The average price per m² in Onnion is 3 071 €/m² for an apartment, based on actual notarised (DVF) sales. About 14 transactions are recorded each year.
Atmospheric illustration of Onnion, a mountain village of the Vallée Verte in Haute-Savoie.
In Onnion, the benchmark price stands at 3 071 €/m² for an apartment. This level reflects a mountain market where the main residences of local families meet second homes tied to the proximity of the Brasses ski area. The village sits between the Faucigny and the Chablais, at around 800 metres of altitude, an Alpine setting that attracts both families settled year-round and buyers looking for a base for mountain weekends. These values come from DVF data, that is, transactions actually registered with notaries, not from listing estimates. They give an order of magnitude: each property still has to be assessed on its condition, altitude and aspect, criteria that count for even more in a mountain area.
Prices from the DVF file (Demandes de valeurs foncières, published by the DGFiP), transactions actually recorded at the notary at municipality level. Cross-referenced with the Notaires de France - INSEE indices. Learn more about our methodology.
The Onnion market is driven by the twin demand for main residences and for second homes tied to the Brasses ski area. This proximity to the slopes and the hiking trails supports steady demand for chalets and houses with a view, while the village centre keeps a more local clientele attached to village life. Transaction volume, limited by the size of the municipality, makes each sale sensitive to the specific features of the property, altitude, aspect and distance from the ski area, more than to any single market trend.
Over the longer term, the price trajectory depends on the appeal of the Brasses massif and, more broadly, on mountain tourism in Haute-Savoie. The scarcity of building land, constrained by the relief of the Vallée Verte, supports the value of well-located properties. Energy performance is also becoming a weighty criterion in a mountain area, where heating takes a larger share of an owner's budget: well-insulated properties hold their value, poorly insulated homes are discounted.
Onnion sits in the lower middle range of its mountain area: its prices stay close to those of Thyez, while falling below those of Mieussy and Taninges.
Onnion lies in the Vallée Verte, an area of the Chablais massif set between the Faucigny and the Chablais, south of Thonon-les-Bains. The village obtained the right to its own church in 1446, having until then been attached to the parish of Mieussy and its Saint-Gervais-et-Saint-Protais church. The present building, the Saint-Maurice church, was rebuilt between 1824 and 1829 on the site of the former church, to plans by the architect Albert Amoudruz.
Like many municipalities of the Vallée Verte, Onnion long lived from a farming and pastoral economy, paced by livestock and the use of the mountain pastures above the village. The territory, shared between the influences of the Faucigny and the Chablais, kept this rural character until the rise of mountain tourism in the 20th century, which gradually transformed part of the local economy without erasing the traditional farms and hamlets.
Since 1 January 2010, Onnion has belonged to the Communauté de communes des Quatre Rivières, alongside Mégevette, Saint-Jeoire and other neighbouring municipalities. The village is today one of the access points to the Brasses ski and hiking area, shared with Bogève, Saint-Jeoire and Viuz-en-Sallaz, which peaks at around 1 500 metres and enlivens village life in summer as in winter.
According to INSEE, Onnion has around 1 299 inhabitants. The market serves both families settled year-round, attached to village life between the Faucigny and the Chablais, and second-home buyers drawn by the proximity of the Brasses ski area and by the Alpine setting at around 800 metres of altitude. The housing stock therefore combines main residences and second homes, with a dominant share of detached houses, typical of the mountain villages of the Vallée Verte.
The benchmark price in Onnion stands at 3 071 €/m² for an apartment. This figure comes from DVF data, the sales actually signed before notaries. It is an average: depending on altitude, aspect and the condition of the property, a recent chalet or an older apartment in the village can differ noticeably from this base.
The village centre, around the Saint-Maurice church and the town hall, concentrates local shops and services. The hamlets and the areas close to the Brasses ski area particularly attract second-home buyers, won over by direct access to the slopes and the hiking trails. Properties with an open view over the Vallée Verte remain among the most sought after.
Onnion sits in the Vallée Verte, between the Faucigny and the Chablais, some twenty kilometres from Bonneville and Annemasse. The municipality is served by the roads climbing towards Saint-Jeoire and Viuz-en-Sallaz, and by access to the Brasses ski area. This mountain position, away from the main routes, is part of the setting buyers are looking for.
The local market remains dominated by the detached house and the chalet, suited to mountain life and to occasionally hosting family or friends. Apartments exist mainly in the village centre and in a few developments linked to mountain tourism, but stay in the minority. For a buyer, the choice depends mainly on the intended use, main residence or base for mountain stays.
The Vallée Verte remains marked by its relief and its mountain pastures, which strongly constrain what can be built on a plot. The altitude and aspect of a property directly affect how it can be used, notably for snow cover or winter access. Before any project, it is worth consulting the local planning document at the town hall to check whether a plot can be built on and which mountain-area rules apply.
This analysis is published by Immover, an independent observatory founded by Antony Barbier. Data sourced from official sources (DVF, INSEE, Notaries of France).