It will get more crowded in the west
According to the reference scenario, population growth over the next 15 years will be strongest in the canton of Freiburg by just under a quarter. Growth rates between 15 and 20 percent are anticipated in the cantons of Waadt, Wallis (primarily Sion) and – in the German-speaking part of Switzerland – in the cantons of Thurgau, Aargau and Zurich. The mountain cantons of Uri, Appenzell Innerrhoden and Nidwalden should not see growth above the five percent mark. A stagnant population is anticipated in the regions of Glarner Hinterland, Goms, Engadin, Schanfigg and Davos.
Needs covered almost everywhere
Only in the regions with anticipated above-average population growth, such as in the western parts of the canton of Zurich, the southern parts of the canton of Aargau and the regions of Sursee-Seetal and Gros-de-Vaud is it possible that the undeveloped building zones will be less than what is needed for the new population.
In the cantonal structure plans, the building zone surface area can also be determined by reference to the FSO population scenario. This scenario assumes a population increase of roughly 1.5 million people over the next 15 years – in other words, up to the 10 million mark. Under this extremely optimistic assumption, the anticipated need for building zones in all regions of the cantons of Zurich, Thurgau and Aargau and partly in Waadt and Freiburg will not be covered. The mountain regions, in contrast, will continue to have a large overcapacity of underdeveloped reserves.
Relief from increasing density
In view of the increasing density aimed for by the new spatial planning law, the surface area effectively required to absorb the population growth will sink. According to an ETH Zurich study and the Federal Office for Spatial Development (FOSD), floor area reserves by themselves (implemented floor space adjusted to admissible floor space in accordance with planning) and potential residential space that has already been built up (space with the potential to be redeveloped) offer capacity for up to one million additional residents.
Building land only more expensive in isolated cases
The amount of residential space on offer over the next 15 years should be able to keep step with demand. Analysis shows that there is no lack of building zones for new construction. A large portion of the growth in population could even be absorbed by the existing housing stock without increasing building zones. Increases in land value, consequently, are not automatic, but should be restricted to individual regions and locations.