Scope 3, Done Properly. From £79 a Month.
Customers now write Scope 3 into RFPs and supplier questionnaires. Banks ask for PCAF-aligned data. CSRD, ISSB and CDP expect a method and a data quality score - not a guess.
ESG:ONE turns the spend and supplier data you already hold into an auditable footprint across all 15 GHG Protocol categories. AI factor matching, branded supplier portals, PCAF quality scoring - implementation included.
Billed annually · Implementation included · Live in about 3 weeks · 30-day pilot on your own data
Where your emissions actually sit
For most organisations the largest, most material - and least measured - emissions are the ones you do not directly control.
of total emissions typically sit in Scope 3
GHG Protocol categories, fully supported
emissions factors, AI-matched
Scope 3-only package, billed annually
Why Scope 3 Remains the Biggest Blind Spot
Despite being the largest source of emissions for most organisations, Scope 3 data is often incomplete, inconsistent and impossible to verify. Regulatory and investor pressure is making this untenable.
Supplier emissions data is scattered across emails, PDFs and manual surveys - with no centralised system for collection, validation or tracking over time
Spend-based estimates using industry averages are directionally useful but lack the granularity needed for target-setting or reduction planning
Different teams use different methodologies and factor databases for the same categories, making a consistent organisational footprint impossible
There is no systematic process for engaging suppliers, leaving procurement teams without the tools to drive decarbonisation down the value chain
Regulators like the EU (CSRD) and ISSB now require detailed Scope 3 disclosures with clear methodology descriptions and data quality assessments
Without baseline accuracy, organisations cannot set credible science-based targets or track meaningful progress on Scope 3 reductions
What You Will Actually Have, Week by Week
Not a roadmap - the deliverables that land on your screen from the day you start.
Your spend data, mapped
Upload a procurement or spend export. AI categorises every line across the 15 GHG Protocol categories and applies EEIO factors. No supplier data needed yet.
You now have:
A complete first-pass footprint - all 15 categories, with method and factor logged on every line
Suppliers in the loop
Hotspot analysis ranks what drives your number. Your branded supplier portal goes live, surveys reach the suppliers that matter, and automated reminders do the chasing.
You now have:
A ranked hotspot report and a live supplier data campaign
Live, with a defensible baseline
Typical go-live. Every figure carries a method, a matched factor and a PCAF data quality score. This is the number for the board, the bank and the next questionnaire.
You now have:
A board-ready Scope 3 baseline with a full audit trail
Estimates give way to primary data
Supplier responses and AI extraction from invoices and LCAs upgrade your biggest categories to supplier-specific data. Quality scores climb, visibly.
You now have:
CSRD, ISSB, CDP and GRI-ready exports with rising PCAF scores
Your Entire Value Chain, Mapped
Every GHG Protocol Scope 3 category - upstream and downstream - covered in one platform, with AI auto-categorisation of your spend and activity data.
Upstream
Categories 1–8Your Operations
Scope 1 & 2 direct footprint
Downstream
Categories 9–15Climb From Estimates to Primary Data
You do not have to solve Scope 3 in one step. Start with spend-based estimates today, then upgrade category by category as supplier and activity data arrives - with every data point scored against the PCAF data quality framework.
- Every figure carries a transparent data quality score
- Prioritise supplier engagement where it moves the number most
- Show auditors exactly how each category was derived
Spend-based
EEIO / indicative
Average-data
Activity x average factor
Hybrid
Blended for accuracy
Supplier-specific
Primary data - highest quality
Built for the People Who Own the Number
Scope 3 lands on three desks at once. Each one gets something concrete.
