B4 House conversion and extension, Zurich
Beat Bühler
Product Spec Sheet

ElementBrandProduct Name
WindowsJansen
BathtubDRUMMONDS
Terrazzo Euval
Folding sliding shuttersEHRET
Vario-SL
Cooking CounterLacanche
Sully 2200
Wood-shuttermensch rolladen
Lumina 6

Product Spec Sheet
Bathtub
Folding sliding shutters
Vario-SL by EHRET
Cooking Counter
Sully 2200 by Lacanche
Wood-shutter
Lumina 6 by mensch rolladen

B4 House conversion and extension, Zurich

weberbrunner architekten as Architects

This single-family house is part of one of the oldest sections of Witikon, an outlying neighbourhood on a panoramic south-facing slope with a view of the city of Zurich. The compact cubic building was built in 1927 and is characterized by the Heimatstil and neoclassical architectural forms. The existing building has been restored, converted and extended on the ground and basement floors with a new addition.

photo_credit Beat Bühler
Beat Bühler
photo_credit Beat Bühler
Beat Bühler

Improvements and better lighting of the top floor were achieved by enlarging the skylights and opening up the attic areas. A spacious kitchen and a dining area are located on the extension's ground floor and a studio is in the basement. An additional internal staircase in the extension connects the two levels and the lower garden area with the ground floor. 

photo_credit Beat Bühler
Beat Bühler
photo_credit Beat Bühler
Beat Bühler

The extension was built as a 2-storey steel skeleton structure on a reinforced concrete base. Its filigree and industrial character comes from the use of a window system made of slim profiles with outward-opening casements. The wraparound window façade in the kitchen recalls a summer house. A patio door opens onto a natural stone platform in the garden.

photo_credit Beat Bühler
Beat Bühler
photo_credit Beat Bühler
Beat Bühler

The historic building fabric was preserved, supplemented and upgraded to suit new living standards, therby conserving resources and retaining the aura of the old building.

photo_credit Beat Bühler
Beat Bühler
photo_credit Beat Bühler
Beat Bühler

Team:

Architects: weberbrunner architekten

Civil engineering: DAWI AG

Building physics and pollution abatement: Gartenmann Engineering AG

Building services: P. Schärli und Partner Sanitärplanung GmbH

Finished photos: Beat Bühler

Modell photos & Drawings: weberbrunner architekten

photo_credit Beat Bühler
Beat Bühler
photo_credit Beat Bühler
Beat Bühler

Materials Used:

Jansen: Janisol Arte 2.0
Ehret: Folding sliding shutter Vario-SL
Antikhaus Historische Fenster: System Antikhaus
ABL Schweiz: Wood-shutter
Lacanche: Sully 2200
Farrow&Ball: Different paint colours
Euval: Cargrey
mensch rolladen: Lumina 6
Drummonds: The Wye
Storama: Suntime Orienta

photo_credit weberbrunner architekten
weberbrunner architekten
photo_credit weberbrunner architekten
weberbrunner architekten
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