Introduction
Housing is one of the most essential needs for human have different issues. The issues in developing countries are of a limited nature due to existing housing shortages, population growth, immigration and economic constraints and mainly include developing countries.On the other hand, housing issues in developed countries are more of a qualitative and demographic and social structure.Considering the importance of providing appropriate housing especially for low income groups, various policies has been designed and implemented to solve these kinds of issues. In order to solve the problem of housing, especially for low income group in Iran, the policy of Mehr accommodation has been implemented. One of the main dimensions of this project is the level of residents' satisfaction. The present research question is whether residents are satisfied with the characteristics of the urban environment? Which indicators are more important in the quality of urban environment?
Materials and Methods
The present article is descriptive-analytical and data collection based on documentary and survey method and its results are practical and developmental. The nature of the research data is of a qualitative nature. By reviewing the literature, the indicators were compiled in four levels and were collected through a questionnaire. Statistical society was all households living in Mehr housing of Sabzevar. Due to the large volume of statistical population, Sampling was done and 340 families were estimated using Cochran method. Sample members also were selected by simple random sampling method, and finally the extracted data from the questionnaires analyzed with a single sample T-test and analysis of multiple regression and SPSS software.
Discussion and Results
The results of single sample T test for urban environment index equal to 2.7, which indicates satisfaction less than optimal (theoretical average 3) and for the indicator of the quality of the residential environment is 3.11, which indicates the relative satisfaction of inhabitants from the residential environment index. The average overall quality of the urban environment is equal to 2.62 and indicates the residents' dissatisfaction with the quality of the urban environment. Based on the results of multiple regressions in the skeleton and spatial variables, R2 for space and buildings sub-index is 0.94 and the quality of access to streets, public and green spaces is 89.0 and 91.0, respectively. On the variables of functional and structural criterion, quality of recreational services, social welfare services, business services and transportation services are 0.93, 0.93, 0.88 and 0.51, respectively.  Among the indicators below, the criterion of content properties also highlights the quality of people and social relationships with a value of 0.61 more variance. Skeleton-spatial and performance-structural characteristics describe quality of urban environment through values more than variance. Beta coefficient for performance-skeleton property is 0.735, therefore this property is more important than other sub-indices. Among sub-indices of residential environment, the size quality and of the building facilities index is 0.90 and this value is more than variance. Among sub-indices of residential environment, the cost quality of residential units is 0.834 and this is more important than other sub-indices. The results of the final analysis of multiple regression (the quality of the urban environment) which consists of the urban environment and residential area sub-indices shows that the urban environment sub-index represents more value in the quality variance of urban environment.  Also, urban environment with a beta coefficient of 1/140 is more important than the residential environment with a beta coefficient of 51.03.
Conclusions
According to the inhabitants' opinion, the satisfaction of the quality of the housing environment of Mehr housing city of Sabzevar, especially in structural-functional characteristics, is below the desirable level, which indicates its low quality; while the index of the quality of the environment shows a good level of living, but Inconsistency with the quality of the urban environment and the external environment of housing has led to a duality; therefore, more efforts are needed to improve the urban environment in order to improve the level of satisfaction of citizens.