This research project focuses on two distinct objectives: (1) recognizing construction knowledge in informal settlements—how construction decisions are made, including material selection, construction techniques, planning, and project management; and (2) developing alternative construction technologies with economic and ecological advantages that can be applied in these areas. The goal of the first research front is to gain a detailed understanding of the construction process of houses in informal settlements, particularly in the Tijolinho housing complex, located in the Nova Holanda Favela, in Maré. The study is based on the premise that any construction project, including those in informal settlements, follows a similar process: it is always preceded by some form of "design" and planning, followed by the acquisition of construction materials for the execution of the work (or a phase of it), and finally, the actual execution phase. All these steps are governed by informal agreements between the homeowner and the builder. A key aspect of the research is to understand who the builders in the favela are, how contracts between homeowners and builders are established, how the construction projects are materialized, and how dimensions, openings, and room layouts are defined. Additionally, the research seeks to explore how structural safety is considered, which factors influence material selection, who purchases the materials, how the construction schedule is organized, and whether construction techniques are the same as in the formal sector—or what innovative techniques are employed to overcome resource constraints. The research involves an immersive study in the target territory, engaging and interviewing key stakeholders in the construction process: residents, builders, construction material suppliers, and local agents. The findings contribute to discussions on how Technical Assistance in Social Housing can be expanded and made more effective. The second research front aims to assess the technical feasibility of construction solutions that can be applied to low-income housing to mitigate the problems faced by residents. The study focuses on so-called "eco-friendly" mortars, made from earth and recycled construction and demolition waste (RCD). It includes laboratory tests, evaluations, and environmental impact assessments, providing data to analyze the feasibility of using these mortars as coatings for ceramic block masonry, with the goal of improving Social Housing developments.