🏙 Property in Saint-Germain-en-Laye: prices, rents, property tax and trends
🏘 Rue Diderot — Saint-Germain-en-Laye (78100)
3 registered co-ownerships in the national register (RNIC) are attached to Rue Diderot in Saint-Germain-en-Laye, for a total of 755 units. The 11 sales of flats recorded between 2024 and 2025 work out at a median price of €6,983/m² (+7% compared with the median for Saint-Germain-en-Laye, €6,544/m²).
Change in the median price per m² (flats)
| Year | Sales | Median price |
|---|---|---|
| 2024 | 9 | €7,150/m² |
| 2025 | 2 | €5,972/m² |
📋 Profile of Rue Diderot
The buildings on Rue Diderot in Saint-Germain-en-Laye: the co-ownerships are mostly fitted with collective heating (67%); 67% have at least one lift. The co-ownerships there are large (median of 119 units, up to 625).
On the management side, 100% of the co-ownerships whose type of managing agent is known (3) are run by a professional managing agent. No firm dominates: each professional managing agent runs one co-ownership in the street.
On the market, 14 sales were recorded in the street over the period covered, with a median price of €6,983/m² for flats, i.e. 7% above the median for Saint-Germain-en-Laye.
Statistics calculated on the co-ownerships of the street for which the information is recorded in the national register (RNIC).
🏛 Professional managing agents on Rue Diderot
| Firm | Co-ownerships in the street | Units |
|---|---|---|
| FONCIA MANSART | 1 | 625 |
| SARL FB & MB | 1 | 119 |
| CABINET SENNES | 1 | 11 |
Legal entities declared in the national co-ownership register. Volunteer managing agents (individuals) are never named.
🏢 The co-ownerships on Rue Diderot
🏷 Latest sales in the street
| Date | Property | Area | Price | €/m² |
|---|---|---|---|---|
| 10/2025 | Flat 2-room | 79 m² | €427,500 | 5,411 |
| 06/2025 | Flat 2-room | 75 m² | €490,000 | 6,533 |
| 12/2024 | Flat 5-room | 150 m² | €1,025,000 | 6,833 |
| 10/2024 | Flat 3-room | 83 m² | €630,000 | 7,590 |
| 09/2024 | Flat 4-room | 94 m² | €750,000 | 7,979 |
| 07/2024 | House 4-room | 163 m² | €2,079,040 | 12,755 |
| 07/2024 | Flat 5-room | 150 m² | €900,000 | 6,000 |
| 07/2024 | House 9-room | 284 m² | €2,980,750 | 10,496 |
| 06/2024 | Flat 6-room | 116 m² | €1,320,000 | 11,379 |
| 04/2024 | Flat 3-room | 100 m² | €715,000 | 7,150 |
| 04/2024 | Flat 4-room | 135 m² | €1,071,600 | 7,938 |
| 04/2024 | Flat 3-room | 84 m² | €586,538 | 6,983 |
Listings in Saint-Germain-en-Laye on Leboncoin
Single-property sales (excluding grouped sales), without street numbers. Source: “Demandes de valeurs foncières” © DGFiP / Etalab, Open Licence 2.0. Co-ownerships: national co-ownership register; addresses: Base Adresse Nationale. Syndic Digital is not affiliated with Leboncoin.
📍 Other streets in Saint-Germain-en-Laye
❓ Frequently asked questions
How many co-ownerships are there on Rue Diderot in Saint-Germain-en-Laye?
The national co-ownership register (RNIC) lists 3 co-ownerships attached to Rue Diderot in Saint-Germain-en-Laye, for a total of 755 units.
What is the price per m² on Rue Diderot in Saint-Germain-en-Laye?
According to the sales recorded between 2024 and 2025 (11 flats, DVF source), the median price is €6,983/m². Across the municipality, the median is €6,544/m².
Which managing agents run the co-ownerships on Rue Diderot in Saint-Germain-en-Laye?
Among the co-ownerships run by a professional managing agent, the most present firms are: FONCIA MANSART (1), SARL FB & MB (1), CABINET SENNES (1). The full list is on this page.
How can I contact the managing agent of a co-ownership on Rue Diderot?
Each listing shows the type of managing agent (professional or volunteer) and lets you contact Syndic Digital, which relays your request.