SINERGI Vol. 27, No. 1, February 2023: 89-100 http://publikasi.mercubuana.ac.id/index.php/sinergi http://doi.org/10.22441/sinergi.2023.1.011 A. M. Iswidyantara & A. E. Husin, Key success factors analysis for improving cost … 89 Key success factors analysis for improving cost performance of green retrofit infrastructure on the jetty project Ato Muhan Iswidyantara, Albert Eddy Husin * Department of Civil Engineering, Faculty of Engineering, Universitas Mercu Buana, Indonesia Abstract Several rating definitions must be met following the envision's system. The envisioned system aims to develop the green building concept in the existing jetty building. These definitions are quality of life, leadership, resource allocation, nature, climate, and resilience. This sustainability is needed to initiate changes in the planning, design, and provision of sustainable infrastructure together with the company. This also applies to implementing long-term infrastructure investments that are more cost-effective, resource-efficient, and adaptable. The study uses a qualitative and quantitative method, where data is obtained by distributing questionnaires and simulating using Statistical Products and Solution Services (SPSS). The application of Value Engineering (VE) and Life Cycle Cost Analysis (LCCA) has been chosen by researchers on existing jetty buildings with the green jetty concept, with investment costs in economic green jetty buildings and a return on investment costs of less than four years. In achieving the ten most influential factors in improving cost performance in sustainable dock construction, the results of the SPSS simulation processing obtained the ten most influential factors, namely: Planning, Energy, Siting, Materials, Ecology, Community, Economy, Operation, and Maintenance Cost, Follow- up Inspection, and Labor Experience. Copyright ©2023 Universitas Mercu Buana This is an open-access article under the CC BY-NC license Keywords: Cost Performance; Envision; Green Retrofit; Jetty; Life Cycle Cost Analysis; Value Engineering; Article History: Received: June 26, 2022 Revised: July 21, 2022 Accepted: July 28, 2022 Published: February 2, 2023 Corresponding Author: Albert Eddy Husin, Department of Civil Engineering, Faculty of Engineering, Universitas Mercu Buana, Indonesia Email: albert_eddy@mercubuana.ac.id INTRODUCTION Research on Green Infrastructure and Buildings in Indonesia is still scarce. Consideration of environmental sustainability is simply not in the mainstream policy yet. Research on the green jetty building will contribute to the body of science in Environmental Engineering and open a new perspective of development that can help sustain the green environment. Green Infrastructure is a spatial planning concept that applies environmentally friendly infrastructure. In this study, the environmentally friendly buildings that will be discussed are jetties which in Indonesia has not implemented a green jetty. The purpose of a green jetty is to create an infrastructure that does not interfere with the natural cycle of the environment, starting from the planning, development, and operation to the maintenance stages, paying attention to aspects of protecting, saving, reducing the use of natural resources. Green Infrastructure includes natural systems and engineered solutions. The Sustainable Development Goals (SDGs), also known as the global goal, were adopted by all United Nations members in 2015 as the universal voice to end poverty, protect the planet and ensure everybody enjoys peace and prosperity in 2030. The world leader and governments agree on the agenda of SDGs, which consist of 17 goals and 169 targets, as shown in Figure 1 [1].