Ours is large (12' x 10') and 3 floors up, made entirely of wood with nothing but posts/diagonal supports. We've got a Somerville porch. :)

Interesting! I wonder where else those are called porches. They were always balconies in Michigan and upstate NY. In Troy, we lived on the 2nd floor of a very Somerville-looking building (2 identical apartments on top of each other). Our "balcony" there was directly above our landlord's "porch." Just to complicate things by way of Coraline's definition, both living rooms had sliding doors to the [outside thingee.]