The trend towards environmental designs that contribute in reducing energy consumption and adapting to the environment is a major challenge for city planners, architects and all members of the community, so that most of the world is going to re-evaluate the current and future status of buildings and their suitability to the surrounding environment. Residential buildings in Najran are an important part of the city's built environment. The neglect of the environmental dimension in the design of the outer envelope of this type of buildings is the reason for increasing energy consumption and distortion of the visual image of buildings. The main reason for this is often incorrect decisions in handling the environmental and social aspects of this type of building. The study aims mainly at studying the design of the outer envelope of residential buildings in Najran city and its suitability to the surrounding environment in order to improve the internal environment of the residential spaces. This is done by assessing the outer envelope of these buildings environmentally and socially; to identify the most important problems faced, and to propose and evaluate treatments; to come up with a number of recommendations that will help the designer in making future decisions; in addition to providing treatments that improve the status. To achieve a better residential environment and the impact of compatibility with the environment in which they are located; Using the analytical approach and field visits through which the current situation is analyzed and evaluated