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This is possibly a valid point but where are those numbers coming from? Citations please.

• jaclaz 9y ago
  >This is possibly a valid point but where are those numbers coming from? Citations please. Well I was not attempting to write a Wikipedia article, the numbers are "simplified" and "generic enough", only to provide an "order or magnitude" on the matter. Of course they will change on a country by country base and of course they depend on the kind of building, the local availability of material, equipment and personnel and the scale of the project. They come from some 35 years of experience in the business, across Europe, including some of East Europe and Northern Africa, besides a few other countries. You won't find easily (on the public internet) similar breakdowns, as the only people actually interested in them are contractors and - to a lesser extent - developers, all the rest of industry is based on proposal by contractors or sub-contractors that do not specify how much of this or that goes into each offered price, and even large contracting firms cannot nowadays compute similar breakdowns due to the amplitude of sub-contracting.