The increased cost of applying health, safety, and environmental standards to sustainable projects, as compared to traditional projects, causes project owners and contractors considerable concern because it reduces profits. The objective of the study is to identify the most significant factors that contribute to the increasing cost of sustainable projects. The study assesses the factors that increase the cost of implementing health, safety, and environmental management standards in sustainable construction projects as compared to traditional projects. Toward this end, a field survey was conducted on a sample of 53 selected projects in a specific geographical area with a high intensity of construction work. Data was collected using structured questionnaires and analyzed using a tabulated presentation that determined the percentages of responses given. The study's findings indicate that selecting HSE managers with more experience, increasing scaffolding security and specialized training and using more personal protection equipment in sustainable projects are some of the most significant variables causing cost increases. The findings show that improved HSE regulations are needed for the Egyptian construction sector, especially in traditional projects. To attain cost effectiveness, HSE issues must be recognized and integrated early in the project cycle. On sustainable Egyptian projects, the client, consultant, and contractor must collaborate to enhance health, safety, and the environment.