If you want to place construction site facilities on public areas during a construction project, you must apply for a special use permit in advance.
You can also use public roads for other purposes than just traffic. A special use permit is usually required for this.
If you intend to excavate public land as part of a construction project, you must first apply for an excavation permit. Here you can find information on costs, duration, and required documents.
If you want to lay cables for public utilities, you need a route instruction.
With the ELBE+ portal you can ask questions about the route of pipelines in Hamburg and the surrounding area.