🏙 Property in Thiverval-Grignon (78850)
Thiverval-Grignon has a population of 1,023, a density of about 91 inhabitants per km². Advertised rents for flats are around €18.3/m² per month (2025). Between 2022 and 2025, advertised rents are up by 15.1%. The overall property tax rate on buildings (taxe foncière) is 17.15% in 2025. The average reference taxable income per household is €55,447 (2024), and 70% of households pay income tax. Thiverval-Grignon has had 1 natural disaster declaration since 1982, 1 of them for floods or mudslides. The national register lists 7 registered co-ownerships (124 units).
📰 Thiverval-Grignon at a glance
Département: Yvelines (78) · Region: Île-de-France
Size and profile
Thiverval-Grignon has a population of 1,023: it is a medium-sized municipality for its département (median: 1,302 inhabitants). Population density there is 91 inhabitants per km²: a predominantly rural profile.
Rents and prices
At €18.3/m² per month, the advertised rent is in the top quarter of its département (median: €16.1/m²). Between 2022 and 2025, the advertised rent has risen by 15.1%, faster than the median of the municipalities in its département (11.2%).
Incomes and taxation
The average reference taxable income per household (€55,447 in 2024) is above the département median (€48,984). It has risen by 40.7% since 2018, faster than the median of the municipalities in its département (16.5%). 70% of tax households there pay income tax, against 67% for the département median. The overall property tax rate (17.15%) is 11.4 points lower than the median of the municipalities in its département (28.54%).
Hazards and energy
Thiverval-Grignon has had 1 natural disaster declaration since 1982, i.e. far fewer than the département median (6). 3 natural risk prevention plans are in force in the municipality.
Co-ownerships
The national register lists 7 co-ownerships (124 units), or about 6.8 per 1,000 inhabitants.
Points to watch before buying or renting
- Before buying into a co-ownership: ask for the minutes of the last three general meetings, the maintenance log, the amount of the works fund and the state of unpaid charges.
Summary written automatically from the figures on this page, comparing the municipality with the median of the municipalities in its département (or of France when the département has too few municipalities with data).
💶 Prices and rents: how they have changed
Advertised rent for flats (€/m²/month)
Between 2022 and 2025: +15.1%
| Advertised rent 2025 | €/m² per month |
|---|---|
| Flat, 1 to 2 rooms | 21.4 |
| Flat (all) | 18.3 |
| Flat, 3 rooms or more | 16.1 |
| House | 15.2 |
31 listings observed. Estimate calculated across a group of neighbouring municipalities, less precise than a municipal estimate. These are advertised rents, service charges included: they are higher than the rents of existing leases. The estimation method was revised in 2022: only the 2022 and later editions, which are comparable with each other, are shown.
👥 Household incomes
Average reference taxable income per household (€)
Between 2018 and 2024: +40.7%
| Incomes 2024 | Value |
|---|---|
| Tax households | 472 |
| Average reference taxable income per household | €55,447 |
| Households paying income tax | 70.3% |
Tax statistics from the DGFiP: income for 2024, declared the following year. The reference taxable income is an average: very sensitive to high incomes, it is not a substitute for a median income. The incomes are those of the tax households living in the municipality, not only those of co-owners.
🌊 Natural hazards
Natural disaster declarations per year (since 1982)
1 declaration in total
| Indicator | Value |
|---|---|
| “floods and mudslides” declarations | 1 |
| “ground movements” declarations | 1 |
| Natural risk prevention plans in force | 3 |
| Radon potential (class 1 of 3) | Low |
A declaration recognises a state of natural disaster for a given event; it triggers the “natural disasters” cover of home insurance policies and of the building’s insurance. “Drought” declarations relate to the shrinking and swelling of clay soils, a frequent cause of cracks in buildings. A risk statement (état des risques) must in particular be attached to a sale or lease when the property lies in an area covered by a prevention plan, in seismic zone 2 to 5, or with a class 3 radon potential. This page presents municipal data: it does not replace the risk statement drawn up for the property’s address.
🧾 Property tax and local taxation
Overall property tax rate (buildings, %)
Between 2021 and 2025: −0.1 point
Household waste collection tax rate (%)
Between 2021 and 2025: −0.7 point
The overall rate adds the municipal share and the inter-municipal share. The tax due by an owner equals this rate applied to half of the home’s cadastral rental value, reduced where applicable by exemptions.
🏢 The co-ownerships of Thiverval-Grignon
Registered co-ownerships
Between 2022 and 2025: +40.0%
Budget and arrears are declared by the managing agents to the register; outliers are discarded and the median is used. They are only available for the years in which the register publishes them.
🧑💼 The main professional managing agents
| Firm | Co-ownerships in Thiverval-Grignon | Units |
|---|---|---|
| Lamy | 1 | 58 |
| Foncia Mansart | 1 | 14 |
| Cotoit | 1 | 12 |
❓ Frequently asked questions
What is the average rent per m² in Thiverval-Grignon?
