This research aims to identify criteria for sustainable design solutions to meet the needs of Muslims today. Under the theoretical framework of Nikos Salingaros' Unified Architectural Theory, design needs and strategies derived from Islamic knowledge and values are identified and used to inform principles for building typologies, location, and movement between buildings. Green building technologies in line with Islamic values and examples of sustainability promoting policies are analyzed and used to further develop design strategies. The findings include a theoretical model that proposes the essential design criteria for appropriate architecture for the Muslim world. This research is relevant for architects designing for Muslims, who have a duty to create housing appropriate for their particular needs and cultural context.