Various consultancies and the USGBC have been prolific in generating published material, all vociferously supporting the conclusion that the costs of traditional and sustainable construction are with time approaching parity – while at the same time specifically excluding design and documentation costs and noting that “…comparisons of this type [using an average square foot cost method] cannot be considered reliably meaningful…to assess what – if any – cost impact there might be for incorporating LEED and sustainable design”