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Abstract As a highly urbanised city-state with limited rooftop space but large façade areas of skyscrapers, Singapore is particularly suitable for the implementation of building-integrated photovoltaics (BIPV). This study aims to identify relevant barriers that still hinder the greater adoption of BIPV perceived by stakeholders in Singapore, as well as the drivers for BIPV that would lead building sector to adopt BIPV technologies. The study involved five important groups of stakeholders i.e. governmental authorities, building developers, architects, engineers, and PV/BIPV manufacturers to participate in a questionnaire survey. The results identified that on-site generation of clean energy bundled with economic benefits, Green Mark certification, and avoidance of CO 2 emissions are the most influential drivers, while long-term payback period, high upfront cost, and low energy conversion efficiency are the three most substantial barriers to BIPV. Furthermore, one-way analysis of variance (ANOVA) was conducted to examine whether the various stakeholder groups perceive the drivers and barriers differently. It was discovered that various stakeholder groups perceive the drivers similarly, but the significantly different opinions have been perceived on several barriers. This study provides suggestions to overcome barriers to BIPV not only in Singapore, but also other countries that aim to promote BIPV technologies. Highlights • Barriers to and drivers for BIPV development in Singapore were investigated. • Generating renewable energy and achieving green mark certification are influential drivers. • Long-term payback period and high upfront cost are significant barriers. • Stakeholder groups perceive the drivers similarly but the barriers differently. [ABSTRACT FROM AUTHOR]

Abstract Rapid urbanization and the issue of environmental degradation compel developing countries to find a cleaner approach to replace or complement the traditional on-site construction method. Off-site construction (OSC) with its various advantages has been regarded as a promising approach to address the problems confronted in developing countries. However, promoting the adoption of OSC is indeed a tough task that still faces multiple barriers. It is stakeholder collaboration by integrating diverse resources within the construction industry that can potentially address these barriers. Although multiple studies have been conducted from various perspectives, the issue of stakeholder collaboration, as the key to promoting OSC adoption, has been overlooked. This research aims to explore stakeholders’ influencing power over such barriers using two-mode social network analysis. Firstly, 13 barriers to the OSC adoption, as well as 15 stakeholders with the power to overcome these barriers, were identified based on literature and expert judgments. Subsequently, a questionnaire survey was conducted comprising 39 responses from experts with rich experience in OSC in Chongqing, China. Centrality and core-periphery structure analyses were adopted to study the network. The results show that the government and developers have the highest degree centrality, betweenness centrality, and eigenvector centrality, and thus are the most influential stakeholders in the network. Similarly, the lack of knowledge and expertise, and the dominant conventional project process have the highest values of centrality among all barriers. With the density of interaction being 0.814, core stakeholders and barriers have intensive relationships, and the network shows an apparent core-periphery structure. Theoretically, this study demonstrates the use of the two-mode social network in construction research, and practically, this study sheds lights on how to effectively drive the adoption of OSC in developing countries through promoting stakeholder collaboration. Highlights • 13 barriers and 15 stakeholders relevant to the OSC adoption were identified. • Two-mode social network was adopted to link the stakeholders and barriers. • Centrality and core-periphery structure analyses were adopted to study the network. • Strategies were proposed to promote OSC adoption by stakeholder collaboration. [ABSTRACT FROM AUTHOR]

Rapid urbanization poses a significant challenge of accommodating the poor, particularly in developing countries such as China where affordable housing has only been initiated a few years ago and will continue to be developed in the coming years. Two major considerations in affordable housing programs are cost and time, as the ability to meet the needs of low-income households is the main target of these programs. However, it is not a common strategy to address affordable housing shortage by means of incorporating sustainability features. One of critical issues is the lack of sustainability framework to integrate sustainability in affordable housing. This paper aims to identify the key sustainability performance indicators (KSPIs) which are useful to guide the development of affordable housing. A preliminary list of 42 key sustainability performance indicators of affordable housing was identified through an extensive literature review. This was followed by a questionnaire survey to solicit the professional views from three stakeholder groups, namely government, developers and academics in the Chinese construction industry. Via the fuzzy set theory and variance analysis, 24 KSPIs were finally highlighted. These findings provide useful references for policy makers as well as industry practitioners to develop affordable housing programs in a sustainable manner. This helps to achieve the sustainable development at the regional scale. [ABSTRACT FROM AUTHOR]