Efforts to minimize the negative impact of the built environment include the development of green buildings. However, the low level of awareness of green building requirements has been a major barrier to its adoption. Hence, the study sets to determine if there were variations in the level of awareness of the requirements for green building development among the Built-Environment professionals through a cross-sectional survey. The LEED v4 Project checklist for New Construction and Renovation was adapted on a five points Likert’s scale for data collection from 69 Built-Environment professionals in the Physical Planning Units of Federal Universities and Polytechnics in South-West Nigeria. The Kruskal Wallis Rank sum Test showed a significant variation in the level of awareness among the professionals thereby rejecting the null hypothesis. The Least Square Difference (LSD) used for the Post-Hoc assessment indicated the degree of variation in the level of awareness from one professional to the other. The significant variation identified in the level of awareness of the requirements among the professionals poses a challenge to the implementation of the requirements for green building development. It would therefore be difficult to achieve the integration required for green building development among the built industry professionals. Training and education were recommended for the professionals to develop requisite skills for green building development.