When we envision sustainable property development, we often picture sleek, utopian buildings: biophilic interiors that blur the line between indoors and outdoors, rooftops adorned with solar panels, electric vehicle charging stations and bike racks strategically placed to promote eco-friendly transportation. Of course, these urban hubs are powered entirely by renewable energy.
But the reality of the situation is that the most sustainable building is often the one that already exists. The construction industry accounts for nearly 40% of global carbon emissions when you take into account both operational energy use and the embodied carbon in materials, and yet for decades we’ve treated demolition and rebuilding as inevitable, even aspirational. We tear down to build taller, sleeker, and seemingly more efficient.
When we demolish a building, we’re not just destroying walls and ceilings. Every foundation poured, steel beam erected, and concrete slab laid down has a carbon story attached to it—emissions that were generated during the construction process. These emissions are known as embedded carbon, and tearing down a building negates the environmental investments that were already made, essentially rendering the emissions wasted.
As we have gained a deeper understanding of what constitutes true sustainability and reduction of carbon footprints, retaining as much embedded carbon as possible in property development has become a key element. Policymakers have taken note, especially in cities like London where there is a high concentration of historic and aging buildings.
“It’s extremely hard to demolish a building and then use what you’ve taken to then build a new building,” said Nick Millican, CEO of the property development firm Greycoat. “It’s not really practical. So the more you can retain, the better the carbon footprint of what you’re doing.”
Greycoat Real Estate has taken a proactive stance on environmental ethics. Positioning itself as a leader in sustainable property development, the firm has adopted strategies that focus on both carbon reduction and practicality, prioritizing the retention of embedded carbon through large-scale refurbishments. Their efforts are part of a broader movement to shift the perspective of the sector on what sustainability will look like in the coming decades.
Challenges of Demolishing Buildings and Reusing Materials
For many of us, “reduce, reuse, recycle” has become synonymous with sustainability, ingrained in our daily routines and shaping how we think about waste. For years, we’ve been reminded to sort our recyclables, imagining our paper and plastic being transformed into new materials ready to be reused. It’s a mindset that can make it tempting to view property development and construction in the same way—simply tearing down the old and salvaging materials to build something new. In practice, though, the reality is far more complex. The demolition process is full of inefficiencies that take an environmental toll.
- Hazardous Materials: Many older buildings contain materials that at one time were standard but are now known to be toxic such as asbestos or lead paint. The removal of these materials requires careful removal by qualified professionals, and without proper handling the environmental and health risks both increase significantly.
- Structural Complexity: Modern demolition isn’t about taking a wrecking ball to a building and calling it a day. In order to preserve any reusable materials, structures will often need to undergo a painstaking dismantling process, and even with careful deconstruction the lack of precise information about a material’s composition can make it less viable for reuse. As a result, at this point salvaged materials are often underutilized or discarded altogether.
- Sorting and Contamination: Even when materials are technically salvageable, the logistics of sorting demolition waste are a nightmare. A single site might contain steel, wood, concrete, and insulation, all mixed together—and potentially contaminated by hazardous substances. Sorting these materials is labor-intensive and costly, and there is no reliable way to determine in advance what can be successfully salvaged.
- Logistical and Regulatory Barriers: Moving heavy, salvaged materials to recycling facilities is both resource-intensive and expensive, and doing so often ends up offsetting the environmental benefits of reuse. Variations in planning regulations across local councils also create challenges. Nick Millican notes that in London, planning authorities now require substantial justification for demolition, but while these regulations are necessary their uneven enforcement only serves to further complicate the process.
While recycling and reuse programs have potential and shouldn’t be discounted entirely, as it currently stands only 20-30% of construction and demolition waste is recycled globally. Much of the rest ends up in landfills. Tearing down old buildings to build new ones may seem like the more environmentally conscious choice on the surface, but it is a process that is increasingly being recognised for how it generates massive waste and squanders embedded carbon as a result.
Why Refurbishing Existing Structures is More Effective
The instinct to tear down and rebuild stems from the mistaken belief that newness inherently equals efficiency. However, as previously explored the numbers tell a different story. Refurbishing existing structures is a profoundly more effective way to reduce the carbon footprint of property development.
- Preserving Embedded Carbon: Buildings hold significant amounts of embedded carbon—the emissions generated during the production and construction of materials. Demolishing a building not only wastes these materials, but also wastes the carbon investment that was made at the time. As Nick Millican explains, keeping structural frameworks intact allows developers to retain embodied carbon while still upgrading buildings to meet modern standards.
- Lower Carbon Emissions: The proof of the pudding is in the eating: retrofitting an existing building emits 50-75% less carbon than constructing a new one of the same size. Because reusing foundational elements such as walls and roofs eliminate the emissions associated with manufacturing and transporting new materials, “building less” by using what’s already there is one of the most effective climate strategies.
- Operational Carbon Reduction: It’s a misconception that older buildings are hopelessly doomed to being forever inefficient when it comes to energy consumption. In fact, modern retrofits often achieve energy performance comparable to new builds when systems like the HVAC and lighting are upgraded. Tenants and property owners alike can benefit from the reduced carbon footprint as a result.
- Reducing Waste: As one of the largest contributors to global waste, the construction industry has huge strides it needs to make in order to meet sustainability goals. Refurbishment diverts up to 90% of a building’s materials from landfills. Millican points out that Greycoat, even during extensive renovations that may leave little more than the facade, the primary goal remains preserving as much of the structural frame as possible.
- Immediate and Scalable Impact: Pressing climate deadlines have made time a critical factor, and refurbishment inevitably offers faster results than new builds. In addition to this, the sheer scale of existing structures—over 70% of today’s buildings are expected to still be standing in 2050—refurbishment provides a huge opportunity for carbon reduction.
We often view construction as a symbol of progress; a way to build bigger and better to meet the demands of a growing society. This perspective will need to shift in the near future if we want to reach the sustainability goals that have been set in place at a global level. Refurbishment turns the property development industry’s problem into an opportunity for becoming a pioneer in rethinking how we think about carbon reduction and waste.
Greycoat, for their part, have created an environmental impact strategy with a key focus on reducing embodied carbon and operational energy. For each new project they begin, carbon budgets are treated with the same level of rigor and importance as financial analyses or cost plans, and every design decision is evaluated through the lens of long-term sustainability and carbon reduction. Millican is optimistic that others in their industry will soon follow suit. “I think we’ll see over time more and more focus on retention and refurbishment rather than demolition and rebuild,” he said.
