Sustainability used to be something a business could bolt on. A page on the website, a few climate commitments, maybe a certification logo in the footer.
That’s changing.
Today it shows up as a question a customer asks before signing a contract. A field on a supplier questionnaire. A line in an RFP that wasn’t there two years ago. A data request from a lender or an investor doing due diligence.
For a lot of businesses, sustainability isn’t arriving through a regulator at all. It’s arriving through the people they already sell to, borrow from, or buy from, and most companies aren’t quite sure what’s actually being asked of them, or where to get help answering it.
What Is a Sustainable Business?
A sustainable business isn’t simply one that sells eco-friendly products or publishes a sustainability commitment on its website.
It’s a business that understands and manages the environmental, social, and operational factors that affect its customers, its compliance obligations, its costs, its supply chain, and its long-term resilience.
That’s a different bar than “be green.” A logistics company doesn’t need to reinvent its business model. It needs to know what its enterprise customers are going to ask for next year, whether it can answer, and where the gaps are.
Sustainability, looked at this way, is less a values statement and more an operational capability, closer to finance or compliance than to marketing.
Sustainability Is Becoming a Business-to-Business Requirement
For years, sustainability conversations centered on consumers. Would shoppers pay more for an eco-friendly product? Would a green label move units?
That question still matters in some categories. But it’s no longer where the pressure is coming from most often.
The bigger shift is happening between businesses.
Large enterprises now build sustainability criteria into how they select vendors. A supplier questionnaire asks about emissions, labor practices, and waste handling before a contract gets signed. An RFP includes a section on environmental policy that wasn’t there five years ago. A customer’s procurement team requests a completed ESG assessment as part of onboarding.
None of this is branding. It’s paperwork that decides whether a deal closes.
For a supplier, that means sustainability information is becoming part of the sales process itself, alongside pricing, capacity, and references. A business that can answer these requests quickly moves faster through procurement. One that can’t gets stuck, or loses the deal to a competitor who was ready.
This shows up across manufacturing, logistics, retail supply chains, and increasingly professional services. If your customers are large enterprises, government bodies, or companies connected to climate technology and infrastructure investment, expect this to keep expanding rather than fade.
You Don’t Have to Be Directly Regulated to Be Affected
Most businesses assume sustainability regulation is something that happens to someone else. A large public company. A specific industry. Not them.
That assumption is often wrong, and it’s usually not a regulator that changes their mind. It’s a customer.
Here’s the pattern: a regulation applies to a large company. That company needs data from its suppliers to meet its own reporting obligations. So it pushes a questionnaire, a data request, or a contract clause down its supply chain, including businesses that were never directly in scope of the original rule.
A few examples worth knowing, because they’re actively reshaping supply chains right now.
The EU’s Corporate Sustainability Reporting Directive (CSRD) was narrowed under the 2026 Omnibus reforms to companies with more than 1,000 employees and over €450 million in turnover. Companies that already fall within that scope have to keep disclosing annually, with 2025 fiscal year data due in 2026. Businesses below that threshold aren’t directly required to report, but plenty are still asked to supply emissions and labor data to the larger customers they sell to.
The EU’s Carbon Border Adjustment Mechanism (CBAM) puts a carbon cost on certain imported goods like steel, cement, and aluminum. CBAM became financially binding for imports made from January 1, 2026, even though the first certificate purchases don’t happen until 2027. Importers are already asking upstream suppliers for verified emissions data to manage that exposure.
In the UK, PPN 06/21 (now PPN 006) requires any supplier bidding on a UK public sector contract worth £5 million or more a year to submit a Carbon Reduction Plan covering Scope 1, 2, and some Scope 3 emissions. Frameworks below that threshold are increasingly asking for the same plan anyway, to future-proof their supplier lists.
In India, SEBI’s BRSR framework is mandatory for the top 1,000 listed companies by market capitalisation, with assurance requirements expanding to cover that full group by FY 2026-27. Unlisted and mid-sized companies aren’t required to file a BRSR report themselves, but they’re increasingly asked for BRSR-aligned data during lending, investor due diligence, and customer audits.
None of these rules were written with a mid-sized supplier in mind. But that supplier can still end up filling out the same emissions questionnaire as the company the regulation was written for.
What Sustainability Information Might a Business Need?
Once a business accepts that a request could come from a customer, lender, or investor rather than a regulator, the next question is practical: what exactly might they ask for?
Most requests fall into a handful of categories.
Emissions data. Scope 1 (direct emissions from your own operations), Scope 2 (emissions from purchased energy), and increasingly Scope 3 (emissions across your supply chain). This is the single most requested category in supplier questionnaires and RFPs.
Energy and resource use. How much energy, water, and material your operations consume, and what you’re doing to reduce it.
Sourcing and supply chain information. Where materials come from, who your suppliers are, and what visibility you have into their practices.
Labor and safety records. Working conditions, safety incidents, wages, and policies covering your own workforce and, in some cases, your suppliers’ workforces too.
Governance documentation. Policies, board oversight, and evidence that sustainability commitments are actually being tracked, not just stated.
Certifications and third-party evidence. Proof, not just claims, that specific standards are being met.
