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Canton of Geneva · 1213 · Sud du canton
Real estate in Onex: prices per m², actual sales and valuation
In Onex, the price per square metre of an apartment is 10'329 CHF (median of signed sales, range 9'482 – 10'909, Sud du canton region); a villa sells there for CHF 2'000'000 median (actual sales). The actual sales from the land register, 107 over the past 12 months, are detailed below. To place your property within these figures, the free online valuation gives a first range in a few seconds.Sources: land register — FAO Geneva, sales 18.04.2024 → 28.07.2026 · OCSTAT · updated 2026-08-10
Price per m² · apartment
10'329 CHF/m²
median of signed sales · range 9'482 – 10'909 (Sud du canton region)
Price per m² · house
12'310 CHF/m²
median of signed sales · excluding land (10 sales)
Median sale price · 12 months
0.73 M CHF
all property types · 107 actual sales
Actual sales · 24 months
148
median 0.97 M · Q1–Q3 0.60 – 1.72 M
Official register
The latest actual sales in Onex
Every property transaction in the canton is published in the official gazette (FAO). Here are the latest sales recorded in Onex. The price shown is the one actually paid at the notary's, not the one displayed in the listing.
| Date | Type | Price paid | Official notice |
|---|---|---|---|
| 06.07.2026 · 2 months ago | Purchase | CHF 3'600'000 | 2026/7704 ↗ |
| 30.06.2026 · 2 months ago | Purchase | CHF 2'190'000 | 2026/7279 ↗ |
| 27.05.2026 · 4 months ago | Purchase | CHF 485'000 | 2026/5502 ↗ |
| 18.05.2026 · 4 months ago | Purchase | CHF 2'800'000 | 2026/5167 ↗ |
| 13.05.2026 · 4 months ago | Purchase | CHF 1'650'000 | 2026/5033 ↗ |
| 05.05.2026 · 4 months ago | Purchase | CHF 1'290'000 | 2026/4725 ↗ |
148 sales published between 18.04.2024 and 28.07.2026 · anonymous data (date, price, notice reference), nLPD-compliant · source: fao.ge.ch
Rentals
Rents in Onex in 2025
Average monthly rents for free-market homes, excluding charges, according to the official survey of May 2025.
| 2 rooms | 3 rooms | 4 rooms | 5 rooms | 6 rooms |
|---|---|---|---|---|
| 858 CHF | 1'161 CHF | 1'344 CHF | 1'632 CHF | 1'916 CHF |
OCSTAT, cantonal rent statistics (May 2025), rooms in the Geneva sense (kitchen counted). A rental yield to calculate? Our advisors will work it out with you.
Method
Why these figures differ from the portals'
Two ways of measuring a market coexist: recorded prices (what was signed at the notary's) and estimated prices (what a statistical model calculates). This page uses the former.
This page
Recorded prices
- Sales signed at the notary's and published in the official register (FAO) : 148 in Onex over 24 months
- Official ranges by quartiles (OCSTAT, 2024 vintage)
- Regional history published by OCSTAT, every figure verifiable at the source
Online portals
Estimated prices
- Statistical models (known as “hedonic”): an instant order of magnitude
- Smoothed averages, short history, unpublished methodology
- Useful to get your bearings; insufficient to set an asking price
A model estimates, the register records. Both are useful: we start from the recorded, then an advisor refines according to your property.
Taxation
Selling in Onex: what the tax says
Property gains tax (IBGI). In Geneva, the gain realised on a sale is taxed from 50% (held less than 2 years) down to 2% (25 years and more, scale in force since 2025). The holding period is often the first lever for optimising the timing of a sale. We calculate it with you before any marketing.
The sale also entails notary fees and possible mortgage exit penalties: a full costing avoids unpleasant surprises on the net seller proceeds.
Calculate your tax before selling
Official Geneva scale (LCP art. 84). Instant calculation, nothing is transmitted.
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How much is your property worth, precisely?
The figures on this page give the market. Your floor, your view, your state of repair do the rest. The free online valuation takes a few seconds, with no commitment; an advisor then refines it with the sales signed in your area.
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Frequently asked questions
FAQ — real estate in Onex
What is the price per m² in Onex in 2026?
The median price of an apartment is 10'329 CHF/m², with a range of 9'482 to 10'909 CHF/m² (signed sales, Sud du canton regional level (OCSTAT)). Over the past 12 months, properties sold in Onex (all types) changed hands at a median of CHF 735'000, according to the FAO register sales.
How many properties sell in Onex each year?
Around 74 sales per year: 148 transactions published in the FAO over the past 24 months, all categories combined.
How much is a house worth in Onex?
Over the past 24 months, the villas actually sold in Onex (15 sales, FAO register) show a median of CHF 2'000'000.
What is the price per m² of land in Onex?
Across land-plot sales of the past 24 months (46 transactions with surface area, FAO register), the price paid per plot works out at a median of 3'014 CHF/m² of land in Onex. An indicative figure: it includes any existing buildings on the plot. No official statistics exist at this level; it is a Nessell calculation on signed prices.
What tax do you pay when selling in Onex?
The Geneva IBGI, degressive with the holding period: 50% of the gain before 2 years, 2% from 25 years (2025 scale; full exemption has been abolished). The rate is cantonal, identical in every commune. We check the calculation with you before any sale.
Is the housing market tight in Onex?
Yes. Onex has 19'141 inhabitants (2025, OCSTAT) for only 33 vacant homes recorded as of 1 December 2025. Demand absorbs the roughly 74 sales concluded each year: a structurally tight market, favourable to sellers.
Is it the right time to sell in Onex?
The market lends itself to it: prices are holding at a high level (10'329 CHF/m² median) and demand remains liquid (~74 sales per year). The right moment depends above all on your situation: holding period (IBGI), next project, works to amortise. That is what the valuation helps you decide.
I inherited a property in Onex: what should I know?
An inheritance requires a documented valuation: for the declaration, the division between heirs and anticipating the tax in the event of a resale. Nessell provides a written appraisal based on comparable sales in Onex, and coordinates with your notary if needed.
How can I estimate the value of my property in Onex?
The medians on this page describe the market as a whole; the value of a specific property depends on its address, condition, floor and annexes. For an individual figure, have your property in Onex valued: free of charge, with no obligation, based on comparable signed sales.
The market in the neighbouring communes
SOURCES: land register — FAO Geneva (fao.ge.ch), harvested 2026-08-10 · OCSTAT (statistique.ge.ch). Every figure on this page can be verified at the source.