Due to the importance of this issue, the following research question will be answered in this study. How do people in residential neighborhoods in the UAE perceive sustainability principles? Thus, this paper aims to measure the perception of sustainability in the UAE residential sector. To achieve this aim, this paper intends to (i) develop an understanding of the progress in sustainability concepts, (ii) identify the main dimensions/indicators based on related literature studies, green rating assessment tools, and experts in the field, (iii) collect data from occupants of residential buildings in the UAE based on the adopted sustainability indicators, and (iv) test the proposed hypotheses and draw conclusions. The hypotheses are for testing the correlation among the three pillars of sustainability, as well as the positive impact of each pillar on the perception of sustainability by occupants in the residential sector in the UAE.
The review of the literature is drawn from several relevant sources. First, it investigates green building rating systems, then it focuses on awareness and perceptions of SD in the UAE. Subsequently, it highlights the link between awareness and behavior, and finally, it investigates the related sustainability indicators in the context of the UAE residential sector. The following subsections elaborate on each component of the literature review.
1.2. Sustainable Development in the UAE
The UAE has been one of the pioneering countries in considering sustainability as a serious issue that concerns the future of the country. Several landmark projects are supporting the movement to a more sustainable and livable future. This is achieved by focusing on the Sustainable Development Goals (SDGs), which consist of 17 interconnected goals to attain a better and more sustainable future for all [
19]. Consequently, the UAE has put in place several initiatives to drive the country to a more resilient and sustainable future by enabling ways to health care, sufficient and affordable food, economic growth, quality education, a healthy environment, and efficient use of resources [
20]. To illustrate, the UAE energy strategy targets increasing the share of clean energy resources by 50%, increasing consumption efficiency by 40%, and reducing its carbon footprint by 70% by 2050 through the implementation of several initiatives across the country [
21].
The main initiatives toward SD in the UAE include: (i) ESTIDAMA Pearl Rating System (PRS), which was established in 2009 by Abu Dhabi government to be one of the leading sustainability frameworks in the Middle East, where all the developments are required to meet at least the minimum number of pearls based on this sustainability rating system [
22], (ii) Al Sa’fat initiative, which replaced Dubai Green Building Regulations and Specifications in 2020; it includes a comprehensive set of requirements for all new developments to secure a more sustainable environment in the future [
23], (iii) Masdar City—Abu Dhabi, which was initiated in 2006 to help implement sustainability practices in an urban development [
24], (iv) Sustainable City—Dubai, which was established in 2015 to focus on the three dimensions of sustainability by implementing sustainability practices that improve the occupants’ lifestyle [
25], (v) Sharjah Sustainable City, which was established in 2021 as a continuation of the sustainability success of the Sustainable City—Dubai [
26], (vi) EXPO2020, which is designed, built, and operated in a sustainable manner that makes it one of the most energy efficient development [
27], (vii) Mohammad Bin Rashid Al Maktoum Solar Park, which is anticipated to reduce the carbon emission in the UAE by 6.5 million tons per year [
28], and other governmental initiatives that support sustainable development goals (SDGs), such as Al Jalila foundation, Dubai cares, food bank, Dubai cares water, sanitation, and hygiene, international humanitarian city, Mohamed Bin Rashid Al Maktoum Global Initiative, Noor Dubai foundation, sustainable schools, UAE water aid initiatives, and the Zayed Bin Sultan Al Nahyan charitable and humanitarian foundation [
29]. As per the SD report of 2021, the UAE has an overall score of 70.17% in achieving the 17 SDGs [
30]. In addition, according to Asif [
31], the UAE is leading the sustainability trends among the GCC countries, also having the highest share of green buildings in the whole Middle East and North Africa (MENA) region.
