A housing estate built in 1966 that would still be up to date in terms of energy today without refurbishment would certainly be a rarity. This is also true of the Schenefelder Holt housing estate, which consists of 680 flats in different building typologies and some commercial properties and was in great need of refurbishment. To meet current thermal insulation requirements, thermal insulation of the façade and roof, new glazing and controlled ventilation were necessary. And since it was foreseeable that the intervention would take place in several construction phases and spread over several years, a design concept was developed to uniformly upgrade the appearance of the settlement as a whole and establish it as an attractive residential location in the long term.