Refurbishment of the Herdern High-rise Building

The slab-shaped high rise in western Zurich is part of the Herdern Migros headquarters, which opened in 1965 and is now listed as an industrial heritage site. Over the years, the brick facade of the 17-storey building has become weatherworn and is undergoing comprehensive refurbishment. The urban and preservation context as well as the building’s proportions are particularly significant in this respect.

The work comprises the static and energetic renovation, including HVAC renewal. On the shorter sides, the load-bearing structure is being reinforced, while the existing brick facades and parapets will be replaced and thermally insulated all around. The new fair-faced masonry walls resemble the old ones in brick format, texture and colour. New aluminium windows with triple insulation glazing meet the thermal and acoustic specifications. Inside, the ribbed concrete ceilings of the office spaces will be uncovered and will serve as temperature buffer. They create a workshop-like atmosphere that matches the industrial history and aesthetic of the building.

The setback top storey, surrounded by a roof terrace, houses an executive board room. The entire space, along with the small kitchen, will be refurbished and offers panoramic views of Zurich West and the Alps.

Location Zurich, Switzerland

Programme Refurbishment of listed, 19-storey office building (1 underground, 18 above ground), 500 workplaces, seminar rooms

Competition 2018, 1st Prize Gigon/Guyer Architekten with WaltGalmarini

Planning/Construction 2019–2023

Client Genossenschaft Migros Zurich

Gross Floor Area 9‘948 m2

Team G/G Planning/Execution: Stefan Thommen (Team Manager), Urs Meyer (Project Manager), Milica Brockmann, Andy Gratwohl, Arend Kölsch, Pieter Rabijns, Urh Urbancic, Luisa Wittgen

Construction Management Spiegel + Partner AG, Zurich

Cost Planning/Scheduling Spiegel + Partner AG, Zurich

Structural Engineer WaltGalmarini AG, Zurich

Electrical Engineer Eplan AG, Reinach

Fire Safety Migros Engineering Solutions, MGB

MSR Concept-G AG, Winterthur

Heating/Cooling Concept-G AG, Winterthur

Ventilation Engineer Concept-G AG, Winterthur

Facade Reba Fassadentechnik AG, Chur

Photos Tom Licht (Drone image)

Study Commission 2018