz
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September 21, 2017
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Per R301.2.1.1.1 there are 5 categories of sunrooms.  I through III are defined as noninhabitable space, and are unconditioned.  My understanding of R303.9 is that in order to be habitable, a space (up here in the frozen Zone 4 North) must at least be heated so unheated spaces are by definition uninhabitable.   

Habitable space is of course defined as 1) in a dwelling and 2) for living, sleeping, eating or cooking.  

 
Sunroom categories IV and V seem confusing.  
 
Category IV is thermally isolated, enclosed walls, conditioned, but is *noninhabitable*. 
 
Category V is all of the above, open to main structure, and is *habitable*.  
 
Let’s say I enclose a porch, add a mini-split, put some nice wicker furniture in there, this apparently authoritative reference is showing this as a Category IV (page 12) https://portal.ct.gov/-/media/DAS/OEDM/2018-CD-HO/SP18-Significant-Changes-to-the-2015-IRC_-2-Slide-Handouts.pdf?la=en

Is an enclosed porch always “habitable”?  Can I eat, or live out there?  Or does being thermally isolated from the dwelling unit make it “nonhabitable” despite being conditioned? If I can eat and live and kids can play in there, how can such a space ever be considered “noninhabitable”?