Company lists · Data refreshed September 2026

Top 25 Sustainable IT consulting firms based in London, United Kingdom

Name: Sustainable IT consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 13, 2026 350 companies tracked

RevenueBase identified 350 sustainable IT consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 18,931 professional contacts across them, including 10,548 with verified work emails and 2,733 with mobile numbers. London is the largest hub.

This list covers sustainable IT consulting firms headquartered in London, 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 13, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 RevenueBase Smart Search rating on every row Refreshed Sep 13, 2026 86% judged on-target in blind review

350Companies

18,931Contacts tracked

10,548Verified emails

2,733Mobile numbers

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The 25 largest sustainable IT consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 350 sustainable IT consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable IT consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	ERM	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	5,001-10,000	9,119 contacts →
	Partial evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 13, 2026
2	SLR Consulting	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	3,848 contacts →
	Partial evidence “SLR is a committed partner in our clients’ sustainability journeys.” Source: RevenueBase Database · checked Sep 13, 2026
3	Baringa	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	2,179 contacts →
	Partial evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 13, 2026
4	Ricardo PLC	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	670 contacts →
	Indirect evidence “Click the 'Follow' button and explore careers at Ricardo on our 'Jobs' and 'Life' tabs and at careers.ricardo.com.” Source: RevenueBase Database · checked Sep 13, 2026
5	Atelier TEN	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	323 contacts →
	Partial evidence “As environmental design consultants, building services engineers and lighting designers, we are committed to high performance and sustainable design within the built environment.” Source: RevenueBase Database · checked Sep 13, 2026
6	BIP UK	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	5,001-10,000	167 contacts →
	Indirect evidence “BIP is the international consultancy for the 21st century with over 6,500 consultants globally daring to make a difference.” Source: RevenueBase Database · checked Sep 13, 2026
7	ACRE	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	158 contacts →
	Partial evidence “Acre is the global market leader for sustainability executive search and recruitment services, exclusively focused on integrating sustainability and catalysing positive change…” Source: RevenueBase Database · checked Sep 13, 2026
8	ZTP	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	115 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 13, 2026
9	Greengage Environmental LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	93 contacts →
	Partial evidence “Greengage is an independent sustainability and environmental consultancy known for providing bespoke advice and working in partnership with our clients and multi-disciplinary…” Source: RevenueBase Database · checked Sep 13, 2026
10	Alfa Energy An Edison Energy Company	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	88 contacts →
	Partial evidence “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: RevenueBase Database · checked Sep 13, 2026
11	FLAG	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	84 contacts →
	Partial evidence “We're a global sustainability agency, providing strategy, communications and reporting support to the world’s leading brands.” Source: RevenueBase Database · checked Sep 13, 2026
12	Action Sustainability	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	62 contacts →
	Partial evidence “Recognised for its commitment to employees with a sought-after Best Companies “One To Watch” industry standard, Action Sustainability offers a 3-in-1 solution through…” Source: RevenueBase Database · checked Sep 13, 2026
13	Bioregional	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	50 contacts →
	Partial evidence “We’re agile sustainability experts who break daunting challenges into achievable, collaborative steps.” Source: RevenueBase Database · checked Sep 13, 2026
14	Salterbaxter	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	43 contacts →
	Partial evidence “Salterbaxter is a team of creatives and consultants at the service of sustainability.” Source: RevenueBase Database · checked Sep 13, 2026
15	Eight Versa	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	42 contacts →
	Indirect evidence “At Eight Versa, we deliver a new direction for a balanced future.” Source: RevenueBase Database · checked Sep 13, 2026
16	Kite Insights	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	36 contacts →
	Partial evidence “Kite Insights empowers businesses and people to integrate sustainability into the fabric of your organisations.” Source: RevenueBase Database · checked Sep 13, 2026
17	Envision	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	34 contacts →
	Partial evidence “Envision is a specialist sustainability, energy and net zero design consultancy offering strategic and technical advice within the built environment and to businesses wishing to…” Source: RevenueBase Database · checked Sep 13, 2026
18	LEAFR	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	n/a	34 contacts →
	Partial evidence “Leafr is reshaping the sustainability team of the future: faster, leaner, and focused on real progress.” Source: RevenueBase Database · checked Sep 13, 2026
19	Robertsbridge	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	29 contacts →
	Partial evidence “Robertsbridge advises major companies as they navigate the increasingly complex intersection of sustainability, climate, nature, and geopolitics.” Source: RevenueBase Database · checked Sep 13, 2026
20	Scriptoria Sustainable Development Solutions	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	27 contacts →
	Partial evidence “Scriptoria is an award-winning sustainable development consultancy delivering effective solutions for international development and research programmes through four core teams…” Source: RevenueBase Database · checked Sep 13, 2026
21	SB CO	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	27 contacts →
	Partial evidence “SB+CO is a sustainability consultancy that advises companies on strategy, sustainability activation and integration, ESG, stakeholder engagement and communications – and…” Source: RevenueBase Database · checked Sep 13, 2026
22	Positive Luxury	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	25 contacts →
	Partial evidence “Positive Luxury are the sustainability experts and growth partners for the luxury industry, working with global brands to turn sustainability into a competitive advantage.” Source: RevenueBase Database · checked Sep 13, 2026
23	Green Easy	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	25 contacts →
	Partial evidence “If you're looking for sustainability consultancy, look no further!” Source: RevenueBase Database · checked Sep 13, 2026
24	Canbury	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	24 contacts →
	Partial evidence “We use the latest technologies to provide our clients with a full service of sustainability support - from source data through to client reporting.” Source: RevenueBase Database · checked Sep 13, 2026
25	Sancroft	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	23 contacts →
	Partial evidence “Sancroft is an award-winning sustainability consultancy based in London.” Source: RevenueBase Database · checked Sep 13, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: sustainable IT consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names sustainable IT consulting firms.
Partial evidence: Its own public description names part of sustainable IT consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable IT consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 350 sustainable IT consulting firms based in London, United Kingdom

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Sustainable IT consulting firms based in London, United Kingdom at a glance

As of Sep 13, 2026

55.7%Verified-email coverage

14.4%Mobile-number coverage

54.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

247

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 15.0d

8,3880–30

2,04331–60

5061–90

190–180

66180+

Company record updated

Median 63.0d

00–30

9,07931–60

7,18161–90

1,59690–180

1,075180+

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 sustainable IT consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search 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 Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “sustainable IT consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names sustainable IT consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among sustainable IT consulting firms, and records with no verified work email. Companies headquartered outside London 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 its RevenueBase Smart Search 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, 10,548 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 13, 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.

Sustainable IT consulting firms by metro in the United Kingdom

Sustainable IT consulting firms in London350
Sustainable IT consulting firms in Bristol29

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names sustainable IT consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many sustainable IT consulting firms are there based in London, United Kingdom?

RevenueBase identified 350 sustainable IT consulting firms headquartered in London, 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 sustainable IT consulting firms?

London leads with 350 headquartered companies, followed by Bristol (29) and Manchester (24).

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 10,548 verified decision-maker contacts tracked across these 350 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 13, 2026.

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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 Smart Search, 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.