Sewer rehabilitation Winterthur – Renovating pipes without digging, without noise, and without cost explosions

The need for renovation always arises when your property drainage no longer meets the requirements of the cantonal Water Protection Act – meaning when wastewater leaks from the pipe or extraneous water infiltrates. In Winterthur, this is a particularly common issue during property transfers or building permit applications. In such cases, the Winterthur Municipal Drainage often requires a current proof of tightness for the property drainage system. Other typical triggers include water stains in the basement, recurring drainage problems, unpleasant odors from floor drains, or documented damage from a camera inspection.

No – in over 90 % of our Winterthur projects, nary a square meter is dug up. Our standard procedure is trenchless rehabilitation via existing shafts. Especially in the narrow old town alleys around Archplatz or in densely built-up districts like Mattenbach and Veltheim, this is practically the only sensible option, and the City of Winterthur also favors this approach because street openings require permits, traffic diversions, and associated costs. Only with completely collapsed or severely deformed pipe sections is local excavation unavoidable. However, we clarify this with you in black and white before awarding the contract.

Single-family homes and smaller multi-family homes are often completed in a single workday. For more complex properties, such as residential developments in Oberwinterthur or commercial properties in Grüze, the typical construction time is between two and five days. We plan major projects with several hundred linear meters in stages, usually over two to four weeks. For comparison, a classic excavation in Winterthur quickly takes two to three months due to the necessary traffic management, road restoration, and official approvals, with significantly higher costs.

The technical service life of a pipe rehabilitated with liners is 50 years or more in practice, and even longer under normal conditions. The warranty is based on SIA Standard 190 for drainage systems. The conditions in Winterthur – normal domestic wastewater, moderate temperatures, no exceptional groundwater pressure – are ideal for liner rehabilitation. For commercial or industrial connections with chemically contaminated wastewater, we specifically select liners with increased chemical resistance. Even then, we remain well within the range of several decades.

Yes, without exception. Without a current camera inspection, no one can credibly say exactly what needs to be renovated, nor which procedure is economically sensible. If Stadtentwässerung Winterthur has prescribed the renovation, in most cases a TV report is already available, which we can use as a basis directly. If you do not have any documents or they are older than five years, we will carry out the camera inspection, including digital inspection evaluation. Our inspection report complies with the VSA guideline and is recognized by all Winterthur authorities.

Almost always, yes. For renovations of external pipes, meaning from the house to the connection to the public sewer, you as a resident will notice practically nothing. For work on downpipes or pipes inside the building, for example with the Sprayliner method, individual toilets or sinks will be unusable for a few hours during the curing process. We plan such work in coordination with the management or tenants, inform them in advance, and keep the restrictions as short as possible. Complete evacuations were not necessary in a single case in our Zurich projects in recent years.

That depends entirely on the cause of the damage and your policy. Acute events such as burst pipes, consequential damage from backflow, or damage caused by third-party intervention will be covered by building insurance or the comprehensive coverage of your building liability insurance, depending on the coverage. Damage due to age or wear and tear, which is the most common cause of sewer rehabilitation in Winterthur, is generally not covered and is considered normal property maintenance. In any case, we will provide complete documentation including a camera inspection, damage analysis, and detailed itemized invoices. This will allow your insurance company or the Zurich Cantonal Building Insurance (GVZ) to conduct a proper coverage review.