The study introduces new techniques of applying sustainable smart materials on existing buildings which will give them the ability to adapt passively with the surrounding environment and climate, reach the comfort zone inside the buildings automatically without occupants' interference. This research will present guidelines on way of using smart materials, assembling them in various geometrical composites, and how to apply them on the exterior building envelope, to reach optimum level of comfort without human interference.  This prolific scientific thinking offers a specific procedure to use smart materials in building external envelope in hot climate and this by its turn will enhance temperature, lighting, and other comfort factors inside the building to reach the comfort range, and it will also decrease building economics and energy consumption as well. The research closes with the synthesis of the preliminary guide lines that will help architects to enhance existing building to become smarter or/and make a new building from the very beginning with these intelligent materials. Conclusion were educed according to analytical study of international case studies. International case studies have a lot of smart aspect for building façade that was evaluated according research new model. Local proposal was implemented and analyzed in a way to apply this smart material on it and what is the main effect of applying these smart new materials on existing material. KEYWORDS: Smart materials, building façade, adaptive façade, responsive façade, Self-cleaning material, Phase change material (PCM), advanced geometries, Materialism, Property changing material, energy exchanging material, Shape morphing materials.