A complete scope 3 consulting project covers 5 phases: a screening of the 15 GHG Protocol categories, data collection with supplier engagement, emissions calculation and hotspot analysis, targets and a reduction roadmap, and reporting that meets CSRD and CDP requirements. Data collection usually takes the most time and decides how reliable the results are.
Scope 3 emissions are, for most organizations, the biggest and most complex piece of their carbon footprint. They span everything outside your direct operations — from the raw materials your suppliers extract to how customers eventually dispose of your products. That breadth is exactly what makes a well-structured scope 3 consulting project so valuable.
Without a clear plan for what the work should actually cover, it’s easy to end up with incomplete data, missed hotspots, and a report that doesn’t hold up to scrutiny. So what should a solid scope 3 consulting engagement actually include? Whether you’re running a value chain emissions assessment for the first time or looking to sharpen an existing approach, here’s what good scope 3 consulting work looks like from start to finish.
Mapping Your Full Scope 3 Emissions Landscape
Before any numbers get crunched, a scope 3 project needs to establish what’s actually in scope. The GHG Protocol defines 15 categories of scope 3 emissions, covering everything from purchased goods and services to business travel, employee commuting, and end-of-life treatment of sold products. Not all of them will be material for every organization, but the first job is to assess which ones are.
This screening phase typically involves reviewing your business model, spend data, and supply chain structure to identify which categories are likely to represent the most significant emissions. It’s a bit like drawing a map before you start a road trip — skipping it means you might spend a lot of effort heading in the wrong direction. A thorough landscape assessment sets the foundation for everything that follows and ensures the project doesn’t miss the emissions that actually matter.
Once you know which categories are in play, the next challenge is figuring out how to measure them — and that’s where data collection becomes the critical piece of the puzzle.
Data Collection Methods and Supplier Engagement
With the relevant categories identified, the real work begins: gathering the data to quantify them. This is often the most time-consuming part of any scope 3 project, and the approach varies significantly depending on what’s available.
Common data collection methods include:
- Spend-based estimation – Using financial spend data combined with industry-average emission factors. It’s a practical starting point when supplier-specific data isn’t available, though it’s less precise.
- Activity-based data – Collecting actual quantities (tonnes of materials purchased, kilometres travelled, etc.) and applying relevant emission factors. More accurate, but requires more effort to gather.
- Supplier-specific data – Asking suppliers directly for their product-level or company-level emissions data. This is the gold standard for accuracy, and increasingly expected under frameworks like CDP and CSRD.
- Life cycle assessment (LCA) data – Drawing on existing LCA studies or commissioning new ones for specific products or materials. Particularly relevant for upstream and downstream categories.
Supplier engagement deserves its own focus here. Getting meaningful data from your supply chain requires clear communication, simple templates, and sometimes a fair bit of persistence. The quality of your scope 3 assessment is ultimately only as good as the data behind it, which is why this phase can’t be treated as an afterthought.
A well-run data collection process also builds supplier relationships that pay dividends in future reporting cycles. With solid data in hand, the focus shifts to making sense of it — and that means calculating emissions and identifying where the biggest impacts actually sit.
Emissions Calculation and Hotspot Analysis
Turning raw data into meaningful emissions figures is where the numbers start to tell a story. Calculations involve applying emission factors to the activity or spend data collected, aggregating results across categories, and expressing everything in tonnes of CO2 equivalent (tCO2e). The methodology needs to be consistent, documented, and aligned with recognized standards so the results are defensible under external scrutiny.
Hotspot analysis goes a step further by identifying which categories, suppliers, or geographies account for the largest share of emissions. For most organizations, a relatively small number of sources drive the majority of scope 3 impact. Knowing where those hotspots are is what makes the assessment actionable rather than just a reporting exercise — it’s the difference between knowing your carbon footprint exists and actually knowing what to do about it.
That clarity on where emissions are concentrated is precisely what makes the next phase possible: setting meaningful targets and building a credible plan to reduce them.
