From invasion to symbiosis: a morphological analysis of domesticated parasitism in incremental housing

The escalating housing crisis and the uncontrolled proliferation of informal settlements in the Global South challenge the modernist ideal of the completed architectural object. While 'Parasitic Architecture' is conventionally coded as an act of illegal occupation, 'Incremental Housing' strategies propose a controlled evolution; however, a theoretical gap exists in defining the morphological mechanics where these two concepts intersect. This study aims to bridge this gap by proposing the concept of 'Domesticated Parasitism'. Adopting an instrumental case study model, the research analyzes the morphological evolution of the Quinta Monroy housing complex in Chile. To mitigate interpretive bias and ensure analytical objectivity, the visual reading follows a structured coding protocol that categorizes the intervention zones into three distinct layers: (1) Fixed Structural Matrix, (2) Defined Expansion Zones, and (3) User-Generated Infill. Findings from the diachronic analysis comparing the initial state with current saturation levels reveal that the host structure functions as a 'spatial cage' that disciplines the growth of user additions. Unlike uncontrolled urban sprawl, the visual evidence confirms that the parasitic additions strictly adhere to the vertical void geometry defined by the architect. The research concludes that the architect's role transforms from an author of static forms to an enabler, positioning domesticated parasitism as a sustainable spatial grammar for urban densification.