A structural equation model to unveil the effect of human behaviour to the satisfaction of sustainable refurbishment for high-rise residential buildings

Abstract

Improving the energy performance of existing building refurbishment has been identified as one of the key measures to reduce greenhouse gases (GHGs) emissions and combat climate change. According to Environmental Protection Department, buildings in Hong Kong take up almost 90% of urban electricity consumption. Sustainable building refurbishment not only can help decrease energy consumption but may also improve building’s overall condition, and thus prolong its life, uplift the living conditions, ensure better health and safety as well as minimize the negative effects to environment.

To respond to the energy emission reduction, many researchers focus on technical improvements through various refurbishment methods. However, there is a research gap in determining the appropriate refurbishment solutions for high-rise residential buildings in developed cities like Hong Kong. The challenge is aggravated as there are a number of owners and occupants in multi-storey residential buildings and their behaviour can be very different. Albeit more and more attentions have been attributed to human behaviours and occupant satisfaction, little has been done to examine their effects to the choices and success of sustainable refurbishment solutions. This study aims to systematically analyse the effect of human behaviour to the satisfaction of sustainable refurbishment by setting up a unified model so as to maximize the opportunity for emission reduction without sacrificing the satisfaction of owners and occupants.

Literature review was first conducted to attain the knowledge of sustainable refurbishment and human behaviour. Then, a list of potential sustainable building refurbishment method items was compiled under five criteria through literature review. In order to further examine the suitability of sustainable building refurbishment methods in Hong Kong scenario from the perspective of owners and occupants, a questionnaire survey was administered. Following that, literature review and interviews were carried out to identify a set of critical success factors (CSFs) of electing sustainable refurbishment strategies as well as key performance indicators (KPIs) of a sustainable building refurbishment scheme. Based on that, another questionnaire survey was conducted to examine the occupants’ perception to the relative importance of the identified CSFs and KPIs. Finally, a structural equation model was set up to unveil the relationships between occupants’ satisfaction and project success, and the findings were validated through expert interviews. The results shows that disruption is the most important factors affecting occupants’ decisions, followed by Management and Organization; Comfort; Cost; and Health and Safety. The technological and environmental accomplishments are proven to be the most important KPIs to the success of a sustainable building refurbishment project. The model developed can help decision-makers select on suitable sustainable building refurbishment methods to meet the social expectations of occupants while achieving the carbon emission target.