No experience with property insurance in Vaud, but Earth Scientist here
First check, the cantonal map of natural risks (carte dangers naturels) https://www.geo.vd.ch/
If the property is in high risk zone (danger élevé), there’s no reason to buy it. There are several risks, check this explanation document from canton Vaud https://www.vd.ch/fileadmin/user_upl…tives_2020.pdf
Glissements de terrain permanents (GPP) or permanent landslide - these are big masses of land slowly moving, a few cm per year. Something risky may happen during our lifetimes or in 10k years. All we know is the land is moving.
Glissements de terrain spontanés (GSS) - spontaneous landslide. This is the archetypal landlslide you see on the news. After intense rainfall land collapses and the velocity of mud coming downhill is several meters/second. These events are much more frequent and several times per year are on the news.
Chutes de pierres et de blocs (CPB) - rock fall: terrain below you home is stable, but the rocks above it fall.
Éboulements de roche, écroulements (EBO) - whole mountains falling down like is happening these day in Brienz (GR).
Affaissements et effondrements (EFF) - sinkholes in soluble rock.
Look at the map, the zones with low, mid and high risk are small. Not that hard to find a property. The white zone is “no risk” and covers a large area. So, don’t buy in a risk area, no matter the insurance.
Back to ECA, it seems they cover rocks falling (CPB) and sinkholes(EFF) but they exclude landslides (GPP, GSS, EBO), bottom of page 3, top of 4.
I’m no lawyer, so the wording confuses me a bit, you can see how in the translation by google “landslide” appears two times. One for éboulement, and one for glissement de terrain. Both not covered by ECA.
https://www.eca-vaud.ch/exteca/docum…aa2addaf11.pdf