The survey covers the sectors defined by the following codes of the French Nomenclature of Activities (NAF rev. 2):
\n- construction of residential and non-residential buildings (code 41.2);
\n- electrical, plumbing and other installation work (code 43.2);\u00A0
\n- finishing work (code 43.3);
\n- other specialized construction work (code 43.9).