Company lists · Data refreshed September 2026

Top 25 Net zero consulting firms based in the United Kingdom

Name: Net zero consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 792 companies tracked

RevenueBase identified 792 net zero consulting firms headquartered in the United Kingdom as of September 2026 and tracks 24,765 professional contacts across them, including 12,876 with verified work emails and 3,103 with mobile numbers. London is the largest hub.

This list covers net zero consulting firms headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

792Companies

24,765Contacts tracked

12,876Verified emails

3,103Mobile numbers

Unlock all 792 companies Free signup · no credit card · 500 free credits

The 25 largest net zero consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 792 net zero consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names net zero consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	ERMIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	5,001-10,000	9,119
	“Sustainability is our business.” Source: company website · checked Sep 5, 2026
2	SLR ConsultingIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	3,848
	“SLR is a committed partner in our clients’ sustainability journeys.” Source: company website · checked Sep 5, 2026
3	Anthesis GroupIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	894
	“Anthesis guides clients to sustainable performance.” Source: company website · checked Sep 5, 2026
4	KBC A Yokogawa CompanyIndirect evidence	Walton-on-thames, United KingdomHQ checked Sep 5, 2026	201-500	658
	“We are passionate about driving sustainable change for our planet.” Source: company website · checked Sep 5, 2026
5	E COIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	n/a	621
	“For over 26 years, our consultants have been supporting and guiding our clients to achieve low-carbon climate-resilient development.” Source: company website · checked Sep 5, 2026
6	The Carbon TrustIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	379
	“Our mission is to accelerate the move to a decarbonised future.” Source: company website · checked Sep 5, 2026
7	Inspired PLCStrong evidence	Kirkham, United KingdomHQ checked Sep 5, 2026	501-1,000	373
	“Inspired PLC is a leading technology-enabled provider of energy and sustainability solutions that allow UK and Irish businesses to transition to net-zero carbon and manage their…” Source: company website · checked Sep 5, 2026
8	CPWIndirect evidence	Birmingham, United KingdomHQ checked Sep 5, 2026	201-500	317
	“Climate change is without a doubt the greatest challenge we face in these times.” Source: company website · checked Sep 5, 2026
9	EIC PartnershipIndirect evidence	Redditch, United KingdomHQ checked Sep 5, 2026	51-200	316
	“EIC Partnership: A Legacy of Expertise, A Commitment to Sustainability With origins dating back to 1975, EIC has cultivated nearly 50 years of distinguished service in energy and…” Source: company website · checked Sep 5, 2026
10	Wardell Armstrong LLP NOW SLRIndirect evidence	Birmingham, United KingdomHQ checked Sep 5, 2026	501-1,000	253
	Source: company website · checked Sep 5, 2026
11	Inenco GroupIndirect evidence	Lytham, United KingdomHQ checked Sep 5, 2026	501-1,000	190
	“Inenco Group has been acquired by Sustainable Energy First.” Source: company website · checked Sep 5, 2026
12	Auditel U.K. LimitedIndirect evidence	Kingston Upon Thames, United KingdomHQ checked Sep 5, 2026	51-200	172
	“We work with FDs, CEOs, and business owners throughout the UK - delivering new perspectives and insights to increase profitability, and reduce their carbon footprint.” Source: company website · checked Sep 5, 2026
13	Vulcain Engineering - UKStrong evidence	Stonehouse, United KingdomHQ checked Sep 5, 2026	1,001-5,000	171
	“Vulcain Engineering Ltd is an ambitious engineering consultancy which is supporting the UK Government’s policy objective of 2050 Net Zero Carbon through its involvement in…” Source: company website · checked Sep 5, 2026
14	CFP EnergyIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	201-500	171
	“CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.” Source: company website · checked Sep 5, 2026
15	ZenergiStrong evidence	Chilworth, United KingdomHQ checked Sep 5, 2026	51-200	157
	“Zenergi supports and empowers your journey to net zero.” Source: company website · checked Sep 5, 2026
16	OptimisedIndirect evidence	Bristol, United KingdomHQ checked Sep 5, 2026	51-200	142
	“Optimised exists to accelerate the shift to a low-carbon future by making energy management work; commercially, operationally and sustainably.” Source: company website · checked Sep 5, 2026
17	PollinationStrong evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	139
	“Pollination is a specialist climate investment and advisory firm, dedicated to accelerating the transition to a net zero, nature positive and resilient future.” Source: company website · checked Sep 5, 2026
18	ConsultusPartial evidence	Leicester, United KingdomHQ checked Sep 5, 2026	51-200	129
	“Recognised as the Consultancy of the Year in 2021 by Energy Live News, Consultus delivers world-class consulting, buying and management services for Business Energy and Business…” Source: company website · checked Sep 5, 2026
19	AMBERIndirect evidence	Cardiff, United KingdomHQ checked Sep 5, 2026	51-200	124
	“We are an award-winning energy consultancy and certified B Corp™.” Source: company website · checked Sep 5, 2026
20	ZTPIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	115
	“At ZTP, we’re committed to accelerating the transition to a more sustainable future by reducing the negative impact of human activity on our planet - ecologically, financially…” Source: company website · checked Sep 5, 2026
21	Longevity PartnersIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	115
	“Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: company website · checked Sep 5, 2026
22	Cornwall InsightIndirect evidence	Norwich, United KingdomHQ checked Sep 5, 2026	51-200	111
	“Cornwall Insight are trusted independent experts in the energy industry.” Source: company website · checked Sep 5, 2026
23	EcolibriumIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	109
	“Ecolibrium is a sustainability tech company that empowers people to make better decisions based on proven data-driven ML algorithms through continuous monitoring, analysis and…” Source: company website · checked Sep 5, 2026
24	Katoni EngineeringPartial evidence	Aberdeen, United KingdomHQ checked Sep 5, 2026	51-200	90
	“Katoni provides consulting, engineering, optimisation and emissions reduction support for the Energy Sector.” Source: company website · checked Sep 5, 2026
25	Sustainable AdvantageIndirect evidence	London, United KingdomHQ checked Sep 5, 2026	51-200	89
	“Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: company website · checked Sep 5, 2026

Showing 25 of 792 net zero consulting firms based in the United Kingdom

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Net zero consulting firms based in the United Kingdom at a glance

As of Sep 5, 2026

1-10Median size (employees)

LondonLargest hub · 255 HQs

3,103Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

540

11-50

171

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Verified emails by last verification

0–30

12,084

31–60

737

61–90

90–180

180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among net zero consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “net zero consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among net zero consulting firms, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 12,876 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Net zero consulting firms by metro

Net zero consulting firms in London255
Net zero consulting firms in Manchester25

Frequently asked

How many net zero consulting firms are there based in the United Kingdom?

RevenueBase identified 792 net zero consulting firms headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

ERM, headquartered in London, tops this list with the largest team on record.

Which city has the most net zero consulting firms?

London leads with 255 headquartered companies, followed by Manchester (25) and Bristol (20).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 12,876 verified decision-maker contacts tracked across these 792 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

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Net zero consulting firms by geography

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.