M. Pınar Mengüç, Cem Keskin, Ruken Karakuş, Damla Kaleli and Gökçe Tomrukçu from the Center for Energy, Environment and Economy, examined the climate crisis demands urgent action from individuals, companies, and governments to reduce carbon emissions and limit global temperature rise. This is especially crucial for the built environment, where energy efficiency and consumption behavior play vital roles. This research focuses on renovating a 175 sqm historic terraced house in Istanbul’s Fener district, within a heritage protection area that limits external changes. The project emphasizes sustainable strategies, passive design, and occupant behavior analysis to reduce energy demand, ensuring high standards during construction and effective postoccupancy phases. The methodology showcases how to approach complex renovation projects for a lasting impact.