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Siamaggiore: what to know before buying a home

A municipality in the province of Oristano, Sardegna. Official data on earthquakes, population, services and transport.

Liveability index free for any address

Search for an address in Siamaggiore

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: Via Roma 0, Siamaggiore.

Siamaggiore, on the Tirso plain next to Oristano

The alluvial plain of the Tirso, just before the river reaches the Gulf of Oristano, is a land of irrigated fields and villages only a few metres above sea level. Siamaggiore is one of them, close to the provincial capital, so for many residents Oristano is where they work, go to school and do their daily shopping.

The village has a core of low courtyard houses typical of the Campidano, some with walls of unfired mud brick, and newer residential areas with detached homes. If you are buying an old house, have damp and walls checked by a surveyor who knows these materials; in newer houses, insulation and protection from summer heat count. The climate is zone C, with mild winters.

In 2023 there were 866 residents, down 10.7% since 2011, when there were 970. The average age is 50.7, against 49.8 in the province, over-65s are 31.1% and foreign residents 1.5%. Average declared income is a little below the provincial figure.

Earthquake risk is the lowest possible: all 87 municipalities in the province of Oristano are in seismic zone 4, with an expected ground acceleration here of about 0.050 g.

The issue that really matters is water. On a low plain near the river, flood hazard can change from one street to the next, and the report reads it from the official maps for the exact address, together with the ground elevation. Revenue Agency cadastral maps are published, so the land parcel can be found from the address.

Key points

  • Tirso plain, next to Oristano.
  • All 87 municipalities in the province in seismic zone 4.
  • 866 residents, down 10.7% since 2011.
  • Flood hazard to be checked address by address.

Overview

Siamaggiore is a municipality in the province of Oristano, in Sardegna. At the end of 2023 it had 866 residents, ranked 42 of 87 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, Siamaggiore is in seismic zone 4, the lowest-risk zone, where strong earthquakes are very rare. All 87 municipalities in the province are in the same zone.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.050 g, a moderate value: the level with a 10% probability of being exceeded in 50 years, on rock.

In zone 4 the risk is low, but for an older building it is still worth asking about the state of the structure.

Population

Compared with the 2011 census, the resident population has fallen by 10.7%. The estimated average age is 51 years, in line with the province. 31% of residents are over 65 (the regional figure is 27%). Foreign residents make up 1.5% of the population. On average, a household has 2.2 members.

Income and climate

In tax year 2024, taxpayers in Siamaggiore declared an average taxable income of 18,620 euros, below the provincial average (19,764 euros). The Italian average is 24,895 euros.

Siamaggiore is in climate zone C, with 1,058 heating degree days: heating may be switched on from 15 November to 31 March, for up to 10 hours a day. The same table puts the town hall at 8 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Siamaggiore has 1 pharmacy.

The data shows no schools within the municipality, against a provincial average of 1.2 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 8.9% of the land in Siamaggiore, compared with 3.4% in the region. In 2024 built-up land grew by 2.9 hectares.

Radon and contaminated sites

Siamaggiore is not among the radon priority areas designated by the Regione Sardegna in 2022. Radon varies from building to building and can only be known by measuring it, especially on ground floors and in basements.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Siamaggiore: 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 Siamaggiore 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 12 inhabited census areas in Siamaggiore. Half of the residents live in areas scoring 67 or more.

Residents by band

  • fair 24.4%
  • good 75.6%

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 115063. The text on this page is generated automatically from the data.