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The Effect of Building Encroachment on Neighbourhood Environmental Quality

Abstract

Building encroachment is a growing challenge in urban and residential areas where buildings or other structures extend into spaces intended for roads, setbacks, drainage corridors, pedestrian routes, open spaces, or neighbouring properties. Such development can alter the planned spatial structure of neighbourhoods and place pressure on existing infrastructure and environmental resources. Encroachment may reduce the availability of open space, restrict movement, affect ventilation and daylight, and contribute to a decline in the overall quality of the built environment. This study examines the effect of building encroachment on neighbourhood environmental quality. It focuses on how unauthorized or poorly controlled building extensions influence spatial openness, accessibility, natural ventilation, daylighting, drainage, vegetation, visual quality, and general neighbourhood functionality. The study also considers the relationship between building encroachment and residents' perceptions of environmental comfort, safety, privacy, and satisfaction. Particular attention is given to the cumulative effects of individual encroachments on the wider neighbourhood environment. Encroachment into setbacks and circulation areas can reduce the amount of space available for pedestrian movement, landscaping, parking, and essential infrastructure. Structures built too close to roads or neighbouring properties may create restricted pathways and reduce the openness of streets and residential compounds. The reduction of setbacks can also limit airflow and daylight penetration between buildings, potentially affecting indoor and outdoor environmental conditions. These spatial changes can gradually transform the character and functionality of established neighbourhoods. Building encroachment may also contribute to environmental problems related to drainage and waste management. The occupation of drainage reserves or open areas can obstruct stormwater flow and increase the risk of localized flooding during heavy rainfall. Encroachment may similarly reduce spaces available for vegetation, waste collection, utility access, and other neighbourhood services. These effects demonstrate that uncontrolled development can have consequences extending beyond individual properties to the environmental performance and resilience of entire neighbourhoods. The study further considers the social, regulatory, and management factors that contribute to building encroachment. Weak development control, inadequate monitoring, population growth, land pressure, limited awareness of planning requirements, and increasing demand for additional building space may encourage unauthorized development. Differences in enforcement and land-use practices can also influence the extent of encroachment within different neighbourhoods. Effective management therefore requires appropriate planning regulations, consistent monitoring, public awareness, and coordination between property owners and relevant authorities. The study aims to assess the relationship between building encroachment and neighbourhood environmental quality and to identify strategies for managing its negative effects. It is expected to contribute to improved understanding of how uncontrolled building extensions influence environmental conditions, infrastructure, spatial functionality, and residents' quality of life. The findings can provide useful guidance for architects, urban planners, development-control authorities, property owners, and community stakeholders in promoting orderly development and maintaining healthier, more functional, and environmentally responsive neighbourhoods.

Keywords: Building encroachment, Neighbourhood environmental quality, Urban development, Development control, Setbacks, Spatial planning, Residential areas, Environmental quality, Urban infrastructure, Natural ventilation, Daylighting, Drainage, Land-use management, Neighbourhood planning.