The average price per m² in Grande-Synthe is 1 458 €/m² for an apartment, based on actual notarised (DVF) sales. About 19 transactions are recorded each year.
Atmospheric illustration of Grande-Synthe, a municipality of the Dunkerque conurbation, in the Nord department.
The price shown for Grande-Synthe, 1 458 €/m², is an apartment price, calculated on single-lot sales actually registered before notaries in DVF data, the French notarised sales database. The flat market here remains narrow: 77 sales in five years, or around fifteen a year, in a municipality where most apartments belong to social landlords and rarely change hands. The dominant market is the house, with 429 sales over the same period, and it sells for more per square metre, at around 1 672 €/m².
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.
Grande-Synthe reached its population maximum in 1982, with 26 231 inhabitants; it has 20 239 in 2023 according to INSEE, against 22 966 in 2017. This decline describes a market without tension, where demand does not push prices upwards. The flat segment remains marginal, with around fifteen sales a year, because most blocks of flats are still owned by social landlords. On volumes as low as these, the delivery of a single new residence is enough to shift the average for a given year: the price shown should be read as an order of magnitude, not as a valuation accurate to the square metre.
The local driver remains industrial and port employment. The steelworks, established in the municipality since the early 1960s, and the port of Dunkerque structure the employment area: Grande-Synthe has twice as many jobs as working residents, according to INSEE. On transport, the complete free travel on the buses of the urban community authority since 1 September 2018 and direct access to the A16 bring the municipality closer to the rest of the conurbation. These factors support first of all the demand for family houses, rather than creating a market for apartments.
Grande-Synthe shows the lowest price level in this comparison: its neighbour Coudekerque-Branche, Dunkerque, which it borders, and Calais on the same coast all sit above it. The gap remains moderate with Coudekerque-Branche and is sharper with Dunkerque and Calais.
Before industry arrived, Grande-Synthe was a village of farms and market gardeners, set on land reclaimed from the sea and drained by the wateringues, the network of ditches and canals specific to the Flemish maritime plain. Between the two world wars, a barge shipyard opened along the canal de Bourbourg and the Deux-Synthe housing estate was built to house its workers; the municipality then had fewer than 3 500 inhabitants. During the night of 15 to 16 September 1944, the German army, falling back on the Dunkerque pocket, drove out the inhabitants and blew up the village and its church. The pocket only surrendered on 9 May 1945, and the village had to be rebuilt almost entirely.
The fate of the municipality changed with the decision of the French State to build a large steelworks by the sea, the Usinor plant, on the territory of Grande-Synthe. Work began at the end of the 1950s on an embankment reclaimed from the sea, and the first blast furnace was lit on 8 February 1963. To house the workers, the Nouvelles Synthes priority development zone (ZUP) was created in 1959: 5 500 dwellings, including 4 000 in slab blocks and towers, spread between Saint-Jacques, Europe and Albeck, before the Courghain, designed in the 1970s. The population rose from around 1 500 inhabitants in the 1950s to 13 117 in 1968, then 26 231 in 1982, its peak. The plant, now ArcelorMittal Dunkerque, still occupies a third of the municipality.
From the 1970s onwards, the town sought to correct growth that had been too rapid. It created the Puythouck, a vast natural area to the west, around an artificial lake where schoolchildren come to plant their own tree. From 1982, some of the towers built twenty years earlier were demolished and replaced by parks, such as the one in Albeck, attached to the municipality in 1981. Urban renewal then transformed the Courghain, and it continues with the dismantling of the last towers of Europe Nord. This policy earned Grande-Synthe the title of first French Capital of Biodiversity, in 2010.
Grande-Synthe has 20 239 inhabitants according to INSEE, the French statistics institute, over around 21 square kilometres, a large part of which is taken up by the steelworks and the port installations. The housing stock is split almost evenly between houses, slightly more than one dwelling in two, and apartments. More than 95 % of dwellings are main residences, and renting dominates: 38 % of households own their home, and more than half rent from a social landlord, still according to INSEE. You will find families, employees of industry and of the port, and first-time buyers looking for a house with a garden a few kilometres from Dunkerque. Three quarters of the housing stock dates from 1946 to 1990: energy performance and the condition of the common areas deserve careful examination before buying.
The average apartment price stands at 1 458 €/m², based on single-lot sales actually registered before notaries in DVF data. That average rests on a narrow market, 77 transactions in five years, which mixes dwellings from the 1960s to the 1980s with a few recent residences in the centre, sold at higher prices. The gap with this benchmark therefore depends heavily on the age of the building, the floor, the condition of the property and its energy performance rating.
Because the volumes do not allow it. The municipality has ten statistical sectors, and none reaches the reliability threshold we apply, thirty apartment sales over five years. Most blocks of flats belong to social landlords and are not sold on the open market. We prefer a single page backed by all the transactions of the municipality to a series of fragile neighbourhood prices.
The real market of the municipality is the house: 429 sales over five years, against 77 for apartments. Houses trade at around 1 672 €/m², roughly 15 % more than apartments per square metre. The individual housing stock mixes post-war brick houses, housing estates from the 1970s and 1980s and a few more recent developments. The choice turns on the plot, upkeep and service charges as much as on the price per square metre.
The town was built in successive neighbourhoods. Saint-Jacques, Europe, where the town hall stands, and Albeck form the first estates of the 1960s, largely reshaped since then by demolitions and the creation of parks. The Courghain and Moulin, more recent, were laid out around the former drainage ditches of the Flemish plain. The Puythouck and its lake border the town to the west. These differences in urban form weigh on prices, but flat sales are too rare to put a figure on them neighbourhood by neighbourhood.
The municipality borders Dunkerque, whose centre lies around six kilometres away. The bus network of the urban community authority, free for all passengers since 1 September 2018, serves the town from the Puythouck interchange. The SNCF halt of Grande-Synthe receives TER regional trains between Dunkerque and Calais. The A16 motorway offers three exits towards the different neighbourhoods, and the RN225 links up with the A25 towards Lille.
This analysis is published by Immover, an independent observatory founded by Antony Barbier. Data sourced from official sources (DVF, INSEE, Notaries of France).