Clay shrink-swell
Low exposurelevel 1 out of 3
Clay soil swells when wet and shrinks when it dries. These movements crack houses with shallow foundations, especially after a drought.
For a property: At this level, no soil survey is required by law.
Median price per m²
€1,343/m²
32 sales over ten years
Sales in 2025
1
flats and houses
Population
104
0.0% since 2012
Public data cross-referenced (DGFiP, INSEE, ADEME), recorded on October 3, 2026.
The municipality has 104 inhabitants, a change of 0.0%.
Prices and sales
Number of sales per year in Montjay
1 sales recorded in 2025. The peak of the period remains 2021, with 8 sales.
View the data
| Year | Sales | Median price per m² | Total sales value |
|---|---|---|---|
| 2016 | 2 | — | €318,600 |
| 2018 | 1 | — | €78,000 |
| 2019 | 4 | — | €612,283 |
| 2020 | 1 | — | €270,350 |
| 2021 | 8 | €1,349/m² | €833,817 |
| 2022 | 3 | — | €591,820 |
| 2023 | 1 | — | €130,000 |
| 2024 | 3 | — | €302,000 |
| 2025 | 1 | — | €265,000 |
Source: DVF (DGFiP), land value request data · recorded on October 3, 2026
| Median price per m² over ten years | €1,343/m² |
|---|---|
| Sales in 2025 | 1 |
| Average of the previous five years | 3 |
| Total sales value in 2025 | €265,000 |
| Sales recorded over ten years | 32 |
Too few sales for an annual price. With 1 sales in 2025, a median price would describe a handful of properties, not a market: it is only published from five sales in the year.
How to read these figures. The median price splits the market in two: half of sales were made below it, half above. It withstands the few extreme sales that distort a small commune better than the average does.
The data come from DVF, the file of sales actually recorded by notaries, not from advertised prices, which are asking prices rather than agreed ones. Only sales of a flat or a house with a known floor area are counted. DVF does not cover Alsace-Moselle, which is governed by the land register (livre foncier).
Source: DVF (DGFiP) · recorded on October 3, 2026
Rents
Reference rents (2025)
| Property type | Median rent (€/m²) | Range (€/m²) |
|---|---|---|
| Flats, all sizes | 8.6 | 6.7 – 11.1 |
| Flats with 1-2 rooms | 12.3 | 9.8 – 15.4 |
| Flats with 3 or more rooms | 8.6 | 6.2 – 11.9 |
| Houses | 7.7 | 5.8 – 10.2 |
How to read this table. This is a predicted advertised rent, including service charges, per square metre per month — not the rent signed in the lease. The range brackets the estimate: most listings in the municipality fall within it. These estimates are recalculated every year with a new model, so two releases cannot be compared with each other.
Estimations ANIL, à partir des données du Groupe SeLoger et de leboncoin · Rent map 2025
Energy performance of the housing stock
Breakdown of homes in Montjay by energy performance certificate (EPC) band. Since the loi Climat & Résilience (Climate and Resilience Act), it is this band that determines whether a home may be let.
Breakdown of energy performance certificates in Montjay
D
E
F
G
- A13.3%
- B00.0%
- C26.7%
- D516.7%
- E826.7%
- F310.0%
- G1136.7%
30 homes surveyed. 46.7% of the surveyed housing stock is rated F or G — that is 14 homes already affected, or about to be, by the letting ban. Including band E, targeted for 2034, the share rises to 73.3%.
Rental ban timeline
- 2025Gbanned
- 2028Fbanned
- 2034Ebanned
2021 loi Climat & Résilience (Climate and Resilience Act) — applies to new leases.
Source: ADEME, energy performance certificate database · recorded on October 3, 2026
Why this breakdown matters. A dwelling rated G can no longer be let under a new lease since 1st January 2025; F will follow in 2028 and E in 2034. A commune whose stock is largely rated F or G therefore faces a wall of renovation work, or an exit from the rental market.
Note: these figures cover surveyed homes, not the entire stock. A survey is only required on sale or letting, so homes occupied for a long time are under-represented.
Housing stock
Montjay has 148 dwellings at the 2023 census, of which 39.0% are main residences; the rest is split between second homes and vacant dwellings.
What are dwellings used for?
