Decarbonisation Schemes


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Our expert Decarbonisation Schemes team, led by Harriet and Reece, are here to help.
Our team at BSE 3D have extensive experience in decarbonisation schemes, both as part of wider refurbishment works in existing buildings and as stand alone projects. The majority of buildings that will be in use in 2050 already exist. By carrying out decarbonisation schemes, we help our clients reduce their building’s carbon footprint to help meet the net zero carbon 2050 target. While we design new low to zero carbon (LZC) buildings, the industry must also focus on decarbonising the existing building stock. Our experienced team achieve this by working on retrofit decarbonisation projects with our clients.
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Retrofit decarbonisation involves reducing the CO2 emissions from existing buildings. The purpose of this is to reduce carbon emissions, but also reduce a building’s reliance on fossil fuels. This is achieved through fabric enhancements (external walls, floors, roof, windows and doors) and MEP service upgrades.
Fabric upgrades reduce heat losses from buildings. Additionally, these upgrades help to reduce solar gain and therefore a room or building’s cooling load. This makes the building more efficient because by reducing heat loss, less heat input is needed and the heat you do produce/input stays in the property longer. MEP upgrades look to deliver this heat in an efficient way that uses less energy compared to the standard gas boiler system. MEP upgrades can also look at microgeneration of electricity to offset or reduce the carbon intensity of the electricity used in the property.
Using industry recognised and state of the art software, our engineers create thermal models to support architects and clients to reduce their existing building loads.
Retrofit Decarbonisation Project Process
During a retrofit decarbonisation project our team will work with the client to:
- Analyse the existing property.
- Review fabric enhancement options.
- Review different LZC/renewable options and technology in the marketplace to find a sustainable, carbon emission reducing solution.
- Produce a concept design report and associated sketches to analyse the most suitable system.
- Demonstrate the carbon emissions savings impact the chosen options have.
- Review any applicable Government/Ofgem Environmental and Social Schemes which could offer one off or on going monetary benefits
- Produce a detailed design of the agreed MEP design strategy.
- We can monitor the installation during the construction stage and provide technical assistance.
- We can produce Part L compliance documentation to demonstrate the achieved CO2 savings at the end of the project.
Project Experience
Our engineers have worked on retrofit decarbonisation schemes across a variety of projects both residential and commercial to different RIBA stages:
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Integration of air source heat pumps (ASHPs) into the refurbished heating and domestic hot water system to provide an efficient hybrid system to serve the Grade II listed Leonardslee House. The hybrid system approach would increase the system efficiency across the year and reduces costs compared to the fossil fuel only heating and hot water system.
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Recent Projects
Our Decarbonisation & Net Zero Consultants
Led by Harriet, Reece and Phil, our expert team of decarbonisation and net zero consultants brings experience, technical expertise and valued advice to every project.


Harriet Morphew
Electrical Engineer
Harriet Morphew
Harriet is an Incorporated Engineer with a 1st class degree in Building Services Engineering from London Southbank University. Having completed her degree apprenticeship with BSE3D she has experience across all the disciplines and now helps to mentor more junior engineers and work placement students.
Although her bias is in electrical engineering, Harriet is passionate about the climate crisis and so focusses on energy efficiency through engineering design to reduce carbon emissions on her projects and is involved with the Part L carbon emission compliance on many of our schemes. Harriet has experience in various sectors across the UK and Middle East including data centres, schools, offices, hotels and both large- and small-scale residential projects.
Harriet is a STEM Ambassador and works with schools to promote building services careers and women in engineering using resources from the Chartered Institute of Building Services Engineers (CIBSE) where she is an Associate Member and from the Women’s Engineering Society (WES) where she is a Member. In her spare time, Harriet enjoys practicing martial arts with her family and is training for her next black belt promotion!


Reece Onslow-Dewey
Mechanical Engineer
Reece Onslow-Dewey


Philip Todd
Managing Director
Philip Todd
Phil is a Chartered Engineer with a degree in Energy Engineering from London Southbank University. He has a genuine passion for engineering and was awarded an industry prize for the ‘Graduate of the Year’ competition. He combines his academic knowledge with an exceptional work efficiency, drawing upon work ethics that can only be gained through years of experience and hard work within the industry itself. Phil sets the mark for high standards and completion of projects through an upstanding view of a better and more sustainable future.
Having always been enthusiastic about energy efficiency and engineering, Phil has held positions within the Chartered Institute of Building Services Engineers (CIBSE) Council for over 15 years and has given presentations on Low Carbon developments, Building Information Modelling and Planning as well as design services and management. Phil has worked in five continents and in every market sector winning awards for innovative design and exemplar projects. Key Clients and Projects that have profited from Phil’s involvement include British Airways, Shell, BT, Savoy Hotel, Barclays Bank, County Hall – London, Grange Hotels, Intercontinental Hotels, Volvo, Rolls Royce, Bupa, Tesla, Jamie Oliver, Hammerson and Whitbread.
Phil is a Director/Governor for a local High School and keeps fit and active through a wide array of different sports and charity events.
Talk to Our Expert Team
Our expert team of building services consultants are here to help. If you would like to learn more about the range of services we offer, please get in touch for an informal discussion about your needs and requirements.