Carbon Reporting for Trades and Contractors: Plumbers, Electricians, HVAC
Why Trades Businesses Are Getting Carbon Questionnaires
Carbon reporting for trades and contractors — plumbers, electricians, HVAC engineers, gas engineers, and building services contractors — is arriving faster than most trades business owners expect. The reason is straightforward: the large main contractors who hire subcontractors (Balfour Beatty, Morgan Sindall, Wates, Kier, Laing O'Rourke) are subject to CSRD and must include their Scope 3 supply chain emissions in their sustainability reports.
That means your main contractor client needs your carbon data — even if you are a sole trader with two vans.
What Is a Trades Business's Carbon Footprint?
Good news: trades businesses have relatively simple carbon footprints. Your emissions typically come from just three or four sources:
Scope 1 — Van and vehicle fuel (usually the largest item): Every litre of diesel or petrol burned in your vans generates 2.683 or 2.267 kgCO2e. A typical trades van covering 25,000 miles per year on diesel generates approximately 10–12 tCO2e from fuel alone.
Scope 1 — Refrigerant leaks (HVAC and refrigeration engineers only): If you work on air conditioning or refrigeration systems, any refrigerant top-up in your own equipment generates Scope 1 emissions. This does not include refrigerant you top up in customer equipment — that is the customer's Scope 1.
Scope 2 — Workshop or depot electricity: If you have a workshop, depot, or yard with electricity supply, that is Scope 2. Many sole traders and small trades businesses have zero Scope 2 (working from home or a rented yard).
Scope 3 — Business travel and commuting: Travel to sites beyond normal business driving (flights to distant projects), and employee commuting to your depot.
Worked Example: UK Plumbing Business
Sample company: A 4-person plumbing business in the East Midlands
Scope 1 — Van diesel (3 vans × 22,000 miles × 3.2 L/100km × 2.683 kgCO2e/L): 3 × 22,000 miles = 66,000 miles = 106,216 km Fuel: 106,216 × 0.032 = 3,399 litres × 2.683 = 9,120 kgCO2e = 9.1 tCO2e
Scope 2 — Depot electricity: 8,000 kWh × 0.207 = 1,656 kgCO2e = 1.7 tCO2e
Scope 3 — Commuting (4 staff, average 8 miles each): 2.8 tCO2e
Scope 3 — Waste (off-cuts, packaging): 0.2 tCO2e
Total: 13.8 tCO2e | Per employee: 3.5 tCO2e/FTE
What Main Contractors Ask Their Subcontractors
When a main contractor sends a sustainability questionnaire to a subcontractor, they typically ask for:
- Total Scope 1 emissions (tCO2e) — predominantly van fuel
- Total Scope 2 emissions (tCO2e) — depot electricity
- Total Scope 3 emissions (tCO2e) — commuting and waste
- Emission intensity per employee
- Whether you have a carbon reduction plan
Many contractors now include sustainability scores in their procurement decisions — a subcontractor with a verified carbon passport and a simple reduction plan (e.g., switching to electric vans) scores better than one with no data.
The Fastest Way for a Trades Business to Respond
Gather 12 months of fuel card statements or fuel receipts, plus your electricity bill if you have a depot. Enter the totals into DeCarbonOPS — it takes under 15 minutes for a trades business. You get a Carbon Passport with a verification URL to paste into any subcontractor questionnaire portal. Free for your first annual report.
Frequently Asked Questions
Do tradespeople need to report carbon emissions?
Most sole traders and small trades businesses are not legally required to report carbon emissions. However, main contractor clients who are subject to CSRD or SECR must include their Scope 3 supply chain emissions — which means they ask subcontractors for carbon data. Trades businesses receiving questionnaires from main contractors like Balfour Beatty, Kier, or Wates need to respond with basic Scope 1, 2, and 3 figures.
What is the biggest emission source for a trades business?
For most trades businesses — plumbers, electricians, HVAC engineers, gas engineers — the largest emission source is van and vehicle diesel (Scope 1). A diesel van covering 25,000 miles per year generates approximately 10–12 tCO2e. For a 4-person trades business with 3 vans, vehicle fuel typically represents 60–70% of total emissions.
How long does it take a trades business to calculate its carbon footprint?
Under 15 minutes using DeCarbonOPS. You need 12 months of fuel card statements (or estimated annual fuel spend), plus your depot electricity bill if applicable. The platform calculates your Scope 1, 2, and 3 totals and produces a Carbon Passport with a verification URL to paste into subcontractor questionnaire portals. Free for your first annual report.
What is the fastest way to reduce carbon emissions as a trades business?
The highest-impact action for a trades business is switching diesel vans to electric — eliminating the largest single emission source. A diesel van generating 10 tCO2e per year replaced by an electric van charged on the UK grid generates approximately 1.7 tCO2e — an 83% reduction per vehicle. Government grants (Plug-in Van Grant) are available for commercial electric vehicles.
Do I include customer site emissions in my carbon footprint?
No. Your corporate carbon footprint covers your own operational emissions — your van fuel, your depot electricity, your business travel, and your staff commuting. The emissions at customer sites (the gas boiler you service, the electrical system you install) belong to the customer's carbon footprint, not yours. Your footprint is the operational impact of running your business.
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