CPV code 45215221 designates Daycare centre construction work in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45215221 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 45215220 (Construction work for social facilities other than subsidised residential accommodation).