The average price per m² in Lormoy (Saint-Michel-sur-Orge) is 2 563 €/m² for an apartment, within a range of 2,3 to 2,8 k€ per m², based on actual notarised (DVF) sales. Over the period, the market fell 6 % over 5 years and rose 0,6 % over the last 12 months, with about 49 transactions per year.

Lormoy, in the north-west of Saint-Michel-sur-Orge, near the Orge.
Apartments in the Lormoy district, in Saint-Michel-sur-Orge, sell at an average price of around 2 563 €/m², based on prices actually recorded (DVF transactions, notarised sales). Between 2 260 and 2 778 €/m² covers half of all sales, the gap depending on the residence, the period of construction, the condition of the building and the proximity of the station. Five-year change: -6 %.
Prices from the DVF file (Demandes de valeurs foncières, published by the DGFiP), transactions actually recorded at the notary, aggregated at district level using the IRIS zoning of INSEE. Cross-referenced with the Notaires de France - INSEE indices. Learn more about our methodology.
After 2 719 €/m² in 2021, the average price in the Lormoy district of Saint-Michel-sur-Orge reaches 2 563 €/m² in 2026, around -6 % over the period.
Shops in the station area, to the east of the district.
Three primary school groups, including Jules-Ferry and Pablo-Picasso, RER C station to the east.
1960s residential blocks set in greenery, Lormoy park and the banks of the Orge.
Lormoy, in the north-west of Saint-Michel-sur-Orge. Google Maps.
Lormoy occupies the north-west of Saint-Michel-sur-Orge, between the station and the river. The district is organised around the rue du Haras, the rue de la Raie-Tortue, the La Source and Parc de Lormoy residences, the rue des Grouettes, the mail de l'Europe, laid out in 2005, and the place Jules-Ferry. To the south, the Sablons area, around the rue Émile-Berthier and the rue des Sablons, is attached to it, as the town hall also does. The Lormoy park, on the Orge riverside walk, has three ponds and a view of the Longpont basilica.
The Lormoy estate was acquired in the seventeenth century by Christophe Pajot, a councillor at the Parlement. The Say family later developed a dairy there, a hunting lodge, then a racehorse stud from 1885. The land was sold off in garden plots from the 1930s, and the La Source, Parc de Lormoy and Boqueteau residences were built in the mid-1960s. The château de Lormoy itself is in the neighbouring municipality of Longpont-sur-Orge.
Lormoy stands at 2 563 €/m², in line with the town-wide average, the second-highest price in Saint-Michel-sur-Orge. With 49 apartment sales a year, nearly half of the municipality's total, it is the town's largest market. It is down 6 % over five years and up 0,6 % over twelve months.
Lormoy is the largest market in Saint-Michel-sur-Orge, with 49 apartment sales a year, and its price, 2 563 €/m², serves as the benchmark for the municipality. The district combines 1960s residential blocks set in greenery, the Lormoy park and the banks of the Orge, three primary school groups and the RER C station to the east. Buyers are families, first-time buyers and working people looking for a family apartment within walking distance of the station. The range, from 2 260 to 2 778 €/m², is the narrowest in the town: the average price is a good guide to an ordinary home in the district. Two points to examine. The price is down 6 % over five years, from 2 719 €/m² in 2021 to 2 563 in 2026, and flat over twelve months: the market shows no recent rise. And in co-owned blocks some sixty years old, the condition of the common areas, the service charges and the energy performance account for most of the difference between two properties.
The average price in Lormoy is 2 563 €/m² for an apartment (actual DVF transactions, notarised sales), within a range of 2 260 to 2 778 €/m² depending on the building, the floor and the condition.
In the north-west of the town, between the RER C station and the Orge, around the rue du Haras, the rue de la Raie-Tortue, the rue des Grouettes and the mail de l'Europe. The Sablons area, to the south, and the Lormoy park, on the Orge riverside walk, are part of it.
No. The château de Lormoy is in the neighbouring municipality of Longpont-sur-Orge. The Saint-Michel-sur-Orge district takes its name from the former estate, whose land was sold off in plots from the 1930s, and is home to the Lormoy park.
Slightly, over five years: the average price went from 2 719 €/m² in 2021 to 2 563 in 2026, which is 6 % lower. Over twelve months, it is flat, at 0,6 %. With 49 apartment sales a year, this is the most reliable trend among the town's districts.
This analysis is published by Immover, an independent observatory founded by Antony Barbier. Data sourced from official sources (DVF, INSEE, Notaries of France).