House in L'Isle-Adam, Val-d'Oise

L'Isle-Adam — Exceptional 365 m² mansion with 3,500 m² grounds
Situated in the heart of L'Isle-Adam, widely regarded as one of France's most pleasant towns, this exceptional character property dating from 1850 occupies a prestigious island position on the banks of the River Oise, under an hour by direct train from Paris Gare du Nord.
A little history
The house stands on the Île de la Cohue, the smallest of the three islands of the Oise, alongside the Île du Prieuré and the Île de la Dérivation. Its name recalls the crowds who gathered to attend festivities on its banks under the Ancien Régime. The property was originally the bridgemaster's house, belonging to the leaders of the Compagnons de l'Arche, who were responsible for hauling vessels through this particularly challenging stretch of the river. Immediately adjacent stands the Pont Cabouillet, a listed historical monument dating from the sixteenth century.
Fully restored to the highest standard, this luminous 12-room property offers 365 m² of living space across three floors, set within 3,500 m² of private grounds, with an outbuilding, an independent garage and direct access to the river.
Garden level (total surface area: 157 m²)
This lower level, opening directly onto the park and terrace, features marble floors throughout. It comprises a vast 97.86 m² reception room with summer kitchen, ideally suited to entertaining and hosting gatherings. This self-contained and convivial space allows younger generations to enjoy the house to the full without disturbing the upper floors. The level also includes a 6.96 m² landing, a 2.91 m² hallway, a 1.10 m² storage cupboard, a 2.08 m² shower room and a 2.42 m² WC. A cellar, boiler room, workshop and garden store complete this level.
Ground floor (living area: 99.93 m²)
The principal level, also in marble, features high ceilings with elegant period mouldings. It comprises a 16.14 m² entrance hall, a large 38.19 m² drawing room with a beautiful bay of three full-length double windows with French doors opening directly onto the magnificent terrace, a 15.87 m² study, a 27.86 m² fitted kitchen and a 1.87 m² WC.
First floor (living area: 76.78 m²)
Parquet floors throughout characterise this level, which comprises a 12.46 m² landing, three bedrooms of 14.13 m², 20.10 m² and 10.97 m² respectively. The master bedroom of 20.10 m² benefits from an en-suite bathroom of 9.59 m² and direct access to a magnificent balcony overlooking the gardens. This level also includes a 2.81 m² shower room, a 2.25 m² utility room, two hallways of 3.78 m² and 1.88 m², and a 1.41 m² WC.
Second floor (living area: 55.85 m²)
Also in parquet, the top floor comprises a 15.30 m² landing, four bedrooms of 13.80 m², 16.41 m², 11.01 m² and 9.41 m² respectively, a 5.48 m² shower room and a 1.23 m² storage cupboard.
Equipment and installations
The property benefits from all modern comforts: an air-to-water heat pump, dual thermodynamic water heaters, double-flux mechanical ventilation, a full alarm system, double glazing throughout and shutters on all openings. The garage is equipped with a 22 kW electric vehicle charging point, enabling rapid charging. A bicycle store and kennels complete the outbuildings.
The property has two boreholes supplying 12 m³ of water per hour, capable of providing the property with drinking water subject to appropriate treatment.
River access
The property benefits from direct access to the River Oise, offering considerable potential for water-based activities, in an exceptional natural setting at the very heart of the island.
Transport and location
L'Isle-Adam is situated on the right bank of the Oise, approximately thirty kilometres north of Paris as the crow flies. A founding member of the Parc naturel régional du Vexin français, it forms a conurbation of approximately 16,000 inhabitants and remains one of the most sought-after residential areas in Île-de-France, renowned for its exceptional quality of life.
Transport links are excellent, both locally and internationally:

By train: Transilien line H — 48 minutes from L'Isle-Adam — Parmain to Paris Gare du Nord, with direct connections to Eurostar, Thalys, the Paris Métro, the RER and the national rail network.
By car: 10 minutes from the A16 motorway and the national motorway network.
By air: 30 minutes from Paris Charles de Gaulle Airport.

Diagnostics
DPE energy rating: class C (118 kWh/m²/year) — emissions: class A (3 kg CO₂/m²/year). Estimated annual energy costs between €2,570 and €3,530. The asbestos survey identifies the presence of composite fibre-cement slates on the roof requiring further analysis. The electrical installation presents anomalies requiring the attention of a qualified electrician. The lead paint survey (CREP) identifies the presence of lead-containing coatings on certain class 1 diagnostic units, in good condition.

*Agency fees are payable by the vendor.
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Information about risks to which this property is exposed is available on the Géorisques website : https://www.georisques.gouv.fr