Building Design from a Systems Perspective

Written By UTA Architects Ltd

Buildings as Complex, ‘Living’ Systems

From a systems perspective, the “sustainability” of a system is not a fixed attribute or a checklist outcome. It is far more important: a key metric of resilience and vitality of a system. It is an emergent property — a dynamic condition that arises from the nonlinear interactions among multiple, interdependent elements over time. In other words, sustainability is not something we add to a building; it is something that emerges from the relationships between its materials, technologies, users, economic context, ecological setting and governance structures. When these relationships reinforce long-term viability (ecological, social and economic) the system persists and adapts. When they degrade one another, the system becomes brittle, extractive and ultimately unviable.

Buildings and cities exemplify this principle.

1. BUILDINGS AS COMPLEX SYSTEMS

Buildings are not static objects. They are socio-technical-ecological systems embedded within larger systems. Buildings involve interacting governmental, economic, environmental, technological, behavioural and societal dimensions, all linked by feedback loops (1). Health and wellbeing outcomes are context-dependent and multilevel, requiring holistic rather than fragmented approaches.

A building can be “regarded as a complex system especially when the physical and human components are considered”, write Nkrumah et al. (2024) (2). Complex systems (e.g. a building, a city) are less controllable than non-complex systems (e.g. an airplane, a car) and have more complicated interactions between the system and its surroundings; and less predictable outcomes. Occupants constantly modify building performance through adaptive actions (e.g. by opening windows, adjusting thermostats, etc.), creating ‘feedback loops’ that shape indoor environmental quality and energy use.

Thus, ‘complexity’ in buildings (as defined by the Systems Theory and Complexity Theory) arises from:

  • Multiple interacting subsystems (structure, envelope, HVAC, lighting, controls, water, materials)

  • Human–technology interactions

  • Temporal dynamics (aging, maintenance, retrofitting, occupancy changes)

  • Embeddedness within ecological and urban systems

  • Cross-scale interactions (room → building → district → city → technosphere → biosphere)

2. NONLINEARITY AND EMERGENCE IN BUILDINGS

In linear systems, cause and effect are proportional and predictable. In buildings, however:

  • A minor design decision (e.g., glazing ratio) can cascade into major energy, comfort and health consequences.

  • Small air leakage pathways can dramatically increase moisture accumulation and mould risk.

  • Social factors (organisational culture, maintenance budgets) can undermine high-performance technologies.

Systems thinking evaluates emergent properties of systems rather than focusing on isolated components. Emergent properties do not exist in the system components but only emerge as a result of the system. For example, a building is an assembly of components that is greater than the sum of its parts. Emergent properties in a building include: the ability to provide shelter, comfort, aesthetic beauty, make possible human activities such as education, social events, etc. None of these properties exist in a brick or a window, or any other component that makes up the building.

Systems also have feedback loops, which are important for the system to function well. For example: improvements in one building ‘domain’ (e.g., energy efficiency) can unintentionally degrade another (e.g., indoor air quality) if feedback loops are ignored.

Sustainability, therefore, is an emergent property because it depends on:

  1. Feedback loops in the system

  2. The system’s ability to adapt

  3. Resource cycling (circularity)

  4. Collaboration, stakeholder alignment, multi-disciplinary approach

  5. Long-term resilience

While ‘closed systems’ can be controlled more easily, ‘complex systems’ cannot. A building supports human life, has ‘metabolic’ activities and is part of the larger systems of technosphere and biosphere. These facts make the building a complex system. Therefore the system risks failure and ceases to serve its purpose if the above five points are not in place and functional.

Consider the human body as a complex system - the cells and organs work in a collaborative way with communication channels (the nervous system, hormones, etc.) and a great ability to adapt to external circumstances. Without collaboration, feedback and adaptability, the human body could not function and provide life, the system would fail.

3. THE BIOSPHERE AND TECHNOSPHERE: A METABOLIC PERSPECTIVE

According to ‘Sustainability and Health in Intelligent Buildings’ (Habash, 2022) (3), the technosphere (human-made addition to the biosphere) increasingly mirrors but fundamentally differs from the biosphere. The biosphere operates through circular ‘metabolisms’: waste from one process becomes nutrient for another. The technosphere, by contrast, has historically operated in a linear way: extract → manufacture → use → discard.

Buildings are ‘metabolic nodes’ within this technosphere. They:

  • Consume energy and materials

  • Transform water and air

  • Produce waste and emissions

  • Influence ecological flows

If building systems fail to emulate circular principles, they contribute to ecological overshoot and long-term system instability.

4. HEALTH AS A SYSTEM OUTCOME

Healthy buildings are not defined solely by simple metrics such as low VOC materials or efficient ventilation rates. The life cycle of a building can be compared to a living organism — mechanical systems functioning like circulatory systems, façades acting as skins.

Health in buildings emerges from:

  • Air quality

  • Moisture management

  • Water quality, hydration promotion

  • Thermal stability

  • Daylight and circadian alignment

  • Acoustic comfort

  • Health-promoting materials, circularity

  • Active lifestyle -promoting features

  • Healthy nutrition -promoting features

  • Nature connection, biodiversity

  • Social life and community integration

  • Collaboration, diversity, inclusion, empowerment

  • Physical and psychological safety

  • Microbiome within the building and site

  • Emergency preparedness, resilience

  • Management policies

  • Maintenance practices

  • Surveys, consultation, monitoring of metrics

  • Adaptability, flexibility

  • Design for disassembly

  • Whole-life design: costing, carbon, material life

The “Creating Healthy and Sustainable Buildings“ book (Dovjak, Kukec, 2019) (4) reminds us that sustainability includes environmental, social, economic and health dimensions. Health is not separate from sustainability — it is a central performance indicator of system coherence.

