What Is Scope 3 and Why Does It Matter for SMEs?

Your customer has started asking about Scope 3 emissions. You have heard of Scope 1 and Scope 2, but Scope 3 is new territory. It sounds complicated. It is broader than the other two, which makes it harder to pin down. But understanding it is becoming essential for any business in a supply chain.

The three scopes explained

The greenhouse gas protocol divides a company's emissions into three categories. Scope 1 covers direct emissions from things you own or control. Gas boilers heating your building. Fuel burned in company vehicles. Refrigerant leaks from air conditioning. Manufacturing processes. These are emissions your business directly causes.

Scope 2 covers indirect emissions from the electricity you purchase. You do not burn the fuel yourself, but the power station does it on your behalf. When you switch to a renewable energy tariff, your Scope 2 drops.

Scope 3 covers everything else in your value chain. Upstream: the products and services you buy, the raw materials in your products, your employees commuting, business travel, waste disposal, transport and distribution. Downstream: how your customers use your products, end-of-life disposal. Scope 3 has 15 categories in total and it is by far the largest for most companies.

Why it matters now

For most companies, Scope 3 represents between 70% and 98% of their total carbon footprint. A retailer can make every shop and warehouse carbon neutral, but if the products on the shelves were manufactured using fossil fuels, transported by diesel trucks, and packaged in virgin plastic, the overall footprint has barely changed.

This is why regulators are pushing hard on Scope 3. CSRD requires companies to report on their value chain. The UK Sustainability Reporting Standards are expected to require Scope 3 data, with the exact timeline still being confirmed. Companies cannot meet their net zero targets without addressing their supply chain. And they cannot address their supply chain without data from their suppliers. That is you.

What this means for your business

If you supply into a larger company, you are part of their Scope 3. When they calculate their supply chain emissions, your business is one of the numbers in their total. They need data from you. Specifically, they need to know your Scope 1 and 2 emissions (which become part of their Scope 3 purchased goods category). Some will also ask about your own Scope 3, particularly around logistics and raw materials.

Companies that cannot provide this data to their customers face real consequences. Supply chain ESG clauses now include termination rights. Procurement teams are weighting sustainability in supplier evaluations. Preferred supplier status increasingly depends on the quality of the data you can provide. The commercial risk of not engaging is growing every year.

Where to start as an SME

Start with your own Scope 1 and 2. That is the data your customers are most likely to ask for first and the easiest to calculate. Twelve months of utility bills and fuel records, applied to government conversion factors, gives you a baseline. It is a spreadsheet exercise for most small businesses.

Once your Scope 1 and 2 are calculated, look at your Scope 3 categories. For most SMEs, the biggest ones are purchased goods and services (what you buy from your own suppliers), upstream transportation (how materials get to you), and waste generated in operations. You do not need to calculate all 15 categories. Focus on the ones that are material to your business.

Ltt Group works with Vizibli, an AI-powered carbon measurement platform that connects to your existing data and calculates emissions automatically. Combined with our consultancy support, most businesses go from no data to a credible, customer-ready position within a few weeks. Our discovery session will tell you exactly where you stand and what needs to happen next. Get in touch for current pricing.