CPV code 45214500 designates Construction work for buildings of further education in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45214500 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 45214000 (Construction work for buildings relating to education and research).