Loft Unique Issu D'un Ancien Atelier à Montigny Lès Cormeilles

Ideally located in the heart of a quiet and residential area, right on the edge of La Frette-sur-Seine and just 22 minutes from Paris Saint Lazare, this independent, detached house/loft reveals a truly unique architectural signature. The result of transforming a former locksmith workshop, this exceptional living space offers 187 m² of living area and over 350 m² of usable space. It perfectly balances the charm of its industrial past with the comfort of a thoroughly contemporary home.

The vast living room unfolds at the first step, bathed in magnificent light from a monumental glass roof. Under a stunning cathedral ceiling, the space showcases an exposed metal structure and centers around a beautiful fireplace insert, a true centerpiece. This area includes a modern open kitchen, fully fitted and equipped, designed for conviviality. Adjacent to it, a cozy TV lounge, separated by an elegant glass partition, offers ideal flexibility to become a fifth bedroom on the ground floor. The ground floor also features a contemporary bathroom with a walk-in shower, built-in storage, a large, fully functional laundry room, and an office.

Access to the sleeping area is via a splendid articulated metal staircase. It leads to an aerial walkway, the true backbone of the loft, overlooking the living room and inviting contemplation. This walkway distributes four lovely attic bedrooms with a warm atmosphere. The master suite stands out with its large southwest-facing bay window, while the other rooms benefit from skylights and state-of-the-art roof windows, including a bedroom currently set up as a custom dressing room with a mezzanine. A second family bathroom ideally completes this level.

Outside, the transition is seamless to a private terrace with no overlooking neighbors. Facing southwest, it has been completely redone in composite wood, creating a peaceful haven perfect for lunches and evenings. Continuing on, three large heated and connected garages offer spectacular potential for conversion: professional office, artist’s studio, or collector’s space, depending on your aspirations.

The property has undergone a significant and recent renovation program carried out between 2024 and 2026. The zinc roof was completely redone, combined with optimal thermal insulation and the installation of new Velux windows. To enhance comfort, 2026 saw the installation of a state-of-the-art air-to-air heat pump, providing the benefits of efficient reversible air conditioning that is particularly economical.

Finally, the ’all on foot’ lifestyle is an absolute reality here. Local shops and La Frette-sur-Seine station, connecting to Paris Saint Lazare in just 22 minutes via Line J, are only a three-minute walk away. Quick access to RER A and C further perfects the connections of this exceptional property, designed for lovers of architecture and rare volumes.

ENERGY CLASS: D / CLIMATE CLASS: B
Estimated annual energy costs for standard use, based on energy prices from the year [hidden information] (including subscriptions): between €3090 and €4230 (subscriptions included). Current owners’ annual energy expense, subscription + VAT: €1926. Information on risks to which this property is exposed is available on the Géorisques website for the relevant areas.

Please note that, in accordance with article [hidden information] of the monetary and financial code, a copy of the ID of all visitors will be requested before the visit.

Christophe Vanel (EI) Sales Agent
Number: [hidden information] RSAC of Pontoise
Christophe VANEL (EI) Sales Agent - RSAC Number: - Pontoise.
Information on the risks to which this property is exposed is available on the Géorisques website: https://www.georisques.gouv.fr/