The outcome of the proposed research on heritage buildings could benefit the industry, including EVOQ Strategies’ work as they have been involved in a number of projects on heritage buildings. Keeping the above in mind, the following general objectives are identified for the current research: - Provide a detailed overview of existing technologies as well as the opinions of experts in the field of energy performance sustainability assessment for heritage buildings. Thus, in a sense, it serves as a benchmark for different researchers looking to design their own assessment tool.