Municipality profile · department 78
In Saint-Illiers-la-Ville (78), the median property price stands at €2,095/m² across 44 recorded transactions (DVF).
Public data cross-referenced (DGFiP, INSEE, ADEME), recorded on October 3, 2026.
The municipality has 350 inhabitants, a change of -11.4% ; median living standard there reaches €30,810 a year.
Median price per m² over time in Saint-Illiers-la-Ville
Over 4 years, the median house price has changed by +10.8%.
| Year | Flat | House | Sales included |
|---|---|---|---|
| 2014 | — | — | 4 |
| 2016 | — | — | 1 |
| 2017 | — | — | 4 |
| 2018 | — | €2,095/m² | 5 |
| 2019 | — | €2,409/m² | 5 |
| 2020 | — | — | 3 |
| 2021 | — | €1,711/m² | 6 |
| 2022 | — | €2,322/m² | 6 |
| 2023 | — | — | 2 |
| 2024 | — | — | 2 |
| 2025 | — | — | 1 |
Source: DVF (DGFiP), land value request data · recorded on October 3, 2026
Number of sales per year in Saint-Illiers-la-Ville
1 sales recorded in 2025. The peak of the period remains 2022, with 7 sales.
| Year | Sales | Median price per m² | Total sales value |
|---|---|---|---|
| 2016 | 1 | — | €342,900 |
| 2017 | 4 | — | €1.2M |
| 2018 | 5 | €2,095/m² | €1.1M |
| 2019 | 5 | €2,409/m² | €1.9M |
| 2020 | 3 | — | €1.2M |
| 2021 | 6 | €1,949/m² | €1.6M |
| 2022 | 7 | €2,674/m² | €1.8M |
| 2023 | 2 | — | €461,000 |
| 2024 | 2 | — | €515,000 |
| 2025 | 1 | — | €235,000 |
Source: DVF (DGFiP), land value request data · recorded on October 3, 2026
| Median price per m² over ten years | €2,095/m² |
|---|---|
| Sales in 2025 | 1 |
| Average of the previous five years | 4 |
| Total sales value in 2025 | €235,000 |
| Sales recorded over ten years | 44 |
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
| Property type | Median rent (€/m²) | Range (€/m²) |
|---|---|---|
| Flats, all sizes | 14.6 | 12.5 – 17.0 |
| Flats with 1-2 rooms | 17.7 | 15.4 – 20.3 |
| Flats with 3 or more rooms | 12.1 | 10.4 – 14.1 |
| Houses | 11.8 | 9.6 – 14.6 |
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
Breakdown of homes in Saint-Illiers-la-Ville 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 Saint-Illiers-la-Ville
64 homes surveyed. 14.1% of the surveyed housing stock is rated F or G — that is 9 homes already affected, or about to be, by the letting ban. Including band E, targeted for 2034, the share rises to 32.8%.
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.
Saint-Illiers-la-Ville has 315 dwellings at the 2023 census, of which 43.2% are main residences; the rest is split between second homes and vacant dwellings.
What are dwellings used for?
Source: INSEE, census
Who lives in main residences?
Source: INSEE, census
Between 2012 and 2023, the housing stock grew by +21.1% while the population changed by +2.9%: homes are being built faster than the commune gains residents, a sign of smaller households, second homes or rising vacancy.
| Dwellings (2023) | 315 |
|---|---|
| Households | 136 |
| Saint-Illiers-la-Ville | Yvelines | Île-de-France | France | |
|---|---|---|---|---|
| Main residences2023 | 44.8%−37.6 pts vs France | 91.4% | 88.7% | 82.4% |
| Second homes2023 | 53.0%+43.2 pts vs France | 2.7% | 4.2% | 9.8% |
| Vacant dwellings2023 | 2.2%−5.6 pts vs France | 5.9% | 7.1% | 7.8% |
| Residents who own their home | 71.0%+10.2 pts vs France | 60.8% | 49.2% | 60.8% |
| Tenant residents | 26.4%−11.0 pts vs France | 37.4% | 48.5% | 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 Saint-Illiers-la-Ville
| Year | Flats (multi-dwelling buildings) | Detached houses | Total |
|---|---|---|---|
| 2021 | 0 | 0 | 0 |
| 2022 | 0 | 0 | 0 |
| 2023 | 0 | 0 | 0 |
| 2024 | 0 | 1 | 1 |
| 2025 | 0 | 0 | 0 |
| 2026* | 0 | 1 | 1 |
Source: Sit@del, ministry responsible for housing · recorded on October 3, 2026
Sources: INSEE (census), Sit@del · recorded on October 3, 2026
| Population | 350 |
|---|---|
| Households | 136 |
| People per household | 2.57 |
Change in the population of Saint-Illiers-la-Ville
Between 2012 and 2023, the population changed by +2.9%.
Source: INSEE, population census · recorded on October 3, 2026
Age breakdown
Source: INSEE
What do people aged 15 and over do?
Source: INSEE
| Saint-Illiers-la-Ville | Yvelines | Île-de-France | France | |
|---|---|---|---|---|
| Population trend2012-2023 | +2.9%−1.5 pt vs France | +5.1% | +4.7% | +4.4% |
| Median age2023 | 42.0 years−0.5 yr vs France | 39.6 years | 37.7 years | 42.5 years |
| Share aged under 252023 | 32.4%+3.6 pts vs France | 31.9% | 31.8% | 28.8% |
| Share aged 65 and over2023 | 13.9%−7.4 pts vs France | 16.9% | 15.5% | 21.3% |
| People per household2023 | 2.6+18% vs France | 2.4 | 2.3 | 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 Saint-Illiers-la-Ville, a household has 2.57 people on average, compared with 2.17 in France: more families, so demand leans more towards larger homes.
