I think this is OK. "Living areas" is out because you're using it for "habitables" (I think you're right there). "Common areas" (or communal areas, which is the same thing, I think) has a different meaning:
https://en.wikipedia.org/wiki/Common_area

But "social areas" is used with what seems to be the same meaning:

"[Homeowners] are also showing more willingness to incorporate pops of color in social areas of the home 'because it's an environment you want to feel energetic in,' says Jackie Jordan, director of color marketing for Sherwin-Williams."
http://www.californiarealestatedirect.com/blogpost/more-home...

"The layout helps form a private rear courtyard, and keeps separate the social areas from the more private bedrooms." (Kew House)
http://uncrate.com/shelter/real-estate/

"Open kitchens facing multi-use dining and social areas with a great room or living room are taking over the traditional dining room."
http://styledstagedsold.blogs.realtor.org/2011/01/16/dining-...

--------------------------------------------------
Note added at 1 hr (2017-05-11 06:15:56 GMT)
--------------------------------------------------

"This home has a great flow for entertaining, the social areas pour out to big decks and landscaped gardens"
This is in Vancouver, Canada, but it's probably valid for California too.
Page 13, ad in centre of page
https://issuu.com/nsnfeatures/docs/nshnsnfri20170317/13

"Upstairs the master suite has high ceilings, large space for dressers and king size bed. Even a full bedroom or office on the first floor, separate from the social areas of the home."
http://tours.previewfirst.com/pw/60515 (from a description of a home in San Marcos, CA by a real estate broker)