To arrive at the cubical contents of a building, multiply the area of the building by the height of the building, measured from the bottom of the cellar to the top of the roof beams, and you have the cubic contents of the building. In addition to this, add the cubic contents of all bulkheads, extensions over courts on first floor, or vaults under the sidewalk. Any accurate estimate of the cubic contents of a building should be based on an accurate measurement of the size of the courts and yards, so as to obtain the exact area that the building will cover.