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Custonaci: what to know before buying a home

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

Liveability index free for any address

Search for an address in Custonaci

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 Assieni 1, Custonaci.

Custonaci, marble quarries and the bay of Cornino

Custonaci's name is tied to stone. The hills around the town are cut by the quarries of a marble basin that produces perlato di Sicilia, a pale marble exported to many countries, and the cut rock faces are as much part of the landscape as the olive groves. The town lies below 200 metres, between Erice and San Vito Lo Capo, with Trapani about half an hour away by road, and its main streets gather around the sanctuary of Maria Santissima di Custonaci.

The municipality runs down to the sea at the hamlet of Cornino and includes part of the Monte Cofano nature reserve, the headland that closes the bay. At Christmas the caves of Scurati, the Mangiapane cave in particular, host a well-attended living nativity scene. There are two markets for buyers: on the coast most homes are summer properties, while inland they belong to people who live here all year. Near the quarries, ask about dust, noise and heavy lorries, which vary a great deal from one road to the next.

In 2023 there were 5,258 residents, 2.5% fewer than in 2011. The average age is 45.3, against 46.0 for the province of Trapani, and over-65s make up 23.2%. Foreign residents account for 4.2% and average declared incomes are below the provincial level. The data count 40 bars and restaurants, 7.61 per 1,000 residents against 5.45 in the province.

Custonaci is in seismic zone 2 of the national classification set by the Civil Protection Department, like 17 other municipalities in the province, while 6 are in zone 1. The expected ground acceleration in the built-up area is about 0.059 g. In stone houses and in buildings extended in several stages, a structural check is worthwhile, starting with how the walls are tied to the floors.

Below the slopes of Monte Cofano and the limestone hills, the report checks the official landslide and rockfall maps for the address. Cadastral maps from the Revenue Agency (Agenzia delle Entrate) are published, so the report can go from the address to the plot.

Key points

  • Marble basin of perlato di Sicilia, between Erice and San Vito Lo Capo.
  • 7.61 bars and restaurants per 1,000 residents.
  • Seismic zone 2, expected acceleration about 0.059 g.
  • Summer homes on the coast, year-round homes inland.

Overview

Custonaci is a municipality in the province of Trapani, in Sicilia. At the end of 2023 it had 5,258 residents, ranked 17 of 25 municipalities in the province.

Earthquakes

For Italy's Civil Protection Department, Custonaci is in seismic zone 2, a zone where strong earthquakes are possible. Most municipalities in the province (18 of 25) are in the same zone.

In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.059 g, a moderate value: the level with a 10% probability of being exceeded in 50 years, on rock.

For anyone buying in Custonaci, the building matters a great deal: ask for the design year, whether it met the 2008 seismic standards, and whether any seismic retrofit has been carried out.

Population

Compared with the 2011 census, the resident population has fallen by 2.5%. The estimated average age is 45 years, in line with the province. 23% of residents are over 65 (the regional figure is 23%). Foreign residents make up 4.2% of the population. On average, a household has 2.2 members.

Income and climate

In tax year 2024, taxpayers in Custonaci declared an average taxable income of 17,313 euros, below the provincial average (18,927 euros). The Italian average is 24,895 euros.

Custonaci is in climate zone C, with 1,015 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 186 metres above sea level.

Services

In the official Ministry of Education and Ministry of Health lists, Custonaci has 4 schools and 2 pharmacies. The Overture Maps data also lists 6 grocery shops and supermarkets, 3 healthcare facilities, 4 sports facilities and 4 parks and green areas.

There are 1.1 grocery shops and supermarkets per 1,000 residents, more than the province average (0.7).

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 9.2% of the land in Custonaci, compared with 7.9% in the province and 6.6% in the region. In 2024 built-up land grew by 1.7 hectares.

Radon and contaminated sites

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 Custonaci.

Landslides and flooding

Landslide and flood hazard changes from one street to the next even within Custonaci: 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 Custonaci 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 57 inhabited census areas in Custonaci. Half of the residents live in areas scoring 74 or more.

Residents by band

  • fair 4.0%
  • good 56.5%
  • very good 39.5%

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 081007. The text on this page is generated automatically from the data.