According to [
32], residential buildings are among the essential community conditions that describe the healthy quality of life and well-being of people. In addition, residential buildings consume about 40% of the world’s electricity and account for up to one-third of global greenhouse gas emissions in developed and emerging economies [
33]. In the UAE, the residential sector has seen a remarkable increase in electricity consumption–the consumption has increased from 6580 GWh to 12,795 GWh from 2006 to 2017 [
34]. Therefore, it is apparent that special attention should be given to this sector to enhance the overall sustainability of the three sustainability pillars.
1.3. The Link between Awareness and Behavior
Awareness of environmental problems has grown in the second half of the twentieth century [
35]. In addition to environmental problems, human society has also undergone dynamic changes due to advances in communication, technology, and globalization. The social structure and economic conditions of the current world have led to an increase in global inequality and polarization in society. Understanding the integration of environmental, social, and economic aspects of human and natural systems has become crucial [
36]. Consequently, people need to understand how their activities impact the environment, including social and economic aspects, and what they can do to minimize the adverse impacts [
37,
38]. This position claims that increasing people’s awareness of sustainability within their communities can encourage them to implement sustainability principles and practices in their day-to-day activities. Several related terms are often used interchangeably with sustainability awareness; these include green awareness, environmental awareness, environmental knowledge, carbon literacy, energy literacy, environmental literacy, and ecological literacy [
39].
A review of current literature reveals that considerable attention is devoted to sustainability in general and environmental sustainability in particular, which some authors describe as having an enviro-centric view [
40,
41,
42]. Vasconcelos [
43] argues that “for too many people the word environment still signals ‘green’ and fails to convey its social, economic, political, and cultural components”. Research into awareness, perceptions, and behavior in terms of sustainability in the residential sector is limited, but there is more evidence that behavior is built on perceptions and attitudes when addressing energy saving and recycling, energy efficiency, and climate change [
44,
45,
46]. Environmental behavior remains the most widely and systematically studied subject within the existing socio-psychological literature [
47,
48,
49].
Several studies have been conducted to develop strategies aimed at enhancing people’s awareness, perceptions, cognitive abilities, motivations, and behaviors to promote household sustainable practices. For instance, a study conducted by [
50] in 2008 showed that there is a problem with people’s perceptions and behaviors when using sustainable energy and water technologies. Later, in 2010, a need for further research was identified by [
51] in the area of users’ perceptions, behaviors, attitudes, and expectations for sustainable measures. Previous studies have shown that building occupants play a critical role in the built environment, as 50% of energy consumption in residential buildings depends on the behavior of buildings occupants [
52].
Moreover, an investigation conducted by [
53] suggested that energy-efficiency behaviors account for 51%, 37%, and 11% of the variance in heat, electricity, and water consumption, respectively, between dwellings. Abrahamse and Steg in [
54] argued that in order to change household energy consumption behavior, it is important to understand the impact of sociodemographic and psychological factors on household attitudes and perceptions toward green building development, particularly to identify barriers and opportunities to achieving sustainable homes from the household perspective. Later in 2013, several studies were conducted in different countries to address the contribution of occupants of residential buildings to actual energy consumption from different perspectives [
55,
56]. In addition, a framework to improve the sustainability of residential buildings was proposed by [
57], which investigated the motivation and behavior of residential building occupants in terms of energy savings and its impact on greenhouse gas emissions. Canale et al. [
58] contend that the physical properties of the buildings alone are not enough to reduce their energy consumption and that occupants’ behavior is an influential factor in the real energy consumption of a building.
In addition, several studies have assessed the impact of environmental awareness on pro-environmental behavior [
59]. For instance, Sekhokoane et al. [
60] claimed that individuals with high environmental awareness are more likely to behave in an environmentally sustainable manner. Similarly, Yilmaz et al. [
61] found that lack of awareness could lead to insignificant and minimal changes in individual behavior, and, consequently, dependence on government actions. Nevertheless, awareness does not necessarily result in environmental behavior [
62]. Hadlock and Beckwith [
63] indicated that individuals do not willingly behave sustainably and in favor of the environment unless they experience opposing impacts of environmental problems. Accordingly, there is a lack of consensus in the literature on the environmental awareness–behavior relationship [
64]. Most of these studies have concentrated only on certain and selected aspects of environmental awareness. This study argues that this approach to identifying awareness and perception has limitations as it only captures a part of this whole construct. It attempts to create a comprehensive model, which provides a holistic means of assessing the perception of sustainability taking into consideration its three pillars (economic, social, and environmental).
