Green Retrofitting in the Adaptive Reuse of Colonial Buildings: Case Study of GCT Van Dorp & Co in Semarang Old Town

Abstract

This study addresses the adaptive reuse of colonial heritage buildings with green retrofitting, focusing on the former GCT Van Dorp & Co building in Kota Lama Semarang. The research aims to develop a conceptual framework integrating environmental sustainability with cultural preservation in tropical urban contexts. The methodology is qualitative, involving case study analysis, field observation, and literature review. The population includes colonial heritage buildings in Semarang’s historic district, with the GCT Van Dorp & Co building as the sample. Data collection instruments include architectural surveys and environmental performance assessments. Analysis techniques combine thematic and content analysis to identify sustainable retrofit strategies. Results reveal key green retrofitting strategies: optimizing natural ventilation and passive lighting, introducing adaptive facade interventions, utilizing eco-friendly local materials, and deploying vegetation to improve microclimate. The study concludes that integrating these strategies under the proposed "Adaptive Green Conservation" model enhances both heritage value preservation and environmental efficiency while allowing functional adaptation with minimal intervention. This model offers practical guidance for sustainable heritage conservation in tropical climates.