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"Zu den drei Schlüsseln" housing co­op­er­a­tive

Building envelope re­fur­bish­ment

The "Zu den drei Schlüsseln" housing co-operative commissioned Gruner's General Planning division to design and implement a project to refurbish the envelope of its 1956-built properties at Rennweg 91, 93, 95 and 97 in Basel. The project team was charged with implementing an energy-efficient upgrade of the building envelope, subject to a specified cost limit, while conserving the special architectural features of the residential facilities. The project was developed step by step, with careful consideration of all the options and in close consultation with the housing cooperative's executive board.