Municipality profile · department 976
The municipality has 15,848 inhabitants.
Public data cross-referenced (DGFiP, INSEE), recorded on October 4, 2026.
| Private dwellings vacant for more than two years (2025) | 178 |
|---|---|
| Share of private housing stock | 25.4% |
Why vacancy of more than two years. A dwelling that stands empty for a few months is waiting for a buyer, a tenant or the end of building work: that is the normal breathing of the market. Empty for more than two years, it has left the market — a run-down property, a blocked inheritance, an owner who will neither let nor sell. We do not publish total vacancy from the same file: its national level varies by a third from one year to the next without the housing stock having changed, which rules out any comparison.
Source: LOVAC (Cerema, DGFiP), vacant dwellings in the private housing stock · recorded on October 4, 2026
Dwellings authorised for construction in Dembeni
| Year | Flats (multi-dwelling buildings) | Detached houses | Total |
|---|---|---|---|
| 2021 | 207 | 39 | 246 |
| 2022 | 22 | 49 | 71 |
| 2023 | 58 | 40 | 98 |
| 2024 | 45 | 29 | 74 |
| 2025 | 317 | 41 | 358 |
| 2026* | 20 | 13 | 33 |
Source: Sit@del, ministry responsible for housing · recorded on October 4, 2026
Sources: INSEE (census), Sit@del · recorded on October 4, 2026
| Population | 15,848 |
|---|
Source: INSEE, population census · recorded on October 4, 2026
Number of businesses located in Dembeni
| Year | Businesses |
|---|---|
| 2014 | 0 |
| 2015 | 0 |
| 2016 | 0 |
| 2017 | 73 |
| 2018 | 81 |
| 2019 | 79 |
| 2020 | 73 |
| 2021 | 76 |
| 2022 | 72 |
| 2023 | 134 |
| 2024 | 181 |
Source: INSEE, business demography information system · recorded on October 4, 2026
| Dembeni | Mayotte | Mayotte | France | |
|---|---|---|---|---|
| Number of businesses2024 | 181 | 5,359 | — | 6,437,729 |
| Change in the number of businesses2019-2024 | +129.1%+104.1 pts vs France | +146.4% | — | +25.0% |
Under each value for the municipality: its gap with France. For a rate, the gap is in percentage points (12.4% vs 7.8% = +4.6 pts); for an amount or a ratio, as a percentage of the national value.
In what form do businesses operate?
Sources: INSEE (SIRENE register), INPI (national business register) · recorded on October 4, 2026
Registrations and insolvency proceedings
* current year, incomplete
From 2021 to 2025, 592 registrations for 19 insolvency proceedings.
| Year | Registrations | Insolvency proceedings |
|---|---|---|
| 2021 | 115 | 2 |
| 2022 | 107 | 3 |
| 2023 | 140 | 5 |
| 2024 | 96 | 5 |
| 2025 | 134 | 4 |
| 2026* | 134 | 1 |
Source: BODACC, official bulletin of civil and commercial announcements · recorded on October 4, 2026
Sources: INSEE, BODACC · recorded on October 4, 2026
In 2024, the overall property tax rate on built properties is 14.39% in Dembeni.
| Rate voted by the commune | 12.71% |
|---|---|
| Intercommunal body, syndicates and special taxes | 1.68% |
| Overall rate on built properties (total) | 14.39% |
| Household waste collection tax (TEOM) | 14.40% |
| Overall rate on undeveloped land | 6.68% |
A dwelling with a cadastral rental value of €3,000 has a tax base of €1,500: the law sets it at half the rental value. In Dembeni, its property tax (taxe foncière) is €1,500 × 14.39% = €216 a year.
On top of this comes the household waste collection tax (TEOM), calculated on the same base: €1,500 × 14.40% = €216. A landlord can recover it from their tenant; the property tax (taxe foncière), by contrast, remains payable by the owner.
These amounts are before the collection charges retained by the State. Your property's rental value is shown on your property tax (taxe foncière) notice.
| Year | Communal rate | Overall rate on built properties | Household waste |
|---|---|---|---|
| 2021 | 8.91% | 9.27% | 14.40% |
| 2022 | 8.91% | 9.86% | 14.40% |
| 2023 | 8.91% | 10.46% | 14.40% |
| 2024 | 12.71% | 14.39% | 14.40% |
Between 2021 and 2024, the overall rate changed by +5.12 point.
How to read these rates. Property tax (taxe foncière) is calculated by multiplying the property's tax base by the overall rate: this is the figure to compare between communes, not the communal rate alone. Since 2021, départements no longer collect property tax on buildings; their former share is included in the communal rate.
A high rate does not mean a high tax. The cadastral rental value is not the market rent: it is an administrative estimate based on 1970 rents, revalued each year by a national coefficient. In a town with old, low rental values, a 50% rate can cost less than a 25% rate elsewhere.
Source: DGFiP, local taxation for individuals (2024 scale) · recorded on October 4, 2026
| Establishments | 1 |
|---|---|
| Average exam pass rate | 65.0% |
| Average index of social position | 59.6 |
| Establishment | Type | Success rate | Social position |
|---|---|---|---|
| COLLEGE ZAKIA MADI | Collège (lower secondary school) | 65.0% | 59.6 |
How to read these figures. The pass rate is that of the brevet for a collège and of the baccalauréat for a lycée. The index of social position summarises pupils' social background: the national average is close to 100, and a higher index indicates more advantaged families. Nursery and primary schools are not covered.
Source: Ministry of National Education · recorded on October 4, 2026
Connectable means that optical fibre reaches the building or the street and a subscription can be taken out, not that the dwelling is already subscribed.
Source: ARCEP, fibre rollout · situation as at June 2026
Of the 60 passenger cars registered in the commune in 2024:
Why this share may look high. These are cars registered during the year, not all those on the road: electric vehicles weigh far more in recent purchases than in the overall fleet. Company and rental vehicles are also registered at the company's address, which inflates the share in communes that host head offices or rental firms.
Source: Ministry of Ecological Transition, passenger car registrations · recorded on October 4, 2026
The risks identified by the State in the territory of Dembeni, what they mean, and what they change for a property.
Significant potentiallevel 3 out of 3
Radon is a natural radioactive gas that rises from granitic and volcanic soils and can build up in poorly ventilated rooms, especially on ground floors and in basements.
For a property: At this level, the seller or landlord must inform the buyer or tenant. Good ventilation and a sealed ground floor are usually enough to reduce exposure.
3in the commune
The commune is covered by a prevention plan for: flooding, ground movement. This is a document issued by the prefect that delimits the exposed zones.
For a property: In the delimited zones, building or extending may be prohibited or subject to requirements. The plan does not necessarily cover the whole commune: only the risk statement provided before a sale or letting says whether the address is affected.
6in the commune
A classified installation is an activity that the law subjects to declaration or authorisation because it may cause nuisance: factory, warehouse, livestock farm, petrol station, waste recycling centre, boiler room.
For a property: Their number mainly reflects the commune's economic activity: most pose no danger to neighbours. What matters is their nature and their distance from the property.
Installations and cavities recorded in Dembeni
Outline of the commune, north at the top.
Source: Géorisques, Ministry of Ecological Transition · recorded on October 4, 2026
A prevention plan is not a bad sign in itself. It shows that the risk is mapped and regulated; it is its absence for a known hazard that should raise questions.
This page describes the commune, not an address. Before a sale or a letting, the seller or landlord must provide a risk statement drawn up for the property. You can obtain one free of charge for any address at georisques.gouv.fr.
Source: Géorisques, Ministry of Ecological Transition · recorded on October 4, 2026