The devastating impacts of climate change in urban areas of developing countries, such as the Owerri urban area, have scarcely been addressed methodically. This oversight has persisted, even though it has taken less than a decade to achieve the Sustainable Development Goals (SDGs) by 2030. Therefore, this study investigated the increasing sensitisation and integration of green spaces (GS) into urban environments using climate-responsive architectural practices (CRAPs) to achieve SDG 13. This study adopted a qualitative research technique, using a questionnaire to survey practising architects in Owerri, Nigeria. The researchers analysed the data collected thematically. The results revealed that public and private residential and commercial building premises in Owerri metropolis were either bare or paved surfaces with scant greenery, with no specific policy for incorporating green spaces in architectural designs. The lack of greenery affects the city’s environmental air quality. The economic, social, and ecological significance of GS would motivate policymakers, stakeholders, and environmental practitioners to recognise and address the processes of incorporating GS and CRAPs. The integration will enhance the city’s and its residents’ health and comfort. This study expanded the research frontiers on green spaces and CRAPs and increased their databases.