The UK construction sector should decarbonise more urgently in line with the national emission reduction targets of 68% by 2030 and 78% by 2035, according to a report published today by the National Engineering Policy Centre, a partnership of 43 of the UK’s professional engineering organisations led by the Royal Academy of Engineering.

Decarbonising construction: building a new net zero industrycalls on both government and the construction industry to set challenging but clear targets that will deliver the net zero transformation at pace and at scale.

More holistic and efficient building designs, combined with measures such as reusing building materials wherever possible and using non-fossil fuel powered machinery, could help to eliminate carbon emissions from building sites, says the report. The built environment, of which the construction sector is a crucial component, currently contributes some 40% of the UK’s carbon emissions and it is estimated that the construction sector contributes up to 11% of global carbon emissions. Government, as a major client of infrastructure and building projects, can play an important role by changing its approach to procurement, to reflect whole-life carbon performance.

The UK government, as part of its 10-point plan for a green industrial revolution, has stated a clear ambition to rebuild a greener economy following the COVID-19 pandemic. According to the November 2020 National Infrastructure Strategy, the construction sector is one that requires bold transformative action. This report identifies six overarching recommendations where action taken now will result in rapid decarbonisation of the construction sector:

1. The construction sector should adopt the same carbon emission reduction targets as the national targets of 68% and 78% by 2030 and 2035 respectively, compared to 1990 levels. These recommended percentage reductions should include embodied carbon of built infrastructure, including that of imported construction materials, not just the scope of emissions included in the UK carbon budget.

2. Whole-life carbon assessment should be applied to public procurement: the construction sector must apply the updated guidance for appraising environmental impacts defined in HM Treasury’s Green Book, which aims to ensure that projects are assessed in terms of their contribution to the overall net zero target. The guidance in the HMT Green Book has recently been updated so that all interventions that are aimed at moving the UK towards the net zero target are first appraised in terms of their contribution to the net zero target.

3. Current design and performance standards should be updated to enable more holistic design approaches for the built environment that support efficient design and reuse of materials. The updated standards must also ensure that all future projects, including those that are part of the economic stimulus following the COVID-19 pandemic, are obliged to contribute to meeting net zero. Infection control measures must also be integrated with energy efficiency to control health risks as the UK moves towards the net zero target.

4. Government and the construction sector must define and promote the large-scale adoption of best practices in low-carbon procurement and construction, applying it to all new build and refurbishment projects by 2025. This must be underpinned by better use of digital technologies to improve productivity and reduce risk, such as the use of digital twins.

5. Net zero and sustainability principles and practices must be a mandatory part of engineering education, continuous professional development and upskilling to change the culture of the construction industry.

6. Government should apply a joined-up, systems approach across the construction sector and across government departments to ensure that total emissions from construction are minimised. Net zero emissions will not be achieved solely by building less and retrofitting existing building stock. It instead requires a radical and comprehensive transformation across the sector encompassing the definition of outcomes sought in the procurement of infrastructure, the detailed specification and design of built infrastructure and the processes of construction, retrofit and reuse. This transformation requires new systems that are consistent and joined up across these stages of the lifecycle of built assets and will need to be coherent across national, devolved and local government, placing social, economic and environmental outcomes at their heart.

Dervilla Mitchell CBE FREng, Deputy Chair of Arup Group and Chair of the National Engineering Policy Centre Net Zero working group, says:

“The construction sector has already made real progress; the concrete and cement industry has delivered a 53% reduction in absolute CO2 emissions since 1990, faster than the UK economy as a whole. However, more still needs to be done if we are to get on track to meet the ultimate target of achieving net zero by 2050.

“We know how to do this. For example, the London 2012 Olympic Delivery Authority’s stated its aim to reduce greenhouse gas emissions by 50% compared with standard practice and used its purchasing power and prestige status to develop ‘sustainable concrete’, using recycled aggregate, batched on site to reduce both transport emissions and supply risk. This demonstrates the importance of mandating carbon reduction in ensuring that action is taken.

“The net zero transformation is challenging but it is also a massive opportunity for the sector. It’s a chance to make a fundamental change in our ambitions, processes and social contribution. However, we need immediate action by government, standards bodies, the construction sector and the engineering profession if we are to make it happen.”

Notes for Editors

1. Decarbonising construction: building a new net zero industry is available here.

The report was compiled following a virtual workshop in June 2020 involving 50 consultants, client organisations, policymakers, academics and others with expertise relating to the construction sector. The workshop focused on the transformational changes needed to achieve a low carbon-built environment and aimed to identify the principal areas for change, referred to as ‘missions’ in this report, and agree priority actions. Since the initial workshop, the output findings and recommendations have been further developed and honed, via desktop research and interviews with stakeholders, into a set of specific actions for different stakeholders, with four specific missions across the sector:

- Mission 1: product outcomes

- Mission 2: design and specification

- Mission 3: construction and re-use

- Mission 4: changes to procurement

The report was overseen by the National Engineering Policy Centre Net Zero Working Group:

Dervilla Mitchell CBE FREng (Chair), Joint Deputy Chair of Arup Group

Professor Nilay Shah FREng (Vice-Chair), Head of Department of Chemical Engineering, Imperial College London

Mark Apsey MBE, Chair, Institution of Chemical Engineers Energy Centre

Dr Jenifer Baxter, Chief Engineer, Institution of Mechanical Engineers

Professor Harriet Bulkeley FBA, Durham University

Dr Mike Cook FREng, Director, BuroHappold; Institution of Structural Engineers Sustainability Lead

Ian Gardner, Global Energy Leader, Arup

Dr Julie Godefroy, Head of Sustainability, Chartered Institution of Building Services Engineers

Professor Jim Hall FREng, University of Oxford; Vice President of the Institution of Civil Engineers

Dr Simon Harrison, Vice-President Institution of Engineering and Technology

Steve Holliday FREng, President, Energy Institute

Professor Roger Kemp MBE FREng, Lancaster University

Professor Rebecca Lunn MBE FREng FRSE, University of Strathclyde

Ian McCluskey, Head of Technical and Policy Institution of Gas Engineers and Managers

Emeritus Professor Susan Owens OBE FBA, University of Cambridge

Dr Sophie Parsons, University of Bath; Strategic Advisor Institute of Materials, Minerals and Mining

Nick Winser CBE FREng, Chair, Energy Systems Catapult

2. National Engineering Policy Centre We are a unified voice for 43 professional engineering organisations, representing 450,000 engineers, a partnership led by the Royal Academy of Engineering.

We give policymakers a single route to advice from across the engineering profession. We inform and respond to policy issues of national importance, for the benefit of society

3. The Royal Academy of Engineering is harnessing the power of engineering to build a sustainable society and an inclusive economy that works for everyone.

In collaboration with our Fellows and partners, we’re growing talent and developing skills for the future, driving innovation and building global partnerships, and influencing policy and engaging the public.

Together we’re working to tackle the greatest challenges of our age.

For more information please contact:

Jane Sutton at the Royal Academy of Engineering

T: +44 207 766 0636

E: Jane Sutton

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