The rent map shows an advertised rent of about €18.3/m² per month for a flat in 2025, with a prediction interval of €15.7 to €21.3/m². Advertised rents include service charges.
What is the property tax rate in Thiverval-Grignon?
The overall property tax rate on buildings (municipality and inter-municipal authority) is 17.15% in 2025. The amount due depends on this rate and on the property’s cadastral rental value.
What is the average income of residents of Thiverval-Grignon?
According to tax statistics (income of 2024), the average reference taxable income is €55,447 per tax household, across 472 households. This is an average, pulled up by very high incomes; it is not a substitute for a median income.
What are the natural hazards in Thiverval-Grignon?
1 natural disaster declarations have been published since 1982. Source: GASPAR database (Géorisques).
How does Thiverval-Grignon compare with neighbouring municipalities?
Advertised rent: 18.3 €/m²/month, rank 6 of 9 municipalities compared, from highest to lowest (neighbours’ median: 18.4 €/m²/month). Average reference taxable income: 55,447 €, rank 6 of 9 municipalities compared, from highest to lowest (neighbours’ median: 57,262 €). Property tax rate: 17.15 %, rank 9 of 9 municipalities compared, from highest to lowest (neighbours’ median: 27.29 %).
How many co-ownerships are there in Thiverval-Grignon?
7 co-ownerships are registered in the national register there, for 124 units.
📊 Thiverval-Grignon compared with neighbouring municipalities
- Advertised rent: 18.3 €/m²/month, rank 6 of 9 municipalities compared, from highest to lowest (neighbours’ median: 18.4 €/m²/month).
- Average reference taxable income: 55,447 €, rank 6 of 9 municipalities compared, from highest to lowest (neighbours’ median: 57,262 €).
- Property tax rate: 17.15 %, rank 9 of 9 municipalities compared, from highest to lowest (neighbours’ median: 27.29 %).
| Municipality | Distance | Inhabitants | Rent (€/m²/month) | Median price (€/m²) | Average income | Property tax | DPE F or G | Disaster decl. |
|---|---|---|---|---|---|---|---|---|
| Thiverval-Grignon | — | 1,023 | 18.3 | — | €55,447 | 17.15% | — | 1 |
| Saint-Germain-de-la-Grange | 2.4 km | 1,847 | 18.4 | — | €58,758 | 24.73% | — | 7 |
| Davron | 2.9 km | 295 | 21.3 | — | €91,632 | 26.30% | — | 1 |
| Plaisir | 3.4 km | 31,811 | 18.2 | 2,942 | €36,462 | 38.39% | 1.3% | 12 |
| Neauphle-le-Château | 3.9 km | 3,250 | 18.7 | 3,132 | €55,766 | 25.35% | 10.8% | 11 |
| Chavenay | 4.0 km | 1,723 | 21.3 | — | €82,127 | 29.90% | — | 8 |
| Villiers-Saint-Frédéric | 4.3 km | 3,395 | 18.4 | — | €51,289 | 21.41% | 0.0% | 10 |
| Beynes | 4.4 km | 7,704 | 17.0 | — | €44,280 | 40.45% | 12.8% | 9 |
| Crespières | 4.5 km | 1,719 | 16.9 | — | €92,129 | 28.27% | — | 5 |
The 8 nearest municipalities (as the crow flies, from the centre). Latest values available; “—”: data not published or too few sales. Rents are estimated for groups of municipalities: neighbours may share the same estimate. The rank compares the municipality with these neighbours, not with the whole of France.
📚 Sources and method
Each indicator comes from an open dataset that is kept over time: when a source is updated or corrected, the old value stays on record, which makes it possible to follow changes from one year to the next.
- Ministère de la Transition écologique, base GASPAR (Géorisques) — Licence Ouverte 2.0. Retrieved in October 2026.
- Demandes de valeurs foncières © DGFiP / Etalab — Licence Ouverte 2.0. Retrieved in October 2026.
- Carte des loyers © Ministère de la Transition écologique / ANIL — Licence Ouverte 2.0. Retrieved in October 2026.
- INSEE, API Géo (Etalab) — Licence Ouverte 2.0. Retrieved in October 2026.
- ASN / IRSN, potentiel radon des communes — Licence Ouverte 2.0. Retrieved in October 2026.
- DGFiP, impôt sur le revenu par collectivité territoriale (IRCOM) — Licence Ouverte 2.0. Retrieved in October 2026.
- Registre national d'immatriculation des copropriétés (ANAH) — Licence Ouverte 2.0. Retrieved in October 2026.
- DGFiP, fiscalité locale des particuliers — Licence Ouverte 2.0. Retrieved in October 2026.
- Sale prices: single-property sales (flats) in the streets where the register lists co-ownerships; median calculated from 10 sales or more.