Green architecture designs and constructs buildings to minimize harmful effects on human health and the environment. It reduces resource use, pollution and waste across a building’s life cycle.
This is HL-only content in IB ESS subtopic 8.2 Urban systems and urban planning. Buildings are open systems: energy, water and materials enter, while heat, wastewater, emissions and solid waste leave.
Green architecture reduces these inputs and outputs through site selection, design, construction, operation and demolition. It can therefore support the environmental, social and economic pillars of sustainability.
| Design strategy | How it minimizes environmental harm |
|---|---|
| Passive solar design, insulation and natural ventilation | Reduce demand for heating, cooling and lighting, lowering greenhouse gas emissions. |
| Renewable energy systems | Reduce dependence on non-renewable energy sources. |
| Sustainable materials | Recycled, reclaimed, local or responsibly sourced materials reduce resource depletion, transport emissions and construction waste. |
| Water-efficient systems | Low-flow fittings, rainwater harvesting and greywater reuse reduce freshwater withdrawals and wastewater outputs. |
| Green roofs and permeable surfaces | Reduce run-off, provide habitat, improve insulation and moderate the urban heat island effect. |
| Adaptable, durable construction | Extends building life and reduces demolition and replacement waste. |
A named example is BedZED in London, a mixed-use development incorporating strong insulation, passive heating, reduced car dependence and water-saving measures. However, green technologies may have high initial costs, while their benefits depend on occupant behaviour, maintenance and the impacts of producing materials.
A common misconception is that plants or solar panels automatically make a building green. Green architecture requires a holistic life-cycle approach, not one visible feature. It also raises environmental justice concerns if efficient, healthy buildings remain affordable only to wealthier groups.
Exam technique: For “explain,” connect a design feature through a clear causal chain to reduced harm. For “evaluate,” balance benefits against costs, limitations and stakeholder perspectives, then reach a supported conclusion using a named example.