Reusing Existing Structures: Sustainable Development

One of the most impactful ways we can do this is by reusing and adapting existing structures. While demolition and rebuild were once the default approach, the tide is turning. Over the past decade, there’s been a growing recognition of the value -both environmental and economic – of retaining and repurposing what we already have.

Why Reuse?

Reusing existing structures involves modifying, altering, and repurposing buildings instead of demolishing them. This approach is not new, but its importance is growing rapidly. It offers a powerful response to:

• Environmental concerns: Reducing embodied carbon and construction waste.
• Economic pressures: Mitigating rising material costs and supply chain disruptions.
• Net zero targets: Supporting the industry’s transition to a low-carbon future.

Outside of the clear sustainability advantages, reuse often provides a cost-effective alternative. With much of the structure already in place, projects can avoid the high costs of demolition and new construction. This can also lead to shorter project timescales, especially where strengthening works are not required—further contributing to cost savings.

The IStructE highlights that applying circular economy principles to structural design is a necessary step toward Net Zero. Engineers must maximise the value of materials, minimise embodied energy, and use resources sparingly—principles that are inherently supported by reuse.

The Role of the Engineer

The success of a reuse project hinges on early engagement with structural engineers. Their expertise is essential in:

• Identifying opportunities and limitations early
• Minimising the extent of strengthening works
• Ensuring safety and compliance
• Maximising the potential of the existing structure

At Brookbanks, we relish the challenge of reusing existing structures. It’s not only a key tool in reducing the carbon footprint of the construction industry—it also presents some of the most interesting and rewarding engineering problems to solve.

The Payoff: Carbon and Cost Savings

Despite the challenges, the benefits are substantial:

• Up to 70% reduction in carbon emissions compared to new builds
• 60% of a building’s embodied carbon is typically in the substructure and superstructure—areas preserved through reuse
• Aligns with IStructE’s target of reducing embodied carbon by 50% by 2030