One of the most important problems for governments and private sectors on construction industry is how to allocate budgets for public residential projects. Low-income residential projects in developing countries have major effects on implementing the principles of sustainable development. Limited budgets in concrete rehabilitation structures represent challenges for the decision-makers. The budget allocation methods proposed in this paper can be easily meet the actual changing demands of response budget policies. This paper proposed a comprehensive comparison between the Topsis method and Simo's ranking method in low-income residential rehabilitation projects. Also, the assignment problem presented to select a suitable project depending on the different clusters. This proposed comparative study aims the decision-maker (DM) to select the optimum method. Finally 13 criteria have been gathered from comprehensive literature. The gathered criteria have been reviewed through unstructured interviews with engineers work in the required field, and selective research according to the designed sample size. These criteria have been classified into three main clusters, economic aspects cluster, social aspects cluster, and environmental aspects cluster. Statistical analysis has been conducted on the interviews feedback. The research aims to trade-off in guiding the decision-maker to direct very limited budgets in the quality of restoration and rehabilitation the efficiency of low-cost or economic housing projects sustainably based on cost factors of projects.