Despite the complex and multi-dimensional nature of sustainability in terms of balancing the three pillars, environmental, economic, and social, prior research often focused on a single dimension–the environment. Although a good deal of research has been published in the area of sustainability, there are very limited studies that have addressed sustainability awareness and application as a whole [
38]. Hence, investigating stakeholders’ awareness and behaviors in the residential sector is essential to understand the dynamic interactions and promote coordination among them [
65]. The significance of such research can be a base for improving the decision-making process and promoting sustainability in the built environment [
66].
Although studying occupants’ perceptions and behaviors toward more efficient resource use can have an impact on energy conservation and the reduction of emissions, a clear understanding of occupants’ perception of the big picture of SD including the three dimensions (economic, environmental, social) helps policymakers, designers, and building professionals not only identify gaps in current policies and develop potential new technologies, but also understand the attitudes, knowledge, preferences, and behaviors of building occupants toward sustainable measures and improve their behaviors through educational programs.
1.4. Sustainability Indicators
Sustainability perceptions by residential occupants are assessed based on the extracted indicators from the relevant literature, where the final selection of the indicators is verified by experts in the field to assure their compliance with the prevailing standards and regulations within the UAE. Several studies have discussed the sustainability of residential buildings; however, it is an evolutionary process that needs to be continually enhanced, considering any change that impacts the social, environmental, or economic pillars of sustainability.
According to [
67], the first category is health and safety, and it involves the prevention of virus propagation using new smart, innovative, and touchless technologies [
67,
68,
69,
70], self-cleaning spaces [
71], proper selection of indoor materials [
70,
72], allowing natural daylight (as sunlight enables a healthy environment and prevents the viability of viruses) [
73,
74], and the adjustability of indoor temperature and humidity; these are all influential factors in virus propagation, yet they are subjective to the perception of occupants [
75,
76,
77]. The second category is mental health for occupants, which includes the availability of greenery and gardens such as indoor gardens, green views, and green balconies, which enhance relaxation and reduce the risk of stress-related diseases [
78,
79], availability of outdoor spaces in the building (balconies) as they improve the mental health of occupants [
80,
81], access to common building spaces with sufficient safety and social distance, and household-level activity/sports spaces to boost immunity and reduce stress.
The third category is air quality, and it includes the efficiency of air filtration systems to monitor and control indoor air pollution and develop a moderate fresh air circulation [
67,
82]. Ref. [
83] highlighted that people’s perceptions of the indoor environment depend on an interaction between the physical properties of the room (temperature) and the psychological associations with the ‘green’ certification. The fourth category is water quality and availability, and it includes safety measures for drinking water and/or tap water from contamination [
67,
84]. Finally, the fifth category in this group is related to wastewater management and it includes specific measures to limit virus propagation at a household level to avoid transmission of viruses through wastewater [
85,
86].
Moreover, the environmental resources consumption category includes three aspects [
67], where the first aspect is related to energy use, promotion of sustainable and alternative energy sources to improve the environmental effect, and the use of energy-efficient appliances to resolve the increase in energy consumption. The second aspect is for waste management [
87], and the last is related to water consumption including the access to alternative water sources as well as the use of water-efficient appliances and fixtures.
