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Project groundwork in Switzerland: a strong start

  • Writer: Simon Käslin
    Simon Käslin
  • Jul 16, 2025
  • 4 min read

Updated: 1 hour ago

The decisive mistakes in construction projects often do not happen on site, but long before it. Whatever is overlooked or treated as a side issue during the design and planning phase can turn out later to be an expensive obstacle.


Construction site where a problem with the existing services is only discovered during the works.
When problems are only discovered during construction, it is often too late.

Solid project groundwork in Switzerland is the base on which a project becomes viable at all in economic, technical and legal terms. Anyone who checks only superficially here, or relies too heavily on assumptions, risks high additional costs, delays or, in the worst case, a project that is stopped.

A typical example shows how quickly routine turns into risk.


A plot with services in place but not legally secured

A plot inside the built-up area was to be redeveloped. The conditions looked ideal: the existing building could be demolished, the services were in place and the building permit was imminent. During the detailed clarifications, however, it emerged that the foul water drains ran in part across a neighbouring plot without a formally secured easement.

What looked at first glance like a mere formality became a real problem. A CCTV survey also showed that the drain needed refurbishment.


A chain of dependencies arose:

  • Without a right to route the drain across, no refurbishment

  • Without refurbishment, no release to start construction

  • Without a contractual arrangement, no legal basis for routing the drain across


Construction was delayed considerably. Only after complex negotiations with the neighbours and legal protection through a subsequently registered easement could the project continue. Time, money and nerves had already been lost.


Technically serviced does not mean legally secured

This case is not an isolated one. In everyday practice it is often assumed that with older buildings or existing service connections everything is already in order. Yet many of the pipes, accesses and cross connections in use today were never formally regulated, or were only agreed verbally. In a new construction project that is not enough.

On top of that, ground risks, legacy contamination, missing ground investigation reports or unclear zone boundaries can turn into stumbling blocks after the event. And the later such issues come to light, the more heavily their correction weighs.


Why project groundwork in Switzerland is so decisive

Sound project development does not begin with the first design, but with a careful check:

  • Are the services and access fully secured in legal and technical terms?

  • Which contaminated sites or pipe routes are (not) shown in the land register?

  • Are there restrictions from planning and building law, from environmental law or from adjoining ownership?

  • How precisely are record drawings, cadastral entries and easements documented?


These questions do not look spectacular, but they are decisive. They determine whether a project starts on a stable footing or lives with uncertainty.


Conclusion

Solid project groundwork in Switzerland is not just a planning detail, it is a strategic success factor. The more precisely you check and document in the early phase, the more robust the project becomes: technically, legally and economically.


Planning a construction project in Switzerland: the right preparation

Careful planning of a construction project is the most important investment before the first sod is turned. Anyone who does not clarify the groundwork risks cost increases, construction delays and, in the worst case, a building permit that is not granted.

In Switzerland the preliminary design phase typically covers a feasibility study, a comparison of variants and preliminary clarification with the authorities, all elements that save time and money before large expenses arise.


Checking the plot before you buy

Anyone who buys a plot without having checked it in planning and building law terms takes a considerable risk. The zoning plan, the building regulations, boundary setbacks and the servicing situation determine what can actually be realised on a plot.

Before you buy, always have a short feasibility check carried out by an experienced architect or owner's advisor. It costs little and can protect you from an expensive bad purchase.


Building law in Zurich: what you need to know

Building law in the Canton of Zurich governs use zones, utilisation ratios, building heights and boundary setbacks. What is permitted on your plot is set out in the municipal zoning plan and in the building and zoning regulations.

Important: the municipalities have considerable room for manoeuvre. What is allowed in one municipality can look different in the next. Contacting the building authority early clears up uncertainties before planning costs arise.


FAQ: preparing a construction project

What belongs to the project groundwork? Zone conformity, services and access, a preliminary structural study, the cost framework and affordability. All of this should be clarified before a construction project starts.


From what point do I need an architect? A qualified planner is mandatory at the latest for the building permit phase. It makes sense, however, to bring one in as early as the preliminary design phase in order to avoid planning errors.


Why are existing services not enough? A pipe or an access can be technically in place and still be legally unsecured. In the case described, the foul water drains ran across a neighbouring plot without a formally secured easement. Only a contractually regulated right to route them across creates the basis for refurbishment and for the release to start construction.


Which questions should be settled before the first design? What needs to be clarified is whether the services and access are fully secured in legal and technical terms and which contaminated sites or pipe routes are shown in the land register. Restrictions from planning and building law, environmental law or adjoining ownership belong to this as well. Finally, it matters how precisely record drawings, cadastral entries and easements are documented.


What happens if problems only come to light during construction? The later an issue comes to light, the more heavily its correction weighs. In the example described, construction was delayed considerably because complex negotiations with the neighbours and a subsequent legal safeguard first became necessary. By that point time, money and nerves had already been lost.


Why are verbal agreements a risk with older buildings? With older buildings and existing service connections it is often assumed that everything is already in order. Many of the pipes, accesses and cross connections in use today were, however, never formally regulated or were only agreed verbally. For a new construction project that is not enough.

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