Between the Versoix woods and the countryside, Collex-Bossy remains a rural village a few minutes from the airport.
Flat prices in Collex-Bossy run at CHF 10,500 per m², a level that has stayed in step with Geneva. A commune like this one moves with the cantonal cycle rather than against it, so the wider trend is a fair guide for your own estimate. Geneva publishes what actually sold. In Collex-Bossy that comes to 47 completed transactions over 2 years, at a median of CHF 970,000 per property in total price. Set that against listing prices and you get a measure of local negotiating room. Prices below the cantonal level move later and less than the top of the market. In practice a correction in Geneva reaches communes like this one with a delay, and so does a recovery.
Collex-Bossy ranks 35 out of 45 communes in Geneva on flat prices per m². Rankings shift a place or two from one year to the next without anything real changing, so read the band rather than the exact position. The last twelve months added 2.5 percent in Collex-Bossy. Rises of this order usually come from a shortage of listings rather than from a wave of new buyers, and they unwind faster than they build.
27 properties are currently on the market in Collex-Bossy. Supply at that level decides how long a sale takes, because the more listings compete, the more the first serious offer sets the reference for the rest. The largest group of homes in Collex-Bossy, 16 percent, dates from 1981-1985, with the rest spread across the other bands. Where stock is this varied, a commune price per m² carries less weight and the comparison has to come down to buildings of the same age.
Average size in Collex-Bossy is 129 m² across 4.2 rooms. Compare your own property with that figure before you read any price per square metre: an outsized home rarely sells at the local rate, and a small one often beats it. Over 25 years the median moved from CHF 3,700 to CHF 9,300 per m², a change of +151 percent. That is the market, not your property: a flat renovated in the meantime followed a different curve entirely. Collex-Bossy is a market where recent comparable sales exist and mean something. An estimate here has solid ground to stand on, provided it starts from your surface, your floor and the age of your building.
Building stock data: Federal Register of Buildings and Dwellings, FSO, updated August 3, 2026
Market data updated on August 24, 2026
A range set against land registry sales and the profile of your property.
Value my property →CHF 10,500 per m² is the current median for flats in Collex-Bossy. It covers every sale, new and old, so a renovated flat sits above that line and one still needing works sits below it.
The reference is CHF 10,800 per m² in Collex-Bossy. It averages a small number of sales, since houses change hands far less often than flats, so treat it as a bracket to work inside rather than as a price.
Homes in Collex-Bossy average 4.2 rooms, with 1981-1985 the most common construction period at 16 percent. The mix means condition varies a lot from one building to the next, and condition is what pulls two similar flats apart on price.