Contents available at: www.repository.unwira.ac.id https://journal.unwira.ac.id/index.php/ARTEKS Research paper doi: 10.30822/arteks.v9i1.2965 Copyright ©2024 Sahid, Anindhita Nugroho Sunartio, Aldyfra Luhulima Lukman, Indri Astrina Indrarani Wirakusumah, Adam Ramadhan, Klarissa Lazuardi, Cheryl Angeline. This is an open access article distributed the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License 99 Challenges of implementing the green building concept in Mosques Sahid * , Anindhita Nugroho Sunartio, Aldyfra Luhulima Lukman, Indri Astrina Indrarani Wirakusumah, Adam Ramadhan, Klarissa Lazuardi, Cheryl Angeline Department of Architecture, Faculty of Engineering, Universitas Katolik Parahyangan Jl. Ciumbuleuit, no. 94, Bandung, Indonesia ARTICLE INFO ABSTRACT Article history: Received December 12, 2023 Received in revised form Feb. 08, 2024 Accepted March 18, 2024 Available online April 01, 2024 The Republic of Indonesia's Ministry of Religion reports more than 700,000 mosques in the country. Insufficient research has been conducted concerning this mosque-turned-building, particularly regarding how it may help the country accomplish its environmental commitments. The Istiqlal mosque received a green building assessment certificate (Excellence in Design for Greater Efficiency) from the International Finance Corporation in April 2022. This certificate should serve as a foundation for future research into the distinctive features of mosque building designs in Indonesia and their potential to contribute to accomplishing national environmental targets. Mosque buildings as an embodiment of the concept of Rahmatan Lil Alamin or mercy for all of nature should be in line with the concept of green buildings which strive to preserve nature. This research aims to determine the challenges of implementing the green building concept in mosque buildings with a case study of two mosques in the city of Bandung. To identify their traits, this study employed observational methods, case studies, and interviews with mosque managers. The Minister of Public Works Regulation Number 21 of 2021 about Green Building Performance Assessment will be employed to examine and assess the gathered data. The outcomes demonstrate that the low-performance value persists. Considerable work is required to achieve the desired results. In-depth talks with stakeholders are also required to map the distinctive qualities of mosque structures and identify methods in which they can support the realization of national environmental preservation objectives while also exemplifying the principles of Rahmatan lil Alamin. Keywords: Green building Mosque Rahmatan lil Alamin *Corresponding author: Sahid Department of Architecture, Faculty oe Engineering, Universitas Katolik Parahyangan, Indonesia Email: sahid@unpar.ac.id ORCID: https://orcid.org/0000-0002-2249- 078X Introduction The Government of the Republic of Indonesia has committed to reducing greenhouse gas (GHG) by its efforts by 26% by 2020 (Bakar 2021). Furthermore, this commitment was stated in the Nationally Determined Contribution document at the end of 2016 (Bakar 2021). The document sets a target of 29% (unconditional) or an emissions reduction target of 834 million tons of CO 2 e compared to business-as-usual conditions. The Republic of Indonesia government anticipates contributions from all parties involved to reach this objective. The property industry may contribute to reaching the NDC target by implementing the Green Building idea into practice. The Green Building Council Indonesia was established in 2009 by several practitioners and academics, and the Greenship Rating Tools were first introduced