Application of Defensible Space Theory in a Nigerian Secondary School: Faith Academy, Ota

2.1 Defensible Space Theory: Origins and core principles

The concept of defensible space was formally introduced by Newman [7] following his seminal study of housing projects in New York City. Newman observed that crime rates were significantly higher in high-rise, anonymous public housing complexes compared to low-rise developments. He attributed this disparity to the weakened sense of ownership and control residents felt over shared, ill-defined spaces in larger complexes [7]. From these observations, he defined defensible space as a residential environment whose physical characteristics, specifically building layout and site plan, function to allow inhabitants themselves to become the key agents in ensuring their own security [7]. The theory is fundamentally rooted in the premise that the physical design of an environment can influence human behaviour and reduce crime by fostering a sense of ownership and encouraging natural surveillance.

While Newman's work originated in a residential context, the principles of DST have proven to be highly adaptable and have been integrated into the broader field of CPTED. CPTED provides a multi-disciplinary approach for designing safer environments across various building types, including schools [12, 13]. The core argument is that a well-designed environment can reduce the opportunity for crime and mitigate the fear of crime without relying exclusively on formal policing. Recent studies continue to validate this approach, demonstrating its effectiveness in various contexts, including educational settings in both developed and developing countries [13, 16].

2.2 The four pillars of defensible space

This study adopts Newman's original framework, analysing the built environment through four interconnected elements: territoriality, natural surveillance, image, and milieu.

2.2.1 Territoriality

Research on territoriality in defensible space focuses on the design's ability to create a sphere of influence and sense of ownership among legitimate users, thereby discouraging intrusion by outsiders [7]. Physical markers such as fences, gates, signage, and landscaping are used to define boundaries between public, semi-public, and private spaces [17, 18]. In a school context, a clear territorial definition helps students and staff identify strangers and reinforces their authority over the environment. Research has shown that when users feel a sense of ownership, they are more likely to challenge intruders and report suspicious activities [19]. The quality of the learning environment also plays a crucial role in shaping student motivation and self-discipline [20], which may indicate that territoriality extend beyond physical feature that foster a sense of ownership among student. The permanent display of student artwork, for instance, has been significantly associated with a greater sense of ownership among students, making spaces feel more defended [19, 21]. A recent study in the Nigerian context affirmed that territorial reinforcement through clear spatial definition and access control is a critical, though often underutilised, strategy for enhancing security in educational facilities [22, 23].

2.2.2 Natural surveillance

Research on natural surveillance in defensible space examines the capacity of the physical environment to provide opportunities for users to observe their surroundings casually and continuously. This concept is often linked to Jacobs's notion [24] of "eyes on the street," where the natural movement and presence of people provide informal oversight. In architectural terms, this is achieved by maximising visibility through strategic placement of windows, minimising blind spots, using open landscaping, and ensuring adequate lighting [25]. When a school is designed for good natural surveillance, students and staff can easily monitor corridors, courtyards, and playgrounds, which deters potential offenders who fear being observed. However, the effectiveness of this design depends on user awareness, as safety in Nigerian schools can be influenced by how well student and staff understand and engage with existing security measures [26]. Contemporary research emphasises that the effectiveness of natural surveillance is not merely about the number of windows, but about the strategic management of sightlines to ensure continuous oversight of key areas, a principle that holds in the design of modern school buildings [27].

2.2.3 Image

Research on image in defensible space pertains to a place's overall appearance and the perception it projects to both insiders and outsiders. According to Newman [7], a poorly maintained environment with signs of physical deterioration, such as broken windows, graffiti, and litter, can signal neglect and a lack of care, making it more vulnerable to crime and vandalism. Conversely, a well-maintained and aesthetically pleasing environment projects a sense of order and control, deterring criminal activity. In schools, a positive image fosters pride among students and staff, encouraging them to protect and care for their environment, which in turn reinforces territoriality and natural surveillance. The Broken Windows theory, which aligns with this element, continues to find support in environmental criminology, with recent studies linking the perception of neglect to increased fear of crime and defensive behaviours among students [28, 29].

