Scope 3 Emissions in Construction: Why They Matter and How to Calculate Them
Article
Published on 27/05/2026
It’s now widely accepted that companies should monitor their carbon footprints – the total emissions for which they’re responsible – continually or at least regularly.
It’s also generally acknowledged that doing so fully and accurately involves calculating emissions of up to three types, or scopes:
- Scope 1 encompasses those arising directly from a business’s own operations – where it burns fuel or runs equipment releasing the gas.
- Scope 2 covers emissions produced by the electricity, steam, heating or cooling a firm buys and uses.
- Scope 3 encapsulates all others. These include those from an organisation’s value chain which it doesn’t control, as they’re managed directly by others, but over which it has some influence.
Of these, scope 3 is by far the most significant numerically. It’s common for 85 to 90 per cent of a construction industry company’s emissions to be in that category. Yet it’s also the hardest of these divisions to understand and quantify. The UK Green Building Council thus says, tactfully, its evidence indicates “a limited grasp” of the topic in the sector.
These factors have led to restricted scope 3 reporting, with many businesses deliberately calculating only carbon in the other two categories. This omission has led to allegations of greenwashing – firms seeking to boost their environmental reputations unjustly by deliberately understating their emission levels.
Also, where assessing organisations do include scope 3, the category’s slight complexities mean they often identify relevant activities poorly or produce incorrect results, for example.
The crucial upshot of all this is, very often, opportunities to reduce emissions substantially are being missed.
But time’s now rapidly running out for construction industry companies to get their acts together. Authorities they must or should obey are increasingly insisting businesses include accurate scope 3 emission figures in the disclosures they demand. And it’s overwhelmingly likely this tightening of requirements will only accelerate in the future.
There are very sound commercial reasons why measuring and reducing scope 3 carbon is advisable too.
In this post, we’ll therefore explain how the scope 3 concept arose. We’ll also set out why firms should quantify the carbon of this type they produce, whether they’re required to or not. We’ll then outline the types of building sector emission the scope embraces and provide guidance on how to do the calculating and interpreting. Finally, we’ll tell you briefly how our tools make these tasks much easier.
These factors have led to restricted scope 3 reporting, with many businesses deliberately calculating only carbon in the other two categories. This omission has led to allegations of greenwashing – firms seeking to boost their environmental reputations unjustly by deliberately understating their emission levels.
Also, where assessing organisations do include scope 3, the category’s slight complexities mean they often identify relevant activities poorly or produce incorrect results, for example.
The crucial upshot of all this is, very often, opportunities to reduce emissions substantially are being missed.
But time’s now rapidly running out for construction industry companies to get their acts together. Authorities they must or should obey are increasingly insisting businesses include accurate scope 3 emission figures in the disclosures they demand. And it’s overwhelmingly likely this tightening of requirements will only accelerate in the future.
There are very sound commercial reasons why measuring and reducing scope 3 carbon is advisable too.
In this post, we’ll therefore explain how the scope 3 concept arose. We’ll also set out why firms should quantify the carbon of this type they produce, whether they’re required to or not. We’ll then outline the types of building sector emission the scope embraces and provide guidance on how to do the calculating and interpreting. Finally, we’ll tell you briefly how our tools make these tasks much easier.
How scope 3 originated
The concept of carbon footprints became widely accepted in the late 1990s and early 2000s.
But it soon became apparent some standardising in assessing and reporting these metrics worldwide would be beneficial.
That would ensure comparisons could be made between separate firms’ current performances and individual companies’ present and past results, for example.
Accordingly, the World Resources Institute and World Business Council for Sustainable Development teamed up in 2001, to develop the Greenhouse Gas (GHG) Protocol.
This document introduced and defined those three scopes. In addition to classifying all emissions comprehensively, these divisions clarify who’s responsible for what, in the footprint measuring and reducing process.
Today, the protocol is by far the most widely used and referenced tool of its type worldwide.
That would ensure comparisons could be made between separate firms’ current performances and individual companies’ present and past results, for example.
Accordingly, the World Resources Institute and World Business Council for Sustainable Development teamed up in 2001, to develop the Greenhouse Gas (GHG) Protocol.
This document introduced and defined those three scopes. In addition to classifying all emissions comprehensively, these divisions clarify who’s responsible for what, in the footprint measuring and reducing process.
Today, the protocol is by far the most widely used and referenced tool of its type worldwide.
Why quantify scope 3?
Aside from the obvious environmental benefits, there are multiple reasons why construction industry firms should calculate, then demonstrably reduce, their scope 3 emissions.
Perhaps the main ones can be categorised as “the two Cs” – compulsion and commercial benefits.
