Why Refurbishing Existing Buildings Is One of Construction’s Biggest Climate Opportunities
Sustainability in construction is often framed as a question of making new buildings more efficient. Yet some of the biggest climate gains available to the industry lie not in new construction at all, but in the decision to retain, adapt and upgrade what already exists.
Refurbishment offers an opportunity to reduce whole-life carbon while extending the useful life of building fabric that has already proven its worth.
The Carbon Value Already Locked Into Existing Buildings
Every existing building represents a substantial carbon investment. Its materials, structure and components have already incurred the emissions associated with extraction, manufacture, transport and construction, collectively known as embodied carbon.
Historic England’s research on avoiding embodied carbon makes clear that demolishing a building and replacing it with something new means incurring another full round of these emissions, often before the new structure has delivered any operational benefit at all. Retaining a building’s structure and envelope, by contrast, avoids that substantial new injection of embodied emissions entirely, which is precisely why refurbishment deserves serious consideration before demolition is treated as the default.
Refurbishment Can Tackle Operational Carbon Too
Choosing to retain a building doesn’t mean settling for its existing energy performance. Refurbishment can combine the embodied-carbon advantage of reuse with targeted measures that genuinely reduce ongoing energy consumption and operational emissions.
This works best when approached holistically, assessing the building’s fabric, services, condition, and materials such as plaster together with how the building is actually occupied and used, rather than treating individual retrofit measures in isolation. A wall upgraded without attention to ventilation, for instance, or new services installed without considering the fabric they serve, can undermine the overall performance gains a project set out to achieve.
Think Whole-Life Carbon, Not Simply Operational Efficiency
It’s tempting to assume that the most energy-efficient new building automatically represents the lowest-carbon option, but this overlooks the embodied emissions required to get there. RICS’s guidance on whole-life carbon assessment provides a framework for comparing retention, retrofit and replacement across a building’s entire life cycle, factoring in materials, maintenance and eventual end-of-life impacts alongside operational energy use.
Assessed this way, a well-executed refurbishment frequently outperforms a new build on whole-life carbon terms, even where the new building would technically operate more efficiently once complete.
Better Refurbishment Means Choosing Interventions Carefully
None of this means every retrofit measure is automatically the sustainable choice. The quantities of material used, installation quality, ongoing maintenance requirements and eventual replacement cycles all affect a project’s true embodied carbon footprint. A measure that performs well on one building may be poorly suited to another with different fabric, condition or use.
The most effective approach is one in which professionals select interventions based on the specific building in front of them, rather than defaulting to maximum intervention, assuming that more work automatically yields better outcomes.
