A project proposal for the fishing community living in cramped living conditions in Mahim, Mumbai. A strategy of incremental mass housing for the low-income group fishermen in Mahim called the ‘koliwadas’ where the module of the housing scheme was designed and construction technology used were low cost and using the structural grid pattern for its planning, sustainable techniques, and materials used for construction. The major problem of encroachment in such housing typologies made very cramped living conditions as the family expands in size, leads to encroachment of inhabitable spaces. The idea of having an incremental type of housing such that the modules and the layout is designed using strategies of expandable and convertible incremental house modules. Where a 45 sq. m module can be converted to a 60 sq. m, a module of 60 sq. m becomes 90 sq. m, and 90 sq. m becomes 120 sq. m.