Firstly enforcement. There’s no doubt about the direction of travel here. Groups like central and local governments, regulators and sector standard setters are increasingly obliging industry businesses to assess and reveal their scope 3 emissions. Examples of relevant drivers for calculation and disclosure in the UK include compliance with:
Firstly enforcement. There’s no doubt about the direction of travel here. Groups like central and local governments, regulators and sector standard setters are increasingly obliging industry businesses to assess and reveal their scope 3 emissions. Examples of relevant drivers for calculation and disclosure in the UK include compliance with:
- Streamlined Energy and Carbon Reporting (SECR). This is already required for about 12,000 entities: quoted and large unquoted companies, plus sizeable limited liability partnerships. The regulation demands the disclosure of some scope 3 emissions. These include those from business travel in rented cars or employee-owned vehicles, for which the firm buys the fuel.
- The Global Real Estate Sustainability Benchmark. This introduced compulsory scope 3 reporting in 2018. It includes emissions from areas tenants control and the electricity they buy, plus indirectly managed assets.
- The Science Based Targets Initiative. Among other requirements, this demands a reduction target is set if an organisation’s scope 3 emissions exceed 40 per cent of its total footprint.
- CDP (formerly the Carbon Disclosure Project). Many building sector companies report annually to the CDP, with business travel and operational waste being their most widely cited sources of scope 3 emission.
Self-interested commercial reasons firms should measure and disclose their scope 3 emissions include that doing so can help them to:
- Identify emission hotspots, and therefore prioritise future reduction efforts, perhaps jointly with suppliers, customers and other partner organisations.
- Save money, by revealing opportunities to improve supply chain efficiency and cut use of resources such as materials and energy.
- Avoid allegations of greenwashing, from outsiders such as the media, environmental pressure groups and influential individuals.
- Make their companies and developments more attractive to increasingly environmentally conscious stakeholders. These can include investors, buyers, renters, suppliers and staff.
How do you do it?
Key scope 3 categories for construction industry businesses and examples of their constituents include:
| Categories | Examples |
|---|---|
| Materials | Steel, concrete, glass, timber, plasterboard |
| Transport | Supplier deliveries, waste removal, worker commuting |
| Waste | Building and demolition waste sent to landfill |
| Subcontractors | Plant and fuel use by these suppliers reporting companies don’t own |
| Travel | Site visits, flights, hotel stays |
| Downstream use | Future energy consumption in completed constructions |
Apologies, but it’s obviously impossible to give detailed guidance on accounting for all these elements and others in post such as this. Space is simply too limited.
But the good news is the process can be heavily simplified, and you don’t need to tackle it unaided.
For one thing, the GHG Protocol’s Scope 3 Evaluator Tool allows you to implement a streamlined assessment procedure in the first year. You can then move on to collect primary data – information more substantial than mere estimates or assumptions, for example – after that.
When you tackle scope 3 in earnest, you can also help yourself initially by identifying its reporting categories most relevant to your firm. The GHG Protocol identifies 15 of these that could apply, classifying them as upstream or downstream. They’re upstream where they relate to goods or services you’ve acquired, including through purchases; downstream when they cover those you’ve offloaded, such as via sales.
A further positive is many building sector organisations find all their relevant emissions fall into only nine of those 15 categories. Indeed, industry companies often discover merely three or four them account for around 80 per cent of their scope 3 total. Those nine are:
But the good news is the process can be heavily simplified, and you don’t need to tackle it unaided.
For one thing, the GHG Protocol’s Scope 3 Evaluator Tool allows you to implement a streamlined assessment procedure in the first year. You can then move on to collect primary data – information more substantial than mere estimates or assumptions, for example – after that.
When you tackle scope 3 in earnest, you can also help yourself initially by identifying its reporting categories most relevant to your firm. The GHG Protocol identifies 15 of these that could apply, classifying them as upstream or downstream. They’re upstream where they relate to goods or services you’ve acquired, including through purchases; downstream when they cover those you’ve offloaded, such as via sales.
A further positive is many building sector organisations find all their relevant emissions fall into only nine of those 15 categories. Indeed, industry companies often discover merely three or four them account for around 80 per cent of their scope 3 total. Those nine are:
- Category 1: Purchased goods and services. This includes all those you’ve bought that aren’t featured in other categories of upstream scope 3 emission.
- Category 2: Capital goods not reported as purchased items under category 1
- Category 3: Fuel and energy related activities
- Category 4: Upstream transportation and distribution. This covers third party transport of items to you from suppliers.
