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BLOG / 12.05.2026

The perfect blend: introducing Seventyseven

Every building project is unique in its own inimitable way, and every property has its own distinct character. Seventyseven, however, stands apart: this exclusive residential development just a stone’s throw from Luxembourg City is defined by its variety.

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The number seven lies at the heart of the concept. Spread across three floors, Seventyseven comprises a total of seven residential units – each offering its own unique advantages. Developed in close collaboration with the team at Architecture + Aménagement S.A., the result is a living space where comfort takes centre stage.

Connected by design: Résidences à Steinsel

One of the development’s standout features is its relationship with the neighbouring building, Seventynine. While each complex has its own entrance, the two are subtly connected via a shared lower level, providing space for private basement rooms, parking and bicycle storage.

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The apartments themselves offer a wide range of layouts and sizes. From spacious three-bedroom apartments to two-bedroom homes and compact studio flats, Seventyseven caters to a variety of needs. Regardless of size, each unit reflects the high standards that are synonymous with JANS.

Sustainability planning

Excellence defines every aspect of the project – including its energy concept. “We installed cascading heat pumps in each residential block,” explains François Lafontaine from JANS. 

“Another key feature is the insulated, grooved plaster façade with projecting windows.” Measures like these have enabled the development to achieve the highest possible energy rating: AAA.

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Arguably its greatest asset is the location. Seventyseven and Seventynine are situated in the centre of Luxembourg, just outside Luxembourg City, which can be reached quickly and easily by public transport.