CPV code 45237000 designates Stage construction works in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45237000 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 45230000 (Construction work for pipelines, communication and power lines, for highways, roads, airfields and railways; flatwork).