- Category 5: Waste generated in operations (in offices or on sites)
- Category 6: Business travel
- Category 7: Employee commuting
- Category 8: Upstream leased assets
- Category 9: Downstream transportation and distribution. That includes delivery by other firms of products from your organisation to its customers.
Please be warned, however, that this list isn’t necessarily your whole story. You should at least investigate the other six reporting categories for relevance to your company as well.
There are even more glad tidings to impart for when you’ve done this. That’s because the GHG Protocol specifies some valuable criteria for identifying your main relevant activities within the reporting categories that apply to you. Those factors are:
There are even more glad tidings to impart for when you’ve done this. That’s because the GHG Protocol specifies some valuable criteria for identifying your main relevant activities within the reporting categories that apply to you. Those factors are:
- Size. Include activities whose emissions are likely to contribute a significant proportion of your business’s scope 3 footprint.
- Influence. Prioritise sources over which you’re likely to have the most leverage in reducing emissions.
- Threat. Feature emissions contributing most to your potential carbon management risk exposure. This danger could arise through developments such as new regulation, higher supply chain costs, reduced product reliability or lower consumer demand, for example. Peril could also be enhanced via court cases against firms in your value chain. Another source of difficulty could be negative reactions from influential outside bodies or opinion formers to emission reduction efforts by your organisation or associated companies.
- Stakeholders. Cover emissions from sources important to those key stakeholder groups we mentioned earlier.
- Outsourcing. Include activities that feature in your contractors’ own scope 3 footprints.
- Sector guidance. Account for emissions identified as significant in respected guidance for the industry, such as the Royal Institution of Chartered Surveyors’ Professional Statement.
You may want to score these factors from one to 10 for each of your key activities, such as handling operational waste. This will provide an overall total for that task. You can then compare this to similar numbers for other activities, to gauge its relative importance in your scope 3 emissions.
And the help doesn’t even end there. Once you’re clear about which activities’ emissions you’re going to calculate, you can consult the Carbon Trust’s useful guide for beginners. This is called Make Business Sense of Scope 3. The guide features some practical tips on assessing and interpreting your relevant emissions. These hints include:
And the help doesn’t even end there. Once you’re clear about which activities’ emissions you’re going to calculate, you can consult the Carbon Trust’s useful guide for beginners. This is called Make Business Sense of Scope 3. The guide features some practical tips on assessing and interpreting your relevant emissions. These hints include:
- Focus on your firm’s needs and the value you can generate from the scope 3 calculation process.
- Understand what existing data you can use and how easily you can obtain additional information.
- Take an initial wide – but shallow – view, such as by simply multiplying amounts bought and sold by the most applicable emission factors. These are coefficients stating the average rates at which activities like burning fuel, making products or operating lorries release carbon into the atmosphere.
- Engage with partner organisations, including customers, to obtain primary data. This can include continually fleshing out important areas, to understand them in more detail.
- Concentrate on certain important products or categories, then simply extrapolate findings to other relevant areas.
- Ensure suppliers feel part of a team, as you work with them to improve product efficiency and meet customer needs.
- Provide findings to your company’s decision makers, so they understand how their verdicts affect the whole value chain, not just your business. You can also look at changing their key performance indicators to encourage appropriate emission-reducing choices.
How can NZC Solutions help with scope 3 emissions?
NZC Solutions can bear much of the burden in measuring, reporting and managing your scope 3 emissions too. We provide software developed specifically for construction sector firms which largely automates these activities. Our products deliver substantial benefits to organisations, in respects such as speed, automatic compliance with widely adopted reporting formats and standards, efficiency and operating costs. We supply these advantages by, for example, guaranteeing accuracy, thus removing the need for figures to be checked and re-checked manually.
If you’re not familiar with our current tools, in brief they consist of:
If you’re not familiar with our current tools, in brief they consist of:
- NZC Plus, the UK’s leading organisational carbon calculator for construction. This allows users to calculate Scopes 1, 2 and 3 with clarity, accuracy and confidence.
- NZC Plus Lite, which enables small and medium-sized industry businesses to calculate their carbon emissions with ease.
- NZC Professional, the UK’s leading construction project-based carbon reporting software. This calculates up-front embodied emissions at three stages of development. Embodied emissions are those caused by the originating, transporting, installing, maintaining and disposal of building products and materials.
- NZC Hub, the UK’s leading whole life cycle assessment embodied carbon calculator.
- NZC Live is a monitoring platform that allows users to easily manage the energy consumption and associated emissions of a completed construction project.
- NZC Market Place, an innovation enabling manufacturers and suppliers to showcase their low carbon products and materials to our customers.
See how our tools such as the carbon calculator software for construction and carbon reporting software for construction can help your business today.
