Best Carbon Consultants for UK Businesses (2026): 16 Firms Compared

We checked all sixteen firms in this guide on their own websites. Two of them publish a price. The other fourteen, including every enterprise consultancy, want you on a call first.

That is the practical problem with buying carbon consulting: the market is not hard to understand, it is just hard to compare. This guide covers sixteen UK-active firms, ten built around SMEs with 1–250 employees and six enterprise consultancies, so you can rule a whole tier in or out quickly. Each entry says who it is genuinely best for and where it falls short.

Most people land here because a customer has asked for their Scope 1, 2 and 3 footprint, or a procurement team has asked for a PPN 006 Carbon Reduction Plan for a government, NHS or Crown Commercial Service bid. If that is you, start with the table, then read the three or four entries that match. If you would rather skip straight to a fixed fee, our own fixed fee carbon consultant page covers what a UK small business gets and how the price is worked out.

All 16 firms at a glance

Sorted by tier, not by rank. Prices were checked on each firm's own website on 16 September 2026.

What that price column means, and why so much of it says "Not published", is covered after the firm entries.

SME consultancies

Six firms delivering carbon footprints and Carbon Reduction Plans as a professional service, with no platform subscription. For a one-off compliance requirement or a tender deadline, this is usually the most direct route.

1. The Carbon Stamp

Best for: SMEs who want a single fixed price, a named consultant, and a deliverable that passes procurement on the first submission.

A UK SME-only carbon consultancy delivering Scope 1, 2 and 3 footprints, PPN 006-compliant Carbon Reduction Plans, ISO 14068 carbon neutral certification and offsetting through verified projects. Reports are GHG Protocol-aligned and director-signed.

Strengths

• Published banded fixed-fee pricing, from £895+VAT. No day rates and no scope creep.
• Activity-based rather than spend-based Scope 3, with a published methodology.
• 4–8 week standard turnaround, with a 10-day expedited option.
• A Supplier Engagement Portal and Employee Carbon Survey for Scope 3 data collection.
• A live shareable carbon dashboard included with every assessment, plus 12 months of follow-up support.

Where someone else is better

• Science-based target preparation, EU taxonomy or CSRD reporting, financed emissions under PCAF and product-level life cycle assessment all sit with an enterprise consultancy.
• If you want a self-serve platform you operate year-round rather than a consultant-delivered report, EcoHedge or Seedling will suit you better.

2. Green Business

Best for: Micro and small SMEs, typically under 25 staff, who want a recognisable certification mark alongside the carbon report.

SME-only UK consultancy offering carbon footprints, PPN 006 Carbon Reduction Plans, third-party verification and the proprietary Green Business Certification, positioned as an ISO 14001 alternative for firms without in-house sustainability staff. green.business

Strengths: 300+ SMEs supported; a certification mark that is cheaper and lighter than ISO 14001; entirely human-led with no platform lock-in.

Limitations: They previously published a starting price and have since moved to quote-on-enquiry, so the price-visibility advantage they used to hold over the category has gone. Scope is deliberately narrow: no platform, no ongoing reporting environment.

3. Litmus Sustainability

Best for: Bid and proposal teams who want a consultant fluent in how government procurement scores a Carbon Reduction Plan.

UK net-zero consultancy specialising in PPN 006 CRPs for SMEs bidding on central government and NHS contracts, supported by a 12-part self-serve CRP masterclass. Also covers EcoVadis and B Corp support, ISO 14001, SECR and fractional sustainability staffing. litmussustainability.com

Strengths: Deep PPN 006 specialism and explicit bid-winning positioning; pairs done-for-you consultancy with self-serve education for cost-sensitive SMEs.

Limitations: No published pricing. The breadth across ESG ratings and staffing means carbon is one line among several rather than the whole business.

4. SBS (Sustainable Business Services)

Best for: SMEs who want ongoing fractional sustainability support over 12+ months rather than a single deliverable.

Acts as an outsourced sustainability team, delivering GHG Protocol and ISO 14064-aligned footprints, PPN 006 CRPs and verification, framed around supply-chain and tender-readiness pressure. sbs.eco

Strengths: Embeds with the client team; bundles Carbon Literacy training, Scope 3 and sustainable procurement into one programme; free Net-Zero Scorecard as an entry point. With several obligations running at once, the bundle beats commissioning separate projects.

Limitations: Programme-based pricing, not published, and the model is built for a retained relationship. If you want one report and nothing else, it is more commitment than you need.