- Main residences36.4%
- Second homes and occasional dwellings54.3%
- Vacant dwellings9.3%
Source: INSEE, census
Who lives in main residences?
- Tenants1817.4%
- Owner-occupiers8682.6%
Source: INSEE, census
Between 2012 and 2023, the housing stock grew by +7.0% while the population changed by 0.0%: homes are being built faster than the commune gains residents, a sign of smaller households, second homes or rising vacancy.
| Dwellings (2023) | 148 |
|---|---|
| Households | 58 |
| Montjay | Hautes-Alpes | Provence-Alpes-Côte d'Azur | France | |
|---|---|---|---|---|
| Main residences2023 | 36.4%−46.0 pts vs France | 49.3% | 75.5% | 82.4% |
| Second homes2023 | 54.3%+44.5 pts vs France | 45.2% | 17.5% | 9.8% |
| Vacant dwellings2023 | 9.3%+1.5 pt vs France | 5.5% | 7.1% | 7.8% |
| Residents who own their home | 82.6%+21.8 pts vs France | 64.5% | 56.0% | 60.8% |
| Tenant residents | 17.4%−20.0 pts vs France | 32.1% | 41.3% | 37.4% |
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.
Dwellings authorised for construction in Montjay
View the data
| Year | Flats (multi-dwelling buildings) | Detached houses | Total |
|---|---|---|---|
| 2021 | 0 | 0 | 0 |
| 2022 | 0 | 2 | 2 |
| 2023 | 0 | 0 | 0 |
| 2024 | 0 | 0 | 0 |
| 2025 | 0 | 1 | 1 |
| 2026* | 0 | 0 | 0 |
Source: Sit@del, ministry responsible for housing · recorded on October 3, 2026
Sources: INSEE (census), Sit@del · recorded on October 3, 2026
Population and households
| Population | 104 |
|---|---|
| Households | 58 |
| People per household | 1.80 |
Change in the population of Montjay
809010019681982199920122023104 inhab.
Between 2012 and 2023, the population changed by 0.0%.
Source: INSEE, population census · recorded on October 3, 2026
Age breakdown
- Under 181110.7%
- 18 to 2411.0%
- 25 to 2932.9%
- 30 and over8885.4%
Source: INSEE
What do people aged 15 and over do?
- Employed workers3234.4%
- Unemployed44.3%
- Retired people4750.5%
- Other economically inactive1010.8%
Source: INSEE
| Montjay | Hautes-Alpes | Provence-Alpes-Côte d'Azur | France | |
|---|---|---|---|---|
| Population trend2012-2023 | 0.0%−4.4 pts vs France | +2.8% | +5.7% | +4.4% |
| Median age2023 | 59.1 years+16.6 yrs vs France | 48.0 years | 44.9 years | 42.5 years |
| Share aged under 252023 | 12.5%−16.3 pts vs France | 24.0% | 26.8% | 28.8% |
| Share aged 65 and over2023 | 40.4%+19.1 pts vs France | 26.4% | 24.0% | 21.3% |
| People per household2023 | 1.8−17% vs France | 2.0 | 2.1 | 2.2 |
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.
Why the number of people per household matters. A household is everyone who shares the same dwelling. The fewer people it has, the more demand shifts towards small homes — studios and one-bedroom flats, sought by people living alone, students and retirees; the more it has, the more demand shifts towards family homes with three or more rooms.
In Montjay, a household has 1.80 people on average, compared with 2.17 in France: more people living alone and couples without children, so demand leans more towards small units.
Source: INSEE, population census · recorded on October 3, 2026
Income and employment
| Montjay | Hautes-Alpes | Provence-Alpes-Côte d'Azur | France | |
|---|---|---|---|---|
| Unemployment rate (aged 15-64)2023 | 11.4%≈ France | 8.7% | 11.6% | 11.0% |
| Activity rate (aged 15-64)2023 | 68.6%−7.1 pts vs France | 77.4% | 74.0% | 75.7% |
| Share of retired people (aged 15 and over)2023 | 50.5%+22.4 pts vs France | 34.4% | 30.0% | 28.1% |
| Share of pupils and students (aged 15 and over)2023 | 0.0%−7.6 pts vs France | 5.1% | 6.9% | 7.6% |
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.
