Sustainable housing could play a significant role in the way the continent tackles its housing deficit. We unpack the ground-breaking innovations, Initiatives and ideations developing the ‘green scene’.
In a village in the Mtwara region of Tanzania, a project borne from the concepts of architectural innovation, sustainability and social responsibility is underway. And it’s just one of many aimed at tackling the demand for environmentally-conscious housing in Africa.
A report from the International Finance Corporation (IFC) states that the continent’s housing deficit is estimated at over 97 million units and “this is expected to increase as the continent’s population grows, and urbanization continues”.
The clinical trial in Mtwara, dubbed The Star Homes Project, was initiated in 2021 by Denmark-based Ingvartsen Architects in cooperation with the Hanako Foundation and, according to the company, was developed by a cross-disciplinary team of architects, physicians, entomologists and social scientists along with local community leaders and stakeholders.
However, Jakob Knudsen, Principal Architect at Ingvartsen, says that the focus of the project, initially, was simply to improve the health of the occupants of the houses.
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“The [houses] are made [of ] very light materials. It looks like concrete, but actually it’s a very thin steel profile with a thin plaster, so it has a very low material use. And what looks like glass is basically a net, so we kind of replaced all the walls with netting, and we made this house naturally very cool. We can see that we have lowered the material consumption and CO2 use by 30% to 40% depending on how you calculate it. And that’s because we try to kind of maximize all the components,” he says.
“It actually didn’t start as a sustainability thing. It started as a way to make the buildings cheaper, but we realized, during the process, that actually we are onto something where we’re using far less materials. It also became interesting from a financial side and a material side, and this is what we’re looking at now. We know that these houses are actually working against malaria, we can see that.”
An article from the World Health Organization on Malaria Day 2023 indicates that Tanzania is one of the four countries in Africa that accounted for slightly over half (52%) of all malaria deaths globally in 2021. Further to this, the country alone accounted for 4% of all malaria deaths, and the disease continues to pose a major burden in the northwest and southeastern regions of the country.
As part of the Star Homes Project, the health of the occupants of the 110 constructed homes will be compared to those living in 440 control homes over a three-year period, which is set to conclude this year.
“We conclude by the end of this year, then we have the three- year period. Nothing is published yet, but I can say that we have very promising results already on the malaria [aspect]. There’s a clear benefit from having a new house when you’re looking at malaria. I mean, this is a rural area in Tanzania, so lots of people [have] malaria, and they’re much better protected. But this is one of the first housing projects, to our knowledge, the first time a house has been built and used in this way to demonstrate it.”
Each house also has a 40W solar panel that provides lights in each room and USB charging, and rainwater is collected from the roof and stored in a 2,000-liter tank for clean drinking water. According to Knudsen, based on the materials used, it cost around $9,000 to build at the time.
What does a ‘green’ future look like?
The ongoing demand for affordable housing coupled with growing climate change concerns has brought sustainable or green architecture to the fore.
Britannica defines green architecture as a philosophy of architecture that advocates sustainable energy sources, the conservation of energy, the reuse and safety of building materials, and the siting of a building with consideration of its impact on the environment.
A 2023 report by the United Nations Environment Programme (UNEP) titled, Building Materials And The Climate: Constructing A New Future, indicates that the buildings and construction sector is the largest emitter of greenhouse gases, accounting for 37% of global emissions.
However, herein lies the opportunity. Entrepreneurs and businesses alike have taken up the mantle to innovate, ‘go green’ and make a positive impact on the environment at large.
According to the World Green Building Council’s (WorldGBC) Africa Manifesto for Sustainable Cities and the Built Environment, by 2050, Africa will be home to 1.1 billion more people than it is today, and 80% of the buildings that will exist in Africa in 2050 are yet to be built.
Lisa Reynolds, Chief Executive Officer of the Green Building Council South Africa (GBCSA) and Vice Chair for the WorldGBC’s Africa Regional Network, emphasizes the progress of the collaborative efforts across the continent.
“We’ve got different sort of levels of Green Building Councils. In Africa, there are two established Green Building Councils – South Africa and Kenya, and the others are mixed between emerging and prospective. Our job, and I include Kenya in it, is really to support the prospective and emerging councils,” she tells FORBES AFRICA.
“Africa has [been] hit by climate events, so there is a huge awareness that, whether it be the Green Building Council or governments, [we] have to do something to alleviate these things,” Reynolds adds.
Knudsen echoes the sentiment on collaboration, stating, “I think one of the sustainability problems I see in Africa is that materials are used in a very inefficient way in many local buildings. You could easily save 30% of the materials if there was better knowledge for the builder who’s doing this, but that’s not something you can expect. We need somebody else who knows how to work with building techniques.”
Trash to treasure
In 2019, the first plastic road was laid down in South Africa’s Jeffery’s Bay, and reports, published recently, indicate that it has lasted longer than traditional tar roads. And the uses for this often-troublesome product seem to only increase from here.
As per the United Nations’ goal 11 of making cities and human settlements inclusive, safe, resilient and sustainable, entrepreneurs across Africa are tackling sustainable building prac- tices in their own way.
One such example is Kubik CEO and co-founder, Kidus Asfaw. Kubik, an environmental tech company, takes plastic waste and transforms it into low-carbon, low-cost housing in Ethiopia, where the startup is based.
Asfaw, who has worked for the World Bank, Accenture, and Google, as well as on technology and innovation initiatives for UNICEF, relays the story of how he got into the trash business. “I helped set up the first-ever circular economy project for UNICEF in Cote d’Ivoire, and we were able to create bricks out of plastic waste. We made over 500 schools using those and my love changed from software to trash, affordability, housing and cities. I did that for about four years,” he says.