2.2.4 Milieu

Research on milieu in defensible space refers to the location of a property within its surrounding context and how the characteristics of that area influence security [7]. This includes the proximity to other secure or active facilities, such as police stations or bustling commercial areas, as well as the quality of the immediate infrastructure, such as roads and street lighting. A school located in an area with poor road infrastructure or perceived as crime-prone faces additional security challenges, regardless of its internal design [30]. A supportive milieu can enhance security, while a negative one can undermine even the best defensible space design within the school's boundaries. The importance of this external context is increasingly recognised in safe school planning, with recent frameworks advocating for a holistic approach that integrates the school with its surrounding neighbourhood to create a cohesive and secure educational landscape [31].

2.3 Application in school design: Current guidelines and research

The application of defensible space and CPTED principles in educational settings has gained traction globally. Studies have led to the development of structured design guidelines that translate theory into practical strategies for architects and schools [32, 33]. These guidelines typically advocate for a multi-layered approach encompassing site design, building architecture, interior spaces, and maintenance protocols.

However, empirical research applying the integrated four-element defensible space framework to secondary schools in Nigeria remains sparse. While prior studies have examined isolated aspects such as infrastructure conditions [14] or perceptions of landscape elements [15], a critical knowledge gap persists. Specifically, there is a lack of holistic, mixed-methods studies that simultaneously: (a) evaluate the physical presence of all four DST pillars (territoriality, natural surveillance, image, milieu), and (b) investigate how these features are perceived by the primary users (students) in the Nigerian secondary school context [34, 35]. This study aims to fill this gap by employing Newman's comprehensive framework in a convergent parallel assessment of Faith Academy, thereby linking architectural audit with user experience.

2.4 Conceptual framework

This research is guided by the conceptual framework illustrated in Figure 1. The study posits that the application of the four defensible space elements (Territoriality, Natural Surveillance, Image, and Milieu) in the school's design directly influences the perceived and actual security of the environment. These elements are investigated through two primary data sources: 1) the perceptions of the primary users (students), captured via surveys, and 2) direct physical observation of the school's grounds, exterior, and interior. The integration of these data sources provides an overall evaluation of how defensible space principles are implemented and experienced in a real-world Nigerian secondary school context.

This section presents and discusses the findings from both the student surveys and physical observations, organised around the four elements of DST. This integrated approach provides a comprehensive understanding of how the theory's principles are manifested and perceived within Faith Academy.

4.1 Territoriality: Defined boundaries and perceived ownership

The assessment of territoriality revealed a complex interplay between well-defined physical boundaries and a moderate sense of psychological ownership among students.

Survey Results: As shown in Table 3, a strong majority of students (62.7%) agreed that private and public spaces were clearly demarcated, and a similar proportion (62.7%) confirmed that spaces were adequately labelled, facilitating wayfinding. Furthermore, 57.9% of respondents agreed that access to spaces was regulated. However, only 27.8% of students reported feeling a sense of ownership over school spaces, indicating a significant opportunity to strengthen psychological territoriality.

Table 3. Student perceptions of territoriality (n = 126)

Figure 3. Perimeter fence and controlled gatehouse at Faith Academy

Note: Photograph from the authors’ fieldwork shows a clear physical boundary and access control point, reinforcing territoriality, 2024.

Observational Findings: Physical observations confirmed the presence of strong territorial markers. The school grounds are enclosed by a perimeter fence with controlled entry points (see Figure 3). Pedestrian routes are clearly marked and separated from vehicular traffic, and recreational areas like the football field are well-fenced. The main entrance is architecturally emphasised with signage and landscaping, reinforcing the transition from public to private space.

Integrated Discussion: At Faith Academy, the disconnect between well-defined physical boundaries and a moderate sense of psychological ownership presents a site-specific instance of a broader phenomenon noted in defensible space literature: that physical demarcation alone is insufficient to foster territoriality [22, 23]. In this case, while the school successfully establishes physical territoriality through fences and signage, the lower sense of ownership appears linked to the standardised classroom layouts with minimal opportunities for student personalisation (as illustrated in Figure 4). This case study finding suggests a transferable implication for school design more generally: to achieve true defensibility, architectural strategies must be coupled with opportunities for user personalisation. Research consistently indicates that interventions like permanent displays of student artwork can significantly enhance the sense of ownership and defensive attitudes [19, 21], a principle applicable beyond this single case.

Figure 4. Standardised classroom layout at Faith Academy

Note: The image shows the standardised classroom layouts with minimal to no potential for student personalisation. (Source: School administration records, 2024) [46].

4.2 Natural surveillance: Strategic design and behavioral response

The study found that the school's design effectively facilitates natural surveillance, and students demonstrate awareness of this feature.

