Carbon Scopes for construction: what contractors, developers and suppliers need to know
Article
Published on 15/10/2025
As the construction industry faces growing pressure to decarbonise, terms like Scope 1, 2, and 3 emissions are increasingly appearing in documents, such as:
- Tenders
- Environmental, social, and governance strategies
- Client briefs
But what exactly do these Scopes – or categories – of emission mean? And how do they apply to contractors, developers, and suppliers?
Let’s break it down in plain language, with real-world construction examples, and explain why it matters to your role.
Let’s break it down in plain language, with real-world construction examples, and explain why it matters to your role.
1. Scopes 1, 2 and 3 – the background
Construction sector companies emit carbon into the environment from various sources, including the use of many traditional building materials, such as cement, bricks, and glass. This combines with oxygen in the air to form a gas called carbon dioxide, which often goes by its chemical name of CO₂.
Carbon dioxide, along with the likes of methane and nitrous oxide, is one of the greenhouse gases, so-called because they increase the earth’s warmth. They do this by effectively forming a layer in the atmosphere, sealing in much of the heat the planet receives from the sun.
Some of this insulation is essential, because if greenhouse gases didn’t exist, the earth’s average temperature would be around minus 18 degrees Celsius. Life as we know it, including probably mankind, would be impossible. But you can have too much of a good thing.
Emissions caused by modern human existence mean there’s now much more greenhouse gas (GHG) in the atmosphere than in previous eras. That means our planet is becoming significantly warmer. This is creating a real risk that already evident disastrous results – like land being submerged by rising seas, floods, and famines – will become commonplace.
The construction sector is responsible for about 40 per cent of all global GHG emissions, making it easily the biggest single industrial offender. There’s therefore clearly a massive onus on the sector to change its ways and decarbonise quickly.
Carbon dioxide, along with the likes of methane and nitrous oxide, is one of the greenhouse gases, so-called because they increase the earth’s warmth. They do this by effectively forming a layer in the atmosphere, sealing in much of the heat the planet receives from the sun.
Some of this insulation is essential, because if greenhouse gases didn’t exist, the earth’s average temperature would be around minus 18 degrees Celsius. Life as we know it, including probably mankind, would be impossible. But you can have too much of a good thing.
Emissions caused by modern human existence mean there’s now much more greenhouse gas (GHG) in the atmosphere than in previous eras. That means our planet is becoming significantly warmer. This is creating a real risk that already evident disastrous results – like land being submerged by rising seas, floods, and famines – will become commonplace.
The construction sector is responsible for about 40 per cent of all global GHG emissions, making it easily the biggest single industrial offender. There’s therefore clearly a massive onus on the sector to change its ways and decarbonise quickly.
2. How the Scopes originated
The Scopes developed from the concept that each business has a carbon footprint. This is effectively simply the amount released into the atmosphere due to the company’s activities.
Some people have pointed out that the phrase “carbon footprint” is a misnomer. This is because footprints should technically cover all the GHGs for which organisations are responsible, not just carbon. But about 75 per cent of all such emissions globally, and probably an even higher percentage in construction, are in this form. The term is therefore largely accurate.
The idea of carbon footprints became widely accepted in the late 1990s and early 2000s. But it soon became obvious there were potentially any number of ways in which these could be measured and expressed. This is partly because the concept can be applied to countries, governments, local communities, and even individuals, as well as businesses.
Some standardising therefore had to be introduced in footprint calculating and reporting worldwide, to ensure like-for-like comparisons could be made.
Accordingly, the World Resources Institute and World Business Council for Sustainable Development teamed up in 2001, to develop the GHG Protocol. This provides a blueprint that businesses can use to account for and manage their emissions.
Detailed and comprehensive, the protocol supplies extensive guidance, tools, calculation methods, and reporting frameworks. These apply to numerous organisation types, industries, sources, and activities.
The protocol is based on principles such as:
Some people have pointed out that the phrase “carbon footprint” is a misnomer. This is because footprints should technically cover all the GHGs for which organisations are responsible, not just carbon. But about 75 per cent of all such emissions globally, and probably an even higher percentage in construction, are in this form. The term is therefore largely accurate.
