ESG vs CSR vs sustainability: what is the difference?

The difference between ESG and CSR comes down to evidence. CSR (corporate social responsibility) describes the good things a business chooses to do, like volunteering or charity partnerships, and is usually told as a story. ESG (environmental, social and governance) is a structured set of measurable criteria that investors, buyers and lenders use to judge how well a business is run. Sustainability is the bigger goal sitting behind both.

For a small business, the practical upshot is simple. When someone asks about your “sustainability” or “CSR”, they almost always want ESG-style information: figures, policies and a clear method.

What does each term actually mean?

CSR is about a company’s voluntary responsibilities to society beyond making a profit. A CSR page on a website might mention a charity of the year, a staff volunteering day and a recycling scheme. It tends to be narrative, self-selected and hard to compare between companies. The international guidance on the subject, ISO 26000, is explicitly guidance only and cannot be certified against.

ESG comes from the investment world. The term was popularised in the 2004 UN Global Compact report “Who Cares Wins”, written with major banks and asset managers who wanted a consistent way to assess non-financial risk. ESG asks specific questions under three headings and expects answers backed by data: your emissions in tCO2e, your policies, how you pay and train staff, who is accountable for what.

Sustainability is the umbrella. It means running a business in a way that can carry on without depleting resources or harming people. It is a goal rather than a reporting format, which is why it gets used loosely. “Sustainability report”, “ESG report” and “impact report” are often used to mean much the same document.

How do ESG, CSR and sustainability compare?

	CSR	ESG	Sustainability
What it is	Voluntary activity and commitments	Measurable criteria and disclosures	An overall goal
Who drives it	The business itself	Investors, buyers, lenders, regulators	Everyone
Typical format	Narrative, case studies	Data, policies, method, targets	Varies
How it is judged	Reputation	Comparability and evidence	Long-term outcomes
Example	“We support a local food bank”	“Our footprint was 6.2 tCO2e, 0.5 t per employee”	“We aim to reach net zero by 2040”

The rows blur in real life. A good ESG report includes the food bank partnership, just in the social section and with a rough figure for hours or money given.

Why has ESG overtaken CSR for small businesses?

Because the people asking now need numbers they can use.

A large customer measuring its Scope 3 emissions cannot add up a dozen CSR stories. It needs each supplier’s footprint in tonnes. A bank assessing climate risk needs to know if you run a diesel fleet. A grant assessor scoring a decarbonisation project needs your current kWh and emissions.

Public procurement makes the point clearly. Under PPN 006, suppliers bidding for in-scope central government contracts above £5 million a year must provide a Carbon Reduction Plan with defined emissions figures. A CSR statement is not accepted in its place.

New standards point the same way. The UK government’s Sustainability Reporting Standards, published in February 2026, and the EU’s voluntary VSME standard for smaller companies both focus on structured, comparable disclosures rather than narrative.

Where does greenwashing fit in?

One reason buyers have moved away from CSR-style claims is greenwashing: making environmental claims that sound good but cannot be backed up. Phrases like “eco-friendly business” or “carbon neutral” without evidence are increasingly challenged by customers and regulators alike.

ESG reporting is a sensible protection. If you state your footprint, explain your method and label which figures are estimates, you are making a claim anyone can check. That is much safer than a marketing line. Our guide to carbon neutral vs net zero covers the claims small firms most often get wrong.

Does a small business still need CSR?

The activities, yes. The label, not really.

Your volunteering, donations, local hiring and pro bono work are still valuable. Buyers and tender assessors often score them under social value. They simply work better when presented as part of an ESG report, with a rough figure attached, than as a standalone CSR page.

A practical way to think about it:

• Keep doing the community activities you believe in.
• Record them with simple numbers: hours volunteered, money donated, local suppliers used.
• Report them in the social section of your ESG report, alongside your workforce information.
• Back them up with the environmental and governance basics, which is where CSR approaches usually fall short.

What should you call your report?

Use whichever term your audience uses. If a customer sends a “sustainability questionnaire”, answer it with your ESG data. If a grant form asks for your “environmental impact”, give them your carbon footprint and environmental policy. The content stays the same whatever the label.

For most small businesses, “ESG report” is the clearest choice because it signals that you have covered people and governance as well as the environment.

What does the same business look like both ways?

Take a 14-person accountancy practice in Norwich.

Its CSR page says: “We care about our community and the environment. We support a local hospice, encourage staff to volunteer and recycle wherever possible.”

Its ESG report says: the practice used 16,000 kWh of electricity and 20,000 kWh of gas last year, giving a footprint of about 6 tCO2e including business travel. It is on a renewable tariff backed by REGOs, so its market-based electricity emissions are zero. Staff volunteered 84 hours, the firm donated £2,400 to the hospice, and every employee received at least 20 hours of training. A director is named as responsible for ESG, and there is a written environmental policy, code of conduct and health and safety policy. The target is a 25% cut in gas use by 2029.

Both describe the same firm. Only one of them can be dropped straight into a buyer’s spreadsheet.

Getting from CSR to ESG in one step

If you already have a CSR page or a list of good causes you support, you are partway there. What is usually missing is the measured part: a carbon footprint, written policies and a clear governance picture.

ESG Now fills that gap. The questionnaire asks about your energy, travel, waste, people, community work and policies in plain English, and turns the answers into a shareable ESG report with a carbon footprint calculated using the official UK government conversion factors. You also get a private action plan that shows which policies you already have in place and which are worth adding next.

Most small businesses finish in under 30 minutes, and your first report is free. Start your free ESG report, or read what ESG means for a small business for a fuller introduction. The small businesses hub explains how it fits firms like yours.