Price of a 4-room apartment (T4) in Osny
In Osny, the median price of a T4 is €2,899/sq.m, i.e. about €229,021 for an average area of 79 sq.m. Data from actual DVF transactions by the DGFiP (8 sales over the 12 months ending 31 December 2025).
Price range (T4)
What DVF sales say about the price of a T4 in Osny
Compared with the neighbouring towns tracked by Briveo where this property type is measured, Montmorency comes out at €3,625/sq.m, about 25% above, and Sarcelles at €1,875/sq.m, about 35% below. This property type takes about 5% of local activity, 8 of the 147 apartment and house sales counted over twelve months. Osny measures 5 property types, and the T4 comes 5th on price per sq.m, 5th on sales volume over 12 months. The average area of the T4 sold, 79 sq.m, is about 38% larger than that of the apartments sold in the town, 57 sq.m. At €2,899/sq.m, the median price is out of the town's apartment range, below its 1st quartile. Across all the town's apartments, whatever their number of rooms, the median price per sq.m has moved +10.3% over one year, based on DVF sales published by the DGFiP.
Observed sale prices of a T4 in Osny
Of the sales of a T4 à Osny, half closed between 175,000 € and 267,250 €, for a median price of 218,710 €.
Half of the T4 sold measure between 77 and 82 sq.m.
Three years of sales
| Year | Sales | Median per sq.m |
|---|---|---|
| 2023 | 15 | €2,697/sq.m |
| 2024 | 6 | €2,595/sq.m |
| 2025 | 8 | €3,187/sq.m |
Source and method
- Property transfer records (DVF), published by the French tax authority (DGFiP)
- Sales recorded from 1 January 2023 to 31 December 2025
- Based on 8 sales
- Figures computed on 18 October 2026
The town
Osny covers 12.5 km², lies between 27 and 102 m above sea level and had 17,954 inhabitants in the 2023 census.
Osny [oni] is a commune in Val-d'Oise, in the Île-de-France region, through which the Viosne and another branch of it called « la Couleuvre » flow. Its inhabitants are known as the Osnyssois and Osnyssoises. A village in the Vexin français, the commune experienced significant demographic growth from the 1970s onwards, following its incorporation into the new town of Cergy-Pontoise, as well as rapid urbanisation.
The full property page of the town
From Wikidata and the Wikipedia article « Osny », licensed CC BY-SA 4.0, read on 13 October 2026. Translated from the French article. Read the article
Other property types in Osny
Price of a T4 in nearby cities
Cities tracked by BRIVEO in the same department, median for the same property type when available.
Frequently asked questions, T4 in Osny
Q1What is the price of a T4 in Osny in 2026?
In Osny, the median price of a T4 is €2,899/sq.m, with a range of €2,273 to €3,476/sq.m (1st to 3rd quartile), based on DVF sales published by the DGFiP.
Q2What budget for a T4 of 79 sq.m in Osny?
For the average observed area (79 sq.m), the indicative budget goes from about €179,567 (1st quartile) to €274,604 (3rd quartile), around €229,021 at the median price. Indicative calculation, DVF price per sq.m multiplied by the area, excluding notary fees.
Q3How does the price of a T4 compare with apartments in Osny?
The median price of a T4 in Osny is about 17% below the city's apartment median (€3,477/sq.m), based on DVF sales published by the DGFiP.
Q4How many T4 sales in Osny?
The DGFiP DVF database records 8 sales of this type in Osny over the last 12 months.