How your building can contribute to citywide sustainable ambitions aligned with global benchmarks.

Urban October runs from World Habitat Day on 5 October to World Cities Day on 31 October, and for that month UN-Habitat asks the world to look at cities as the place where climate targets get tested against daily life. It's fitting, then, that the GBCSA's 19th Annual Green Building Convention lands squarely within this window, taking place in Cape Town from 27–29 October - and our team will be there, engaging with exactly these conversations that Urban October is asking us to have.

The UN Environment Programme's Global Status Report for Buildings and Construction 2025-2026 puts the sector at around 37% of global carbon emissions, making every design decision a climate one and encouraging us to reflect on how our cities will contribute to positive long-term climate management.

When a city sets rules for how buildings should be constructed, they are ultimately taking responsibility for the legacy that building will leave - whether it will be one that positively contributes to our changing climate, or whether it will continue to place a strain on our natural and limited resources.

Decisions made at the building level have consequences beyond the building itself. This is something we take into consideration in all our projects. For example, Darling Brew utilised a  reflective roof coating that reduces its cooling load, alongside harvested rainwater. The District in Woodstock, which took itself off Cape Town's municipal water grid entirely, draws on an on-site spring and filtration plant instead, while Newinbosch outside Stellenbosch extended it to a whole neighbourhood with a precinct-wide smart microgrid that draws close to 65% of its energy from renewables. These outcomes reflect the cumulative decisions of project teams , which shape the built environment and the broader impacts building designs have at the city level.

Johannesburg has taken one of the country's most decisive positions through its City of Johannesburg Green Building Policy: New Buildings, adopted in June 2021. The policy folds sustainability requirements into the building-plan approval process, so developers must demonstrate energy and resource performance when submitting plans, and a building that falls short of the mandatory standards can have its occupation certificate withheld until it complies. It supports the city's aim of reaching low- to net-zero carbon performance for all new buildings by 2030, and it grew out of Johannesburg's work with the C40 Cities network.

Cape Town pulls the same thread with a slightly different approach; it joined the C40 Cities Climate Leadership Group and aligned its climate planning with the Paris Agreement through the network's Deadline 2020 programme in 2017. The city has committed to carbon neutrality by 2050, and its 2026 State of Energy and Carbon report shows greenhouse gas emissions already falling in line with that voluntary commitment. However, the targets will steepen sharply after 2030. C40 membership sets a practical design standard for Cape Town to adopt a more energy- and carbon-conscious mandate for the built environment.

Fifteen years of working across a wide and varied typology of projects have honed our awareness of how each building type plays a distinct role in managing our cities' carbon, energy, water, and waste management objectives. Each certification pathway that we are able to assist in achieving  plays a unique role in helping our clients leverage their buildings to contribute to the citywide goals mentioned above.

We have selected one example per building category from some of the most prominent project typologies to highlight different sustainable interventions you and your business could consider if you're looking to contribute to these goals.

The District, a Growthpoint commercial property of roughly 18,720 square metres in Woodstock, Cape Town, became the first commercial building in the city to certify Net Zero Water, meaning it no longer draws on the municipal water grid to meet its needs. In a city that came within weeks of Day Zero during its 2018 drought, a large office building stepping off the grid becomes a piece of civic resilience, because every litre it does not demand is a litre left for a household. The seven-storey building sits on a naturally occurring spring, and a basement filtration plant fed by four sumps turns that spring into around 140 kilolitres a day, enough to supply everything the offices use, from drinking water to toilet flushing.

Newinbosch, a neighbourhood estate outside Stellenbosch, holds the distinction of being Africa's first precinct to earn a 6-Star Green Star certification, awarded in April 2024, which lifts the unit of measurement from a single building up to the scale of a small piece of city. Certifying a whole precinct means shared open space and the way water and energy move between homes fall under one design logic, so residents inherit performance they never have to think about. The estate brings together 1,398 homes under that rating, and a precinct-wide smart microgrid is designed to source close to 65% of its energy from renewables and to hold power through load-shedding to stage four, with the first residential phases certified EDGE Advanced for at least 40% better energy performance than standard construction. It is a working model for how a denser, and more liveable South African suburb can be built.

Darling Brew, a microbrewery in the small Western Cape town of Darling, became Africa's first carbon-neutral brewery after we ran its greenhouse gas audit, and we went on to assist them in achieving a  4-Star Green Star SA rating for Existing Building Performance, the first brewery in the country to earn a Green Star rating. A brewery runs hot and thirsty, with energy and water demand tied to every production batch, so most of the work focused on cutting demand at source and offsetting the emissions that remained. The plant captures spent process water from the brewing and reuses it to wash floors, and it harvests rainwater off the roof for staff ablutions and irrigation. Waterless urinals and a reflective roof coating do the quieter work of holding down water use and cooling load.

Each of these building types contributes differently to the broader objectives, but none is less important than the others. We believe the built environment can be one of the most impactful climate levers for cities and countries because, in South Africa, a single sector shapes far more than its own footprint.

Buildings typically stand for between 40 and 120 years, according to Climate Analytics' 1.5°C National Pathway Explorer, so every design decision made today will outlast the people who made it. It's this kind of decision, made at the project level but felt at the city level, that will be on the table when the industry gathers for the GBCSA's 19th Annual Green Building Convention in Cape Town this October.