How to read these figures. The standard of living is a household's disposable income (salaries, pensions and benefits, after tax) divided by its number of consumption units: the first adult counts as 1, other people aged 14 or over as 0.5, and each child as 0.3. It allows a single person and a family to be compared.
The poverty rate is the share of residents whose standard of living is below 60% of the national median. INSEE does not publish it for small communes, for reasons of statistical confidentiality: its absence is not a zero.
The unemployment rate here is the census one: people who declare themselves without work and looking for it, among the economically active aged 15 to 64. It is higher than INSEE's quarterly rate, which follows a stricter international definition.
Sources: INSEE (census, Filosofi) · recorded on October 3, 2026
Economic fabric
Number of businesses located in Montjay
51020142016201820202022202412
12 businesses in 2024, compared with 3 in 2014: +300.0% over the period.
View the data
| Year | Businesses |
|---|---|
| 2014 | 3 |
| 2015 | 5 |
| 2016 | 4 |
| 2017 | 5 |
| 2018 | 4 |
| 2019 | 8 |
| 2020 | 10 |
| 2021 | 9 |
| 2022 | 11 |
| 2023 | 11 |
| 2024 | 12 |
Source: INSEE, business demography information system · recorded on October 3, 2026
| Montjay | Hautes-Alpes | Provence-Alpes-Côte d'Azur | France | |
|---|---|---|---|---|
| Number of businesses2024 | 12 | 21,810 | 656,321 | 6,437,729 |
| Change in the number of businesses2019-2024 | +50.0%+25.0 pts vs France | +18.1% | +26.7% | +25.0% |
| Businesses per 1,000 inhabitants2024 | 115.4+19% vs France | 152.0 | 125.8 | 97.3 |
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?
- Sole traders1864.3%
- SAS and SASU414.3%
- SARL and EURL13.6%
- Civil companies, including SCI517.9%
Sources: INSEE (SIRENE register), INPI (national business register) · recorded on October 3, 2026
Registrations and insolvency proceedings
* current year, incomplete
From 2021 to 2025, 55 registrations for 13 insolvency proceedings.
View the data
| Year | Registrations | Insolvency proceedings |
|---|---|---|
| 2021 | 16 | 1 |
| 2022 | 12 | 2 |
| 2023 | 10 | 6 |
| 2024 | 12 | 0 |
| 2025 | 5 | 4 |
| 2026* | 12 | 3 |
Source: BODACC, official bulletin of civil and commercial announcements · recorded on October 3, 2026
Sources: INSEE, BODACC · recorded on October 3, 2026
Local taxation
In 2024, the overall property tax rate on built properties is 39.75% in Montjay.
| Rate voted by the commune | 35.41% |
|---|---|
| Intercommunal body, syndicates and special taxes | 4.34% |
| Overall rate on built properties (total) | 39.75% |
| Household waste collection tax (TEOM) | 13.50% |
| Overall rate on undeveloped land | 140.46% |
Worked example
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 Montjay, its property tax (taxe foncière) is €1,500 × 39.75% = €596 a year.
On top of this comes the household waste collection tax (TEOM), calculated on the same base: €1,500 × 13.50% = €203. 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 | 35.41% | 39.36% | 13.50% |
| 2022 | 35.41% | 39.81% | 13.50% |
| 2023 | 35.41% | 39.76% | 13.50% |
| 2024 | 35.41% | 39.75% | 13.50% |
Between 2021 and 2024, the overall rate changed by +0.39 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 3, 2026
Living environment
Public transport
1 public transport stops are located in the municipality, or 9.6 stops per 1,000 inhabitants.
Public transport stops in Montjay
- Stops1
Outline of the commune, north at the top.
Source: transport.data.gouv.fr, scheduled timetables of networks · recorded on October 3, 2026
Stops by network
- Réseau scolaire interurbain ZOU !1
Fixed internet
- Dwellings and premises connectable to fibre97.7%171 connectable out of 175
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
Natural and technological risks
The risks identified by the State in the territory of Montjay, what they mean, and what they change for a property.
Seismicity
Lowlevel 2 out of 5
France is divided into five seismicity zones, from 1 (very low) to 5 (high, in the Antilles).
For a property: In this zone, no seismic rules apply to detached houses.
Radon potential
Low potentiallevel 1 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, no particular information is required when selling or letting.
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 3, 2026