The Founder Series: Embodied Carbon vs Operational Carbon in Office Interiors: What Is the Difference and Why Does It Matter?
By James Piggott | Founder At Fenway®
QUICK SUMMARY: If you are engaged with sustainability in your organisation or if you are planning an office fit-out, refurbishment or retrofit with environmental objectives, you will encounter the terms embodied carbon and operational carbon. They are used with increasing frequency in the built environment sector but they are not always clearly explained and the distinction between them is important. This article defines both terms clearly, explains their relevance to office interior projects and sets out practical steps for addressing each in your fit-out or refurbishment.
What Is Operational Carbon?
Operational carbon refers to the carbon dioxide emissions generated by the energy used to run a building during its occupation.
In the context of an office, this includes the energy consumed by heating, cooling, ventilation, lighting, plug loads and all other operational systems over the lifetime of the building's use.
Operational carbon has historically been the primary focus of building energy regulation and sustainability certification. The drive to improve the energy efficiency of buildings through better insulation, more efficient mechanical and electrical systems, LED lighting and smart controls has been largely directed at reducing operational carbon.
In the context of an office fit-out, the design choices that most directly affect operational carbon include the specification of lighting systems and controls, the efficiency and zoning of heating and cooling systems, the thermal performance of partitioning and glazing and the energy consumption of equipment and appliances.
What Is Embodied Carbon?
Embodied carbon refers to the carbon dioxide emissions associated with the materials and construction processes used to create a building or fit-out.
It includes emissions from the extraction and processing of raw materials, the manufacturing of products, transportation, construction activity and, at the end of life, demolition and disposal.
Embodied carbon is sometimes described as the upfront carbon cost of a building or fit-out because the emissions are largely locked in at the point of construction rather than spread across the operational life of the space.
In the context of an office fit-out, embodied carbon is generated by every material specified, including steel, concrete, glass, timber, carpet, plasterboard, acoustic panels and furniture. The manufacturing processes behind these materials, the distances they travel to reach site and what happens to them at the end of their useful life all contribute to the embodied carbon total.
Why the Distinction Matters
Until relatively recently, the built environment sector focused almost exclusively on operational carbon.
The logic was straightforward: buildings have long operational lives, so reducing the energy they consume over decades has a large cumulative impact.
However, as operational energy efficiency has improved and as the electricity grid has decarbonised, the relative importance of embodied carbon has grown. Analysis from the World Green Building Council and others suggests that, for new buildings and fit-outs with modern energy-efficient systems, embodied carbon can represent 50 per cent or more of the total lifetime carbon impact of the project.
For office fit-outs specifically, the picture is even more pronounced. A well-designed, energy-efficient Cat B fit-out in a modern building may have modest operational carbon. But the specification of new partitioning, new flooring, new furniture and new ceiling systems generates embodied carbon at the point of construction that cannot be recovered through operational efficiency alone.
This is why a genuinely sustainable approach to office interiors requires attention to both operational and embodied carbon, not just one or the other.
The Carbon Hierarchy in Practice
The most effective framework for addressing both forms of carbon in an office project is the carbon hierarchy, which prioritises actions in the following order:
Retain and reuse
The lowest embodied carbon option is always to retain what already exists.
Before specifying new materials or systems, consider what can be retained, repurposed or refurbished in place.
Existing partitioning, ceiling tiles, flooring and furniture all have embodied carbon already locked in.
Retaining them avoids the embodied carbon of replacement and the disposal carbon of demolition.
Specify responsibly
Where new materials are required, specify products with lower embodied carbon.
This means prioritising materials with high recycled content, products manufactured with renewable energy, materials with short supply chains and products with credible Environmental Product Declarations (EPDs) that allow their carbon impact to be verified and compared.
Minimise waste
Construction waste represents embodied carbon that has been expended with no benefit.
Careful design, accurate ordering and responsible site management all reduce waste and therefore embodied carbon.
Offset residual impacts
Where embodied carbon cannot be eliminated, offsetting through credible schemes is an option.
However, offsetting should be a last resort rather than a primary strategy. The hierarchy prioritises reduction over compensation.
Practical Implications for Your Office Fit-Out
The following are specific, practical steps you can take to address both embodied and operational carbon in your Central London office project.
Operational carbon
• Specify LED lighting throughout with occupancy and daylight sensors
• Zone your heating, cooling and ventilation systems to avoid conditioning unoccupied spaces
• Specify energy-efficient appliances and equipment
• Consider the thermal performance of your partitioning system, particularly where you are separating conditioned and unconditioned zones
• Commission all mechanical and electrical systems properly and train your facilities team to operate them efficiently
Embodied carbon
• Retain as much of the existing fit-out as possible, including ceiling systems, raised floors and partitioning where they meet your layout requirements
• Specify carpet and flooring with high recycled content and credible environmental certifications
• Choose furniture from manufacturers who publish Environmental Product Declarations and use sustainable or recycled materials
• Specify partitioning systems that are demountable and reusable rather than fixed and destructive to remove
The Role of Measurement
You cannot manage what you do not measure.
An increasing number of organisations commissioning office fit-outs in London are requesting whole-life carbon assessments as part of the design process.
These assessments quantify both the embodied and operational carbon of the proposed fit-out, allow alternative specifications to be compared on a carbon basis and provide a baseline against which future performance can be measured.
Whilst whole-life carbon assessment is not yet a regulatory requirement for office fit-outs in the UK, it is increasingly expected by organisations with formal net zero commitments and is likely to become more prevalent as carbon reporting requirements tighten.
Talking to Fenway® About Sustainable Specification
Sustainability is central to how we work at Fenway®.
We consider the embodied and operational carbon implications of our specification choices on every project and we support our clients in making informed decisions about materials and systems that balance environmental performance with budget, programme and aesthetic requirements.
If you would like to discuss the sustainability credentials of your next office project, we would be glad to talk.
Contact us at https://www.fenway.london/contact-us
Please note: Fenway® is a specialist sustainable office interiors company serving Central London. This article is provided for general information. Carbon assessment methodology is a specialist field and we recommend engaging a qualified sustainability consultant for formal carbon reporting requirements.