On its slope overlooking the Rhône, Onex combines 1960s estates and an old village, with some of the most affordable prices in the canton.
Flat prices in Onex run at CHF 11,900 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 Onex that comes to 168 completed transactions over 2 years, at a median of CHF 1,066,000 per property in total price. Set that against listing prices and you get a measure of local negotiating room.
Position 21 of 45 in Geneva puts Onex among communes with similar price levels and often very different housing stock. Two communes can share a rank and still value the same flat differently once age and condition are taken in. Houses carry a premium of 9 percent per square metre over flats in Onex, CHF 13,000 against CHF 11,900. Households buying a house here are mostly trading up from a flat nearby, so demand holds even when volumes drop.
Flat prices in Onex are up 2.1 percent over twelve months. One year is a short window: measure it against the longer trajectory before you read it as a change of direction. There are 68 active listings in Onex 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 Onex, 15 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.
At 3.1 rooms and 81 m² on average, homes in Onex are sized for households rather than single occupants. If you are looking for a studio or a two-room flat, expect a thinner choice and less room to negotiate. From CHF 3,700 to CHF 9,600 per square metre in 25 years, +159 percent in all. The path was not a straight line, and the flat or falling stretches inside it are precisely what a long average hides.
Onex 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 →Around CHF 11,900 per m² for a flat, which is 1 percent from the Geneva median. Houses are priced separately and usually land somewhere else entirely, so work from the figure that matches your property type.
The reference is CHF 13,000 per m² in Onex. 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.
The dominant band in Onex is 1971-1980, which covers 15 percent of homes. Average size runs to 3.1 rooms, so the commune is built mainly for households rather than for single occupants or short stays.