How to answer a supplier sustainability questionnaire
- Inemesit Ukpanah
- Mar 18
- 9 min read
A supplier sustainability questionnaire typically runs between 8 and 40 pages. It covers environmental data, social policies, governance structures, and supplier codes of conduct. Most small businesses open it once, feel overwhelmed, and forward it to someone else.
That someone else usually has no idea either.
The questionnaire is not as complex as it looks. Most of the questions map to five or six topic areas. A large share of the data you need already exists inside your business. The problem is that it has never been organised for this purpose.
This article explains what these questionnaires actually contain, which answers you can pull together quickly, and what requires preparation. It also covers the EU legal framework that now defines what large clients can and cannot ask from small suppliers.
Table of content
What supplier ESG questionnaires actually cover
Most supplier sustainability questionnaires follow one of two formats. The first is a custom form sent directly by a client or bank. The second is a platform-based assessment through services like EcoVadis, which is used by over 150,000 companies globally to rate supply chain partners.
Both formats cover roughly the same ground. EcoVadis evaluates 21 sustainability criteria across four themes: Environment, covering emissions, resource use, waste management, and energy efficiency; Labour and Human Rights, covering working conditions, health and safety, and diversity; Ethics, covering anti-corruption, data protection, and transparency; and Sustainable Procurement, covering supplier code of conduct and ESG risk management in the supply chain.
Custom questionnaires from individual clients typically mirror this structure, though with fewer questions and less scoring complexity.
How supplier sustainability questionnaires are scored
Within each theme, assessors look at three things: your policies, your actions, and your results. EcoVadis reflects this in its scoring methodology. Around 25% of points come from policies, 40% from actions, and 35% from results.
That breakdown matters practically. A signed policy with no evidence of implementation scores poorly. Documented practice with supporting records scores well, even without formal certification. Businesses that focus only on writing policies without gathering evidence typically receive a low score regardless of how well they actually operate.
This is also why blank fields hurt more than a weak answer. A blank field tells an assessor the practice does not exist. A short answer with one supporting document attached tells them it does.
The six topic areas in every ESG supplier questionnaire
Understanding the standard structure removes the sense of chaos when a questionnaire arrives.
Environmental data in supplier ESG questionnaires
This section asks for your energy use in kilowatt-hours, your Scope 1 and Scope 2 greenhouse gas emissions, your approach to waste, and your water consumption. Most small businesses can answer the energy question using their last three utility invoices. Scope 1 covers direct emissions from your own operations, such as a gas boiler or a company vehicle. Scope 2 covers emissions from purchased electricity.
Commitment and governance in supplier questionnaires
This section asks whether your company has a public sustainability commitment and who is responsible for it. For a small team, the answer is often the director or office manager. That is a valid answer. What matters is that a named person is identified and that a basic policy document exists, even a one-page statement on your website.
Social policies and working conditions
Questions here cover employment contracts, health and safety procedures, diversity practices, and training records. Most small businesses already have employment contracts, a health and safety policy, and some form of onboarding training. These exist. They are rarely stored in one place or formatted for ESG purposes.
Business ethics and data protection
This section asks about anti-bribery policies, data protection procedures, and the management of grievances. Your GDPR privacy policy counts as evidence here. A basic anti-bribery clause in your contracts is sufficient for most assessments at the SME level.
Supplier code of conduct requirements
This asks whether you require your own suppliers to meet sustainability standards. A one-paragraph supplier code of conduct is enough to answer this question. Without one, that field goes blank in every future questionnaire.
Sustainability reporting and transparency
This asks whether you publish sustainability information and how often you review it. A short annual ESG summary, even shared only on request, satisfies this requirement for most customer assessments.
What sustainability questions are small businesses actually asked
The specific wording matters. Knowing the exact question removes the guesswork when a questionnaire arrives.
On the environment, the questions are: "What is your total annual energy consumption in kilowatt-hours?" "What are your Scope 1 and Scope 2 greenhouse gas emissions?" "How do you manage and reduce waste?" "Do you track water consumption?"
On governance, the questions are: "Who in your organisation is responsible for sustainability?”, "Does your company have a written environmental or sustainability policy?" and "Has your company committed publicly to sustainability targets?"
On social policies, the questions are: "Do all employees have written employment contracts?", "Do you have a documented health and safety policy?" and "What training do employees receive?"
On supply chain conduct, the questions are: "Do you have a supplier code of conduct?" and "Do you assess the sustainability practices of your own suppliers?"
ESG evidence that your business already holds
This is where most businesses underestimate themselves. The data for a first-round supplier questionnaire usually exists. It is in the wrong format and in the wrong place.
Your energy supplier has annual kilowatt-hour figures for the last 12 months. Your waste contractor sends collection invoices. Your HR files contain employment contracts and training attendance records. Your accounts team holds insurance certificates and financial records that confirm the company structure and turnover. Your IT provider or legal team holds your GDPR privacy policy.
None of this is new data. It is existing data that has never been assembled for ESG purposes.
Greennect also provides a downloadable evidence folder template built for small teams completing this step for the first time. The output is reusable across multiple questionnaires rather than being built fresh each time.
What requires preparation before answering
Three areas consistently cause delays in businesses' responses to their first questionnaire.
Scope 1 and Scope 2 emissions estimates. Converting energy figures into carbon equivalents requires an emissions factor. The UK government publishes free conversion factors annually covering electricity and gas for most countries. Applying one factor to your annual kilowatt-hour total takes one hour. Without this step, the emissions field remains blank.
A supplier code of conduct. If one does not exist, writing a basic version takes under two hours. It needs to cover labour standards, environmental expectations, and anti-bribery principles. Without it, that section of every future questionnaire is unanswerable.
