Exterior, Glass Siding Material, Cabin Building Type, A-Frame RoofLine, House Building Type, and Wood Siding Material Adding 290 square feet to this already small (just 566 square feet) black A-frame in Brecht, Belgium, was all the local building ordinances allowed, but the architects at dmvA found that a single wing extended out to the side gave resident Rini van Beek all the storage and living space that she needs.  Best Photos from A Modern Glass Addition in Belgium