The transition to sustainable construction is essential for reducing carbon emissions, improving energy efficiency, and mitigating climate change. Green building (GB) technologies offer significant environmental and economic benefits but face challenges such as high initial investment costs and limited financing options. This study assesses the economic viability of integrating green building technologies into commercial buildings in Nigeria, focusing on renewable energy solutions such as solar power and their impact on investment costs, operational savings, and long-term financial returns. Utilizing a mixed-methods approach, statistical analysis indicates that although green technologies require substantial upfront capital, they provide significant lifecycle benefits, including reduced energy expenses and enhanced building performance. Key barriers to adoption include financial constraints, limited awareness, and inadequate regulatory frameworks. The findings emphasize the need for financial incentives, increased stakeholder education, and stronger policy support to promote the widespread adoption of sustainable construction practices. This study contributes to the advancement of green building implementation, addressing economic and environmental challenges in Nigeria’s commercial construction sector.