The development of high-rise buildings worldwide has given rise to significant concerns regarding their excessive electricity consumption. Among the various categories of high-rise structures, hotels used for business and conferences stand out as particularly extravagant in their energy use. The consequence arising from excessive energy usage is an escalation in carbon emissions, which is a primary driver of global warming. Therefore, this study aims to investigate the energy use intensity (EUI) of a hotel building located in Jakarta, Indonesia. In order to improve energy performance, this study explored various options for renovating the building envelope, such as incorporating insulation and a roof covering, as well as implementing building-integrated photovoltaics (BIPV). The building envelope renovations demonstrated a notable reduction in energy use by 15.8–27.7% per year. BIPV, such as curtain walls and double-skin façades, generated an energy use reduction of 4.8–8.6% per year. Remarkably, by combining the two approaches (i.e., adding insulation and a roof covering in the building envelope and adopting BIPV as double-skin façades), the potential reduction in energy use reached up to 32.2% per year. The findings can assist decision-makers in developing building renovation strategies for high-rise buildings while considering energy conservation.

Work activities on construction projects can experience disruptions caused by various things, one of the causes is the occurrence of work accidents. Identification and early analysis of potential hazards in each work packet, work methods, work activities, resources and environments in the WBS (Work Breakdown Structure) can prevent work accidents. Thus the need for WBS standardization is very important in presenting the assessment of risk, impact and frequency arising from workplace accidents. The purpose of this study was to develop a risk-based WBS standard for safety planning on dam construction. The results of this study are WBS standards, implementation methods, activities, potential hazard risks, safety planning using risk-based WBS standards, WBS dictionaries and WBS checklists on dam construction work, as an effort in preventing, reducing or eliminating the accident in dam construction work.

The planning of a Work Breakdown Structure project is inevitable, because WBS is the initial stage of project management that divides the activities into small work packages making it easy to manage. While the nature of a project is unique, it basically has elements of construction work that are relatively similar for the same project, so standardizing of the work is possible. The existence of standardization will speed up the project planning process and will reduce costs during the project planning period. This research has a goal of developing WBS standardization on port projects and identifies risks that may occur during project implementation and consider them in the cost estimation process. Risks are obtained from the perspective of the contractor as the project implementer. The study is limited to port construction projects. The data collected came from a questionnaire survey to experienced contractors on a port construction project. The results of this study are expected to help the contractor on the estimated costs to be able to know and anticipate the risks that may occur during the implementation of the port construction.

Housing development, as part of economic development, must be supported by energy availability in order to achieve sustainable growth. One of the approaches to supporting renewable energy promotion is to design and build energy efficient housing. However, the optimal design of such buildings faces two conflicting requirements, namely the consideration of cost effectiveness and minimum environmental impact. The high costs of energy efficient buildings, such as the near Zero Energy House (nZEH), are due to the high price of the materials and equipment used, such as photovoltaic (PV) panels, insulation and other supporting materials. Indonesia is situated on the equator and benefits from sunlight throughout the year. Nonetheless, this potential has not been fully realized, as the solar-generated energy technology for housing comes at a high price. Therefore, the objective of this study is to find the cost optimum combination of validated design variables for an nZEH which suit the tropical climate conditions of Indonesia. Experiments and a case study are employed in the study to validate the design variables for an optimum nZEH design, which include building orientation, PV panels, fenestration, and passive design. The study finds that the cost optimum nZEH design achieved 72 percent site-energy savings and 21 percent savings in the total Net Present Value (NPV) of life cycle costs, with insignificant incremental initial construction costs in enhancing the design.

The construction works of flyover is common in a developing country as well as developed country all over the world. Flyover is an infrastructure that is built to overcome the massive congestion that cannot be overcome with the use of traffic light. In the construction process of a flyover, traffic is the one main problem that always occurred. To minimize that problem, the flyover construction should be planned and managed effectively. With the development of WBS and dictionary of WBS, the project stages will be planned and managed in details that can be used to analyse work packages, defined methods, activities, and resources that will help to decrease the occurring problems. The WBS Dictionary for the construction works of flyover projects in this study is developed using archive analysis and survey methods, which consists of six (6) levels including project name, division, sub of works, work packages, activities, and resources.

The Indonesian government is accelerating road and bridge infrastructure to connect regions in the last 10 years. In the construction of the bridge, the latest