Abstract: Urban housing has been always depended on population and the tendency to take benefit of these houses has been increased over the years. Moreover, increased tendency for urbanization in metropolises, especially Tehran has led to increased demand for affordable housing. Accordingly, over the years, some projects have been switched over the years in Iran under the title of Mehr Housing with the aim of providing house for low-income classes in majority of Iranian cities and have been developed rapidly. Although, the construction of these projects had fast process at the first and the demand for these houses was increasing day by day, it lasted no long time that because of undesirable quality of architecture in these projects, their popularity was decreased rapidly. Lack of stability of textures and lack of harmony of housing design with desirable architecture intense insufficiency of facilities, weakness of planning and lack of suitable infrastructures and many other undesirable conditions of architectural design in these projects could be the main problems with those projects. Construction of affordable houses in the cities instead of marginal areas is another option without problems of projects such as Mehr Housing. In fact, social housing is an option against Mmehr Housing and the most important difference between them is location of these houses inside the limit of cities, especially, worn textures. Interference in old urban textures across the different countries of the world has a history of several hundred years. In Iran because of existence of cities with old texture, this action is being taken in modern form since, a few decades ago. Till now, across the world and in Iran, various models and methods are used for purpose of influence in urban worn textures. Decline of qualitative indices in urban spaces of worn textures is one of the main problems with these urban areas and as urban spaces show the peak of location manifestation of urban life and presence of citizens, the mutual effect of decline of quality of urban spaces on decline of quality of urban life could clear depth and dimensions of the problem in worn textures on the other hand, the best way to construct affordable houses is use of industrial methods instead of traditional methods. The main objective of this study is to provide an approach to design social houses in worn textures (no-historical textures) of Tehran using precast systems (with the capability of production in Iran) at the first, the qualitative concepts of housing are explained and then, a history of construction of affordable houses at the world and in Iran is introduced. Afterwards, the importance of housing industrialization and introduction of precast system with the implementation capability in Iran is discussed. At the end, the studied area is introduced.