Basement costs in Switzerland: the most expensive floor of a house

When the economics of a construction project are analysed, many people first think of expensive attic floors or luxurious penthouse apartments. A closer look shows something different: the least profitable floor is usually right at the bottom. In the basement.

A beautiful but also costly underground car park.

This is where high construction costs meet areas that generate hardly any direct income.

Building a basement is technically demanding:

• It requires an excavation,

• possibly dewatering,

• waterproofing against hydrostatic water pressure,

• backfilling

• and, in densely built-up neighbourhoods, often a complex excavation shoring system as well.

All of this costs not only money, but also time.

The effort is particularly high on smaller plots or in densification projects. Soil nail walls have to be installed, agreements have to be reached with neighbours, or special shoring solutions have to be planned. That also extends the construction time and increases the risks.

Where this creates areas for plant rooms, basement storage units or bicycle rooms, those areas are functionally important but economically rarely attractive. They are hard to let and hard to sell.

Of course every project needs plant rooms. And parking spaces and basement storage units matter for sales as well. Nobody buys or rents an apartment without storage space or without a parking space. Many municipalities also require a certain number of parking spaces per residential unit.

But that is exactly why sound and economical planning is decisive. The point is not to question the basement in principle, but to reduce it to what genuinely makes sense for the project.

The underground car park is a frequently discussed topic. On paper it sounds economical: depending on the location, a parking space can be sold for CHF 40,000 to CHF 50,000. Do the arithmetic more carefully, though, and that quickly loses its shine. A parking space needs around 15 square metres of floor area. At a sale price of CHF 50,000, the price per square metre is around CHF 3,300. And that is only the start.

On top of that come drive aisles, ventilation systems, entrance ramps, plant rooms, fire compartmentation and much more. The actual cost per square metre therefore rises significantly, while the achievable price stays the same.

Basement storage areas show a similar picture: they look practical, and they are. But a larger cellar rarely decides whether a project sells. And hardly any buyer willingly pays more because the basement storage unit is ten square metres bigger. From an economic point of view, that is a bad deal.

Conclusion

A good basement is not as large as possible. It is exactly as large as necessary and as compact as possible.

Because this is exactly where quiet potential for optimisation often lies. Anyone who analyses their construction costs and questions the areas in the basement realistically can quickly save several hundred thousand francs, without giving up any living quality.

Would you like to know whether your basement really pays off? I am happy to take an independent look at your project.

Basement costs in Switzerland: what does a basement really cost?

A basement is one of the most cost-intensive elements in Swiss house construction. Basement costs in Switzerland vary widely depending on the ground conditions, the groundwater level and the fit-out standard.

As a guide value: a fully fitted out basement in Switzerland costs between CHF 800 and CHF 1,500 per cubic metre.

Excavation costs for a single-family house: what should you expect?

Before the basement can be built, the ground has to be excavated. The excavation costs for a single-family house depend on the depth, the volume and the ground conditions.

In the Zurich region, clients typically reckon with CHF 30 to CHF 80 per cubic metre of excavation. With difficult ground (rock, groundwater) the costs can turn out significantly higher.

Underground car park costs per parking space

An underground car park is the most expensive form of parking. In Switzerland, underground car park costs per parking space are usually between CHF 35,000 and CHF 60,000, depending on the depth, the access and the local market.

Whether an underground car park is economically worthwhile depends on whether the added value per residential unit exceeds the additional cost. With apartment buildings in urban locations that is usually the case.

Item	Key figure from this article	Note
Basement, fully fitted out	CHF 800 to CHF 1,500 per cubic metre	Depending on ground conditions, groundwater level and fit-out standard
Excavation, Zurich region	CHF 30 to CHF 80 per cubic metre	Significantly higher with rock or groundwater
Underground car park per parking space	CHF 35,000 to CHF 60,000	Depending on depth, access and local market
Sale price per parking space	CHF 40,000 to CHF 80,000	Depending on the location
Floor area needed per parking space	around 15 square metres	Excluding drive aisles, ventilation, entrance ramp and plant rooms
Revenue per square metre of parking area	around CHF 3,300	At a sale price of CHF 50,000

These key figures for basement costs in Switzerland are guide values as at 2026 and depend heavily on the ground conditions, the groundwater and the fit-out standard, which is why they do not replace a project-specific calculation.

FAQ: basement and construction costs

Is a basement worthwhile? That depends on the intended use. As a plant room or storage room, a basement can be built more cheaply than a fully fitted out residential basement.

When does a basement become the most expensive floor? When groundwater, poor ground conditions or high fit-out requirements come together, the costs quickly exceed those of every other floor.

Why is building a basement technically demanding? A basement requires excavation, possibly dewatering, waterproofing against hydrostatic water pressure and backfilling. In densely built-up neighbourhoods, a complex excavation shoring system is often added. All of this costs not only money, but also time.

Why do areas in the basement generate little return? The basement is mainly where plant rooms, basement storage units and bicycle rooms are created. These areas are functionally important, but they are hard to let and hard to sell. High construction costs therefore meet areas that generate hardly any direct income.

Why is an underground car park economically difficult? On paper a parking space looks economical, because it can be sold. But drive aisles, ventilation systems, entrance ramps, plant rooms and fire compartmentation come on top. The actual cost per square metre rises significantly as a result, while the achievable price stays the same.

How large should a basement be? A good basement is not as large as possible, but exactly as large as necessary and as compact as possible. Plant rooms, parking spaces and basement storage units remain necessary, and many municipalities also require a certain number of parking spaces per residential unit. What matters is questioning the areas in the basement realistically.