CPV code 45213280 designates Construction works for compost facility in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45213280 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 45213200 (Construction work for warehouses and industrial buildings).