1. A building on a site, being a building which is intended to be used only in connection with the disposal of buildings or building plots on that site.
2. A building on the site of construction or civil engineering works, which is intended to be used only during the course of those works and contains no sleeping accommodation.E+W
3. A building, other than a building containing a dwelling or used as an office or showroom, erected for use on the site of and in connection with a mine or quarry.E+W