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