5. ecollective

Best for: SMEs in travel, events, hospitality and food, where sector-specific Scope 3 dominates the footprint.

Sector-specialist SME consultancy producing footprints and reduction plans with a "no waffle" reporting style, plus Carbon Literacy training. ecollectivecarbon.com

Strengths: Genuine depth in industries where a generalist will misclassify emissions or apply the wrong factors. Explicit about delivering reductions without leaning on offsets.

Limitations: The sector focus cuts both ways. Outside travel, events and food you are buying a generalist. No published pricing.

6. C Free

Best for: SMEs whose entire reason for a CRP is a current or upcoming NHS Supply Chain or Crown Commercial Service bid.

UK environmental consultancy specialising in carbon footprint calculations and Carbon Reduction Plans for suppliers bidding into public-sector and NHS frameworks, with an explicit focus on tender success and procurement readiness. c-free.co.uk

Strengths: Strong NHS supplier specialism; bespoke data dashboards as part of delivery; testimonials concentrated in NHS Supply Chain and consumer goods.

Limitations: Narrow positioning, so less relevant if your driver is a customer ESG request rather than a public tender. No published pricing.

Platforms with consultancy support

Four firms combining software with expert support. They suit businesses reporting year after year, or whose finance team already runs Xero, Sage or QuickBooks. For a single PPN 006 requirement a subscription usually costs more than a one-off fee.

7. NetZero Group (NetScope)

Best for: Mid-market SMEs, roughly 100+ staff, needing both a one-off CRP and an ongoing reporting environment.

UK consultancy combining the NetScope platform with senior consultants to deliver PPN 006 CRPs, SECR, TCFD, Greener NHS reporting and net zero roadmaps. netzero.co.uk

Strengths: Hundreds of PPN 006 CRPs delivered; explicit manufacturing and NHS sector focus. Their stated model is a fixed fee for year one then an annual subscription, a fair structure if you know you are reporting again.

Limitations: No published pricing, and the annual subscription only earns its keep if you keep reporting.

8. EcoHedge

Best for: Small businesses already running finances on a cloud accounting platform, and anyone who wants to compare costs without booking a call.

UK-built carbon accounting SaaS pulling data from Xero, QuickBooks and Sage, generating GHG Protocol Scope 1/2/3 reports, with PPN 006 CRPs as a paid consultancy add-on. ecohedge.com

Strengths: The only firm here other than us that publishes prices, and it publishes them in detail: tiers from £24/month with a per-report fee, £99/month for unlimited, plus separately priced expert services up to an independent assurance option. Sub-10-minute onboarding and native accounting integrations remove most of the manual data collection.

Limitations: The PPN 006 CRP is a paid add-on rather than part of the platform, so the headline subscription price is not the whole cost for a tender. Self-serve by design, so you are operating it.

9. Seedling

Best for: Larger SMEs and lower mid-market businesses, roughly 100–2,000 FTE, wanting a persistent platform with a named advisor.

All-in-one carbon accounting and net zero planning platform with SECR, B Corp, EcoVadis and PPN 006 templates and a named carbon expert per client. seedling.earth

Strengths: Activity-based methodology and ISO 14064 alignment; a named expert per client, which is unusual for the SaaS category and closes much of the gap with a consultancy; CRP turnaround claimed under four weeks; a free Starter tier to try before committing; channel partnerships with UK accountancy firms.

Limitations: Paid Core and Advanced tiers are quote-on-demo, so the free tier is the only price you can see. Built for an ongoing annual cycle, so if you need one signed deliverable to clear a tender you are paying for platform capability you will not use.

10. Flotilla

Best for: SMEs working toward B Corp certification, or construction SMEs wanting a structured action library alongside the compliance documents.

UK B Corp carbon and ESG platform integrating with finance and HR systems for full Scope 1/2/3 footprints, PPN 006 CRPs and SECR, backed by an advisory team. flotillagroup.com

Strengths: B Corp certified, with UK offices in London, Harrogate and Manchester; strong construction traction; Sage, Xero and QuickBooks integrations; a tiered range from ESG Essentials up to ESG Manager and Portfolio Manager, plus decarbonisation action libraries for firms that have the data but not the next step.

Limitations: No published pricing at any tier. The ESG breadth is overhead if all you need is a carbon number.

Enterprise consultancies, and when to use one instead

These six are not competitors to an SME specialist. For a 30-person business bidding on one tender they are slower and several times more expensive for the same usable deliverable. But there is work an SME consultancy genuinely cannot do.

