Isola del Giglio: what to know before buying a home
A municipality in the province of Grosseto, Toscana. Official data on earthquakes, population, services and transport.
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Search for an address in Isola del Giglio
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 di Mezzo Franco 1, Isola del Giglio.
Isola del Giglio: the Port, the Castle and Campese
The municipality is a whole island, plus the island of Giannutri. Giglio lies in the Tuscan Archipelago, opposite the Argentario promontory, and is reached by ferry from Porto Santo Stefano in about an hour. There are three settlements: Giglio Porto, where the boats come in, Giglio Castello, the walled village up on the hill where the town hall is, and Giglio Campese, on the beach on the western side.
For a buyer, island life changes the sums. Materials, builders and removals all come by sea, so a renovation takes more time and organisation than on the mainland. Many houses are lived in mainly in summer, and in winter fewer services stay open. Part of the island lies within the Tuscan Archipelago National Park, so check the planning restrictions before designing an extension or a new building.
There were 1,294 permanent residents in 2023, down 8.7% on 2011. The average age is high, 53.0 against 49.1 in the province of Grosseto, and over-65s are 35.5% (29.0% in the province). Foreign residents are 11.4%. Declared incomes are in line with the provincial average.
Earthquakes are a small concern: Giglio is in seismic zone 4, the lowest in the Civil Protection classification, along with 9 other municipalities in the province, and the expected ground acceleration is 0.034 g. In stone houses, what matters most is the roof, damp and the systems, which wear faster in sea air.
The Revenue Agency (Agenzia delle Entrate) cadastral maps are published for the island too: the report traces the land parcel from the address, checks landslide and flood hazard on the official maps and measures the distance from the house to the pharmacy, school and shops.
Key points
- Three settlements: Giglio Porto, Giglio Castello and Giglio Campese.
- Ferry from Porto Santo Stefano, about an hour's crossing.
- Average age 53.0, over-65s at 35.5%.
- Seismic zone 4, expected acceleration 0.034 g.
Overview
Isola del Giglio is a municipality in the province of Grosseto, in Toscana. At the end of 2023 it had 1,294 residents, ranked 22 of 28 municipalities in the province.
Earthquakes
For Italy's Civil Protection Department, Isola del Giglio is in seismic zone 4, the lowest-risk zone, where strong earthquakes are very rare. Only 10 of 28 municipalities in the province are in zone 4.
In the built-up area, the expected ground shaking (peak ground acceleration, PGA) is about 0.034 g, a low 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 8.7%. The estimated average age is 53 years, higher than the province average (49). 36% of residents are over 65 (the regional figure is 26%). Foreign residents make up 11.4% of the population. On average, a household has 1.7 members.
Income and climate
In tax year 2024, taxpayers in Isola del Giglio declared an average taxable income of 22,911 euros, in line with the province (22,706 euros). The Italian average is 24,895 euros.
Isola del Giglio is in climate zone D, with 2,084 heating degree days: heating may be switched on from 1 November to 15 April, for up to 12 hours a day. The same table puts the town hall at 405 metres above sea level.
Services
In the official Ministry of Education and Ministry of Health lists, Isola del Giglio has 3 schools and 2 pharmacies. The Overture Maps data also lists 7 sports facilities and 2 parks and green areas.
The data shows no grocery shops and supermarkets within the municipality, against a provincial average of 0.7 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 3.7% of the land in Isola del Giglio, compared with 3.2% in the province and 6.2% in the region. In 2024 built-up land stayed almost the same.
Radon and contaminated sites
Isola del Giglio is one of the municipalities designated as a radon priority area by the Regione Toscana in 2025. According to the ISPRA map, the estimated radon emission in the municipality is medium. Radon varies from building to building and can only be known by measuring it, especially on ground floors and in basements.
Official databases list one contaminated site, or site still under investigation, in Isola del Giglio. The report tells you whether one is close to the address.
Landslides and flooding
Landslide and flood hazard changes from one street to the next even within Isola del Giglio: 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 Isola del Giglio 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 17 inhabited census areas in Isola del Giglio. Half of the residents live in areas scoring 68 or more.
Residents by band
- fair 6.0%
- good 94.0%
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
- Seismic classification of municipalities, Dipartimento della Protezione Civile. Licence CC BY 4.0, updated to 2025-05.
- MPS04 seismic hazard model, INGV. Licence CC BY 4.0, 2004 model.
- Data by census section, Istat. Licence CC BY 4.0, residents at the end of 2023, compared with the 2011 census.
- Places, Overture Maps Foundation. Licence CDLA Permissive 2.0 and others depending on provider, release 2026-10-21.0.
- Income and main IRPEF variables by municipality, MEF, Dipartimento delle Finanze. Licence CC BY 3.0 IT, tax year 2024.
- Climate zones and heating degree days of municipalities (Presidential Decree 412/1993, Annex A), Normattiva. Licence CC BY 4.0, current text.
- Land take, territorial dynamics and ecosystem services, ISPRA e SNPA. Licence CC BY 4.0, 2024 data.
- Predictive radon map by municipality, ISPRA. Licence CC BY 4.0, version 2022-11.
- Radon priority areas (Legislative Decree 101/2020), Regione Toscana, national list compiled by ARPA Lombardia. Licence Atto pubblico (art. 5 L. 633/1941), 2025.
- Contaminated sites, ISPRA, MOSAICO - Banca dati nazionale dei siti oggetto di procedimento di bonifica. Licence CC BY 4.0, updated to 12 November 2026.
- Liveability index by census area, Vicinalia, from the data in the report sections. Licence CC BY-SA 4.0, worked out on 30 September 2026.
- List of Italian municipalities, Istat. Licence CC BY 4.0, updated to 21 February 2026.
ISTAT code 053012. The text on this page is generated automatically from the data.