Urban construction plays an important role in Ghana’s development, but it also contributes to environmental problems such as high energy use, waste generation, and resource depletion. This study examined the managerial capacity needs of built environment professionals for delivering environmentally sustainable buildings in urban projects in Ghana. A quantitative survey design was used, and a structured questionnaire was administered to 100 architects, engineers, quantity surveyors, and project managers in the Greater Accra and Ashanti regions. The data were analysed using factor analysis in SPSS, with reliability testing to confirm the consistency of the instrument. The findings showed that managerial capacity needs are grouped into four main areas: individual, organisational, industry, and state-level needs. At the individual level, stakeholder engagement, risk management, and environmental knowledge were identified as key skills. At the organisational level, firms need stronger strategies, supervision, and quality control systems. At the industry level, certification, training, and knowledge-sharing platforms were important, while at the state level, respondents highlighted the need for better regulation, streamlined permitting, and government-led training. The study concludes that improving managerial capacity is essential for mainstreaming environmentally sustainable buildings in Ghana. Strengthening training, organisational systems, industry standards, and public policy will help support a more sustainable construction sector.