Key location factors for Onex at a glance.
Onex is predominantly a single-family housing area: 64 % of residential buildings are single-family homes, 3 % have 2 units.
The median build year 2004 is above the Swiss average (1991). 24 % of buildings date from before 1980.
Heat pumps are recorded in 7 % of updated GWR entries (from 2015).
Source: Own analysis of public Swiss real estate data · Net rent excl. utilities · Market analysis as of July 2026
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Noise, sunlight and public transport vary significantly within Onex — street by street. Check a specific address:
| Buy | Rent per month | |
|---|---|---|
| Studio | CHF 1M–1.1M | CHF 1'000–1'200 |
| 2 rooms | CHF 1M–1.1M | CHF 1'300–1'500 |
| 3 rooms | CHF 1.05M–1.15M | CHF 1'700–1'900 |
| 4 rooms | CHF 1.15M–1.25M | CHF 2'200–2'400 |
| 5 rooms | CHF 1.25M–1.35M | CHF 2'900–3'100 |
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Onex has experienced strong price growth over the past decades, with particularly notable increases over the last five years. The market continues to show upward momentum, though recent developments indicate a more moderate pace.
For a single person earning a higher income without church tax, the tax burden in Onex falls within the Swiss mid-range. This means neither particularly high nor especially low compared to other Swiss municipalities, though individual circumstances vary.
The rental market in Onex is very tight, with minimal available listings. Prospective tenants should expect a competitive search process and may need to be flexible or patient when looking for accommodation.
Given the very limited rental availability and above-average purchase prices, the decision depends on personal finances and time horizon. Buyers face higher entry costs but gain stability, while renters may struggle to find options in this tight market.
Onex offers Geneva canton advantages for both groups, though the tight rental market affects newcomers particularly. Families considering purchase benefit from long-term value stability, while professionals should assess whether the price level aligns with their career plans.
Rents in the range of CHF 48-58/m²/mo. serve as a reference value for market-rate listings in Onex. Individual listings may vary significantly depending on location, condition, and floor.
Rental prices in Onex are currently typically in the range CHF 48-58 per m² per month (range depending on location, condition and floor). A 70 m² apartment thus comes to roughly CHF 3,400–4,000 per month as net cold rent — the effective market range starts lower for small apartments and rises disproportionately for large ones.
The m² price for owner-occupied apartments in Onex is typically in the range CHF 11'300-12'600 per m². The actual range depends heavily on location, year built, finish standard and views.
The m² price for houses in Onex is typically in the range CHF 11'400-14'700 per m² (defensive range ±12 %). House prices vary considerably depending on plot size, buildability and micro-location within the municipality — a direct m² comparison serves only as an initial orientation.
The effective tax burden in Onex is 20.5 % on income — for a gross income of CHF 150,000 (single, without church tax) this amounts to roughly CHF 30,786 per year. The Swiss median is 19.8 %; the burden in Onex is above. Source: Swiss Federal Tax Administration tax burden statistics 2025.
No — in Onex the share of second homes is 8.9 %, below the 20 % threshold. The second-home law does not apply here, and new second homes are generally permitted. Source: Federal Office for Spatial Development (ARE), 2025.
A first reference point is the local price per square metre: in Onex the median is around CHF 11'968 per m² for condominiums. A realistic estimate also factors in location, year of construction, condition, fit-out quality and view. For a free, property-specific indication you can use the Immoskop analysis tool: enter the address and property details to receive a data-based reference value — as guidance, not a substitute for an official or bank-verified valuation.
Comparison with neighbouring municipalities — purchase price difference to Onex colour-coded.
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