In addition, the last category of sustainability as discussed by [
67] is comfort, which has two aspects: personal comfort and local services. Personal comfort is related to a specific emphasis on household-level ICT infrastructure access to enable studying, working, food delivery, and medical consultation [
88,
89], levels of indoor space adjustability [
78], and acoustic comfort [
90]. On the other hand, local services include the availability of self-dependent services in residential complexes, especially for medicine and food [
91], and urban/community farming to reduce the paths for food supply and enhance mental health [
92]. Based on the aforementioned sustainability indicators, expert groups from academia, industry, and medicine were surveyed in 17 countries [
93], and the results showed that health and safety have the highest importance, with more attention paid to the prevention of virus propagation, mental health, and air quality. Additionally, the experts agreed that touchless technologies, self-cleaning spaces, and smart technologies contribute to avoiding the spread of viruses.
According to global definitions of social sustainability, the needs of social groups should be addressed to improve overall satisfaction [
94]. In terms of occupants’ needs in housing, the social aspect of a well-known sustainability assessment scheme only considered indoor environmental quality in most of the studies in the literature. However, social sustainability includes various issues from safety to other physiological and psychological needs of stakeholders [
95]. Based on this, many researchers exploited social indicators for the sustainability evaluation of buildings based on the context of their countries. For example, Ahmad and Theheem [
96] developed a social sustainability assessment framework for residential buildings in Pakistan to address the lack of social aspects in the assessment framework of this country. Likewise, Ullah et al. [
97] developed a framework focusing relatively more on social issues for assessing the sustainability of residential buildings in Pakistan.
Similarly, a recent study conducted by Fatourehch et al. [
94] addressed sustainability issues in the assessment framework of residential buildings in Iran. This study considered more detailed indicators in terms of social aspects of sustainability issues regarding Iranian residential buildings. It investigated the most common social aspects, which were identified by prior literature for the assessment of residential buildings worldwide. In addition, Maleki et al. [
98] formulated a sustainability assessment model highlighting the social sustainability aspects of residential high-rise buildings (RHRB). The authors argued that emphasizing the social indicators is important, as they are effective for assessing the human relationship with the physical environment (housing).
Another study conducted by Karji et al. [
99] sought to rectify the evaluative inequity between the social bottom lines and the economic and environmental bottom lines of sustainability within the existing sustainability rating systems for buildings (LEED, BREAM, CASBEE, etc.). The indicators were tested in one of Iran’s largest mass housing projects. In previous research, some researchers have reviewed existing literature regarding sustainability assessment for buildings. For example, Sierra et al. [
100] conducted a comprehensive review of various Green Building Rating Systems (GBRS) adopted by the current sustainable construction community. The authors note that despite the vast research regarding GBRS, little has been done to examine the stakeholders’ perceptions of GBRS.
In addition, [
101] has built a multi-criteria framework to assess the sustainability of buildings in Kazakhstan; the sustainability categories and indicators were extracted from four assessment tools (LEED, BREEAM, CASBEE, and SBTool) as well as the related literature, then experts were interviewed to specify the indicators that are applicable in Kazakhstan, where 35 indicators were validated for the analysis. Alyami et al. [
102] designed a measurement framework to evaluate the principles of sustainable construction for residential buildings in Saudi Arabia by analyzing the leading international sustainable assessment schemes: BREEAM, LEED, SBTool, and CASBEE. The authors concluded that international schemes are inapplicable for the Saudi context, and there is a need to develop further categories and criteria for the assessment of the built environment in Saudi Arabia.
Interestingly, another study has been conducted in Kazakhstan to assess sustainability in residential buildings and how far is it from the green building indicators [
103]; the study was based on a survey of occupants that covers different sustainability categories. The result of this study indicated that old buildings tend to have a poor sustainability level based on the responses of their occupants, while new buildings have an increasing interest in sustainability, especially when it is linked to economic aspects. Kamali and Hewage [
104] conducted qualitative and systematic research for sustainable building rating systems and journal/conference articles to develop a list of sustainability criteria related to each sustainability pillar (TBL).
