Best Carbon Footprint Consultants in the UK (2026)

A carbon footprint consultant builds a corporate greenhouse-gas (GHG) inventory under the GHG Protocol or ISO 14064-1 — Scopes 1, 2 and the 15 categories of Scope 3 — and produces an auditable report against UK SECR, UK SRS S2, CDP or SBTi requirements.

Many also support product carbon footprints under PAS 2050 or ISO 14067. The deliverable is a baseline figure expressed in tCO2e plus the underlying calculation file — the input to subsequent net-zero strategy and target-setting work.

Mid-market single-entity SECR-style corporate footprint: £6k–£25k. Multi-entity UK listed group footprint (including Scope 3 cat. 1, 3, 4, 6, 7): £30k–£90k. Full 15-category Scope 3 inventory: £40k–£150k.

Product carbon footprint (single product, cradle-to-grave): £8k–£35k. SaaS-led SME footprint (Greenly, Plan A, Normative tier): £3k–£15k per annum. Big Four pricing typically 1.5×–2.5× pure-play pricing for equivalent scope. Costs are unofficial industry indications and should be re-validated through quotes.

Carbon Trust originated UK carbon footprinting and is the only widely-recognised independent carbon label issuer. EcoAct, Anthesis, South Pole and ClimatePartner are pure-play footprint specialists.

Plan A, Greenly and Normative deliver SaaS-led footprints at mid-market and SME tiers. Achilles specialises in supply-chain carbon (Scope 3 cat. 1 + cat. 4). Inspired Plc focuses on energy-intensive UK mid-market. ERM serves the FTSE 100 large-group footprint segment. See the wider carbon consultancy market.

8–12 weeks for a single-entity SECR baseline. 14–22 weeks for a multi-entity UK listed group inventory with all 15 Scope 3 categories scoped (even if some are de minimis). 4–8 weeks for a SaaS-led SME footprint using a platform like Greenly or Plan A.

Product carbon footprints: 6–14 weeks per product, depending on supply-chain primary-data availability. Repeat-year inventories typically take 30–50% less time than the baseline year — most of the methodology work is one-off.

Both are widely accepted in the UK. The GHG Protocol Corporate Standard is the de facto market default — it underpins CDP, SBTi, UK SRS S2 and the SECR statutory regulations.

ISO 14064-1:2018 is more formal and is preferred where third-party assurance is the priority (it is the basis for ISO 14066 verification). In practice, most UK firms compute under both, since the differences are minor at the corporate inventory level.

Under UK SRS S2 — proposed by the FCA in CP26/5 for listed companies — Scope 3 disclosure is excluded in the first reporting year (2027 reporting on FY2026 data) and shifts to comply-or-explain from 2028 onward.

Companies are expected to build the Scope 3 data infrastructure ahead of that. SECR mandatory disclosure already covers Scope 1, Scope 2 and a single Scope 3 category (purchased fuel). PCAF financed emissions for financial services is a separate Scope 3 regime — see green finance.

Below £100m revenue and Scope 1/2 only, an in-house team using a SaaS platform (Greenly, Plan A, Normative) can deliver a credible baseline. For multi-entity groups, complex Scope 3 categories, or any disclosure that will be subject to third-party assurance, consultancy support is typically required.

The most common pattern is consultant-led baseline year followed by in-house plus SaaS for annual refresh — with the consultant returning for methodology review and material changes.

Carbon Trust is the originator of PAS 2050 and the established UK product carbon footprint specialist. ClimatePartner is the strongest pure-play in consumer-goods product footprints.

EcoAct and Anthesis cover product LCA for sector-specific use cases. ERM delivers product footprints inside larger transformation programmes. SaaS-led firms (Plan A, Greenly, Normative) are improving on product footprint capability, but corporate inventory remains their primary strength.

Footprint work measures the baseline (Scopes 1, 2, 3 in tCO2e) — it is a backward-looking accounting exercise under the GHG Protocol. Net-zero strategy work uses the baseline as an input but is forward-looking: target-setting, transition planning, decarbonisation pathway, CapEx allocation.

Most firms in this guide do both, but the footprint engagement is typically scoped and priced separately from the strategy engagement. See the broader UK sustainability consultancy market for the full landscape.