In the past few decades, Nigeria has witnessed increases in activities in the construction sector, but there have not been developed a robust quality assessment system for building contractors in Lagos State, Nigeria. The aim of this study is to develop a quality assessment system for building contractors in Lagos state. In order to realize this aim, the study assess an adopted conceptual framework as well as areas of improvement with regard to how their organization does quality assessment.The study employed a descriptive case study design where data was collected from senior managers, project managers, engineers, architects, quantity surveyors, and technical managers working with building construction companies in the Lagos Metropolitan Area using the mixed method approach. Quantitative data was collected using questionnaire from 109 randomly selected participants and analysed using descriptive and inferential statistics. Qualitative data was collected through interviews with 9 purposively selected respondents and analysed using the thematic analysis technique. The improvement areas identified were: Staff education and training, Information technology, Involvement of senior leaders, customization of existing quality assessment tools, partnering with contractors, suppliers and other stakeholders, change management and involving other stakeholders. This study recommends that developing a model for guiding the process of assessing quality among Lagos and Nigerian contractors should incorporate prescribed steps, methods, tools, and procedures that local contractors should use in the assessment of quality. This model will help to standardize the processes of assessing quality within the Lagos construction industry
Keywords: Building Contractors, Development, Lagos State, Nigeria, System, quality assessment