In addition, six case studies were conducted in Brno and Vienna [
105] to study how open spaces between residential buildings affect sustainability. The results support the importance of green open spaces in enhancing the SD for the residential sector, however, the indicators were obtained from a comprehensive literature review. Winston [
106] outlined an analytical framework for assessing sustainable housing and regeneration in Dublin, Ireland. This framework included characteristics that are associated with each of the key aspects of housing, which were derived from literature on sustainability. Another customized sustainability assessment system for multi-apartment buildings in Slovenia was proposed by [
107]; although various aspects were included in the system, such as functionality, safety, and security aspects, the economic aspect was not considered.
Moreover, a case study was performed in Portugal to assess the sustainability of new, existing, and renovated residential buildings [
108]. The indicators were obtained from the SBTool assessment system by customizing the set of indicators that are related to the context of the study, and they covered the three dimensions of sustainability; the proposed methodology supports the direction towards sustainability by identifying the objectives for the contractors working in residential sectors. Another study was conducted in Malaysia to identify and rank sustainability indicators for assessing green buildings [
109]. This was accomplished through employing appropriate GBRSs and their associated sustainability indicators to evaluate and confirm the level of greenness and sustainability of buildings in the manufacturing sector.
Al-Jebouri et al. [
110] developed a framework for sustainable building construction in Oman by proposing an assessment system for the construction industry. The indicators of the proposed rating system for Oman were derived by reviewing the literature on SD and buildings as well as analyzing international and regional sustainable building-rating systems, such as LEED, BREEAM, and UAE Estidama. Moreover, Karaca et al. [
76] argue that existing methods in the literature mostly suggest indicator scores in construction sustainability assessments using highly technical data and require a high level of engineering expertise. Therefore, the authors developed a detailed method called A Rapid Sustainability Assessment Method (RSAM) that uses residents’ opinions-based sustainability in Kazakhstan.
A set of ratio-based indicators and rating functions for building rating systems in a global context was developed by [
111,
112], where the building sustainability rating system was proposed with two main features, namely, the use of quantifiable indicators instead of subjective ratings for aspects, and the use of continuous functions for indicator ratings because such functions allow better comparisons between buildings than step functions. In addition, a contextual assessment approach for residential buildings in Hongkong was proposed by [
113]. The proposed approach aimed to assess and improve the integrated sustainability of public rental housing to improve the livelihoods of middle-and low-income families.
Given that the majority of the proposed assessment tools and methods were either complex or focused only on single issues, this encouraged researchers to develop simplified methods for assessing building sustainability. Markelj in [
114], for example, developed a simple method for assessing the sustainability of Slovenian buildings in the early design phase and included economic and safety aspects in addition to the basic categories. In 2016, Raut [
115] proposed a system for assessing the sustainability of residential buildings in Mumbai. The proposed methodology was used in the selection of sustainable residential buildings, using both relative benchmarking and absolute benchmarking, which provides a tangible means of evaluating residential buildings.
A study performed by Janjua et al. [
116] proposed a holistic life cycle sustainability assessment (LCSA) framework based on the TBL indicators to address the sustainability performance of residential buildings, specifically for assessing Australian buildings. The TBL indicator selection was carried out systematically based on a literature review. After that, the stakeholders directly or indirectly involved in the building sector were given a platform to provide their opinions and become a part of the selection process of indicators. Another framework was developed by Kamili et al. [
117] for the sustainability assessment of modular buildings. The authors conducted a comprehensive literature review including reviewing different rating systems such as LEED, Green Globes, and LBC, as well as journal/conference articles.
In addition, an assessment scale was proposed to evaluate sustainability from the perspectives of residents–as the main stakeholders–in Thailand. The authors extracted their indicators using theoretical bases from a literature review of related concepts, such as sustainable cities, urban sustainability, sustainable urban forms, and eco-cities [
118]. Furthermore, it was noted that construction and buildings’ operation are, from the perspective of SD, unsustainable energy processes. Therefore, the authors developed an overall sustainability index based on the TBL indicators. They note that defining and determining the economic, social, and environmental indicators was developed based on the energy consumption of residential buildings in Belgrade city in Serbia [
119]. In addition, Amasuomo et al. [
120] established an assessment tool for residential buildings in Nigeria based on international rating tools to adapt it to the Nigerian requirements.
