In Malaysian building construction projects, quality assessment is important to ensure the success of a project. The Quality Assessment System for Building Construction Work (QLASSIC) introduced by the Construction Industry Development Board (CIDB) covers four main components, which are structural works, architectural works mechanical and electrical works and external works. This paper examines problems in assessing the quality of building construction work in electrical work. This research used the concurrent triangulation design, which implemented the quantitative and qualitative methods. Three instruments were used in this preliminary research, which were the focus group, interview and QLASSIC assessment questionnaire. A total of 69 respondents comprising clients, contractors and QLASSIC assessors took part in the questionnaire survey. Focus group discussions and semi-structured interviews were held with 20 site supervisors and five site supervisors from the Selangor State Development Corporation, respectively. The data analysis shows two main problems faced by construction site supervisors, which are lack of quality assessment training held by the company and incompetence of site supervisors in assessing electrical work quality. Thus, the quality of building construction projects can be influenced by on-site competency and training.