🏙 Property in Saint-Germain-en-Laye: prices, rents, property tax and trends
🏘 Rue Ducastel — Saint-Germain-en-Laye (78100)
8 registered co-ownerships in the national register (RNIC) are attached to Rue Ducastel in Saint-Germain-en-Laye, for a total of 346 units. The 10 sales of flats recorded between 2024 and 2025 work out at a median price of €7,411/m² (+13% 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 | 2 | €8,211/m² |
| 2025 | 8 | €7,306/m² |
📋 Profile of Rue Ducastel
The buildings on Rue Ducastel in Saint-Germain-en-Laye: 63% of the co-ownerships whose construction period is known date from before 1949; individual heating dominates (0% collective heating); only 13% have a lift. The median co-ownership has 29 units (up to 160).
On the management side, 100% of the co-ownerships whose type of managing agent is known (6) are run by a professional managing agent. The most present firm, FONCIA MANSART, runs 3 of these co-ownerships out of the 6 run by a professional managing agent.
On the market, 10 sales were recorded in the street over the period covered, with a median price of €7,411/m² for flats, i.e. 13% 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 Ducastel
| Firm | Co-ownerships in the street | Units |
|---|---|---|
| FONCIA MANSART | 3 | 107 |
| SARL FB & MB | 2 | 38 |
| SOGESYM | 1 | 39 |
Legal entities declared in the national co-ownership register. Volunteer managing agents (individuals) are never named.
🏢 The co-ownerships on Rue Ducastel
🏷 Latest sales in the street
| Date | Property | Area | Price | €/m² |
|---|---|---|---|---|
| 11/2025 | Flat 2-room | 65 m² | €321,600 | 4,948 |
| 10/2025 | Flat 2-room | 27 m² | €185,000 | 6,852 |
| 10/2025 | Flat 1-room | 13 m² | €100,000 | 7,692 |
| 09/2025 | Flat 1-room | 13 m² | €180,000 | 13,846 |
| 09/2025 | Flat 2-room | 37 m² | €230,000 | 6,216 |
| 02/2025 | Flat 1-room | 19 m² | €161,500 | 8,500 |
| 02/2025 | Flat 1-room | 25 m² | €173,000 | 6,920 |
| 01/2025 | Flat 1-room | 18 m² | €160,000 | 8,889 |
| 09/2024 | Flat 1-room | 24 m² | €223,000 | 9,292 |
| 05/2024 | Flat 3-room | 86 m² | €613,110 | 7,129 |
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 Ducastel in Saint-Germain-en-Laye?
The national co-ownership register (RNIC) lists 8 co-ownerships attached to Rue Ducastel in Saint-Germain-en-Laye, for a total of 346 units.
What is the price per m² on Rue Ducastel in Saint-Germain-en-Laye?
According to the sales recorded between 2024 and 2025 (10 flats, DVF source), the median price is €7,411/m². Across the municipality, the median is €6,544/m².
Which managing agents run the co-ownerships on Rue Ducastel in Saint-Germain-en-Laye?
Among the co-ownerships run by a professional managing agent, the most present firms are: FONCIA MANSART (3), SARL FB & MB (2), SOGESYM (1). The full list is on this page.
How can I contact the managing agent of a co-ownership on Rue Ducastel?
Each listing shows the type of managing agent (professional or volunteer) and lets you contact Syndic Digital, which relays your request.