Go to an enterprise firm if you need:

• Support preparing a science-based target for submission. Worth being precise, because the language is routinely abused: no consultancy validates a science-based target. Validation is carried out by SBTi Services Limited, a wholly owned but legally separate subsidiary of the Science Based Targets initiative that operates independently from the standard-setter. What firms sell is the work up to submission: the inventory, the pathway, the base-year recalculation policy and the submission itself. Enterprise firms run that end to end. We produce inventories aligned to science-based targets that can serve as your base year, but we do not run the submission process.
• EU taxonomy or CSRD reporting, which we do not offer.
• Financed emissions under PCAF, if you are a lender or investor.
• Product-level life cycle assessment or whole-life carbon, a different engagement from a corporate footprint using different standards.
• Multi-country group consolidation across subsidiaries in several jurisdictions.

None of the six publishes a price. Expect a scoping process and a proposal rather than a rate card.

• 11. Carbon Trust. London-founded, 300+ experts. Net zero transition planning, footprinting including financed emissions, product carbon labelling and certification. Best for large organisations and financial institutions wanting a recognised label. carbontrust.com
• 12. Anthesis Group. Global sustainability advisory covering net zero and decarbonisation, carbon credits, environmental management and reporting, across Europe, the Americas, Australia and South Africa. Best for mid-market and large companies wanting combined ESG and carbon work with international operations. anthesisgroup.com
• 13. ERM. The largest pure-play sustainability advisory. Chemicals, financial services, manufacturing, mining, oil and gas, power, renewables, technology and pharmaceuticals. Best for large industrial and listed groups with complex assets and assurance requirements. erm.com
• 14. South Pole. Offices in over 20 countries. Reporting and disclosure, net zero strategy and target setting, renewable energy procurement, Scope 3 decarbonisation, carbon credits and CORSIA. Best for international groups needing target setting alongside energy procurement or credit sourcing. southpole.com
• 15. SLR Consulting. UK-headquartered, roughly 5,000 staff across 140+ offices. Climate resilience and net zero, energy transition and sustainable finance inside a broad environmental engineering practice. Best when carbon sits within a wider environmental or planning programme. slrconsulting.com
• 16. ClimatePartner. Munich-headquartered, 6,000+ companies. Corporate and product carbon footprints, target setting, certified climate projects and compliance labelling alongside its own platform. Best for consumer brands needing product footprints and on-pack claims across European markets. climatepartner.com

Why almost nobody publishes a price

Two of sixteen. That is worth sitting with, because it is the single biggest practical obstacle to comparing carbon consultants: for fourteen of these firms you cannot find out what anything costs without booking a call.

The two exceptions work differently. The Carbon Stamp publishes one-off fixed fees banded by employee count, from £895+VAT for a Carbon Impact Report and £1,095+VAT with a PPN 006 CRP. EcoHedge publishes subscription tiers from £24/month plus a per-report fee, with £99/month for unlimited reports and separately priced expert services. Green Business used to publish a starting figure and has withdrawn it.

What a published price does and does not tell you

It does not tell you the work is good. Plenty of firms in the "Not published" column do excellent work, and a low advertised figure can hide a scope so narrow that the report fails the thing you bought it for.

What it does tell you is that the firm has a defined scope it will stand behind before you are in a sales conversation, and that the fee is unlikely to move once work starts. That matters for the two failure modes SMEs actually hit: an open-ended day rate with no cap, and a quote that climbs once the consultant sees your Scope 3. If a firm will not indicate a range on a first call, ask what would have to be true for the fee to change after you sign.

One pattern is worth naming. The enterprise tier publishes nothing at all. All six quote by scoped project, which is normal for enterprise professional services and is not a criticism, but it means price discovery costs you several calls. That rarely suits a business with a tender deadline four weeks out.

For what drives the number up or down at the SME end, our carbon footprint assessment cost guide breaks the fee down line by line.

How to choose between them

Start from what triggered the request, not from the deliverable. Carbon consulting is sold through four delivery models, and the right one is decided by your situation rather than your headcount.

Path A: a footprint for a customer

Customer disclosure, B Corp, EcoVadis or voluntary reporting, no tender involved. You need a GHG Protocol-aligned footprint covering Scope 1, 2 and material Scope 3, director-signed. No Carbon Reduction Plan required.