Survey Results: Table 4 indicates that 52.4% of students agreed they could see external surroundings from inside buildings, and 52.3% stated they would inspect their surroundings upon hearing suspicious noises. This suggests that the architectural design not only provides the opportunity for surveillance but also encourages vigilant behavior among users.

Table 4. Student perceptions of natural surveillance (n = 126)

Figure 5. Strategic window placement for natural surveillance

Note: Photograph from the authors’ fieldwork showing classroom windows positioned to provide clear sightlines to outdoor spaces, enabling casual monitoring, 2024.

Observational Findings: The observational data confirmed these perceptions. The fencing around the site allows visual penetration, and key areas like parking lots and pedestrian walkways are within the sightlines of classrooms and administrative offices (see Figure 5). The interior design features two courtyards with classrooms arranged around them, promoting cross-visibility. Corridors and staircases are positioned to be easily monitored, and the staff room is located near the main entrance for oversight.

Integrated Discussion: At Faith Academy, the alignment between the physical environment and user perception reflects the successful application of natural surveillance principles. The strategic placement of windows and open planning minimises blind spots, which is a cornerstone of effective CPTED [12, 13]. This case study finding suggests a transferable implication for school design more generally: the effectiveness of natural surveillance depends not merely on the number of windows, but on strategic management of sightlines to ensure continuous oversight of key areas [27]. The fact that over half of the students reported a willingness to act on what they see or hear is particularly significant. This aligns with prior studies, which show that when environments facilitate observation, they empower users to become key agents in their own security, fulfilling a core tenet of DST [7]. This principle, demonstrated at Faith Academy, has broad applicability for creating actively defended educational spaces beyond this single context.

4.3 Image and Milieu: Maintenance, perception, and contextual challenges

The elements of Image and Milieu presented the most significant challenges, with dissatisfaction centred on maintenance and external infrastructure.

Survey Results: As presented in Table 5, perceptions of the school's image were mixed. While 53.1% of respondents disagreed that the school had physical deterioration, a notable 48.4% were dissatisfied with the general cleanliness of the environment. Regarding milieu, although 51.6% disagreed that the school was in a crime-prone area, an overwhelming 55.6% indicated that the roads surrounding the school were not well constructed.

Table 5. Student perceptions of image and milieu (n = 126)

Observational Findings: Observations largely supported the positive aspects of the school's image, noting well-maintained buildings with little to no vandalism and trimmed vegetation. However, the poor condition of the access roads, specifically Ota Road, was visibly evident and constituted a significant negative aspect of the school's milieu.

Integrated Discussion: At Faith Academy, dissatisfaction with cleanliness despite the overall lack of vandalism presents a site-specific illustration of the nuanced nature of "image." It suggests that for these students, daily maintenance routines are as important as the absence of major damage. This finding underscores a broader principle in environmental criminology: that minor signs of disorder, like litter, can signal a lack of care and potentially lead to more serious issues, as posited by the Broken Windows theory [28, 29]. Similarly, the poor state of the surrounding roads at Faith Academy represents a critical, context-dependent milieu factor that not only affects accessibility but may also subconsciously signal isolation and poor connectivity. This case study finding reinforces a transferable implication for school safety planning: that a school's security is inextricably linked to the quality and safety of its immediate external environment [30, 31]. Therefore, a holistic approach to school safety must extend beyond the school's perimeter, a principle applicable to educational facilities in similar contexts.

4.4 Overall perception of safety

Despite the identified concerns, the overall perception of safety within the school was positive. As shown in Table 6, 49.3% of students felt safe within the school grounds, and a strong majority (64.3%) expressed general satisfaction with the level of security. This indicates that the application of defensible space principles, even with its imperfections, contributes to a generally secure environment.

A preliminary subgroup analysis was conducted to explore variations in overall safety perception. An independent samples t-test comparing safety satisfaction between male (Mean (M) = 3.25, Standard deviation (SD) = 1.05) and female (M = 3.13, SD = 1.11) students revealed no statistically significant difference (t-statistic (124) = 0.63, p-value = 0.53). Similarly, a one-way Analysis of Variance (ANOVA) examining differences across the three class levels (SSS1, SSS2, SSS3) showed no significant variation in feelings of safety within the school (F-statistic (2,123) = 0.05, p-value = 0.95). These results indicate that perceptions of safety and security were consistent across gender and class level subgroups within the sample.