The idea of building anew is gaining serious traction in some African cities. Faced with ageing infrastructure, inconsistent service delivery, and rapid urbanisation, master-planned developments like Steyn City in Johannesburg are presented as a modern solution, controlled environments where infrastructure works efficiently and sustainability is designed in from the start.
These estates are very green or sustainable-conscious. They often feature water recycling systems, solar power integration, energy-efficient buildings, and generous green spaces. For residents inside, the improvement in daily living quality is undeniable.
The strong emphasis on self-sufficiency is one of their biggest strengths. By managing their own energy, water and waste systems, these developments for the rich reduce dependence on strained public infrastructure. In South Africa’s context which has for the longest time collectively suffered rollng blackouts, this approach feels both practical and innovative and it turns real challenges into better-designed outcomes.
With public systems struggling, private solutions that actually deliver become very appealing. However, this model raises deeper questions about the kind of sustainability we are building. Sure eco-estates can achieve solid environmental performance within their boundaries, but research suggests they often fall short when it comes to just sustainability that is, sustainability that also advances social equity and benefits wider society. In other words, sustainability should not just be green, it should also be just.
Few would argue that eco-estates do not deliver tangible benefits. Residents enjoy reliable services, well-maintained public spaces and infrastructure that many municipalities struggle to provide consistently. The more difficult issue is how widely those benefits are shared.
Because access to these developments is largely determined by income, many of their advantages remain available only to a relatively small segment of the population. Sustainability, in this sense, risks becoming something people buy into rather than something supported through public systems and enjoyed more broadly across the cities.
The debate touches on how cities develop, who benefits from investment, and whether environmental improvements are becoming concentrated in private enclaves rather than strengthening the urban fabric as a whole.
Research on Johannesburg’s eco-estates suggests that their environmental performance is driven as much by governance as by design. Rules, management structures and behavioural controls influence how residents use water, energy and shared spaces. Sustainability in these developments is not simply built into the landscape; it is actively managed.
This helps explain why many eco-estates perform well environmentally. Their success depends on a level of oversight, maintenance and compliance that can be difficult to replicate across an entire city.
Earlier studies point to a related tension. While eco-estates can improve resource efficiency and environmental outcomes locally, they often remain physically separated from the urban environments around them. The result is that environmental gains may be concentrated in specific areas without necessarily addressing the broader inequalities that shape urban life.
The pattern is not unique to South Africa. Around the world, environmental improvements increasingly cluster in wealthier, better-resourced communities, while lower-income areas continue to face infrastructure failures, environmental risks and limited access to green amenities. In this context, sustainability can end up reflecting existing inequalities rather than reducing them.
None of this means eco-estates should not exist. In many respects, they are responding to real challenges that governments and municipalities have struggled to solve. They demonstrate what is possible when infrastructure is maintained, resources are managed efficiently and environmental considerations are built into development from the outset.
At the same time, they reveal a contradiction at the heart of contemporary urban sustainability. Environmental progress may be accelerating, but access to its benefits is often uneven.
So the issue is not whether eco-estates are green, efficient or well-designed. It is whether they represent a model that can help transform cities more broadly, or one that concentrates sustainability behind walls, rules and property boundaries. In the end, eco-estates are never just green. They are a reflection of how sustainability itself is being redefined in unequal cities ,and who gets to live inside it.