The idea of carbon footprints became widely accepted in the late 1990s and early 2000s. But it soon became obvious there were potentially any number of ways in which these could be measured and expressed. This is partly because the concept can be applied to countries, governments, local communities, and even individuals, as well as businesses.
Some standardising therefore had to be introduced in footprint calculating and reporting worldwide, to ensure like-for-like comparisons could be made.
Accordingly, the World Resources Institute and World Business Council for Sustainable Development teamed up in 2001, to develop the GHG Protocol. This provides a blueprint that businesses can use to account for and manage their emissions.
Detailed and comprehensive, the protocol supplies extensive guidance, tools, calculation methods, and reporting frameworks. These apply to numerous organisation types, industries, sources, and activities.
The protocol is based on principles such as:
- Relevance
- Completeness
- Consistency
- Transparency
- Accuracy
Its content applies at three levels:
- Organisational
- Project
- Validating and verifying
The protocol covers every key process in GHG emission measurement and disclosure:
- Planning
- Identifying
- Calculating
- Verifying
- Reporting
Embedding flexibility, the protocol permits adaptation to the context and aims of each project or organisation, while encouraging stakeholder engagement and continuous improvement.
These qualities help explain why the protocol is now by far the most widely used and referenced tool of its type worldwide. Its users include leading voluntary and mandatory reporting programmes, initiatives and platforms, like the Science Based Targets Initiative, Carbon Disclosure Project, and Global Reporting Initiative.
These qualities help explain why the protocol is now by far the most widely used and referenced tool of its type worldwide. Its users include leading voluntary and mandatory reporting programmes, initiatives and platforms, like the Science Based Targets Initiative, Carbon Disclosure Project, and Global Reporting Initiative.
3. What are carbon Scopes?
The GHG Protocol introduced the idea that an organisation’s carbon footprint contains up to three Scopes, or kinds, of emission. The thinking is therefore that if you measure all the relevant ones accurately, you’ll have your complete picture.
These Scopes are also designed to clarify who’s responsible for what, when it comes to measuring and reducing carbon.
We’ll now cover those Scopes in detail.
These Scopes are also designed to clarify who’s responsible for what, when it comes to measuring and reducing carbon.
We’ll now cover those Scopes in detail.
4. Scope 1: Direct emissions you create
Scope 1 covers emissions arising directly from your own operations – where you burn fuel or run equipment that releases greenhouse gases.
- Diesel used in excavators, loaders, cranes, and generators.
- Gas used in on-site boilers, space heaters or asphalt production.
- Company-owned vehicles, like vans or lorries.
- Contractors operating plant on-site.
- Developers with owned fleets or temporary energy systems.
- Suppliers running manufacturing equipment on-site.
- Scope 1 is often the easiest to measure.
- It’s tied to operational efficiency and fuel use, so reducing it saves money too.
- Switch to electric or hybrid machinery.
- Use low-carbon and sustainable fuels, made from renewable ingredients, like hydrotreated vegetable oil (HVO) or bio-propane (BioLPG). HVO is a paraffinic diesel fuel, made from vegetable oils and animal fats. BioLPG is a liquid gas, produced from biological feedstocks like agricultural residues, food waste, and other organic matter.
- Reduce equipment idling and track usage with telematics. This is technology that combines telecommunications and informatics, to collect and transmit data from vehicles and other assets.
5. Scope 2: Indirect energy you purchase
Scope 2 includes emissions from the electricity, steam, heating or cooling you buy and use. This is despite these emissions being produced off-site.
- Electricity to power site cabins, cranes, and lighting.
- Heating and cooling for site accommodation or prefabricated building factories.
- Office energy consumption.
- Contractors managing temporary site power.
- Developers with permanent offices or sales suites.
- Suppliers using electricity-intensive manufacturing processes.
- Moving to renewable energy is one of the simplest ways to decarbonise.
- Reducing energy demand also cuts costs.
