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The climate emergency is not a distant threat. It is shaping our cities, our homes and our places of work right now.

The built environment accounts for nearly 19 percent of the UK鈥檚 total carbon footprint, making it a critical player in our drive towards net zero by 2050. As Net Zero Week reminds us, time is running short to turn ambition into action and retrofit will be vital in closing the gap. Yet most of the buildings that will stand in 2050 already exist today. Demolishing them only to rebuild is not only carbon-heavy, but also economically and socially wasteful. The answer, increasingly, lies in retrofit.

We just need to shift the balance. Retrofit should not be the exception, it should be the starting point

Ethan Conlin, Associate Structural Engineer

Retrofitting is more than a technical fix. It is a fundamental rethinking of how we value and reshape the buildings around us. As Ana Araujo, Partner and UK Facades Lead at 海角视频, puts it: 鈥淎sk 20 people to define retrofit and you鈥檒l get 20 different answers.鈥� At its simplest, retrofit is about reinvesting in what we have, treating existing structures as repositories of carbon rather than as obsolete shells to discard.鈥ㄢ��

A retrofit-first mindset is gaining ground across planning departments and clients. This approach gives preference to adapting what is already there unless there is a compelling case to start from scratch. As Ana explains, 鈥淔rom this perspective, you treat every building on a case-by-case basis. It needs to be a life-cycle analysis from a pure carbon perspective.鈥� This is not only about preserving heritage, though that matters. It is about keeping carbon locked up in existing materials whilst dramatically improving operational performance.鈥ㄢ��

The urgency is clear. The Climate Change Committee warns that the UK is not on track to meet its legally binding carbon budgets, let alone the 2050 net zero target. Retrofitting existing buildings will be essential. According to the UK Green Building Council, energy use in homes alone accounts for around 16 percent of total UK carbon emissions. If deep retrofit measures are not rapidly scaled up, the UK risks missing its 2050 goal, with the consequences of a warmer, more hazardous climate borne by communities, businesses and public services alike.鈥ㄢ��

Retrofit鈥檚 role in this is immense. Every building that is retained and upgraded, rather than demolished and replaced, saves tonnes of embodied carbon. According to the Royal Institution of Chartered Surveyors, 35 to 50 percent of the whole-life carbon emissions of a new building arise before it even opens its doors, through extraction, manufacture and construction. If we fail to tackle that embodied carbon, the net zero story falls apart before it begins.鈥ㄢ��

The key to solving retrofit challenges is to reduce the energy demand of the existing building to start with, especially heating and cooling, by working with the building fabric improvement. Then we鈥檒l have a fighting chance

Kenichi Hamada, Associate Director, MEP

Retrofit also helps manage operational carbon, the emissions from running a building. In a typical commercial office, heating and cooling account for up to 40 percent of operational energy. Interventions that improve the building fabric, alongside smarter, low-energy systems, can cut those demands by as much as half. These are savings we cannot afford to ignore.鈥ㄢ��

Projects across the UK show the opportunity. At 65 Gresham Street in London, 海角视频 supported the transformation of a commercial block by adding four extra storeys whilst retaining 90 percent of the original structure, demonstrating the power of circular economy thinking.

In Manchester, Hanover House, a Grade II listed banking hall damaged in the Second World War, has been transformed into Amazon鈥檚 northern headquarters, anchoring regeneration in the NOMA district. 鈥淭hese buildings give people something familiar, a North Star,鈥� says Andrew Tabern, 海角视频 Partner and North West Lead. 鈥淵ou keep them in the fabric of the city, and you create something people feel attached to.鈥濃�ㄢ��

Retrofit protects local identity, reduces disruption and supports more inclusive and adaptable spaces. On the Manchester Jewish Museum project, a modestly resourced scheme extended and upgraded the UK鈥檚 oldest Portuguese synagogue, showing how heritage and decarbonisation can align. In Liverpool, as Andrew notes, 鈥淗otel, office, education: there鈥檚 no shortage of options. But the city needs support to unlock them.鈥濃�ㄢ�≧etrofit demands ingenuity. Constrained spaces, incomplete records and complex legacy systems mean teams must think flexibly and collaborate early.

Kenichi Hamada, Associate Director, highlights the challenges of integrating modern low-energy systems: 鈥淭he key to solving retrofit challenges is to reduce the energy demand of the existing building to start with, especially heating and cooling, by working with the building fabric improvement. Then we鈥檒l have a fighting chance.鈥濃�ㄢ��

In the North West and beyond, public policy will be decisive. National planning guidance still favours demolition, and tax rules rarely support reuse over new construction. Campaigns such as RetroFirst call for VAT relief on retrofit works to help shift the balance. As Ethan Conlin, Associate Structural Engineer, puts it: 鈥淭he North West has everything it needs. We just need to shift the balance. Retrofit should not be the exception, it should be the starting point.鈥�

Retrofit also supports climate resilience. By integrating passive design, improving daylighting, reducing cooling demand and supporting climate adaptation, retrofitted buildings can be stronger against future shocks. 海角视频鈥檚 role as a Resilience and Nature Partner with UKGBC on the UK Climate Resilience Roadmap shows how adaptation and decarbonisation go hand in hand.

Retrofit is the route to a more climate-resilient, inclusive and livable built environment. With the stakes higher than ever, there is no time to waste.

If we are serious about reaching net zero, retrofit is essential. The engineering skills, technical knowledge and creative confidence built up over decades now make it not only possible but essential. Net Zero Week puts a spotlight on this urgency, calling for bold choices that invest in what we already own rather than repeating patterns of waste. As Ana reminds us, 鈥淚nstead of demolish-and-rebuild, we invited clients to consider the option of using what they already have as a base and to go from there.鈥�

The journey to net zero is a collective one. It asks us to consider the carbon story of every building, not only the shiny new ones. It asks us to invest in what we already own, to strengthen it, and to adapt it for future generations. Retrofit is the route to a more climate-resilient, inclusive and liveable built environment. With the stakes higher than ever, there is no time to waste.

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