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Saint-Denis: what to know before buying a home

A municipality in the province of Valle d'Aosta/Vallée d'Aoste, Valle d'Aosta/Vallée d'Aoste. Official data on earthquakes, population, services and transport.

Liveability index free for any address

Search for an address in Saint-Denis

The report looks at the exact point: landslide and flood risk, seismic zone, price per square metre for the area, services and nearby stops.

For example: Frazione Semon 1, Saint-Denis.

Saint-Denis, the sunny slope above Chambave and Cly castle

On the sunny side of the central Aosta Valley, above Chambave and Châtillon, Saint-Denis is a municipality of villages scattered from around 800 metres upwards, among meadows and woods. Within its boundaries stands Cly castle, one of the valley's medieval fortifications, on a knoll overlooking the valley floor.

For residents, daily life depends on the valley floor: Châtillon has the motorway exit, the railway station and the main services, and Aosta is about half an hour away. Village houses are stone and timber, with restored homes next to rural buildings waiting to be converted. Facing the sun helps with heating, but this is climate zone F and winters are still long.

Istat, the national statistics office, recorded 368 residents in 2023, 3.7% fewer than in 2011. The estimated average age is 46.1, slightly below the regional 47.0, and over-65s make up 22.0%, less than the regional 25.3%. Households average 2.06 people and declared incomes are below the Aosta Valley average.

The whole Aosta Valley is in the same seismic zone on the Civil Protection Department's scale: zone 3, for all 74 municipalities, with expected ground acceleration at Saint-Denis of about 0.073 g. On the slopes, landslides and debris flows weigh more and should be checked on the official maps for the exact address, and with a stone rural building it makes sense to strengthen walls and roof during the works.

Revenue Agency (Agenzia delle Entrate) cadastral maps are published and the report finds the land parcel.

Key points

  • Villages on the sunny slope above Chambave, with Cly castle.
  • 368 residents in 2023, average age 46.1.
  • Seismic zone 3, like all 74 municipalities in the region.
  • Valley floor close by: motorway and station at Châtillon.

Overview

Saint-Denis is a municipality in the province of Valle d'Aosta/Vallée d'Aoste, in Valle d'Aosta/Vallée d'Aoste. At the end of 2023 it had 368 residents, ranked 56 of 74 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, Saint-Denis is in seismic zone 3, a zone where strong earthquakes are possible but rare. All 74 municipalities in the province are in the same zone.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.073 g, a moderate value: the level with a 10% probability of being exceeded in 50 years, on rock.

Even in zone 3, seismic standards apply to new buildings: for an older building, ask about the design year and any structural work.

Population

Compared with the 2011 census, the resident population has fallen by 3.7%. The estimated average age is 46 years, in line with the province. 22% of residents are over 65 (the regional figure is 25%). Foreign residents make up 3.5% of the population. On average, a household has 2.1 members.

Income and climate

In tax year 2024, taxpayers in Saint-Denis declared an average taxable income of 23,612 euros, below the provincial average (26,152 euros). The Italian average is 24,895 euros.

Saint-Denis is in climate zone F, with 3,424 heating degree days, with no limits on when heating may be used. The same table puts the town hall at 809 metres above sea level.

Services

The data shows no schools within the municipality, against a provincial average of 1.7 per 1,000 residents.

Public transport

We do not yet have open public transport timetables for this municipality: the report says so explicitly, without inventing distances.

How built-up it is

Buildings, roads, car parks and other sealed surfaces cover 4.0% of the land in Saint-Denis, compared with 2.2% in the province and 2.2% in the region. In 2024 built-up land stayed almost the same.

Radon and contaminated sites

Saint-Denis is not among the radon priority areas designated by the Regione Valle d'Aosta in 2026. Radon varies from building to building and can only be known by measuring it, especially on ground floors and in basements.

Official databases list no open contaminated sites in Saint-Denis; one has been cleaned up or closed.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Saint-Denis: the report checks the address against the ISPRA maps.

House prices

The Revenue Agency's price ranges per square metre (OMI) apply to zones, not to whole municipalities: the report gives the range for the address's zone.

Land registry

The cadastral maps for Saint-Denis are public: from the address the report finds the sheet and parcel number.

Liveability area by area

The Vicinalia liveability index runs from 0 to 100 and looks at the place, not the people who live there: services within walking distance, transport, green space, natural hazards, air, quiet, buildings and connection. Here it is worked out at the centre of each of the 24 inhabited census areas in Saint-Denis. Half of the residents live in areas scoring 64 or more.

Residents by band

  • modest 8.1%
  • fair 42.0%
  • good 49.9%

Vicinalia index by census area, licence CC BY-SA 4.0. Data: IdroGEO ISPRA (2026), Istat, INGV, EEA, AGCOM, Overture Maps and OpenStreetMap.

The colour is the value at the centre of the area. For an exact address, search for it above: the free check looks at that exact point. How the index is worked out

Data sources

ISTAT code 007059. The text on this page is generated automatically from the data.