- Use green electricity tariffs, with Renewable Energy Guarantee of Origin or equivalent certification.
- Install light emitting diode lighting, smart meters and battery storage.
- Schedule high-energy operations during low-carbon grid periods (where possible).
6. Scope 3: All other indirect emissions
Scope 3 covers all other relevant emissions: those not directly under your control but coming from your wider value chain.
This scope brings into play the materials you use, the subcontractors you hire, and even what happens to your building after it’s completed.
Key Scope 3 categories for construction are:
This scope brings into play the materials you use, the subcontractors you hire, and even what happens to your building after it’s completed.
Key Scope 3 categories for construction are:
| Category | Examples |
|---|---|
| Materials (embodied carbon) | Steel, concrete, glass, timber, plasterboard. |
| Transport | Supplier deliveries, waste removal, worker commuting. |
| Waste | Construction and demolition waste sent to landfill. |
| Subcontractor emissions | Plant and fuel use by subcontractors not owned by you. |
| Business travel | Site visits, flights, hotel stays. |
| Downstream use | Future operational energy use of the buildings you construct. |
7. The Scopes: summary
There are therefore essentially two types of carbon an organisation can calculate. The first relates purely to its own operations, while the second is wider, extending to direct and indirect emissions throughout its value chain.
Many organisations have historically restricted their disclosures to Scope 1 and 2 emissions. This is partly explained by Scope 3 often being harder to calculate.
But Scope 3 emissions are where construction gets serious. That’s because these generally account for a higher percentage of an organisation’s carbon footprint than the other two categories. This omission has therefore led to allegations of companies greenwashing – seeking to boost their environmental reputations without justification – by deliberately understating their levels of emission.
So now, bodies like central governments, regulators, and local authorities are increasingly insisting that businesses include Scope 3 emissions in their disclosures. It’s overwhelmingly likely this tightening of rules and procedures will only accelerate in the future.
Many organisations have historically restricted their disclosures to Scope 1 and 2 emissions. This is partly explained by Scope 3 often being harder to calculate.
But Scope 3 emissions are where construction gets serious. That’s because these generally account for a higher percentage of an organisation’s carbon footprint than the other two categories. This omission has therefore led to allegations of companies greenwashing – seeking to boost their environmental reputations without justification – by deliberately understating their levels of emission.
So now, bodies like central governments, regulators, and local authorities are increasingly insisting that businesses include Scope 3 emissions in their disclosures. It’s overwhelmingly likely this tightening of rules and procedures will only accelerate in the future.
8. How do Scopes apply to your role?
We mentioned earlier three common construction sector roles – contractors, developers and suppliers. Here are some actions you can take to improve your performance over Scope 1, 2, and 3 emissions if you perform one of these functions:
- Track and reduce Scope 1 emissions on-site.
- Use renewable energy to reduce Scope 2.
- Start collecting Scope 3 data from your materials, logistics, and subcontractors.
- Use your design and procurement influence to reduce Scope 3 emissions.
- Embed whole life carbon targets into your project briefs.
- Lead the charge in demanding transparency across your supply chain.
- Provide environmental product declarations (EPDs) and emission data for your products. EPDs are transparent, independently verified documents that communicate the environmental impact of goods throughout their lifecycles.
- Invest in cleaner manufacturing processes.
- Reduce transport-related emissions with local supply chains or greener fleets.
9. Quick comparison table:
| Scope | Responsibility | Common construction examples |
|---|---|---|
| Scope 1 | Direct control | Diesel generators, company vehicles. |
| Scope 2 | Indirect (from energy use) | Grid electricity, cabin heating, ventilation and air conditioning. |
| Scope 3 | Indirect (value chain) | Materials, waste, transport, future energy use. |
10. Final thoughts
Understanding your Scope 1, 2, and 3 emissions is no longer just a sustainability box-tick – it’s a strategic necessity. This is because:
No matter your size or role in the construction ecosystem, you have a part to play. And the earlier you start tracking and improving, the better positioned you’ll be.
See how our tools such as the carbon calculator software for construction and carbon reporting software for construction can help your business today.
