Company lists · Data refreshed September 2026

Top 25 Sustainable software companies based in the United Kingdom

RevenueBase identified 311 sustainable software companies headquartered in the United Kingdom as of September 2026 and tracks 14,873 professional contacts across them, including 6,303 with verified work emails. London is the largest hub.

This list covers sustainable software companies 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 29, 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 29, 2026 86% judged on-target in blind review
311Companies
14,873Contacts tracked
6,303Verified emails
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The 25 largest sustainable software companies based in the United Kingdom

Ranked by team size
Top 25 of 311 sustainable software companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable software companies: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceLondon, United KingdomHQ checked Sep 29, 202610001+2,823 contacts →

Indirect evidence

“Veolia UK provides solutions for ecological transformation which means reconciling human progress with environmental protection.”

Source: RevenueBase Database · checked Sep 29, 2026
2Partial evidenceWalton-on-thames, United KingdomHQ checked Sep 29, 2026201-500658 contacts →

Partial evidence

“We are passionate about driving sustainable change for our planet.”

Source: RevenueBase Database · checked Sep 29, 2026
3Partial evidenceKirkham, United KingdomHQ checked Sep 29, 2026501-1,000373 contacts →

Partial evidence

“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: RevenueBase Database · checked Sep 29, 2026
4Indirect evidenceSolihull, United KingdomHQ checked Sep 29, 2026201-500293 contacts →

Indirect evidence

“Correla exists because we dream of a simpler, greener society powered by our investment in innovation and our passion for customers.”

Source: RevenueBase Database · checked Sep 29, 2026
5Indirect evidenceLondon, United KingdomHQ checked Sep 29, 2026201-500171 contacts →

Indirect evidence

“CFP Energy is a leading provider of energy and environmental solutions for industrial and commercial clients.”

Source: RevenueBase Database · checked Sep 29, 2026
6Partial evidenceLondon, United KingdomHQ checked Sep 29, 202651-200123 contacts →

Partial evidence

“We are a new age technology driven company, providing comprehensive SaaS based ESG (Environmental, Social & Governance) solutions to address end to end sustainability needs of…”

Source: RevenueBase Database · checked Sep 29, 2026
7Partial evidenceLondon, United KingdomHQ checked Sep 29, 202651-200115 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 29, 2026
8Partial evidenceLondon, United KingdomHQ checked Sep 29, 202651-200109 contacts →

Partial evidence

“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: RevenueBase Database · checked Sep 29, 2026
9Partial evidenceLondon, United KingdomHQ checked Sep 29, 2026201-50088 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 29, 2026
10Indirect evidenceGateshead, United KingdomHQ checked Sep 29, 202651-20081 contacts →

Indirect evidence

“We enable businesses to succeed in the environmental components of their ESG strategies through comprehensive net zero consulting services and ground-breaking carbon and energy…”

Source: RevenueBase Database · checked Sep 29, 2026
11Partial evidenceMilton Keynes, United KingdomHQ checked Sep 29, 202651-20069 contacts →

Partial evidence

“TEAM is the UK’s leading supplier of carbon and energy management solutions committed to driving the efficiency and sustainability of energy consumption and environmental…”

Source: RevenueBase Database · checked Sep 29, 2026
12Indirect evidenceLondon, United KingdomHQ checked Sep 29, 2026201-50069 contacts →

Indirect evidence

“EcoAct is now SE Advisory Services.”

Source: RevenueBase Database · checked Sep 29, 2026
13Indirect evidenceCrewe, United KingdomHQ checked Sep 29, 202651-20067 contacts →

Indirect evidence

“Our mission at The Miles Consultancy (TMC) is to empower businesses with innovative, digital solutions and data-driven insights that reduce costs, lower carbon emissions and…”

Source: RevenueBase Database · checked Sep 29, 2026
14Indirect evidenceHemel Hempstead, United KingdomHQ checked Sep 29, 202651-20064 contacts →

Indirect evidence

“Our History Birdsall are an innovative company with a 48-year track record of delivering energy efficiency and environmental solutions to our clients.”