Few businesses can answer all six categories well on day one. That’s normal. The businesses that struggle are the ones that don’t know which categories they’ll actually be asked about, so they either over-invest in the wrong area or scramble when a request lands.
The Three Areas Businesses Need to Understand
Underneath all of this sit three broad areas: environmental, social, and governance (ESG). Most sustainability frameworks are built around them in some form, so it’s worth knowing what each actually covers.
Environmental factors are about resource use: energy, materials, water, waste, and emissions. This is usually where regulation and customer questionnaires focus first, because it’s the most measurable.
Social factors cover how a business treats the people connected to it. Employees, suppliers, contractors, and the communities it operates in. Labor practices and supplier ethics fall here, and weak practices can turn into contract risk fast in global supply chains.
Governance factors are about accountability. Whether commitments are backed by policy, tracked over time, and reported accurately, rather than existing as a page on the website.
These three areas rarely operate in isolation. A weak governance structure usually means the environmental and social data behind it can’t be trusted either, which is exactly what a customer’s procurement team or an auditor is checking for.
Common Sustainability Requirements Businesses Encounter
In practice, most sustainability requirements reach a business through one of these:
- Carbon and emissions disclosures, requested directly or bundled into a broader questionnaire.
- ESG questionnaires from customers, usually part of vendor onboarding or annual review.
- Supplier risk assessments, run by a customer’s procurement or compliance team.
- RFP sustainability sections, which increasingly carry real weight in scoring.
- Investor or lender due diligence requests, especially when raising capital or renewing credit facilities.
- Regulatory filings, for the businesses directly in scope of a framework like CSRD or BRSR.
- Certification or evidence requests, where a claim needs third-party backing to be accepted.
Not every business will encounter all seven. But most businesses selling into enterprise, government, or export markets will encounter at least two or three of them within a normal sales or funding cycle.
How to Assess Your Sustainability Readiness
A useful starting point isn’t a certification or a big reporting project. It’s a short internal assessment, answered honestly.
- What sustainability requirements actually apply to you. Not in general, but based on your industry, your markets, and the size of the companies you sell to or borrow from.
- Which customers or buyers are already asking. Check your last few RFPs, supplier onboarding forms, and loan applications. The requests are often sitting there already.
- What data you’d need to provide. Match the categories from earlier (emissions, sourcing, labor, governance) against what you currently track.
- Where your biggest gaps and risks sit. Some gaps are minor paperwork. Others point to a real operational risk, like a supplier you have no visibility into.
- What reporting or documentation might be required. Not every request needs a full report. Some just need a completed questionnaire or a short policy document.
- Whether you need outside expertise to close the gap. Some of this is doable internally. Some of it, particularly assurance, emissions calculation, or complex frameworks, genuinely isn’t.
Run through these six honestly and most businesses find they’re not starting from zero. They usually have some of this data already, just scattered across finance, HR, and operations rather than pulled into one place.
Why This Matters for Small and Mid-Sized Businesses
There’s a common assumption that sustainability requirements are a large-company problem. Big ESG team, big reporting budget, big compliance department.
For most small and mid-sized businesses, that’s not how it shows up.
It usually shows up as a single email. A customer’s procurement team asks for a completed sustainability questionnaire. A bank asks for emissions data as part of a loan renewal. A larger partner asks for evidence behind a claim already made on a proposal.
The problem isn’t “we need a huge ESG department.” It’s closer to: a customer asked for information, and the team isn’t sure what exactly is being asked for, whether the data exists somewhere in the business already, or who could help pull it together properly.
Smaller businesses actually have one real advantage here. Decision-making is faster, and operational changes don’t need to move through multiple layers of approval. Once the requirement is clear, closing the gap is often quicker for a 40-person company than a 4,000-person one.
When Do You Need External Sustainability Expertise?
Some of the work described above can be handled internally with time and the right templates. Some of it can’t, at least not reliably.
External expertise is usually worth bringing in for:
- Emissions calculations that need to hold up under scrutiny, particularly Scope 3, where methodology choices genuinely change the number.
- Third-party assurance, where a framework specifically requires independent verification rather than self-reported data.
- Interpreting which regulations actually apply, since scope rules change (CSRD’s Omnibus revision is a recent example) and getting it wrong either wastes effort or creates real exposure.
- Building a data collection system that doesn’t fall apart the moment the person who built it in a spreadsheet leaves the company.
This is also where a pool of vetted sustainability auditors, consultants, and verification partners becomes genuinely useful instead of a nice-to-have. Most businesses don’t need a full-time sustainability hire. They need to know which two or three outside experts can close a specific gap, and how to find them without running their own lengthy vetting process.
Sustainability Is Becoming an Ongoing Business Capability
None of this resolves with a single certification or an annual campaign.
Businesses will keep encountering sustainability requirements through customers, procurement teams, regulators, lenders, and supply chain partners, and the list of who’s asking tends to grow rather than shrink.
Understanding which requirements actually apply, what data they call for, and when outside expertise is worth bringing in isn’t a project with an end date. It’s closer to a standing business capability, the same way financial reporting or basic compliance became one.
The businesses that treat it that way tend to be the ones that aren’t scrambling when the next questionnaire lands.
