Unique loft converted from a former workshop in Montigny-lès-Cormeilles

Ideally situated in the heart of a quiet residential area?right on the edge of La Frette-sur-Seine and just 22 minutes from Paris Saint-Lazare?this detached house/loft boasts a truly unique architectural signature. Born from the transformation of a former locksmith’s workshop, this exceptional home offers 187 m² of living space and a total usable area exceeding 350 m². It strikes a perfect balance between the character of its industrial past and the comfort of a thoroughly contemporary lifestyle.

The vast main living area greets you immediately upon entry, bathed in magnificent natural light streaming through a monumental glass roof. Beneath a soaring cathedral ceiling, the space showcases exposed metal structural elements and centers around a magnificent fireplace with an insert?a unique statement piece. This area features a modern, fully fitted and equipped open-plan kitchen designed for social interaction. Adjoining this is a cozy TV lounge, separated by an elegant glass partition; it offers the flexibility to serve as a fifth ground-floor bedroom. The ground floor is completed by a contemporary shower room with a walk-in shower, built-in storage, a spacious and highly functional laundry room, and an office.

Access to the sleeping quarters is via a stunning articulated metal staircase. It leads to an airy walkway?the loft’s backbone?that overlooks the living area and invites quiet contemplation. This walkway provides access to four lovely bedrooms with sloping ceilings and a warm, inviting atmosphere. The master suite stands out with its large southwest-facing picture window, while the other rooms benefit from state-of-the-art skylights and roof windows; one such room is currently configured as a custom-fitted dressing room featuring a mezzanine level. A second family bathroom perfectly rounds out this floor. Outside, there is a seamless transition to a private, secluded terrace. Facing southwest and newly resurfaced with composite decking, it creates an ideal haven for lunches and evening gatherings. Adjoining this area, three large, heated, and interconnected garages offer spectacular conversion potential?whether for a home office, an artist’s studio, or a collector’s space, depending on your vision.

The property has undergone a major, recent renovation program between 2024 and 2026. The zinc roof has been completely replaced and paired with optimal thermal insulation and new Velux skylights. Enhancing this comfort, a state-of-the-art air-to-air heat pump was installed in 2026, providing high-performance, energy-efficient reversible air conditioning.

Finally, a lifestyle where everything is within walking distance is a reality here. Local shops and the La Frette-sur-Seine train station?offering a direct 22-minute link to Paris Saint-Lazare via Line J?are just a three-minute walk away. Quick access to RER lines A and C further complements the connectivity of this exceptional property, designed for those who appreciate architecture and unique, expansive living spaces.