Property Prices in Saint-Ouen-l'Aumône2026 property valuation

The Saint-Ouen-l'Aumône market is one of the few in our coverage to fall back over five years. The average price of an apartment went from 3 121 €/m² in 2021 to 3 047 in 2025, a fall of 4 %, with a high point in 2022 at 3 243 €/m² and a trough in 2024 at 2 943. Over the last twelve months the town regains 3,5 %, which marks a recovery after that trough. With one hundred and twenty-eight apartment sales a year, the volume is enough for these movements to be readable.

Two features set this town apart. The first is the scale of the gap between districts, 54 % from the most expensive to the most affordable, on a territory where those two extremes are three kilometres apart. That gap is not a regular gradation: five districts out of six sit between 3 139 and 3 552 €/m², and Centre-ville alone drops away at 2 307. The second is the size gradient, 59 % from a studio to a large apartment, the steepest in this batch. A third point deserves to be made: the town gains around one hundred and thirty-seven inhabitants a year according to the local housing plan, and its share of owner-occupiers is falling, from 52 % in 2013 to 47,3 % in 2018, which reflects a market where buy-to-let is taking more space.

The history of Saint-Ouen-l'Aumône begins with a funeral procession. A chapel was built at the end of the seventh or the beginning of the eighth century to mark the passage of the body of saint Ouen, carried back towards Rouen in 686. It became the church of Saint-Ouen, rebuilt in Romanesque style in the first half of the twelfth century, of which only the west portal survives, then enlarged from the end of the twelfth to the middle of the thirteenth, with a rib-vaulted nave in flamboyant Gothic in the first half of the sixteenth. The name of the town comes from "l'Aumône", the land granted to the quarter of the Saint-Lazare leper hospital, a twelfth-century leprosarium that stood on the site of the present-day Sainte-Marie clinic.

The decisive fact lies elsewhere, and it dates from 1236: that year Blanche de Castille founded the royal abbey of Notre-Dame-la-Royale, known as Maubuisson abbey. The territory itself bore the name of Maubuisson from the thirteenth to the eighteenth century, the village depending politically and militarily on Pontoise while living off the activity of the nuns. The abbey has been the contemporary art centre of the Val-d'Oise since 2001. The town has five listed historic monuments, among them the tithe barn and the small covered bridge on the chaussée de Maubuisson, which allowed the cloistered nuns to reach the Clos-du-Roi, the kings' country residence, without being seen.

The second half of the nineteenth century brought the industrial revolution: joinery, engineering, railway rolling stock, ink manufacture, starch works, a distillery, and a population that reached three thousand before the First World War. The movement has never stopped. The town today has four business parks, les Béthunes, les Bellevues, Épluches and le Vert-Galant, which together hold around seven hundred companies over close to six hundred hectares, or 40 % of the municipal territory. Wikipedia describes them as the largest cluster of small and medium-sized businesses in Europe.

It is the Cergy-Pontoise new town that made the town what it is today, and the outcome is twofold. Economically, it benefited greatly. In terms of town planning, Wikipedia is categorical: the operation "durably unbalanced it in terms of the structure of its districts, and Saint-Ouen-l'Aumône is still looking for a real town centre", after the demolition in the 1970s of the early twentieth-century town hall and of the faubourg de la Basse Aumône. That sentence explains the market better than any analysis: the town has two centres, the rebuilt administrative one and the historic shopping street, and they are the two ends of its price scale.