Could 3D-printed concrete be the answer to South Africa's social housing crisis?
Nabila Essa, a Master of Philosophy (MPhil) graduate from the University of Cape Town (UCT), believes this could be the case. Essa, who graduated from an MPhil in Inclusive Innovation in April, said 3D-printed concrete has the power to transform the lives and living conditions of millions of South Africans living on the margins of society. And through her research, she was determined to prove it.
3D-printed concrete is an automated, additive manufacturing technology that extracts special cement-based mixtures layer by layer to create structures directly from digital models. This eliminates the need for traditional formwork (moulds into which concrete is either pre-poured or poured into place); Reduces material waste and allows better geometric freedom in complex building structures. The process is believed to provide a cost-effective, fast-moving method for construction.
Following the completion of her graduation, UCT News caught up with Essa to learn more about her research and why she believes 3D-printed concrete could be the answer to the country's social housing crisis.
Neemah Davids (ND): This research formed the basis of your MPhil. Please provide some background on that academic project.
Nabila Essa (NE): The MPhil in Inclusive Innovation is a valuable program that examines how innovation can be leveraged to address complex societal challenges.
“South Africa's persistent social housing backlog, now exceeding two million units, provided the context for this study.”
South Africa's persistent social housing backlog, now exceeding two million units, provided the context for this study. While 3D-printed concrete has generated global interest for its ability to speed up construction and reduce costs, there has been limited exploration of whether it is socially and institutionally viable in South Africa. Rather than focusing solely on technical feasibility, my research questions the social, political, economic and institutional conditions that determine whether such technologies can realistically be adapted for social housing in our context.
ND: Now let's dive into the details of adopting the use of 3D-printed concrete for social housing. Please tell us more.
Northeast: Well, this is not a linear, technical rollout. It is a compromise-based, socio-technical process. While the technology offers speed, stability, and cost advantages, its adoption is hindered by deep-rooted cultural preferences for brick-and-mortar housing; fragmented regulatory frameworks; labor concerns; and public mistrust created by previous housing delivery failures.
My research shows that adoption requires phased and strategic development. It all must start with demonstration projects, especially with social infrastructure like schools and clinics. These low-risk environments will help build trust, legitimacy, and social proof. Its adoption also depends on community participation, co-design, upskilling of the current labor workforce and coordinated policy support to ensure that the technology is not considered excludable and to demonstrate that it does not pose any threat to jobs.
ND: What is the goal of this work?
Northeast: For me, it has always been about moving beyond techno-optimism and providing a context-sensitive roadmap for inclusive innovation in housing. Rather than asking whether 3D-printed concrete could work for social housing, the research raises questions under what conditions it should be pursued and how it could contribute to reducing the housing backlog without undermining dignity, livelihoods or public trust. Ultimately, the study aims to inform policy makers, practitioners and researchers about how innovation can be responsibly deployed in highly unequal and politically complex contexts.
ND: This is a new research venture. Where did this idea come from?
Northeast: To be honest, the idea stems from my professional experience in the construction industry and my growing frustration with the housing-delivery model in a country that prioritizes speed and quantity but fails communities in practice. Global narratives often portray 3D printing as a silver bullet for housing, yet its adoption in South Africa is minimal.
I wanted to really interrogate and understand why such promising technologies stall and whether the barriers are less in technology or more in governance, labor mobility, trust and institutional capacity.
ND: Please share your main findings.
Northeast: Allow me to highlight six important findings:
- The technical promise of 3D printing alone is insufficient. Social acceptance, legitimacy and governance are extremely important.
- The strong cultural attachment to brick-and-mortar housing is a major obstacle.
- Fears that thousands of construction workers will lose their jobs are increasing resistance, especially in our context, given the high levels of unemployment.
- Regulatory ambiguity, bureaucratic delays and corruption undermine innovation diffusion.
- Adoption of 3D printing in social infrastructure and micro-residential units (backyard rental units) appears to be more feasible before individual homes.
- Adopting a phased, hybrid approach to its introduction that combines traditional and innovative methods can reduce resistance.
ND: What makes this work unique?
Northeast: I would like to think that this research is unique in three ways: it combines technological innovation systems analysis with a political economy imperative framework, and allows both system-level mechanics and power dynamics to be explained simultaneously; It focuses on the South African context and does not import assumptions from Global North case studies; And it is based on expert interviews with government, academia, industry and civil society – showing how different role players interpret the risks, benefits and legality of 3D printing in housing.
ND: It's interesting work. What is special to you about it?
Northeast: I would say the fact that it treats innovation as not just technological, but deeply human and political. It redefines housing innovation as a collective social effort shaped by belief, history and lived experience. The insights extend beyond manufacturing and provide lessons on how emerging technologies should be introduced in unequal societies.
“It treats innovation as not just technological, but deeply human and political.”
I'm proud to have produced a study that confronts complexity honestly. Rather than advocating for or against the technology, the research holds room for nuance and recognizes both the urgency of housing delivery and the legitimate concerns of communities and the construction workforce. This research highlights inclusion, dignity and agency in discussions that are often dominated by efficiency narratives.
ND: If there's one thing you want roleplayers to take away from your research, what would it be?
Northeast: This research reinforces that innovation without inclusion risks creating inequality. In housing, where dignity, identity and security are deeply linked, technology must be embedded within strong governance, participatory processes and long-term accountability. If approached carefully, 3D-printed concrete could become part of a broader, more humane response to South Africa's housing crisis. But it cannot be successful by living alone.
ND: Where to from here?
Northeast: What is left to do now is to translate this research into practical engagement – sharing the findings with policy makers, industry stakeholders and academics. There is also scope to apply the framework developed in this study to pilot projects and comparative research across the Global South, where similar adoption challenges exist.
Essa's thesis was awarded a Distinction during UCT's Autumn Graduation. Plans to enroll for her PhD at UCT are well underway.