Sustainability lead
Run the programme, not the spreadsheet
- A complete all-15-category baseline in week one - no supplier data needed to start
- PCAF quality scores show exactly which category to improve next - and prove progress to anyone who asks
- CSRD, ISSB, CDP and GRI outputs generated from one dataset - calculate once, disclose everywhere
CFO / Finance
A number you can sign off
- Every figure traces to source, method and factor - assurance-ready without weeks of reconstruction
- PCAF-aligned data quality scoring - the same framework your lenders use for financed emissions
- £79 a month, billed annually, with implementation included - and a 30-day pilot before you commit
Procurement
Turn supplier chasing into a system
- Branded supplier portal with guided data entry and automated reminders - no more email threads
- AI extraction reads emissions data from the invoices and LCAs suppliers already send you
- Hotspot ranking shows which suppliers move your number most, so you engage the few that matter
Spreadsheets and Consultants vs ESG:ONE
| The old way | With ESG:ONE | |
|---|---|---|
| Baseline footprint | Months of consultant work, or a fragile spreadsheet per category - stale on arrival | Spend-based footprint across all 15 categories in your first week |
| Customer questionnaires | A scramble every time an RFP lands - dig out last year's number and hope it holds | Number, methodology and quality score on file, ready to submit the same day |
| Supplier data | Email chases, blank templates and PDF attachments that start from scratch every year | Branded portal, automated reminders and AI extraction from invoices and LCAs |
| Factor selection | Whichever factor someone found in a spreadsheet tab two years ago | AI-matched from 140,000+ emissions factors, with provenance recorded |
| Audit questions | Weeks reconstructing how a figure was derived - if it can be done at all | Any figure traces back to source, method and assumptions in seconds |
| Cost & commitment | Consultant day rates, re-scoped and re-quoted every single year | From £79 a month (billed annually), implementation included, upgrade whenever you are ready |
Key Benefits
Structured Supplier Engagement
Automate requesting, collecting and validating emissions data from suppliers through branded portals and configurable survey workflows. Track response rates, follow up automatically and build a progressively richer supplier dataset.
AI-Powered Factor Matching
Our AI analyses procurement descriptions, commodity codes and supplier profiles to suggest the most appropriate factors from a database of 140,000+. Reduce manual factor selection while improving accuracy and consistency.
Data Quality Scoring
Every Scope 3 data point receives a quality score based on the PCAF framework, showing whether it is supplier-specific, average-data or a spend-based proxy. Track improvement over time and prioritise engagement.
All 15 Categories Covered
Full support for all 15 GHG Protocol Scope 3 categories - from purchased goods, capital goods and fuel-and-energy activities to business travel, commuting, transport and end-of-life treatment.
Hotspot Analysis & Benchmarking
Identify your most material categories and suppliers through automated hotspot analysis. Benchmark against industry peers and sector averages to understand where you stand and where to focus reduction efforts.
Reduction Pathway Tracking
Set category- and supplier-level reduction targets aligned with science-based methodologies. Track progress in real time, model intervention scenarios and report on reductions with full traceability to underlying actions.
Start With Just Scope 3
The full Scope 3 engine on its own - or the whole ESG:ONE platform. Both include implementation, and you can move between them at any time.
Scope 3 First
The fastest route to a Scope 3 number you can defend - without buying the whole platform
billed annually (£948/year) · implementation included
- All 15 GHG Protocol Scope 3 categories, upstream and downstream
- Spend-based (EEIO), average-data, hybrid and supplier-specific calculation
- AI factor matching across 140,000+ emissions factors
- Branded supplier portal and surveys with automated reminders
- AI extraction from supplier invoices and LCA documents
- PCAF data quality score and full audit trail on every figure
- Hotspot analysis and peer benchmarking
- Scope 3 disclosure outputs for CSRD, ISSB, CDP and GRI
Full Platform
Scope 1, 2 & 3, materiality, supplier ESG, frameworks and financial impact in one system
Starter from £3,000 · Professional from £15,000 · Enterprise on request
- Scope 1 & 2 carbon accounting and core ESG data management (Starter and up)
- Full Scope 3 across all 15 categories - everything in Scope 3 First (Professional)
- CSRD / ISSB / GRI reporting across all topics (Professional)
- Double materiality assessment (Professional)
- Supplier ESG management & due diligence (Professional)
- Financial impact, portfolio ESG & custom frameworks (Enterprise)
Prove it first. 30-day pilot programme on your own data before you commit.
Never boxed in. Upgrade to the full platform at any time - your data, suppliers and audit trail carry over.
Nothing hidden. Implementation and onboarding are in the price. No setup fee.
See Your Own Spend Data Mapped in 20 Minutes
Bring a procurement or spend export to the demo. We will show you how it maps across the 15 Scope 3 categories and where your hotspots are likely to sit - before you spend a pound.
