If your customers have started asking for the carbon footprint of the products they buy from you, you are not alone — and it is not a passing trend. Under the EU’s Corporate Sustainability Reporting Directive (CSRD), large companies must now report their Scope 3 emissions: the emissions embedded in their supply chain. For most manufacturers’ customers, Scope 3 is the largest part of their footprint, and the only way to report it accurately is to get real carbon data from suppliers — from you. This article explains what they actually need, why a verified figure matters, and how to give it to them.

Why your customers are suddenly asking

Scope 3 covers value-chain emissions — everything a company does not burn or buy as energy directly, including purchased goods and materials. For a manufacturer buying your product, your product’s footprint is part of their Scope 3. Because CSRD (and frameworks like the GHG Protocol and the SBTi) require companies to measure and reduce Scope 3, they have to turn to their suppliers for numbers. A purchasing or sustainability team asking you for „the carbon footprint per unit” is doing exactly that.

Primary data beats spend-based estimates — and they know it

When a company cannot get real data from a supplier, it falls back on spend-based or industry-average factors: rough estimates derived from how much money was spent. These are weak, and reporting frameworks increasingly ask companies to disclose what share of their Scope 3 is based on primary (supplier-specific) data rather than averages. That creates a clear incentive: suppliers who can hand over a credible, product-specific figure become the easy, preferred choice. Suppliers who cannot are replaced in the model by a generic average — and, increasingly, in the tender.

What „good” supplier data actually looks like

Not every number is usable. To be accepted into a customer’s carbon accounting, your figure should be:

  • Product-specific — a carbon footprint for your product, per a clear declared unit (per tonne, per piece, per m²), quantified to ISO 14067;
  • Independently verified — to ISO 14064-3, by someone other than the person who calculated it, so the customer can trust it without re-checking;
  • Transparent on boundary — clear about which life-cycle stages are included (A1–A3, plus transport A4 where relevant);
  • Traceable — published in a register with a verifiable entry (a QR code the customer can check), not a number in an email.

That is precisely what a verified product carbon footprint is. It turns „trust me, it’s about this much” into a document your customer’s auditor will accept.

It plugs straight into the tools they already use

Most large buyers run their carbon accounting through a platform, and every serious platform prefers supplier-specific data over averages — that is the entire point of supplier engagement. A verified product carbon footprint gives them a clean, defensible value to enter against your line in their inventory. Instead of being one of hundreds of „estimated” rows, your product becomes a primary-data row — which improves their data quality score and makes you the supplier they want to keep.

The commercial upside for you

Supplying verified carbon data is not a cost centre — it is a sales tool:

  • Preferred-supplier status with customers who are graded on primary-data coverage;
  • Tenders — a growing share of public and private tenders ask for product carbon data, and some score it;
  • Differentiation — a verified figure, lower than a competitor’s generic average, is a concrete selling point;
  • Future-proofing — the same verified data feeds the EU Digital Product Passport and other product-level disclosure that is coming regardless.

How to produce it

Under the EPD Polska programme there are two routes. If you already have a calculation, we verify it independently and issue the certificate. If you do not, we prepare the full footprint study and verify it — by separate teams, to preserve impartiality. Either way the result is a figure per declared unit, to ISO 14067, verified to ISO 14064-3, and published in our public register with a QR-verifiable entry. The data we need from you is straightforward: your materials, energy, fuels and transport per unit of output.

One clarification worth keeping straight: this is a product carbon footprint, the supplier data your customers feed into their Scope 3. It is not your own company-wide inventory, and it is not CBAM — those are separate exercises. For the difference between a footprint and a full EPD, see EPD or product carbon footprint: which one do you need?

In short

Your customers’ Scope 3 problem is your opportunity. The manufacturers who can hand over a verified, product-specific carbon figure will be the ones kept in the supply chain and the tender. If a customer has asked you for carbon data — or you expect them to — tell us what you make and we will confirm the scope and a quote. Scoping is free.