Source: RevenueBase Database · checked Sep 29, 2026
15Partial evidenceLondon, United KingdomHQ checked Sep 29, 202651-20063 contacts →

Partial evidence

“Pacific Green is becoming a world leader at providing sustainable cleantech solutions to help solve climate warming, green energy and resource scarcity challenges.”

Source: RevenueBase Database · checked Sep 29, 2026
16Partial evidenceLondon, United KingdomHQ checked Sep 29, 202651-20062 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 29, 2026
17Indirect evidenceEpsom, United KingdomHQ checked Sep 29, 202651-20061 contacts →

Indirect evidence

“We help organisations understand, measure, and meaningfully reduce their environmental impact through a unique combination of expert consultancy, advanced carbon accounting…”

Source: RevenueBase Database · checked Sep 29, 2026
18Indirect evidenceTrottiscliffe, United KingdomHQ checked Sep 29, 202651-20055 contacts →

Indirect evidence

“Renewable Energy Experts: For over 25 years, Ecolution have been at the forefront of renewable energy services, using our award-winning expertise, to help our clients innovate and…”

Source: RevenueBase Database · checked Sep 29, 2026
19Partial evidenceLondon, United KingdomHQ checked Sep 29, 202611-5042 contacts →

Partial evidence

“KarbonWise is a sustainability solutions company that helps businesses take climate action with confidence and clarity.”

Source: RevenueBase Database · checked Sep 29, 2026
20Partial evidenceLondon, United KingdomHQ checked Sep 29, 202611-5040 contacts →

Partial evidence

“Exlabs is a one-stop software partner for companies in Energy and Natural Resources who are done with slow-moving vendors and generic solutions.”

Source: RevenueBase Database · checked Sep 29, 2026
21Indirect evidenceHarrogate, United KingdomHQ checked Sep 29, 202611-5037 contacts →

Indirect evidence

“Chameleon Technology is a visionary smart technology solutions company, pioneering smart devices since 2010.”

Source: RevenueBase Database · checked Sep 29, 2026
22Partial evidenceOxford, United KingdomHQ checked Sep 29, 202611-5034 contacts →

Partial evidence

“Based in Oxford, UK and in Istanbul, Turkey, Metsims is the leading sustainability consultancy specialised in life cycle assessment (LCA), corporate and product carbon footprint…”

Source: RevenueBase Database · checked Sep 29, 2026
23Strong evidenceLondon, United KingdomHQ checked Sep 29, 202611-5025 contacts →

Strong evidence

“51toCarbonZero is the First Climate & Sustainability-Success Platform - combining proprietary software with hands-on expert advisory to help organisations measure, improve and…”

Source: RevenueBase Database · checked Sep 29, 2026
24Indirect evidenceLondon, United KingdomHQ checked Sep 29, 202611-5024 contacts →

Indirect evidence

“We are trusted experts in carbon measurement and reduction, specialising in packaging and print manufacturing, media and logistics sectors.”

Source: RevenueBase Database · checked Sep 29, 2026
25Partial evidenceCramlington, United KingdomHQ checked Sep 29, 202611-5023 contacts →

Partial evidence

“Decerna is a specialist commercial sustainability consultancy.”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 311 sustainable software companies based in the United Kingdom

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Sustainable software companies based in the United Kingdom at a glance

As of Sep 29, 2026
42.4%Verified-email coverage
47.8Average contacts per company
1-10Median size (employees)
38.6%Largest-city concentration · London
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
197
11-50
83
51-200
19
201-500
8
501-1,000
2
5,001-10,000
1
10001+
1

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 311 companies.

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 software companies, 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 the United Kingdom whose own description of what they do matches “sustainable software companies”. 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 software companies), 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 software companies, 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 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, 6,303 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 29, 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 software companies by metro

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 software companies, 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 software companies are there based in the United Kingdom?

RevenueBase identified 311 sustainable software companies 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?

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

Which city has the most sustainable software companies?

London leads with 120 headquartered companies, followed by Edinburgh (10) and Manchester (9).

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 6,303 verified decision-maker contacts tracked across these 311 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 29, 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.