Eco-certification schemes are usually launched with various incentives provided by local governments to facilitate green building development and building energy retrofits. A number of barriers to building energy retrofitting have been identified in previous literature, while the barriers to the eco-certification of existing buildings are under-researched. Drawing on a set of building data retrievable from the BEAM Society and other sources, we carried out an analysis and found the building energy retrofitting, as well as the certification process, were unwelcomed in multi-owned residential buildings. The identified shortfall is put forward from the perspectives of transaction cost theory and agency theory. The findings reveal that high transaction costs incurred during negotiations and coordination among a large number of co-owners within a typical apartment building can outweigh the benefits of retrofitting and eco-certification. Besides, the remuneration structure of third-party property management agents discourages agents from facilitating co-owners to initiate retrofitting. This study provides significant implications for policymakers to understand the concerns of building owners and managers over the decisions and the processes of both the building energy retrofits and eco-certification. The problems and barriers unveiled in this study will facilitate the refining of current energy efficiency policies and related incentives designs. @en

Project duration is one of the methods to measure the efficiency of project implementation. This study identifies the factors influencing the project duration of urban village redevelopment projects (UVRPs) in China. Based on the theory of new institutional economics and behavioral economics, this study develops three hypotheses regarding the causal relationship between institutional arrangement and project duration. Statistical analysis of data on 439 UVRPs collected from seven Chinese cities revealed that projects implemented through top-down institutional arrangements were more likely to take a long time than those implemented through bottom-up institutional arrangements. Projects implemented through top-down and government funding were more efficient than those implemented through top-down and villager funding. For bottom-up projects, there was no conclusion about whether village funding or private developer funding led to shorter project duration. Other determinants, including city, project attributes and initiation year, number of households involved, size of temporary relocation fee, and methods of selecting relocated housing, calculating temporary relocation fee and calculating relocation area influenced project duration@en