The average price per m² in Herblay-sur-Seine is 3 647 €/m² for an apartment, based on actual notarised (DVF) sales. About 128 transactions are recorded each year.
Ambience illustration of Herblay-sur-Seine, the old town overlooking the loop of the Seine in the Val-d'Oise.
On the Herblay-sur-Seine market, the reference value for an apartment stands at 3 647 €/m². The stock is mixed: recent buildings and developments of the past decades sit alongside an extensive area of detached housing, inherited from the growth of the municipality through the 20th century. The detached house with a garden keeps an important place here, which sets Herblay-sur-Seine apart from the more densely built municipalities of the inner suburbs; houses trade on average at around 3 982 €/m², a level close to that of apartments. These benchmarks come from the DVF database, which records sales actually registered before notaries.
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 Herblay-sur-Seine market rests on a simple asset: a town on the banks of the Seine, still green and given over to detached housing, linked directly to Paris-Saint-Lazare by train. That combination attracts families and working households looking for more space than in the inner suburbs without moving away from the capital. Demand covers both houses with a garden, rare and sought after, and apartments close to the station and the quays. Properties with a view over the river or close to the old town stand clearly apart from the rest of the market.
Supply remains constrained by the geography of the municipality, hemmed in between the river, the hillsides and the neighbouring towns, which limits large new-build schemes. As everywhere in Île-de-France, energy performance has become a bargaining point: older detached houses that are poorly insulated and dwellings rated at the bottom of the DPE scale, the French energy performance rating, sell at a sharper discount than a few years ago. Against neighbours such as Cormeilles-en-Parisis or Conflans-Sainte-Honorine, Herblay-sur-Seine holds a middle position in the market of this loop of the Seine, more affordable than the Yvelines municipalities close by.
In its stretch of the Seine valley, Herblay-sur-Seine sits above Conflans-Sainte-Honorine and Franconville, and at a level close to that of Ermont, its neighbour in the Val Parisis.
The old town of Herblay-sur-Seine occupies a spur overlooking the right bank of the Seine, some twenty kilometres north-west of Paris, on the edge of the Yvelines. The church of Saint-Martin marks the landscape: built on a terrace at around sixty metres of altitude, it stands some twenty-five metres above the river and gives an open view over the loop of the Seine. The subsoil of the hillsides, rich in gypsum and limestone, was long worked for plaster and stone, an activity that shaped the relief as much as the local economy.
The church of Saint-Martin is the oldest monument in the municipality. Raised in the 12th century on a Merovingian necropolis, it was added to over the centuries: bell tower and Gothic arcades in the 13th century, doorway in the 14th century, chancel and side chapels around the middle of the 16th century. It keeps stained glass windows of the 16th century listed as historic monuments, known for the delicacy of their grisailles. This religious heritage remains the visual landmark of the town, seen from the quays as from the Seine.
The arrival of the railway, at the end of the 19th century, turned the village into a holiday place: well-off families had Art nouveau villas built on the hillsides facing the river. The municipality, which had been called Herblay for centuries, officially took the name Herblay-sur-Seine by decree of 5 November 2018, following a consultation of residents, to assert its identity as a town on the banks of the Seine. It has today around 31 779 inhabitants.
Herblay-sur-Seine has around 31 779 inhabitants and shows a balanced residential profile, where the detached house with a garden keeps a strong place alongside more recent apartments. The town is organised around several sectors: the old centre perched above the river, the Seine quays, the Val d'Herblay close to the water, and quieter detached-housing neighbourhoods towards the plateau. La Patte d'Oie, to the north, concentrates business and retail activity. Buyers are mainly Paris-region families and working households employed in Paris or the inner suburbs, drawn by the direct rail service and by the chance to reach a house, still affordable here while it grows scarce closer to the capital.
For an apartment, the benchmark stands at 3 647 €/m², an average calculated from sales registered before notaries and published in the DVF database. It covers very different properties, from the older studio in the town centre to the recent apartment close to the quays. The address, the storey, the view over the Seine, the year of construction and the energy performance certificate explain most of the gaps. To place your property precisely, a valuation based on comparable sales remains more reliable than the municipal average alone.
The town reads from its relief. The old town, perched on its spur around the church of Saint-Martin, overlooks the river and concentrates the older heritage. Below, the Seine quays and the Val d'Herblay draw their appeal from being close to the water. On the plateau stretch quieter detached-housing neighbourhoods, while La Patte d'Oie, to the north, brings together shops and business areas. These sectors do not all sell at the same level.
Herblay station is served by Line J of the Transilien, which reaches Paris-Saint-Lazare in under half an hour, by way of Conflans-Sainte-Honorine. The same line runs west to Mantes-la-Jolie and Gisors. For journeys by car, the A15 motorway passes nearby and links the municipality to La Défense and the Paris ring road. This double service, rail and road, weighs heavily in the choice of buyers who work in the metropolitan area.
Both coexist, which is not so common at this distance from Paris. The municipality keeps a broad fabric of detached houses with gardens, above all on the plateau and in the detached-housing neighbourhoods, while apartments are concentrated in the recent developments and near transport. Houses trade at a level close to that of apartments, at around 3 982 €/m² on average. The price of a house depends above all on its plot, its condition and its location.
Two points deserve attention. The sectors close to the Seine can be exposed to flood risk: the statement of risks and the planning documents set this out, and are worth consulting before any offer. Beyond that, the subsoil of the hillsides, worked in the past for gypsum, can hold former cavities in certain areas, a point to check with the municipality. Finally, letting a furnished tourist rental follows local rules that need examining according to your plans.
This analysis is published by Immover, an independent observatory founded by Antony Barbier. Data sourced from official sources (DVF, INSEE, Notaries of France).