Green buildings (GB) have emerged as an effective strategy for mitigating environ-mental degradation, reducing resource depletion, and combating climate change linked to rapid urbanization. Due to the accelerating pace of urban growth in Nigeria and the demand for increased infrastructure, there is a growing need to incorporate GB principles into sustainable urban planning. In this study, Nigerian GB Policy Frameworks (GBPFs) are reviewed and analysed in terms of their degree of integration into sustainable urban planning. A narrative literature review with systematic elements was conducted using secondary data, including policy documents and international GB standards from 2000 to 2026. The review focused on four primary Nigerian policy documents (the National Building Code (NBC), National Housing Policy (NHP), Energy Efficiency Building Code (EEBC) and the Green Building Council of Nigeria (GBCN) and provided a comparative analysis between the Nigerian GBPFs and the international frameworks—Leadership in Energy and Environmental Design (LEED), Building Research Establishment Environmental Assessment Methodology (BREEAM), Green Star SA, and Green Mark etc. The findings indicate progress in GB construction practices in Nigeria; however, the existing GB policies (GBPs) in Nigeria are largely fragmented, poorly enforced, and poorly integrated into urban planning processes. Institutional overlaps, lack of adequate financial resources, lack of technical capacity, lack of stakeholder engagement, and the absence of a nationally sanctioned GB rating system present ongoing barriers to implementation. The comparative analysis indicates that countries that have implemented stronger regulatory frameworks, greater financial incentives, and introduced compulsory certification systems achieve greater success in the integration of GB principles into urban development. The study advocates a legally binding national GB framework that would provide for improved institutional coordination, the provision of financial incentives, the establishment of climate-responsive standards, and robust monitoring mechanisms to support sustainable urban development in Nigeria.