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Trequanda: what to know before buying a home

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

Liveability index free for any address

Search for an address in Trequanda

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 Ser Giovanni Piccolomini 1, Trequanda.

Trequanda, Castelmuzio and Petroio in the Siena hills

Three villages make up the municipality of Trequanda: the main one, at around 450 metres and gathered around its castle, plus Castelmuzio and Petroio, the latter with a long tradition of terracotta making. This is the hill country south-east of Siena, between the Crete Senesi, the Val d'Orcia and the Valdichiana, a landscape of olive groves, woods and wheat fields.

The market is typical of the Siena countryside: stone farmhouses, small farms with land and village houses, many turned into agriturismi (farm stays) or second homes. Country properties need checking for structure, roofs, services and access, which is sometimes an unpaved road. Sinalunga and Montepulciano are the nearby towns for services; Siena is further away. Declared incomes are below the provincial average.

In 2023 there were 1,155 residents, 13.7% fewer than in 2011 according to Istat, the national statistics office. The average age is 51.7 against 47.6 for the province of Siena, over-65s are 32.7% against 26.9%, and foreign residents 9.4%.

Trequanda is in seismic zone 3 of the Civil Protection classification, like 31 of the 35 municipalities in the province, with an expected ground acceleration in the village of 0.144 g. For an old farmhouse, ask whether work has been done on the walls and floors and under which permits, especially if the building has been converted.

The Revenue Agency (Agenzia delle Entrate) publishes cadastral maps for the municipality and the report traces the address to its land parcel. On the clay hills of the area, landslide hazard changes from one farm to the next, and the report checks it on the official maps.

Key points

  • Three villages: Trequanda, Castelmuzio and Petroio.
  • Farmhouses and estates, often farm stays or second homes.
  • Seismic zone 3, expected acceleration 0.144 g.
  • Over-65s at 32.7%, above the provincial 26.9%.

Overview

Trequanda is a municipality in the province of Siena, in Toscana. At the end of 2023 it had 1,155 residents, among the smallest in the province (33 of 35).

Earthquakes

For Italy's Civil Protection Department, Trequanda is in seismic zone 3, a zone where strong earthquakes are possible but rare. Most municipalities in the province (31 of 35) are in the same zone.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.144 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 13.7%. The estimated average age is 52 years, higher than the province average (48). 33% of residents are over 65 (the regional figure is 26%). Foreign residents make up 9.4% of the population. On average, a household has 2.1 members.

Income and climate

In tax year 2024, taxpayers in Trequanda declared an average taxable income of 22,861 euros, below the provincial average (25,404 euros). The Italian average is 24,895 euros.

Trequanda is in climate zone E, with 2,115 heating degree days: heating may be switched on from 15 October to 15 April, for up to 14 hours a day. The same table puts the town hall at 453 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Trequanda has 4 schools and 1 pharmacy. The Overture Maps data also lists 2 grocery shops and supermarkets, 1 healthcare facility and 1 green area.

There are 3.5 schools per 1,000 residents, more than the province average (0.9).

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 2.8% of the land in Trequanda, compared with 4.0% in the province and 6.2% in the region. In 2024 built-up land stayed almost the same.

Radon and contaminated sites

Trequanda is not among the radon priority areas designated by the Regione Toscana in 2025. According to the ISPRA map, the estimated radon emission in the municipality is low. 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 contaminated sites in Trequanda.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Trequanda: 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 Trequanda 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 28 inhabited census areas in Trequanda. Half of the residents live in areas scoring 71 or more.

Residents by band

  • fair 43.4%
  • good 56.6%

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 052036. The text on this page is generated automatically from the data.