The average price per m² in Coignières is 3 375 €/m² for an apartment, based on actual notarised (DVF) sales. About 10 transactions are recorded each year.
Atmospheric illustration of Coignières, on the edge of the Rambouillet forest in the Yvelines.
In Coignières, the benchmark price stands at 3 375 €/m² for an apartment. The municipality, brought into the new town of Saint-Quentin-en-Yvelines in the mid-1970s, has a stock in which flats are now the majority, at close to 52 per cent of dwellings. These values come from DVF data, the French record of notarised property sales, meaning the transactions actually registered with notaries, and not from listing estimates. The level sits above Maurepas, its immediate neighbour, and below the residential municipalities of the Chevreuse valley.
Prices from the DVF file (Demandes de valeurs foncières, published by the DGFiP), transactions actually recorded at the notary at municipality level. Cross-referenced with the Notaires de France - INSEE indices. Learn more about our methodology.
The Coignières market is that of a new-town municipality that has reached maturity. The slight fall in population recorded since 2017 reflects a stock that is now complete, without the waves of arrivals of the preceding decades. The municipality keeps two lasting assets: its station, which places it among the municipalities reachable from Paris without a car, and a price lower than that of several of its Yvelines neighbours, which makes it an entry point for first-time buyers in the western Paris region.
How things develop will depend on the redevelopment of the trunk road and its retail parks, a project under way in several comparable municipalities of the outer Paris region, where commercial approach roads are gradually being reworked into mixed-use areas. Such a transformation would lastingly change the residential image of the municipality. In the short term, the market remains driven by the recent blocks of flats, now in the majority, and by a persistent price gap with Montigny-le-Bretonneux and Le Mesnil-Saint-Denis.
The municipality holds an intermediate position: its prices exceed those of Maurepas, its immediate neighbour, and stay below those of Montigny-le-Bretonneux and Le Mesnil-Saint-Denis.
Coignières occupies a relatively flat plateau in its eastern part, the Mauldre valley beginning to the west of the territory, about twenty-nine kilometres south-west of Paris. The old village formed along the road linking Paris to Bretagne, a through route that fixed its vocation as a place of passage. The church of Saint-Germain-d'Auxerre, dating from the 13th century, keeps the memory of it, with a 15th-century stained-glass window listed as a historic monument, and an 18th-century coaching inn completes the group.
That role as a road staging post long defined the economy of the village: lodging, catering and services for travellers on the road west. The municipality remained modest until the 20th century, on the edge of the Rambouillet forest, in a setting of farmed plateau and woodland. The route nationale 10, which extends this historic axis, still crosses the territory and is at once its main advantage in terms of access and its main urban constraint.
The mid-1970s marked the break: Coignières was brought into the new town of Saint-Quentin-en-Yvelines, which triggered rapid urban growth. Two large retail parks were built along the trunk road and form the second retail hub of the urban area, with annual turnover above five hundred million euros. Coignières station, on the line from Paris-Montparnasse to Brest, is served by the Transilien network. The municipality had 4 321 inhabitants in 2023, slightly down since 2017.
According to INSEE, the French statistics institute, Coignières has 4 321 inhabitants and 94,1 per cent of its stock is occupied as a main residence. The structure of the stock has shifted: apartments now account for 51,9 per cent of main residences against 47,7 per cent of houses, a consequence of the recent blocks of flats. Owner-occupiers hold 46,4 per cent of main residences, a low share for the Yvelines, which reflects an active rental market. Buyers are working people from Saint-Quentin-en-Yvelines and the western Paris region, often first-time buyers, drawn by the station and by a price lower than that of the neighbouring municipalities.
The benchmark price stands at 3 375 €/m² for an apartment. This figure comes from DVF data, the sales actually signed before notaries. It is an average: a recent dwelling close to the station and an apartment from the first schemes of the new town sit on either side of this baseline, depending on floor area, storey and the energy performance of the property.
The municipality has its own station, on the line from Paris-Montparnasse to Brest, served by the Transilien network, and lies about twenty-nine kilometres south-west of Paris. The route nationale 10 crosses the territory and provides the road link towards Rambouillet and towards the Saint-Quentin-en-Yvelines urban area. This twofold service is the first selling point of the local residential market.
The two large retail parks built along the trunk road form the second retail hub of the urban area, with more than five hundred million euros of annual turnover. They bring jobs and local services, but they also generate heavy traffic on that route. For a purchase, the distance between the property and this route is a decisive criterion of comfort and of resale value.
Being brought into the new town of Saint-Quentin-en-Yvelines in the mid-1970s steered housing production towards blocks of flats. The trend continued with the recent schemes: according to INSEE, apartments today account for 51,9 per cent of main residences, against 47,7 per cent of houses. This shift explains an owner-occupier rate of 46,4 per cent, low for the department.
The noise and traffic linked to the route nationale 10 affect part of the territory and appear in the planning documents and the noise classifications. The church of Saint-Germain-d'Auxerre, with its listed 15th-century stained-glass window, creates a protection perimeter for visible works. The closeness of the Rambouillet forest brings rules on the woodland edge. The local planning document can be consulted at the town hall.
This analysis is published by Immover, an independent observatory founded by Antony Barbier. Data sourced from official sources (DVF, INSEE, Notaries of France).