An environmental policy statement. This does not need to be a formal document. A one-page statement on your website, signed by a director, is sufficient for most first-round assessments. Without any statement, the governance section scores poorly regardless of your actual practices.
How the VSME standard limits what clients can request
Since February 2026, an important legal change has been in effect across the EU. The Omnibus Package introduced a specific protection: large companies subject to CSRD cannot demand more sustainability data from small suppliers than the VSME standard defines. This gives small suppliers a legally supported ceiling for what is reasonable to comply with.
The VSME Basic Module was developed by EFRAG and officially recommended by the European Commission on 30 July 2025. It covers approximately 50 data points across four categories: general company information, the environment, including energy, Scope 1 and 2 emissions, water, and waste; social topics; and basic governance.
If a client sends a questionnaire that goes beyond these data points, you can reference the VSME standard and request that the scope be aligned with it. That is not a confrontational position. It is a legally grounded one.
Platform-based assessments: EcoVadis and similar tools
Some large clients do not send a custom questionnaire. They ask suppliers to register on a third-party platform and complete an assessment there. EcoVadis is the most widely used. Others include CDP Supply Chain and sector-specific tools such as Drive Sustainability in automotive supply chains.
Many multinational buyers require a minimum EcoVadis score of 45 out of 100 to qualify as an approved supplier. Scores below that threshold can disqualify a company from requests for proposal. Gold or Platinum ratings, awarded to those with scores above 62 and 78, respectively, open access to preferred supplier lists and premium contracts.
The EcoVadis questionnaire is customised by company size, industry, and country. Companies classified as office-based will have fewer environmental criteria activated than manufacturing companies. For a service-based small business answering EcoVadis for the first time, the four practical priorities are: an environmental policy statement, a health and safety record, an anti-bribery policy, and evidence of how you manage your own suppliers.
Those four documents cover the highest-weighted questions for most small service companies.
What a credible answer looks like in practice
A blank field is not neutral. It signals that the practice does not exist or that the data was never tracked. Assessors read blank fields as gaps, not as an absence of obligation.
A one-sentence answer with no evidence attached is marginally better. It signals that a policy exists but cannot be verified.
A short answer with an attached supporting document is a credible answer. The document does not need to be polished. A utility invoice, a policy statement drafted in a word processor, or a training attendance list in a spreadsheet all count as evidence.
The ESG myths article on the Greennect blog documents this directly. Businesses that lose contracts due to ESG questionnaires are often not those with poor environmental practices. They are the ones with no organised evidence of existing practices.
How long does the first response take?
For a small business answering its first supplier sustainability questionnaire, a realistic timeline looks like this.
Two to three hours to gather existing documents into a single evidence folder, including utility invoices, employment contracts, and any existing policy documents. One to two hours to write any missing one-page policies, typically an environmental statement and a supplier code of conduct. One hour to convert energy data into an emissions estimate using published conversion factors. Two to three hours to complete the questionnaire itself, attaching documents as evidence for each section.
That is under ten hours of total work for most small businesses. The second questionnaire takes considerably less time because the evidence folder already exists and the policies are already written.
Building ESG answers that work across multiple questionnaires
The goal is not to answer one questionnaire. The goal is to build an evidence base that answers most questionnaires without repeating the same work.
The Greennect Starter Compliance Pack is built around this principle. It includes a two-hour assessment, an evidence folder structure, a short ESG summary, and support to complete one customer or supplier questionnaire. The output is reusable across future requests from different clients, banks, and landlords.
A 20-minute introductory call is enough to map which data points your specific questionnaire requires and which documents are missing. No preparation is needed before that call.
FAQ: Supplier sustainability questionnaire
What are the questions in a supplier sustainability questionnaire?
Most supplier sustainability questionnaires cover five areas: environmental data, including energy use and waste, social policies covering employment and health and safety, business ethics, including anti-bribery and data protection, supply chain conduct, and governance, including who holds responsibility for sustainability. Platform-based assessments such as EcoVadis use the same five-area structure across all suppliers globally. The specific question wording typically asks for annual energy consumption in kilowatt-hours, Scope 1 and Scope 2 greenhouse gas emissions, waste management approach, and whether a supplier code of conduct exists.
How do you measure supplier sustainability?
Supplier sustainability is measured using a combination of policies, documented actions, and verified results. On the EcoVadis platform, policies account for around 25% of a score, actions for 40%, and results for 35%. For office-based small businesses, environmental measurement starts with utility invoices for energy in kilowatt-hours, waste contractor receipts for collection volume, and basic water meter readings. Converting energy figures to carbon equivalents requires applying a conversion factor, available free from the UK government's annual emissions conversion tables. Results supported by source documents score significantly higher than written answers without evidence attached.
What are good questions to ask suppliers about sustainability?
The most useful questions focus on evidence rather than intent. Ask suppliers to provide their annual energy consumption in kilowatt-hours, their approach to waste separation and disposal, their health and safety incident record for the past 12 months, and whether they have a written supplier code of conduct. These four areas cover the majority of first-round ESG assessments and map directly to the VSME Basic Module categories for environment, social, and governance. For platform-based assessments, the same four areas represent the highest-weighted criteria for office-based and service-sector suppliers.
What sustainability questions should businesses prepare to answer?
Businesses should prepare to answer questions on energy consumption and greenhouse gas emissions, waste management practices, employment conditions, health and safety procedures, data protection policies, and supplier management. Under the February 2026 EU Omnibus Package, large clients subject to the CSRD may not request more from small suppliers than the VSME Basic Module specifies. That ceiling gives small businesses a clear and legally supported scope for preparation. Greennect's evidence folder template is structured around the VSME Basic Module categories to make that preparation reusable across multiple requests.
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