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Personal profile

Research interests

Dr. Stephen Allen is a lecturer and engineer working in the fields of whole life carbon, life cycle assessment (LCA) and energy-systems analysis.  His research focuses on radically reducing the carbon footprint of the built environment, by tackling both embodied and operational emissions.  Current collaborative projects include:

Stephen has professional experience in both policy and commercial environments. During 2010-12 he worked as the Scientific Adviser on Energy at the Parliamentary Office of Science and Technology (POST), informing and influencing energy and climate policy. In 2012-18 he was a senior consultant at Sustain and then director at Circular Ecology. He led projects for companies with turnovers greater than £10bn to measure and reduce the environmental footprint of buildings, rail transport and consumer products. He has also worked as an engineer in remote parts of Canada and Mexico, designing and building equipment and accommodation to support field research.

His publications have been used by parliament, government and the Committee on Climate Change to inform policy, and by professional magazines to influence practice in industry.  He has won the prestigious George Stephenson Medal from the Institution of Mechanical Engineers (for best original paper), and a place on the USA’s International Visitor Leadership Programme on climate change and renewable energy.  He is conversationally fluent in Spanish.

Willing to supervise doctoral students

Interested in supervising students studying:

  • Low energy and low carbon design of buildings
  • Sustainable building materials
  • Sustainable energy technologies
  • Thermodynamics and heat transfer
  • Carbon footprinting
  • Life cycle assessment

External positions

Member of Engineering Early Career Forum, Engineering and Physical Sciences Research Council


Director - Energy and Environment, Circular Ecology Ltd.


Senior Associate - Energy and Environment, Sustain Ltd


Scientific Adviser - Energy, Parliamentary Office of Science and Technology


Research Officer, SUPERGEN Highly Distributed Power Systems, University of Bath


Mechanical Engineer (Canada and Mexico), Coastal Ecosystems Research Foundation



  • Sustainable energy
  • Renewable energy
  • Thermodynamics
  • Heat transfer
  • Carbon footprinting
  • Energy analysis
  • Life cycle assessment
  • Embodied energy and carbon
  • Building performance analysis
  • TA Engineering (General). Civil engineering (General)
  • TJ Mechanical engineering and machinery

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Research Output

Indicative appraisal of clustered micro-generators for a low-carbon transition in the UK building sector

Allen, S., Cohen, B. & Hammond, G., 10 Jul 2020, In : Global Transitions. 2, p. 83-97 15 p.

Research output: Contribution to journalArticle

Open Access

Review of Energy Policy, 2019

Watson, J., Bradshaw, M., Froggat, A., Kuzemko, C., Webb, J., Beaumont, N., Armstrong, A., Agnolucci, P., Hastings, A., Holland, R., Day, B., Delafield, G., Eigenbrod, F., Taylor, G., Lovett, A., Sherpard, A., Hooper, T., Wu, J., Lowes, R., Qadrdan, M. & 6 others, Anable, J., Brand, C., Mullen, C., Bell, K., Taylor, P. & Allen, S., 31 Dec 2019, December 2019 ed. UK Energy Research Centre (UKERC). 16 p.

Research output: Book/ReportCommissioned report

Open Access
Open Access
82 Downloads (Pure)
Open Access
  • 82 Downloads (Pure)


    Embodied energy and embodied carbon of 81 shelters globally

    Kuchai, N. (Creator), Matard, A. (Creator), Coley, D. (Creator), Allen, S. (Creator), Allen, S. (Creator), University of Bath, 16 Sep 2019



    Micro-generation for UK Households: Thermodynamic and Related Analysis

    Author: Allen, S., 1 Jun 2009

    Supervisor: Hammond, G. (Supervisor)

    Student thesis: Doctoral ThesisPhD