How to Respond to a Sustainability Questionnaire in the UK
Responding to a Sustainability Questionnaire
A sustainability questionnaire often arrives with little warning: procurement is renewing your supplier status, a customer is improving its Scope 3 reporting, or a tender team needs environmental evidence before it can proceed. The fastest response is not to start writing immediately. First separate what the customer is asking you to state from what they are asking you to prove.
First: classify the questions
The questions may range from policies and targets to detailed Scope 1, Scope 2 and Scope 3 emissions. Before writing anything, sort the questionnaire into these categories so you know what needs data versus what needs a policy answer.
- Company policy and governance — environmental policy, responsibilities and management approach
- Targets and commitments — reduction targets, net-zero commitments and timeframes
- Measured emissions — Scope 1, Scope 2 and any requested Scope 3 categories
- Methodology — boundary, reporting year, emission factors, estimates and exclusions
- Evidence — bills, calculations, reports, plans or other records supporting the answer
- Supplier / value-chain information — whether you collect emissions information from your own suppliers
GreenKPO helps UK suppliers build the carbon-data portion of that response from source records, with calculations, methodology and supporting evidence kept together. You can answer the customer's form in its required format while maintaining a reusable internal record for the next questionnaire. GreenKPO is designed to strengthen the measured-emissions and evidence portions — it should not invent policies, targets or governance claims that the business has not adopted. For the full end-to-end service — covering every stage of a questionnaire response, not just this how-to guide — see Supplier Sustainability Questionnaire support.
What carbon data should you prepare?
For a first response, start with a clearly bounded organisational footprint. Gather the reporting period, sites/entities included, electricity and fuel records, company vehicle data and any specific Scope 3 categories requested. Where complete data is not available, use a documented estimation method and label the result appropriately rather than presenting an estimate as measured data.
Contextual links: Customer requested carbon data · Scope 3 data request from a customer · Audit-ready carbon evidence
Answer in the customer's format
If the customer provides a portal, spreadsheet or scorecard, complete that format directly. A polished standalone report is useful supporting evidence, but it should not replace the requested response format. Maintain your own evidence pack behind the submitted answers so you can respond quickly if procurement asks how a figure was calculated.
Buyer-side versus supplier-side intent
This page is for the supplier receiving a questionnaire. If you're the organisation collecting data from many suppliers instead, that's a different workflow.
Collecting data from your own suppliers? See our buyer-side guide: Replace your supplier emissions questionnaire
Common questions
- Do I have to answer every sustainability question a customer sends?
That depends on your contract and the customer's procurement process. Where a question is unclear or not applicable, state that rather than guessing. Commercially, incomplete responses can delay onboarding or review. - What if we have no carbon footprint yet?
Start with the requested reporting boundary and strongest available activity data. A first baseline is more useful than unsupported claims, provided assumptions and gaps are documented. - Should we send a separate carbon report?
Use the customer's required form first. A carbon report or evidence pack can support the submission and make follow-up questions easier to answer. - Can GreenKPO complete the whole ESG questionnaire?
GreenKPO is strongest on structured carbon and emissions data, evidence and reporting. Governance, labour, diversity, ethics or other ESG sections should be answered from the company's actual policies and records.
Build the evidence behind your questionnaire response
Get your measured emissions, methodology and supporting evidence ready to drop into the customer's format — and kept as a reusable record for next time.