Target-Setting and Reduction Roadmap
A scope 3 assessment without a plan for what to do next is a missed opportunity. This phase translates the emissions picture into concrete commitments and actions.
Target-setting typically involves aligning with recognized frameworks. The Science Based Targets initiative (SBTi) is one of the most widely used, requiring companies to set scope 3 targets that are consistent with limiting global warming. For organizations working toward SBTi validation, scope 3 often represents the most challenging part of the commitment, since it requires influencing emissions outside your direct control.
A reduction roadmap then maps out how to get from current emissions levels to the targets set. This might include switching to lower-carbon suppliers, redesigning products to reduce material intensity, working with logistics partners on cleaner transport, or engaging customers around product use and end-of-life. The roadmap should be realistic, prioritized by impact, and tied to your business planning cycles so it doesn’t sit in a drawer gathering dust.
Of course, having a strong internal roadmap is only part of the picture — increasingly, organizations also need to demonstrate their progress to external stakeholders through formal disclosure, which brings its own set of requirements.
Reporting, Disclosure, and Compliance Considerations
Scope 3 data increasingly needs to show up in formal disclosures, and the requirements are getting more specific. Two frameworks that matter most for many European organizations right now are CSRD and CDP.
The Corporate Sustainability Reporting Directive (CSRD) requires in-scope companies to report on their full value chain emissions, including scope 3, under the European Sustainability Reporting Standards. The level of detail and assurance required is significantly higher than previous voluntary reporting, which means the underlying data quality needs to match. CDP’s questionnaire also asks detailed questions about scope 3 categories, supplier engagement, and reduction targets, with responses scored and publicly disclosed.
Beyond these, the EU Taxonomy requires companies to demonstrate that their economic activities are aligned with environmental criteria, and scope 3 data can play a role in substantiating those claims. A well-structured scope 3 project should anticipate these disclosure needs from the start, rather than trying to retrofit reporting requirements onto data that wasn’t collected with them in mind.
Meeting all of these requirements demands not just good data, but the right expertise to interpret and apply it — which is why choosing the right consultant for the job is so important.
Choosing the Right Scope 3 Consultant for Your Organization
Not all sustainability consultants approach scope 3 work the same way, and that’s actually a good thing. The field is highly specialized, and the right fit depends on what you need most.
Some consultants specialize in emissions quantification and hotspot analysis, with deep expertise in GHG accounting methodologies. Others focus on supplier engagement programs and helping organizations build data collection infrastructure across their supply chains. Some are CSRD or CDP reporting specialists who can ensure your scope 3 data meets disclosure requirements, while others bring LCA expertise that’s particularly valuable for product-level assessments.
When scoping out a consultant, it’s worth asking specifically about their experience with scope 3 projects in your sector, their familiarity with the reporting frameworks you’re working toward, and how they approach supplier engagement. A scope 3 consultant with sector expertise may have a very different toolkit than one who’s focused on manufacturing or financial services. Matching the consultant’s specialization to your actual challenge is what makes the difference between a useful project and a generic one.
Finding that right match, however, isn’t always straightforward — and that’s exactly where Dazzle can help.
Find Your Scope 3 Expert Through Dazzle
Scope 3 consulting projects cover a lot of ground, and finding someone with the right combination of technical knowledge and practical experience isn’t always easy. That’s where we come in.
At Dazzle, we match organizations with pre-screened sustainability freelancers who specialize in exactly the kind of work you need, whether that’s GHG accounting, supplier engagement, CSRD reporting, or building a reduction roadmap. Our network of 150+ experts is available on a project or interim basis, so you get the right level of support without overcommitting. And because we hand-pick matches based on your specific challenge, you’re not sifting through generic profiles hoping for the best.
If you’re ready to get started, we can connect you with a qualified scope 3 specialist within 48 hours. Reach out to our team and let’s find the right person for your project.
Building your first Scope 3 baseline?
Scope 3 in 100 Days is a free checklist in 4 phases, from spend data to a baseline you can defend. Reviewed by an independent Scope 3 expert.
