Like in many of India’s fast-urbanizing regions, illegal foothill communities in Visakhapatnam provide serious obstacles to environmentally conscious urban development and sustainable urban planning. Due to several socioeconomic circumstances, these communities have grown over time and have encroached on ecologically vulnerable areas near the Eastern Ghats’ foothills. The problem is made worse by inadequate urban planning, lax enforcement of laws, and denial of basic amenities, which makes people more susceptible to disasters and causes the devastation of natural habitats. The study delves into detailed research and understanding of illegal foothill settlements in Visakhapatnam by conducting a comprehensive analysis across multiple dimensions of the selected case study areas. The methodology includes the study of the evolution and characteristics of illegal foothill settlements in Visakhapatnam’s core areas near Hanumanthuwaka and Arilova. Four specific case studies were selected to delve into various aspects of these settlements, aiming to uncover demographic patterns, socioeconomic conditions, housing typologies, and influence of development control regulations, policies, programs, and schemes. Primary and secondary data were collected from key municipal and regional authorities such as GVMC, VMRDA, and APTIDCO. This data collection facilitated a detailed examination of land-use patterns, the legal and organizational frameworks shaping these settlements. The study emphasizes a multidimensional approach, considering ecological perspectives, disaster management, and social and physical infrastructure implications. By synthesizing findings from these diverse perspectives, the study aims to identify causes, effects, key challenges, and potentials inherent in foothill settlements. Based on these insights, recommendations are formulated to address existing issues and prevent future encroachments, ensuring the sustainable development and protection of foothill areas across Visakhapatnam. This approach seeks to provide actionable recommendations grounded in the realities and complexities observed in the evolution and management of illegal foothill settlements in the city. The study thus tries to provide insights and recommendations for policymakers, urban planners, and stakeholders involved in sustainable urban development and environmental conservation efforts in similar contexts globally. Resilient and equitable urban landscapes that strike a balance between meeting human needs and protecting the environment for future generations by looking at these challenges as their whole are thus created.