One volume of a building: stacked tiers and the roof on the last one.
Optional
Walls without windows (steeples, tanks, silos, barns).
The rectangle pitched, skillion and saw-tooth roofs sit on (null = flat roof only).
null
Roof shape.
Roof rise above the walls (ridge or peak), metres.
Stacked tiers, widest first.
One volume of a building: stacked tiers and the roof on the last one.