Technology is the ultimate component for more sustainable buildings and better quality of life. Technology also changes our lifestyle and habits. Retrofitting of old buildings transform the spaces we live in; from a simple mixture from various construction materials to sophisticated high- performance machines thanks to the development and advancement in technology. One of the research domains for retrofitting is the building envelope and building facades as a subset of it. Increasing awareness towards energy conservation and reducing carbon emissions requires finding appropriate technological solutions in terms of facades which is a mediator for the ecological among external and. This energy conservation performance of the building can be drastically improved by contemporary façade technologies. Various design strategies are available for better façade performance which includes developments in the field of smart materials, better thermal insulation, power generation, vertical gardens and green infrastructure, selecting optimum mixture of solid and void areas, dynamic shading elements, biomimetic design approaches, light shelves, etc. The impact of the external environment is reduced by using static and mobile systems with great savings for energy expenses as well, A façade is providing appropriate natural ventilation, shading, and openings in hot locations. Meanwhile, It also allows the sun to shine as brightly as possible in colder climates. This adjustment ensures a perfect environment; The term "intelligent" facades refers to facades that change their aesthetic appearance. Three elements can be used to classify the comprehensive performances of intelligent façade device, energy consumption, visual comfort, and thermally comfort are the three key system utilities. Each of these utilities is defined as a function of the system's can be observed situation while adhering to a set of extra control variable requirements, The summation of these three utilities evaluated by user preferences is then used to create the cost function. The restricted nonlinear optimization problem arises when the cost function is minimized. The system's dynamics are highly nonlinear, and there are extra constraints on the control variables, Analytically solving this optimal control problem is tough. On the contrary, daylighting is frequently used to save electricity and may also improve visibility, The primary benefits of daylighting are untouchable the use of natural light in construction is influenced by a number of variables. These variables ae summarized in aesthetics, psychological response, health, energy and cost. In this research the detailing principles and the identification measures for smart facades a well as their main effects on office buildings, with reference to previous case studies and past projects located mainly in Saudi Arabia are elaborated.

Keywords : Smart façade, Smart materials, Saving energy, Technology solution