Source: INSEE, population census · recorded on October 3, 2026
| Saint-Illiers-la-Ville | Yvelines | Île-de-France | France | |
|---|---|---|---|---|
| Median living standard (per year)2023 | €30,810+19% vs France | €31,520 | €28,210 | €25,920 |
| Unemployment rate (aged 15-64)2023 | 10.6%≈ France | 9.6% | 11.2% | 11.0% |
| Activity rate (aged 15-64)2023 | 74.3%−1.4 pt vs France | 77.5% | 76.9% | 75.7% |
| Share of retired people (aged 15 and over)2023 | 22.7%−5.4 pts vs France | 22.2% | 19.7% | 28.1% |
| Share of pupils and students (aged 15 and over)2023 | 7.1%−0.5 pt vs France | 9.0% | 9.4% | 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
Number of businesses located in Saint-Illiers-la-Ville
30 businesses in 2024, compared with 21 in 2014: +42.9% over the period.
| Year | Businesses |
|---|---|
| 2014 | 21 |
| 2015 | 22 |
| 2016 | 19 |
| 2017 | 20 |
| 2018 | 26 |
| 2019 | 28 |
| 2020 | 25 |
| 2021 | 25 |
| 2022 | 26 |
| 2023 | 24 |
| 2024 | 30 |
Source: INSEE, business demography information system · recorded on October 3, 2026
| Saint-Illiers-la-Ville | Yvelines | Île-de-France | France | |
|---|---|---|---|---|
| Number of businesses2024 | 30 | 130,912 | 1,476,257 | 6,437,729 |
| Change in the number of businesses2019-2024 | +7.1%−17.9 pts vs France | +24.9% | +24.6% | +25.0% |
| Businesses per 1,000 inhabitants2024 | 85.7−12% vs France | 88.2 | 118.5 | 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?
Sources: INSEE (SIRENE register), INPI (national business register) · recorded on October 3, 2026
Registrations and insolvency proceedings
* current year, incomplete
From 2021 to 2025, 219 registrations for 38 insolvency proceedings.
| Year | Registrations | Insolvency proceedings |
|---|---|---|
| 2021 | 40 | 10 |
| 2022 | 39 | 3 |
| 2023 | 38 | 7 |
| 2024 | 50 | 8 |
| 2025 | 52 | 10 |
| 2026* | 39 | 8 |
Source: BODACC, official bulletin of civil and commercial announcements · recorded on October 3, 2026
Sources: INSEE, BODACC · recorded on October 3, 2026
In 2024, the overall property tax rate on built properties is 23.15% in Saint-Illiers-la-Ville.
| Rate voted by the commune | 22.08% |
|---|---|
| Intercommunal body, syndicates and special taxes | 1.07% |
| Overall rate on built properties (total) | 23.15% |
| Household waste collection tax (TEOM) | 9.00% |
| Overall rate on undeveloped land | 57.48% |
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 Saint-Illiers-la-Ville, its property tax (taxe foncière) is €1,500 × 23.15% = €347 a year.
On top of this comes the household waste collection tax (TEOM), calculated on the same base: €1,500 × 9.00% = €135. 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 | 22.08% | 23.18% | 7.50% |
| 2022 | 22.08% | 23.14% | 9.00% |
| 2023 | 22.08% | 23.15% | 9.00% |
| 2024 | 22.08% | 23.15% | 9.00% |
Between 2021 and 2024, the overall rate changed by -0.03 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.
Saint-Illiers-la-Ville is on the list of communes where the housing market is tight. A dwelling left empty for more than a year is subject to the tax on vacant dwellings there, and the municipal council may raise the housing tax on second homes by 5% to 60%.
The commune has not voted a surcharge on the housing tax on second homes.
Source: DGFiP, local taxation for individuals (2024 scale) · recorded on October 3, 2026
How to read this list. It shows the services for which at least one establishment is recorded in the commune. A service that does not appear is not necessarily absent: INSEE does not locate every facility with the same precision, and the list only includes the main ones.
Source: INSEE, permanent facilities database 2024
2 public transport stops are located in the municipality, or 5.7 stops per 1,000 inhabitants.
Public transport stops in Saint-Illiers-la-Ville
Outline of the commune, north at the top.
Source: transport.data.gouv.fr, scheduled timetables of networks · recorded on October 3, 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
The risks identified by the State in the territory of Saint-Illiers-la-Ville, what they mean, and what they change for a property.
Medium exposurelevel 2 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, a soil survey is mandatory to sell a building plot and before having a house built. For an existing house, look at the cracks and ask whether a drought claim has already been filed.
Very lowlevel 1 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.
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.
1in the commune
The commune is covered by a prevention plan for: technological risk. 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.
1in the commune
An upper-tier Seveso site is an industrial installation that stores or uses large quantities of hazardous substances.
For a property: A prevention perimeter regulates planning around each site: protective works may be required of existing dwellings there.
2in 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 Saint-Illiers-la-Ville
Outline of the commune, north at the top.
Source: Géorisques, Ministry of Ecological Transition · recorded on October 3, 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 3, 2026