In the context of UAE, a few papers have looked at sustainability assessment and indicators in the residential sector, although there is a good deal of research in this area. For instance, Ref. [
121] assessed the sustainability of three types of building (heritage, ordinary modern, and sustainable modern buildings) using the Analytical Hierarchy Process (AHP) based on conducting a survey that targeted experts only. The purpose was to integrate the sustainable principles and enhance the overall sustainability of these buildings. Moreover, the results showed that sustainable modern buildings are the most preferred alternative, followed by heritage buildings and ordinary modern buildings. Furthermore, amongst the sustainability dimensions, economic and environmental have the highest priority. In a study conducted by Baird [
122], a worldwide set of commercial and institutional buildings, with well-recognized sustainability credentials, were evaluated to find out the users’ perceptions of their performance. One of the main conclusions of this study is that users perceived sustainable buildings to be significantly better than conventional ones, which indicates that building occupants are quite capable of assessing the performance of the buildings they occupy, and to a relatively fine degree. To summarize, the considered indicators in this study are summarized in
Table 1; they were drawn from numerous conceptual frameworks and models that are built and applied in different contexts in the literature.
Afterward, a validation process by experts was performed to fit the UAE’s residential sector, as illustrated in
Table 2. For practical purposes, four criteria were used to evaluate the indicators adopted in this research and to determine their eligibility for inclusion, where the indicators are chosen based on their relevance, recency, being the most cited in the literature, and where studies that have identified indicators must look at different contexts, not just one particular context.
Table 2 indicates that this is the first study that comprehensively and simultaneously assesses the sustainability perceptions of residential occupants in the UAE in addressing the environmental, economic, and social sustainability aspects, which signifies the importance of this paper.
In addition, the initial building assessment systems were limited to basic aspects such as location, energy, water, materials, waste, pollution, and indoor environmental quality, while the new ones developed in the last decade added several categories to the field of rating systems. Most of the new systems also consider cost and economic aspects. Other added categories include safety, usability and functionality, local culture, outdoor environmental quality, impact on adjacent properties, time, low-carbon aspects, and project design aspects that have improved and enriched the existing systems. Although some building assessment systems have been proposed for some countries, no studies have been conducted to present an assessment system for buildings in other countries such as the UAE.
Moreover,
Figure 2 shows the published research work in the sustainability and SD areas in the UAE. It can be observed that their importance has increased across the years, especially in the engineering, environmental, social sciences, and energy—as per Scopus research analysis, which is considered one of the premium databases and peer-reviewed journals [
123].
Table 3 illustrates a summary of studies found in the literature concerning sustainability perceptions and the methods adopted for each study in different contexts. It can be noticed that only one study took place in the UAE [
124] to assess buildings as heritage, ordinary modern, or sustainable modern buildings concerning defined sustainability criteria. More importantly, none of the studies in all the different contexts, including the UAE, aimed at providing a comprehensive framework to assess the perception of the sustainability of the residential sector in the UAE, which embodies and addresses environmental, economic, and social sustainability aspects. In terms of the methods, it can be noted that none of the studies used Structural Equation Modeling (SEM) to measure sustainability perceptions. Therefore, these findings signify the importance of this paper.
In conclusion, the significance of this study lies in targeting the residential sector, which has a major influence on the environmental, social, and economic aspects due to it being the highest reported statistic in consuming energy resources in addition to contributing to greenhouse gas emissions and air pollution. Moreover, since the targeted population represents a large segment of the community, the outcomes of this study would be beneficial to policy/decision-makers, developers, contractors, designers, facility management entities, etc., to allow regulating and applying supportive sustainability practices to enhance overall sustainability in the residential sector. To the best of the authors’ knowledge, this is the first study of its kind that represents a comprehensive assessment of the perception and awareness of occupants in the residential buildings in the UAE based on the TBL paradigm, which is in line with the strategic direction of the UAE towards sustainable development.