It doesn't answer exactly your question, but maybe will be helpful:
Project of reconstruction, extension or superstructure should be accompanied by a technical description and technical assessment including, in appropriate cases, an evaluation of the current engineering-geological conditions and the condition of the foundation of a building. Part of the architectural drawings and construction should be done at a scale appropriate to the specific nature and character of the work and the degree of accuracy of graphic signs in the drawings, but not less than 1:50 for the separate parts of buildings under reconstruction or expansion of facilities and parts of the complex and small sizes.
dom.pl/przebudowa-i-rozbudowa-a-pozwolenie.html
