flat shape
The lower the building perimeter coefficient k, the more economical the design.
Building structure
Buildings below five floors generally adopt masonry structure; For large and medium-sized industrial workshops, reinforced concrete structures are generally selected; For multi-storey houses or long-span structures, steel structures are obviously superior to reinforced concrete structures; For high-rise or super-high-rise structures, frame structures and shear wall structures are more economical.
Column grid layout
For a single-span factory building, when the column spacing is constant, the larger the span, the lower the cost per unit area. For multi-span factory buildings, when the span is constant, the more middle spans, the more economical.
Building scale
The increase of building scale will generally lead to the reduction of unit area cost.