Egypt is considered as one of the most important countries that contain many valuable heritage
buildings. Most of these buildings suffer from neglect, deterioration, lack of investment and
maintenance. That reflected itself on the deterioration of building`s architectural situation. These
buildings lost their cultural, economic, and social significance over time. This needs the intervention
of research to find solutions for restoration of buildings of historical value that enable their reuse in
the appropriate context. Green architecture is a widespread trend in the last two decades. Principles
of green buildings have to be considered when restoring historically valuable buildings in order to
achieve sustainable green heritage areas. This research aims to accomplish heritage building's
complete sustainability through the incorporation of green architecture principles into the process of
restoration of historically valuable buildings. This can, of course, means meeting the needs of new
generations without risking the loss of heritage buildings` value.
The methodology of this research includes; first the theoretical part that includes definitions of
heritage, green buildings, policies, principles, and types of restoration projects. In its analytical part,
the research presents an international model of transforming a heritage building into a green building.
The applied case study then presents a number of recommendations for restoration of Mansoura opera
house as one of the most significant heritage buildings in the city of study while considering green
and sustainability criteria.