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The looming global energy crisis of the 21st century is predicted to get even worse as building energy consumption is expected to rise by 50% by 2060. To combat this crisis, it is essential to invest in energy-efficient technologies and reduce carbon emissions. To this end, this paper delves into the complex issue of energy-efficient building practices in Nigerian households and how they can help curb the country's carbon emissions. Using a statistical method known as the Relative Importance Index (RII), we analyzed nine key factors that influence a building's energy efficiency. The research revealed that government oversight, support, and financial and technical assistance are crucial for achieving household energy efficiency. It also highlights the significance of addressing the energy crisis in Nigeria through the development, implementation, and adaptation of energy-efficient building practices.