Platform Capabilities
15 Scope 3 Categories
- Category 1: Purchased goods and services with spend-based, average-data and supplier-specific methods
- Categories 2-8: Capital goods, fuel-and-energy activities, upstream transport, waste, business travel, employee commuting, upstream leased assets
- Categories 9-15: Downstream transport, processing of sold products, use of sold products, end-of-life treatment, downstream leased assets, franchises, investments
- Category-level materiality screening to focus efforts on the most significant sources
- Automated categorisation of procurement data to Scope 3 categories using AI
Supplier Data Workflows
- Branded supplier portals for self-service data submission with guided data entry
- Configurable survey templates tailored to supplier size, sector and materiality
- Automated reminders, escalation workflows and response rate tracking
- Supplier data validation rules with automated flagging of anomalies and outliers
- Multi-language support for global supply chain engagement
Estimation & Calculation Methods
- Spend-based calculations using environmentally extended input-output (EEIO) models
- Activity-based calculations using physical quantities and specific emissions factors
- Hybrid approaches that blend spend and activity data for optimal accuracy
- Supplier-specific calculations using primary data from supplier engagement
- Progressive refinement pathways to upgrade from estimates to measured data over time
Reduction Planning & Reporting
- Science-based target setting support aligned with SBTi Scope 3 guidance
- Scenario modelling for supplier switching, procurement changes and engagement strategies
- Category- and supplier-level reduction tracking with year-over-year comparison
- Automated Scope 3 disclosure generation for CSRD, ISSB, CDP and GRI
- Data quality improvement roadmaps with prioritised supplier engagement plans
Built to the standards your auditors and investors expect
Scope 3 Questions, Answered
What exactly does the £79/month Scope 3 package include?
The complete Scope 3 module: all 15 GHG Protocol categories, all four calculation methods (spend-based EEIO, average-data, hybrid and supplier-specific), AI factor matching across 140,000+ emissions factors, a branded supplier portal with surveys and automated reminders, AI extraction from invoices and LCAs, PCAF data quality scoring, hotspot analysis and benchmarking, plus CSRD, ISSB, CDP and GRI Scope 3 disclosure outputs with full audit trails. Billed annually at £948. Implementation and onboarding are included, and most clients are live in about three weeks.
Who is the Scope 3 package for?
Companies facing a concrete Scope 3 demand - a customer writing it into an RFP or supplier questionnaire, a CDP submission, a bank asking for PCAF-aligned data, or a CSRD or ISSB deadline - who do not need the full ESG platform yet. If you already handle Scope 1 and 2 elsewhere, Scope 3 First runs alongside whatever you use today.
Can I upgrade from the Scope 3 package to the full platform later?
Yes, at any time. Starter (Scope 1 and 2 essentials) is from £3,000/year, and Professional - which includes full Scope 3 alongside CSRD, ISSB and GRI reporting - is from £15,000/year. The package is built so you can start with Scope 3 and expand later: your footprint, supplier portal, factor selections and audit history carry over with no re-implementation.
Do I need supplier data before I can start?
No. Most organisations start with spend-based estimates using their procurement data, so you get a complete all-15-category footprint in your first week. You then upgrade the highest-impact categories to supplier-specific primary data over time - the platform tracks your data quality as it improves.
How does ESG:ONE collect data from my suppliers?
Through branded supplier portals with guided data entry, configurable survey templates, automated reminders and escalation, and AI extraction from invoices and LCA documents. Response rates and data quality are tracked centrally, so procurement always knows where the gaps are.
Is the output audit- and CSRD-ready?
Yes. Every figure carries a full audit trail - data source, method, factor applied and any assumptions - plus a PCAF data quality score. Disclosures generate automatically for CSRD, ISSB, CDP and GRI, aligned to the GHG Protocol Scope 3 Standard.
How long does it take to get up and running?
Most clients are live within about three weeks. Onboarding, data migration and configuration are included - there is no separate implementation fee. And if you want proof before committing, there is a 30-day pilot programme on your own data.
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Learn moreStop Estimating Scope 3. Start at £79 a Month.
Customer questionnaires, CDP, bank data requests, CSRD and ISSB all want the same thing: a Scope 3 number with a method behind it. Get one live in about three weeks - all 15 categories, PCAF-scored and audit-ready. Upgrade to the full platform whenever you are ready.
£79/month billed annually (£948/year) · implementation included