The Supplier ESG Checklist Your Biggest Customers Are Already Using

If one of your larger customers has not asked you about ESG yet, they probably will. Major retailers, manufacturers and public-sector buyers are building formal supplier ESG programmes — scoring suppliers on ethics, carbon, safety and traceability before placing orders or renewing contracts.

Here is what a structured supplier ESG programme typically asks for, and what you need to have ready.

Ethical trading declarations

The starting point is usually a self-declaration. Your customer wants to know that your business follows fair labour practices, has a modern slavery statement, pays its suppliers on time and sources from responsible origins.

These declarations are often annual and sometimes require a countersignature from a director. Some buyers will not place an order until one is on file.

Having a signed declaration is straightforward. The harder part is knowing what is happening in your own supply chain — which is where tier-two and tier-three visibility matters.

Third-party assessments: EcoVadis and Sedex

Many large companies now want an independent assessment rather than a self-declaration alone. EcoVadis and Sedex are two of the most widely used. EcoVadis scores you across four themes: environment, labour and human rights, ethics and sustainable procurement. Sedex, often paired with a SMETA audit, looks at labour standards, health and safety, environment and business ethics.

If you have not completed one before, expect to spend time gathering evidence — policies, payroll records, energy bills, training logs and certificates. Some buyers specify a minimum score. Budget several weeks for your first submission, and treat every subsequent year as a maintenance exercise rather than starting from scratch.

The key is to keep your certificates, scores and evidence accessible so you can share them quickly when a customer asks.

Carbon data

This is the area growing fastest. Large companies increasingly report their Scope 3 emissions — the greenhouse gases in their supply chain — for example under CSRD in the EU. In the UK, suppliers bidding for central government contracts worth more than £5 million a year need a Carbon Reduction Plan under PPN 006. To report Scope 3, your customers need data from you.

You will typically be asked for your total Scope 1 and 2 emissions. Some buyers want your Scope 3 as well. You may also be asked whether you have a carbon reduction target and whether it follows science-based methods.

The simplest starting point is to measure your footprint, set a target and produce a Carbon Reduction Plan you can share. GreenThread helps you do this: upload your energy bills, fuel receipts and spend data, let AI draft the figures for your review, collect data from your own suppliers, and produce a report in the format your customer asks for — SECR, PPN 006, CDP or another of the 30-plus frameworks it covers. GreenThread helps you comply; it is not a substitute for professional legal, tax or assurance advice.

Site and facility audits

Formal supplier programmes often include an on-site element. A third-party auditor visits your premises to check that your working conditions, environmental controls and governance processes match what you declared on paper.

The best preparation is documentation that is easy to find: up-to-date policies, training records, risk assessments, inspection logs and corrective action records. Being able to produce them immediately, rather than spending the day searching, leaves a much better impression.

Sustainable product and packaging

Buyers with thousands of product lines are under pressure to reduce the footprint of what they sell, not just how they operate. They are asking suppliers to think about materials, weight, recyclability and end-of-life handling.

This is a longer conversation than a checklist, but going in with data helps: your current materials, packaging weight, any changes already made, and what you plan to do next. Even small, documented improvements show you are moving in the right direction.

Being the supplier that passes

Most large companies work through their supplier base by spend and risk — the biggest and highest-risk suppliers get assessed first. If you supply into a major retail or distribution chain, it is a question of when, not whether, you will be scored.

Having your ESG data in one place makes every audit faster and every questionnaire easier to complete. SupplyThread keeps ESG profiles, assessments and questionnaires, sanctions screening, risk scores and evidence records — including your EcoVadis or Sedex certificates and scores — together on one supplier record. GreenThread handles your carbon measurement and the reports your customers ask for.

Both are available on a 14-day free trial from your DMG account. If you manage a large supply chain of your own, SupplyThread Business covers up to 1,000 suppliers with N-tier mapping and ESG and Scope 3 tracking. For bigger programmes, Enterprise is quoted — get in touch.