Property in Onex: living between the Rhône and the Aire

The property market in Onex

The property market in Onex sits within a dense urban environment, comparable to that of other municipalities in Geneva’s inner ring such as Lancy, Vernier or Bernex. Its proximity to Geneva, public transport links and comprehensive range of schools make it a sought-after area, despite municipal taxation among the highest in the canton.

The average sale price observed in Onex stands at 14’035 CHF/m², a level that reflects the pressure on the residential market in an urban municipality with a high population density. The rental market is also well represented, with an average rent of 32 CHF/m² per month. In total, 337 properties were recently recorded as marketed in the municipality, 143 for sale and 194 for rent, reflecting sustained activity in both segments.

This dynamic is partly explained by the municipality’s demographic profile: a population that has been stable since 2020, a high proportion of apartment buildings and constant demand linked to the proximity of Geneva’s urban centre. The property market in Onex is thus driven as much by sales as by rentals, within a housing stock made up mainly of apartment buildings.

Types of property

Given the municipality’s very high density and the presence of large housing estates such as the Cité-Nouvelle, built in the early 1960s, an estimate suggests a split of around 20 to 30% detached houses and 70 to 80% apartments.

Life in Onex

The treaties of Paris and Turin of 1815-1816 definitively attached the municipality to Geneva. Onex became an independent municipality on 1 November 1851, separating from Confignon, when it had fewer than 260 inhabitants. The most significant transformation came in the 1960s, when the farming village became an urban town: the population rose from 958 inhabitants in 1950 to more than 13’500 in 1970, with the construction of the first buildings of the Cité-Nouvelle. In 1965, Onex passed the 10’000-inhabitant mark and officially became a town.

Cultural heritage.

– The former Saint-Martin church.
– The Mairie d’Onex.
– The Maison Duchêne, a built manor house.

Going out

– The Piscine Municipale d’Onex.
– The Boulodrome des Racettes.
– Onex-Parc hosts several outdoor group classes.

Moving to Onex.

Moving to Onex means benefiting from a comprehensive range of schools and dense public transport links, in a municipality where green spaces cover around a third of its area. Daily life is organised around several neighbourhood centres, each with its own local shops and schools.

• Community-minded
• Lively
• Urban

Schools

– 7 state primary schools.
– 2 secondary schools.
– 2 cycles d’orientation (lower secondary schools).
– 2 private schools

Transport

– 7 TPG lines, including two tram lines.
– Circular tram line.

Access

– Around 4 km from the centre of Geneva.
– Served by the route de Chancy and the route de Loex.
– Municipality located between the Rhône to the north and the Aire to the south.

Shops and services

– 2 supermarkets.
– 3 grocery shops.
– 3 bakeries.
– 7 pharmacies.
– Several doctors and dentists.
– Several restaurants.
– Banks and post offices.

The neighbourhoods of Onex

Onex is organised into several neighbourhoods with distinct identities, most of them shaped by the rapid urban growth of the 1960s. A property project in Onex may therefore be located in a historic area of detached houses, an estate of high-rise buildings or a more recent residential neighbourhood. Here are four of these areas.

Onex-Village

The historic core of the municipality, around the Place Duchêne, contains several listed buildings such as the former Saint-Martin church and the former presbytery. The Onex-Village school has around a hundred pupils.

Cité-Nouvelle

A high-density residential area, built in the early 1960s on eleven hectares transferred to the Fondation Cité-Nouvelle. The buildings rise nine to fifteen storeys, forming one of the first large housing estates on the outskirts of Geneva.

Gros-Chêne

A residential neighbourhood served by its own public transport stop, Gros-Chêne consists mainly of apartment buildings, in keeping with the municipality’s urban development since the 1960s.

Bois-de-la-Chapelle

An area organised around the avenue of the same name, which is home to the Bois-de-la-Chapelle school and a dental clinic. The neighbourhood benefits from the proximity of the municipality’s green spaces.

Demographic profile

Onex had between 19’092 and 19’141 inhabitants in 2025, making it the sixth most populous municipality in the canton of Geneva. Its population has grown dramatically since the municipality was created in 1851, from around 260 inhabitants to more than 19’000 today, with peak growth between 1950 and 1970. Since 2020, the population has remained broadly stable, at around 19’000 inhabitants. Between 2010 and 2023, population growth in Onex was 7.1%, lower than the cantonal average (+14.6%) and the Swiss average (+9.4%) over the same period. The municipality also has one of the highest densities in the canton, with around 6’800 inhabitants per km², and foreign nationals made up 36% of residents in 2024.

Are you selling a property in Onex?

Selling a property in Onex takes place in an active market, driven by high population density and constant demand for apartments. With an average sale price of 14’035 CHF/m², the municipality remains one of the most dynamic urban markets on the outskirts of Geneva. A property valuation refines this reference value according to the specific features of the home: floor area, floor level, orientation or general condition. Using a local estate agency provides a valuation suited to the precise area of the municipality.

• Strong demand
• Regular supply
• Family buyers

Sales market dynamics

The available data do not specify an average time to sell for Onex. Of the 337 properties recently recorded as marketed, 143 were for sale, just over 40% of the total volume, alongside 194 for rent. This split, combined with high population density and the demographic stability observed since 2020, points to an active sales market, with a volume of transactions comparable to that of the rental segment.

Municipal taxation

The municipal additional tax rate stands at 50.5 centimes in 2026, unchanged from 2025. This level makes Onex the 2nd most heavily taxed municipality in the canton of Geneva, against a cantonal average of 41.4 centimes.

The stages of a sale

The high-end segment remains particularly active in the municipality. A property correctly priced from the outset generally finds a buyer more quickly than one whose price is adjusted after several weeks.

1. No-obligation valuation An adviser visits your property and assesses it according to its location, floor area, general condition and market data. You receive a reasoned valuation, with no obligation on your part.
2. Value enhancement analysis Where relevant, our in-house design office (architects and engineers) examines your property’s potential: scope for extension, renovation or simple improvements that may increase its value before it goes on the market.
3. Sales strategy Together we set the asking price, the marketing schedule and the most likely buyer profile for your property, in order to choose the most suitable channels and pace of advertising.
4. Marketing Virtual tour, video, professional photographs, presentation brochure and a carefully written description, followed by publication on our channels, our partner network and our portfolio of qualified clients.
5. Viewings and negotiation Your adviser organises and attends every viewing, screens serious buyers and negotiates on your behalf until final agreement.
6. Signing at the notary We handle the administrative and legal follow-up of the file up to the appointment with the notary, in coordination with all parties.