A commune of the Trois-Chêne on the French border, Thônex is going through a deep transformation with the large Communaux d'Ambilly district.
Thônex tracks Geneva closely, at CHF 12,800 per m² for a flat. Communes in this band are the easiest to value: enough sales to anchor a price, and no local anomaly pulling the figures around. Over 2 years, 328 property sales in Thônex completed and were registered. Half went above a total price of CHF 1,050,000 and half below. Asking prices sit higher, since they still include everything buyers negotiated away. A gap of 8 percent over the Geneva median is not statistical noise. It measures what buyers accept to pay for the location itself, and it holds through the cycle instead of appearing in one strong year.
Out of 45 communes measured in Geneva, Thônex sits at position 17. The communes immediately above and below are the ones a buyer will actually compare against, far more than the cantonal average. Up 3.1 percent in a year, Thônex has been priced by whoever was willing to pay most for a small number of properties. In a commune with few sales, that is exactly how a median gets moved.
There are 109 active listings in Thônex right now. Set that against the number of sales the commune records in a year and you get a rough measure of how crowded the market is for a seller. The largest group of homes in Thônex, 16 percent, dates from 1971-1980, 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.
The average home in Thônex has 3.2 rooms for 87 m². That ratio describes the shape of local demand better than the price does: many small rooms point to family housing, fewer and larger ones to conversions and new build. Over 25 years the median moved from CHF 3,700 to CHF 9,700 per m², a change of +162 percent. That is the market, not your property: a flat renovated in the meantime followed a different curve entirely. Knowing the median in Thônex gets you halfway. The second half is what separates your property from that median: condition, orientation, outside space, parking, and the works still to be done.
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 12,800 per m² is the current median for flats in Thônex. 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 13,300 per m² in Thônex. 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 Thônex average 3.2 rooms, with 1971-1980 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.