5. FEEDBACK LOOPS AND ABILITY TO ADAPT

Healthy and sustainable buildings require feedback.

According to the ‘LEED Core Concepts Guide’ (5), green building practice depends on embedding feedback loops throughout design and operation. Without measurement, survey or evaluation (feedback), there is no ability to adjust the system, no regulation; and without regulation and flexibility, there is no resilience. A system that is unable to adjust eventually breaks down or becomes ‘chaotic’, out of balance.

“Feedback loops are the information flows within a system that allow that system to organize itself.”

- U.S. Green Building Council (USGBC): LEED Core Concepts Guide, 3rd. ed., p. 21

Examples of critical feedback loops:

  • Indoor air quality sensors linked to adaptive ventilation

  • Post-occupancy evaluations informing design refinements

  • Energy dashboards influencing occupant behaviour

  • Maintenance systems preventing moisture-related degradation

Buildings that lack feedback mechanisms become fragile. An intelligent building (IB), as described in “Sustainability and Health in Intelligent Buildings“ (3), “knows what is happening inside it and immediately outside” and responds efficiently. However, technological intelligence alone is insufficient; human-centered intelligence is equally critical.

6. CROSS-SCALE INTERDEPENDENCE

Buildings are ‘nested systems’, i.e. systems inside systems. According to BI & Little (2022) (6), writing in the Sustainable Cities and Society Journal, a holistic, multi-scale “system-of-systems” approach is needed to assess sustainability across building and urban scales.

A building cannot be healthy if:

  • Its urban context exposes occupants to pollution and noise.

  • Its supply chain exploits ecosystems and communities.

  • Its energy sources destabilise climate systems.

  • Its waste streams have a negative impact on the natural world.

  • Etc.

Urban ecosystems thinking, referenced in “Regenerating Cities: Reviving Places and Planet” by Zingoni de Baro (7), suggests cities should mimic ecological principles such as diversity, adaptation, interconnectedness and regenerative capacity.

Thus, a healthy building is in ‘communication’ with and must be evaluated in the context of:

  • The neighborhood

  • The infrastructure network

  • The energy grid

  • The watershed

  • The global climate system

  • Etc.

7. RESILIENCE AND ADAPTIVE CAPACITY

According to “Undoing Buildings: Adaptive Reuse and Cultural Memory“ by Stone (2019) (8), resilient buildings possess the ability to accommodate change, recover from disturbance and function in a ‘state of health’.

Key characteristics include:

  • Flexible spatial planning

  • Self-sufficiency during outages

  • Climate adaptability

  • Material durability and reusability

Sustainability over time depends on a building’s ability to reorganise as a system without failure.

8. MOVING BEYOND “GREEN” TOWARD SYSTEMIC HEALTH

Xie et al. (2017) (9) argue that we must move beyond narrow green metrics toward healthy, comfortable, sustainable and aesthetic architecture.

Many green certifications historically prioritised energy metrics. However, a systems perspective reveals trade-offs, such as:

  • Airtightness without ventilation → pollutant build-up

  • Highly insulated envelopes without careful moisture management → mould risk

  • Smart systems without usability → occupant frustration

A systems approach integrates:

  • Environmental performance

  • Human physiology & psychology

  • Social wellbeing

  • Ethical responsibility

  • Etc.

A building as a healthy system, able to operate in homeostasis (balance, equilibrium), must harmoniously co-exist with the other systems it interacts with.

9. ROOT CAUSES OF UNHEALTHY BUILDINGS

From a systemic viewpoint, unhealthy buildings typically result from:

  • Fragmented design processes (disciplinary silos)

  • Linear economic models (short-term cost over lifecycle value)

  • Lack of feedback data

  • Poor commissioning and maintenance

  • Disconnection from ecological cycles

  • Misaligned incentives between stakeholders

  • Etc.

As the book “Whole Life Sustainability” by Ellingham & Fawcett (2013) (10) highlights, sustainability lacks consensus when stakeholders prioritise different objectives. Misalignment itself becomes a systemic vulnerability.

CONCLUSION: SUSTAINABILITY AS EQUILIBRIUM

When viewed through systems thinking, sustainability is not a label but a dynamic equilibrium — a condition in which buildings contribute to, rather than degrade, the ecological and social systems that sustain life.

Healthy buildings are:

  • Ecologically regenerative

  • Physiologically supportive

  • Psychologically enriching

  • Socially cohesive

  • Economically viable

  • Etc.

The challenge before architects, engineers and policymakers is not merely to design efficient structures but to cultivate healthy relationships — between materials and climate, people and places, technology and nature, buildings and their context.

In this sense, buildings become less like machines and more like active participants in the biosphere.

RECOMMENDED RESOURCES

Books:

  • Habash, Riadh: Sustainability and Health in Intelligent Buildings

  • Loftness, Vivian (ed.): Sustainable Built Environments

  • Meadows, Donella H., Wright, Diana: Thinking in Systems

  • Mitchell, Melanie: Complexity: A Guided Tour

  • Zingoni de Baro, Maria Elena: Regenerating Cities: Reviving Places and Planet

DISCLAIMER

We will not accept any liability for the use or misuse of this information. We can provide formal architectural advice only when appointed on a project.

UTA Architects Ltd https://www.ut-a.com
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