Before the first house is built, the first street lamp is switched on, or the first liter of drinking water flows from the tap, civil engineering and sewer construction are required. Sewers for wastewater and rainwater, drinking water pipes, access roads, seepage basins, and water towers—all this work takes place below the surface and remains invisible when done well. Klefenz GmbH carries out underground and sewer construction projects for municipalities, water associations, commercial enterprises, and private builders.
As a DVGW-certified pipeline builder (GW 301 and GW 381), Klefenz is qualified and certified for drinking water pipeline work. Pressure testing, disinfection, and acceptance in accordance with DVGW standards are standard practice. Klefenz has the necessary equipment for sewer construction—from trench shoring and excavation to specialized machinery for confined spaces.
For new construction areas, Klefenz often acts as the general contractor for technical development: sewage and storm sewers, drinking water pipelines, road substructures, and asphalt paving—all in one project, from a single source, with one point of contact for the municipality. This saves coordination effort, reduces interface risks, and speeds up completion. Klefenz also coordinates with other utility providers (electricity, telecommunications) working in the construction area simultaneously.
Klefenz has been working in civil engineering and sewer construction in the Waldshut district for decades and is familiar with regional building authorities, water associations, and supply structures from hundreds of projects. This local knowledge pays off—in smooth approval processes, fast response times, and a network that also helps with urgent requirements. Talk to us
Whether it is a demanding construction project or a professional perspective – Klefenz stands for experience, reliable collaboration and a clear commitment to quality. If you would like to realise a project or become part of our company, we look forward to speaking with you and taking the next step together.
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