Purpose: The purpose of this paper is to establish the impacts of good maintenance work for heritage buildings in Malaysia. This purpose is achieved through identifying factors that lead to the lack of maintenance of heritage buildings, establishing strategies to overcome the lack of maintenance of heritage buildings and analyzing the impact of good maintenance work on heritage buildings in Malaysia. Design/methodology/approach: A quantitative method was employed for this study to identify the variables that most influence the maintenance of heritage buildings in Malaysia. The respondents were the owners of the heritage buildings in Peninsular Malaysia. There were 65 owners of heritage buildings identified from the official website of the Department of National Heritage, Ministry of Tourism and Culture, Malaysia. Simple random sampling was used to obtain the sample size of the targeted respondent. A total of 56 questionnaire surveys were distributed to the owners of heritage buildings. In total, 37 respondents returned the completed questionnaires, resulting in a response rate of 66 percent. The data were analyzed by Descriptive Statistics using Statistical Package for the Social Science software version 20. Findings: Results show that the factors that lead to the lack of maintenance of heritage buildings are limited finance, the absence of maintenance guideline and ill-defined maintenance policy. The strategies to overcome the problem include providing a financial budget by the respective authorities, establishing a standard maintenance guideline and revising the existing policy. Research limitations/implications: The paper is limited to the identification of factors that lead to a lack of maintenance and strategies to overcome the problem for the heritage buildings in Malaysia. The respondents are the owners of heritage buildings in Malaysia. The focus is given to them due to the fact that it will help them in understanding the importance of managing and operating for their buildings. Practical implications: The results offer value-added information to building managers who are responsible for maintaining heritage buildings. Findings show that good maintenance work on heritage buildings can enhance the value and safety of the building as well as preventing heritage buildings from deteriorating. Social implications: The quality of maintenance could be enhanced by focusing on the important variables that affect the quality of maintenance works of heritage buildings. Originality/value: Limited studies had been carried out in the context of the maintenance of heritage buildings, especially in Malaysia.

Purpose: This systematic review examines the relationship between energy-efficient strategies, Indoor Environmental Quality (IEQ), and financial feasibility within Malaysia’s Green Building Index (GBI)-certified office buildings. GBI is a comprehensive rating system that assesses buildings' environmental impact and performance based on sustainable criteria. It is recognized internationally and complies with World Green Building Council (WGBC) standards and supports the Sustainable Development Goals (SDGs). Data from GBI reported that as of June 2024, a total of 696 projects were certified from 1,223 projects registered, which equals 29.1 million square meters. Design/ Methodology/ Approach: Utilizing a systematic review using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) protocol, Articles were selected from two leading databases, Web of Science (WoS) and Scopus, between 2014 and 2024. Findings: From the review, it can be concluded that there are 32 findings related to the green office buildings in Malaysia were categorized into three key themes: Energy Efficiency and Environmental Performance (EEEP), IEQ and Occupant Satisfaction (OS), and Economic and Cost Considerations (ECC). The study highlights that although initial financial investments may be challenging, long-term operational savings and sustainability can be achieved through passive design strategies and improved building management practices. Research limitations/implications: The findings can assist in keeping up with the rapid pace of scientific publications and help accelerate the understanding of ideas in the context of localized data and insights that are often missing in global literature. This also can attract interest from various disciplines including stakeholders, architects and engineers in Malaysia, promoting the adoption of energy-efficient practices while ensuring occupant comfort and financial viability. This study could also assist further research on the direction of studies to explore the scalability of these strategies in diverse building types, particularly in the context of different climate conditions contributing to SDG 9, SDG 11 and SDG 12. Originality /value: This study provides a comprehensive understanding of the key ideas from existing literature and offers a basis for measuring energy efficiency and IEQ in green office buildings, assisting for sustained improvements in the Malaysian context.