Plantassage, Sierre







The new Glarier-La-Croix–Plantassage neighborhood serves as the city’s new gateway, located west of Sierre and in the heart of Valais. As provided for in the current PAD since 2019, three residential buildings, each featuring a commercial ground floor, are being built at the foot of a vineyard-covered hillside and aligned along the cantonal road.
On the downtown side, the existing tree line is extended, and a new pedestrian walkway runs alongside the new retail spaces. A service road provides safe access for motor vehicles and cyclists from the main road to the underground commercial and private parking garage. On the town entrance side, a stone retaining wall is preserved to maintain the landscape’s continuity toward the vineyards: the third building blends seamlessly into the landscape, is situated higher up, and offers private gardens to the first apartments.
Between the buildings, stairways lead pedestrians to the play and recreation areas located at the rear of the site and bordered by a large orchard. Two walkways provide access from the north to the apartments (primarily 2.5-room units intended for rental), which feature balconies or loggias on the south side, offering beautiful views of both valley floors. On the walkway side, a spacious entryway can accommodate a home office for occasional remote work.
A continuous dual structural framework across the three buildings ensures visual continuity across all three facades, which are subtly differentiated by balcony-loggias that project outward (in the building without retail spaces) or by loggias that lend a more urban character (in the buildings with retail spaces). This system allows for flexibility in the mix of rental apartments: it is possible anywhere to combine a studio with a 2.5-room apartment to form a 3.5-room apartment.
The neighborhood’s energy supply is entirely provided by renewable energy sources. Photovoltaic panels installed on the roofs generate a large portion of the neighborhood’s electricity, while heat pumps power the heating and domestic hot water systems.
mandate type: direct mandate
client: NOGA Développements Immobiliers SA
period: 2025 - ongoing
program: 3 residential buildings comprising 104 units and a 1,300-square-meter ground-floor retail space
services provided : preliminary studies, preliminary design, construction design, architectural and landscape design, public notice application, handling of objections
architecture and landscape: Raum404
mobility: Viatron
geotechnical engineering: Charly Berthod
physics: Amstein+Walthert Lausanne
structure: Crettaz & Partenaires
MEP: VHTechnic
fire protection: Richard Conseils & Associés
acoustics: Bisson acoustique
geometer: IG Group
environment: Impact
images: TheThird
project lead: Oscar Buson, Charlélie Michel
site area: 7'000m2. Determinant floor area 8407m2
