Sewer construction Vienna what lies in the trench decides the price.

A house connection is calculated per running metre and is roughly €150 to €350 per metre, depending on depth, soil and surface reinstatement. The pipe price is the smaller part — excavation, support and backfilling make up the effort. It becomes reliable after a site visit.

Because a sewer does not work without the right fall. Too little and the water stands; too much and it runs away from the solids — both lead to blockages. The even fall is the heart of a working sewer, not a detail.

Yes, that is mandatory. A leaking sewer loses waste water into the ground, contaminates the soil and in the worst case can undermine foundations. After construction, leak-tightness is tested; the record is part of the acceptance.

As a rule, yes. The connection to the public sewer must be registered with Wien Kanal, and excavations on public land need a permit. We clarify and apply for this before construction starts — no digging without a permit.

A professionally laid sewer made of modern pipes lasts for decades. Problems almost always come from the wrong fall, settlement due to poor backfilling or ingrowing roots. That is why careful bedding and backfilling are as important as the pipe itself.

A camera is guided through the sewer to check its condition from the inside — cracks, roots, offsets, fall. For existing pipes it shows whether a repair is enough or renewal is necessary, before any digging.

The drain pipe collects the waste water within the property under the floor slab; the house connection links it to the public sewer. Both must be watertight and have the right fall — damage often occurs at the transitions.

Roots seek water and penetrate through leaking joints or fine cracks, where they then form dense root balls. Old sewers with socket joints are particularly susceptible. Modern, tightly welded or bonded pipes and the right choice of route help prevent this.

In some cases, yes — with trenchless methods such as a liner pulled in from the inside. This is possible with an intact alignment and minor damage. With fall problems, fractures or settlement, however, there is no way around excavation. What is possible is shown by the CCTV survey.

The pipe is laid in a sand bed and backfilled and compacted in layers with the right material. If this is botched, the ground settles, the pipe loses its fall and water backs up. Backfilling is therefore a quality-critical step.

Deep enough to be frost-free and to achieve the necessary fall to the connection point — often one to several metres. The exact depth results from the connection point on the public sewer and the route. Greater depth means more excavation and higher costs.

An accessible manhole along the sewer through which it can be inspected, cleaned and, if necessary, surveyed by camera. It is placed at changes of direction and at intervals. Without inspection manholes, a sewer can hardly be maintained later.

Yes, this is a common connection. A leaking sewer or defective drain pipe releases water into the ground, which then penetrates the basement masonry from outside. Anyone with damp basement walls should have the sewer checked as a possible cause.

If both are due, yes. House connection and foundation work often lie in the same excavation — doing them together saves a second round of digging and therefore costs. That is why it pays to plan both together.

After backfilling, the surface must be reinstated — paving, asphalt or green space. This can be a considerable cost block, especially with elaborate existing surfaces. This item belongs clearly in the offer, otherwise it comes as an extra charge.

A simple house connection is often finished in a few days; complex pipes with deep trenches, road crossings or difficult soil take longer. The permit beforehand can take more time than the actual excavation. We reflect this in the schedule.

Drainage carries seepage and groundwater away from the building to keep the masonry dry. It consists of perforated pipes in a gravel pack with a fall to a collection point. It is a separate topic that is often planned together with basement waterproofing and sewer construction.

The property owner for the pipes up to the connection point on the public sewer. From there, Wien Kanal takes over. This means: the drain pipe and house connection on your land are your business — that is where we come in.

Usually yes, with planning. For short phases the waste water can be diverted or the connection routed temporarily. It rarely works entirely without interruption, but downtimes can be kept short. We discuss this in the schedule.

A survey starts at around 350 euros, depending on length and accessibility. It is the inexpensive basis for every decision: only when the condition is known from the inside can it be said whether repair or renewal is necessary — instead of digging on suspicion.

With increasing heavy rainfall, correct sizing and sometimes the separation of rainwater and foul water are important so that the sewer is not overloaded. A backflow valve protects against water being pushed back into the house when the public sewer is overloaded.

A flap in the pipe that closes when water from the public sewer would push back — for example during heavy rain. It protects low-lying rooms from flooding due to backflow. In vulnerable locations it is strongly recommended.

The CCTV survey shows this. If only one section is damaged, renewing it or trenchless rehabilitation is often enough. With continuous fall or settlement problems, complete renewal makes more sense. We recommend what the condition calls for, no more.

Typical signs: recurring blockages, gurgling in the drains, unpleasant odours, damp basement walls or water emerging in the garden. With such signs, a CCTV survey brings clarity before major damage occurs.

Yes, the statutory 3-year warranty under § 933 ABGB on the workmanship. The leak-tightness record from the acceptance is important proof that the sewer was built properly and is watertight.

The ground and the depth. If the excavation hits rock, old pipes or groundwater, the calculation changes. Elaborate surface reinstatement can also be costly. Because we work with a fixed price after a site visit, we clarify this beforehand, not in the middle of the trench.

Yes. Draining and infiltrating rainwater is part of civil engineering — from the gutter through the pipe to the soakaway trough or the sewer. Whether infiltration or discharge is permitted depends on the location and the requirements; we clarify this as well.

Yes, this often makes sense. If digging around the building is needed anyway because of a defective sewer, the basement waterproofing from outside can be done at the same time. This saves a second excavation and eliminates causes of damp together.

We handle the necessary registration of the connection and the excavation permit so that everything proceeds according to regulations. The public sewer itself remains the responsibility of Wien Kanal — we professionally make the connection from your property to it.