“During that time, I learned the issues not just around trash, but a multitude of major challenges that human beings that live in cities are facing, especially on rapidly urbanizing continents like Africa. Alongside poor waste management [which] needs to be addressed, affordable housing is probably one of the biggest priorities in many countries right now. And then, of course, there’s climate change.”
Kubik, which was founded in 2021, produces products that are high in compression strength, non-flammable, non-toxic and modular.
“We’re a business that transforms hard-to-recycle plastic waste into building materials that real estate developers can use at a cheaper price than conventional cement-based materials without compromising the quality or safety of those buildings,” says Asfaw.
“Part of them doing business with Kubik [is] they’re also reducing the greenhouse gas impact that they bring to building cities like Addis Ababa. In a nutshell, we take all of that very bad plastic that you typically see in a landfill, and we make things like bricks that can make an entire wall, and that wall is as unremarkable as it looks, because it’s supposed to look just like every other building. What makes it remarkable to us is how accessible it is to lower-income communities, price-wise, and how green and sustainable it is within the real estate sector.”
In South Africa, sisters Kedibone and Kekeletso Tsiloane are tackling the plastic pollution and waste management issue through Ramtsilo Manufacturing and Construction, a company they founded in 2013. The business focuses on transforming hard-to-recycle plastics and other waste products into eco-bricks.
Kekeletso, who has a background in engineering, tells FORBES AFRICA about how this passion project turned into a fully-fledged business in a traditionally male-dominated industry.
“We initially started with small construction jobs, so building roads and building small projects, and that’s when we actually noticed that we spent so much money on materials, specifically bricks for us. We went out to look for a woman-owned brick manufacturing company, which we struggled to find. We then started making the bricks ourselves,” she says.
“I am interested in the green economy and what happens to waste and that grew an interest of learning about the afterlife of waste. In our research, we did not know that plastic had different properties and had different values. In terms of money, per kilogram, in the recycling space, it has different prices as well. And with that, we then sought out to make a product that we’re still comfortable with, but is innovative and in the green space.” South Africa, according to World Wide Fund (WWF), produces over 2.5 million tonnes of plastic annually. And while the bricks produced by Ramtsilo reportedly function in exactly the same way as conventional bricks, Kedibone, who has a finance background, states that the company still had to do a fair amount of educating on the product.
“We’re still having to re-educate people. It’s a plug and play solution but it integrates seamlessly into the construction industry. That was one of our biggest value-adds… the fact that people could easily use the product because they had the same look and feel as the conventional brick,” she explains.
“We then realized there’s additional benefits that come with the products – from an installation perspective, from a condensation water absorption [perspective] – because of the use of the plastic. The brick is actually branded so that people know that they’re [buying] an eco-friendly product. We’ve seen from the retailers, that product doesn’t stay in the retail stores and it’s simply because of the quality [and] the performance of the product.”
According to Kedibone, the bricks can be found at South African retailers like Builders Warehouse and Leroy Merlin in Gauteng. And while Ramtsilo’s business model tends to focus more on partnerships with corporates and retailers – a model that appears to be working well for them – Kubik’s has opted to focus on and develop the company’s relationships with waste pickers.
“We grappled with what our supply chain model should look like for many months. There are thousands of waste pickers in Ethiopia. Most of those pickers happen to be women, over 80% of them, and most of them end up selling their produce for the day to brokers at very low prices that are not economically sustainable for them to pass the poverty line,” he says.
“We wanted our business model to have a supply chain that not only worked at scale and made business/financial sense for us, but ethically is also empowering those that have previously been exploited in this space. We typically would work with city administrations that typically manage landfills. We get into a partnership with them, set up a collection site and we directly source from these waste pickers at prices that are at least three, four times more than what they would normally get from a broker.”
Endless possibilities
A quick search online reveals some of the most commonly-used sustainable materials in construction. Aside from bamboo and recycled plastic, others include recycled or reclaimed wood, cork, Hempcrete and biocomposite cement.
Traditional building practices have also been employed in some parts of the continent. UNEP had published an article about a project at a school in Burkina Faso, where the modules that form the structure for the school are built out of locally- sourced laterite. This is then cut into bricks and left in the sun to harden. The bricks reportedly absorb the heat during the day and radiate it at night.
Another example of innovation at work is the The Wits Flower Hall Examination and Test Centre in South Africa. Ac- cording to a recent release by the institution, the now energy- efficient building has been recognized for its sustainable design and shortlisted in the Creative Reuse category at the World Ar- chitecture Festival, set to take place in November.
“We believe that adaptive reuse is a critical foundation of green sustainable building due to the embodied carbon content of existing buildings. Wits has a great track record of repurposing buildings, for example the Science Stadium,” said Dr Heather Dodd from Savage + Dodd Architects, who worked on this project in 2022, in the release.
The growth of the sustainable or green building space presents significant employment opportunities as well, according to Reynolds.
“The more that certification grows, the more people need to be aware the job opportunities are growing with it. I do a CEO message on all our newsletters; the latest one is talking about job expansion. So, you know, there’s job creation, but there’s also potential for job expansion because we need accredited professionals; we need EDGE experts,” she states. “We did our first certification in 2009. If you think of pre-2009, there were no such things as accredited professionals. Now, small companies are formed just doing certification. It’s a true reflection of job creation and I would try to encourage more and more people to do it. If they’re in the space [and] it’s not job creation, expand your portfolio and go into this space.”
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