Carbon Footprint for Professional Services Firms (Law, Consulting, Accounting)

Why Professional Services Companies Underestimate Their Carbon Footprint

Consulting firms, law firms, accountancies, marketing agencies, architecture practices, and recruitment businesses share a common assumption: "we just work in offices, so our footprint must be tiny." This is almost always wrong.

For a professional services firm, Scope 3 — particularly business travel and employee commuting — typically represents 60–80% of total emissions. Ignoring it means reporting a fraction of your real footprint, which procurement teams at your enterprise clients recognise immediately.

This guide covers all significant sources for a professional services carbon calculation.

What Does a Professional Services Carbon Footprint Actually Look Like?

For a typical 25-person UK consultancy:

The range is wide because it is dominated by travel — a firm with one international project per client will have a very different footprint from one that works regionally.

How Do You Calculate Scope 1 for an Office?

If your company leases office space in a multi-let building and does not have a separate gas meter, your Scope 1 may be zero — the building landlord is responsible for gas heating in common areas and central plant.

If you have your own gas meter (common in ground-floor suites, sole-occupancy buildings, or buildings where heating is directly metered): Annual m³ × 2.204 kgCO2e/m³ ÷ 1,000 = tCO2e

If you do not have direct gas access and cannot get the data from your landlord, you can estimate from your floor area: a typical office in the UK uses approximately 100–150 kWh of gas per m² per year for heating and hot water.

How Do You Calculate Scope 2 for a Leased Office?

If electricity is included in your service charge and you do not have meter access, estimate from floor area: 150–200 kWh per m² per year is a reasonable benchmark for a typical office.

If you have your own electricity meter, use your annual kWh × national grid factor. Full Scope 2 calculation guide here.

How Do You Calculate Employee Commuting Emissions?

Employee commuting is the most significant emissions source for most professional services firms that have a stable office workforce.

1. Method:
2. Count headcount (use average if it changed during the year)
3. Estimate average round-trip commute distance in km (a staff survey is the best approach; 25–35 km is typical for a UK city commuter)
4. Estimate mode split (% driving, % rail, % bus, % cycling/walking)
5. Multiply by the relevant DEFRA emission factor and by 220 working days per year

Simplified worked example — 20 employees, 30 km round-trip, 60% drive (diesel), 40% rail: - Driving: 20 × 0.6 × 30 km × 0.154 kgCO2e/km × 220 days ÷ 1,000 = 12.2 tCO2e - Rail: 20 × 0.4 × 30 km × 0.035 kgCO2e/km × 220 days ÷ 1,000 = 1.8 tCO2e - Commuting total: 14.0 tCO2e

Hybrid working arrangements significantly reduce this number. If your team works 3 days in office vs. 5, your commuting emissions fall by 40% — a reduction of 5–6 tCO2e for the example above.

How Do You Calculate Business Travel Emissions?

Business travel data for professional services firms typically comes from: - Corporate booking platforms (Egencia, Concur, TravelPerk) - Expense reimbursement records - HMRC mileage logs for car journeys

See the full business travel calculator guide for all DEFRA 2023 flight, rail, car, and hotel factors.

What Is the Correct Methodology Statement for a Professional Services Firm?

When completing a supplier carbon questionnaire or EcoVadis assessment, state:

"Scope 1: natural gas for office heating (directly metered). Scope 2: purchased electricity, location-based, DEFRA 2023 grid factors. Scope 3: Categories 3 (WTT), 6 (business travel — flights, rail, and car), and 7 (employee commuting). Methodology: GHG Protocol Corporate Standard. Emission factors: DEFRA 2023. Self-assessed using DeCarbonOPS. Reporting year: [year]."

If your gas is managed by your landlord and you are estimating from floor area, note this as an assumption in the methodology.

How Do You Generate a Carbon Passport for a Professional Services Firm?

DeCarbonOPS handles all of the above in a single session. Enter your office electricity and gas, business travel by mode and distance, employee headcount and commuting estimate. The platform calculates your Scope 1, 2, and 3 totals, applies the correct DEFRA 2023 factors, and generates a verified Carbon Passport with a permanent URL — ready for your enterprise clients' procurement questionnaires.