• Single fixed price and a named consultant → The Carbon Stamp or Green Business
• Food, drink or visitor attractions → The Carbon Stamp (food and drink and visitor attractions are both published specialisms, with named clients in each). For travel and events specifically, ecollective.
• Construction, manufacturing, fashion or wholesale → The Carbon Stamp (construction, manufacturing, fashion and wholesale, each with its own regulatory pressures and case studies)
• Already on Xero, Sage or QuickBooks → EcoHedge, Seedling or Flotilla. We do not integrate with accounting software; we collect Scope 3 data through a supplier portal and employee survey instead.

Path B: a public-sector tender

You need the footprint and a PPN 006-compliant Carbon Reduction Plan on top of it, formatted for procurement evaluation. The CRP cannot exist without the footprint.

• Fixed-fee one-off, no software → The Carbon Stamp, Litmus or C Free
• NHS Supply Chain or Crown Commercial Service → The Carbon Stamp, C Free, Litmus or NetZero Group
• Manufacturing or NHS mid-market → The Carbon Stamp (we publish manufacturing and healthcare supplier work, and every assessment ships with a live dashboard on a permanent link). If you want a platform your own team logs into and operates, NetZero Group or Flotilla.
• Ongoing support beyond the tender → The Carbon Stamp (12 months of follow-up support and procurement Q&A included, then a re-baseline the following year at the same fixed fee with no renewal mark-up), SBS or ecollective for a broader retained programme.
• B Corp path alongside the CRP → The Carbon Stamp (the report is built to drop into a B Corp or EcoVadis submission), or Flotilla, which is itself a certified B Corp.

SECR is separate again, an annual disclosure that only applies once you cross the large-company threshold (250 staff, £36m turnover or £18m balance sheet, meeting two of three). Not sure yet? Our free carbon footprint calculator gives you an estimate and your top three hotspots before you pay anyone. For the questions to put to any firm before signing, see the seven criteria and five red flags on our consultancy page.

What "tender-ready" looks like in practice

Comparison guides are full of claims about turnaround. Here is what ours produced, clients named and numbers as reported:

• Germicidal UV: PPN 006 Carbon Reduction Plan in under 7 days, plus NHS Evergreen support. Footprint 4.05 tCO₂e, entirely Scope 3.
• J Hopkins Contractors: PPN 006 CRP in under 14 days for a National Highways tender, with the deadline already running.
• Advanced Coated Products: 191.38 tCO₂e measured and offset, 34.97% reduction in year one, ISO 14068 for two consecutive years.
• Steritrap: early-stage healthcare manufacturer with no trading history, given a first-year forecast footprint and NHS Evergreen submission support. Review verifiable on Trustpilot.

More across seven sectors on our client reviews page.

How we chose these firms

The ten SME firms each meet six criteria: UK-registered and actively delivering carbon work to SMEs in 2026; an SME-focused engagement model; demonstrable PPN 006 delivery through named clients, case studies or published CRPs; methodology aligned with the GHG Protocol Corporate Standard and DEFRA conversion factors; an SME-accessible commercial model rather than enterprise day-rate quoting only; and identifiable third-party signals such as ISO 14064, B Corp, IEMA or the Carbon Literacy Project.

The six enterprise firms are included on a different basis. They are the firms an SME is most likely to meet when searching, listed so you can rule them in or out quickly rather than ranked against SME specialists.

Pricing was checked by hand on each firm's own website on 16 September 2026. No figure appears here unless it was publicly readable on that date. Pricing pages change, so check before relying on any of it. This guide is published by The Carbon Stamp, which is one of the firms compared.

How much should a UK business budget?

Most UK SMEs spend between £600 and £6,000+VAT for a one-off engagement covering Scope 1, 2 and material Scope 3 plus a PPN 006-compliant Carbon Reduction Plan. The range is wide because cost scales with headcount, sites and Scope 3 depth. At the enterprise end there is no published range at all.

Our own pricing page lists every band in full, from 1 employee to 250, so you can read the exact figure for your headcount without speaking to anyone. The two packages are:

• Carbon Impact Report, from £895+VAT. Full Scope 1, 2 and material Scope 3 footprint, GHG Protocol-aligned, DEFRA factors, director-signed and ready for customer disclosure, B Corp, EcoVadis or ESG reporting.
• Procurement-Ready Package, from £1,095+VAT. Everything above plus a PPN 006-compliant Carbon Reduction Plan formatted for central government, NHS Supply Chain and Crown Commercial Service evaluation.

Related guides

• How to choose a carbon consultant in the UK
• What a carbon footprint assessment costs in the UK
• Do you need a PPN 006 Carbon Reduction Plan consultant?
• Best carbon accounting software for UK SMEs (2026)
• PPN 006 explained: what it is and who it affects

Frequently asked questions