Purpose: This paper aims to disclose the role and features of various IT systems for environmental building performance (EBP) in facilities management. Design/methodology/approach: The study focuses on IT systems used for facilities management in four organisations. The study is based on a maximum variance case study in which the selected organisations have different organisation type and portfolio size. Three organisations are from Denmark and one is from the UK. Findings: Several IT systems can be used for managing EBP. EBP in IT systems is primarily reflected through energy management, with specific focus on monitoring and reporting electricity, heating and water consumption. Furthermore, greenhouse gas emissions related to energy consumption can be calculated in some IT systems, while other environmental categories like building materials and recycling potentials are not adequately supported by the systems covered in this study. Some IT systems offer additional features relating to EBP, such as waste management and space management, but the study shows that these features are not demanded at the current point. Practical implications: The results can be used to support decision-making in organisations to improve EBP in facilities management by IT systems. Originality/value: This study contributes with new knowledge on how IT systems are used in different organisations for managing EBP. The paper also shows how various IT systems can add value to real estate organisations and facilities management departments and support their business processes relating to EBP.