How to Respond to a Customer ESG Questionnaire

A customer has sent you an ESG questionnaire. It is asking for information you have never had to produce before. Carbon emissions, environmental policies, social value data, governance frameworks, supply chain management practices. The deadline is in three weeks and you are not sure where to start.

This is happening to thousands of UK businesses right now. Here is how to deal with it without panicking.

Why they are asking

Your customer is not testing you or trying to catch you out. They are collecting data because they need it for their own reporting. CSRD, UK SRS, Scope 3 requirements, and procurement frameworks all require companies to report on the sustainability performance of their supply chain. Your customer cannot report accurately without data from their suppliers. The questionnaire is how they collect it.

Understanding this removes the adversarial feeling many businesses have when they receive these questionnaires. Your customer is not judging your business. They are asking for help with their own compliance. That said, the commercial consequences of not responding are real. Silence is often interpreted as disinterest in the relationship, and standard ESG clauses now include termination rights for non-compliance.

What they are looking for

Regardless of which framework the questionnaire uses, almost all ESG questionnaires are asking for the same underlying information. What is your carbon footprint? What energy do you use, what fuel do you burn, how much waste do you produce? What are you doing to reduce your environmental impact? Do you have policies covering environment, health and safety, ethics, diversity, and data protection? Can you prove any of it with documents, data, or certifications?

Once you understand that every ESG questionnaire is a variation of those four questions, responding gets much easier. The frameworks (EcoVadis, CDP, customer-specific questionnaires) are just different packaging for the same underlying ask.

Where to find the data you need

Your carbon data is in your utility bills (electricity and gas), fuel records (fleet vehicles, machinery), waste contracts, and water bills. Twelve months of invoices will give you the numbers for a Scope 1 and 2 baseline. You do not need specialist software to start. A spreadsheet and government conversion factors (published annually by DEFRA) are enough.

Your policies may already exist in various forms. Employee handbooks contain health and safety and HR policies. Your GDPR compliance gives you data protection. Quality management systems (ISO 9001) cover governance. The task is usually pulling these together into standalone, dated documents rather than writing them from scratch.

Your certifications matter. ISO 9001, ISO 14001, ISO 45001, Cyber Essentials, Living Wage Foundation membership. List everything you have. Certifications are strong evidence because they represent third-party validation.

Common mistakes to avoid

Do not guess or fabricate numbers. If you do not have a carbon figure, say so and explain what you are doing to get one. A credible gap analysis is much better than an invented number. Procurement teams can spot estimated figures that do not hold up, and the consequences of being caught are worse than admitting you are early in the process.

Do not ignore the questionnaire. Silence is interpreted as disinterest. Even a partial response with a timeline for the missing data is better than nothing. It shows good faith and keeps the conversation open.

Do not overclaim. Saying you are "committed to net zero" without any supporting evidence, baseline, targets, or action plan will undermine your credibility rather than strengthen it. Be honest about where you are and specific about what you are doing.

Do not start from scratch for every customer. Build an evidence library: a folder of dated policies, carbon data, certifications, and social value records that you can draw from whenever a questionnaire lands. Update it quarterly.

Getting it done quickly

Our discovery session takes 90 minutes. We work through your existing data, identify what you have and what is missing, and help you put together a response your customer can trust. We also build the evidence library so you are prepared for the next questionnaire, not just this one.

Most businesses are doing more than they realise. They just need someone to organise it, fill the gaps, and present it in the format their customer expects.