Inadequate budget control is one of the major challenges that adversely affect the maintenance of a building. The cost of plant asset maintenance of the commercial building is a larger proportion of the overall cost of operation. It is important to allocate financial resources appropriately so that, before serious damage occurs, maintenance measures can be taken. Accordingly, a well-defined maintenance budget (MB) makes it possible to recognise opportunities for creating continuous business performance improvements within the financial constraints of a company. Although required building maintenance can be carried out successfully with an adequate budget, the budget is not well defined in current industrial practice and Sri Lanka is most likely dealing with the same problem. Thus, this study aimed to develop a framework to enhance the practice of a well-defined MB for commercial buildings in Sri Lanka. The qualitative approach was adopted to address this study. A comprehensive literature review was done and five case studies were performed using ten semi-structured interviews to collect the primary data. The interviewees were selected based on their knowledge in the field of maintenance cost planning. Data were analysed through content analysis using both manual and NVivo 12 software. The research finding revealed that prime barriers of prepare an accurate MB are poor planning of maintenance work and resources, faulty maintenance, changes in country market condition, and poor financial support. The key strategies to overcome the barriers are to select the right budget method, arise awareness of top management about building maintenance and avoid faulty maintenance.