I've settled on having any Roofing with Flooring (not Paving) below it acting as a light source when you're under it. At some point I'll add in some Wall checks too so the game can sort of check if it's a Building. 
It's a little hard to tell what's happening because of the Players light source, but you can see how it works with the ones nearby.
I still might add a way of defining an area as a Building and using that instead, but that would mean adding another option to the Build Menu, as well as having a way of clearing it.
I'd only be able to have square buildings though
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