Company lists · Data refreshed September 2026

Top 25 Sustainable software development firms based in the United Kingdom

Name: Sustainable software development 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 29, 2026 496 companies tracked

RevenueBase identified 496 sustainable software development firms headquartered in the United Kingdom as of September 2026 and tracks 13,369 professional contacts across them, including 6,127 with verified work emails. London is the largest hub.

This list covers sustainable software development 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, 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

496Companies

13,369Contacts tracked

6,127Verified emails

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The 25 largest sustainable software development firms based in the United Kingdom

Ranked by team size

Top 25 of 496 sustainable software development firms 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 development 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 29, 2026	5,001-10,000	9,119 contacts →
	Partial evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 29, 2026
2	Ricardo PLC	Indirect evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
3	ISB Global	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	119 contacts →
	Partial evidence “ISB Global develops and implements software, Waste & Recycling One (WR1), that integrates, automates, and simplifies to drive greater operational efficiency and profitability for…” Source: RevenueBase Database · checked Sep 29, 2026
4	K3	Indirect evidence	Manchester \| Waalwijk \| Singapore \| \| Køge \| Ny, United KingdomHQ checked Sep 29, 2026	51-200	103 contacts →
	Indirect evidence “As a Microsoft Cloud for Retail launch partner, K3's team of expert solution architects and developers support businesses in their mission to transform retail for good.” Source: RevenueBase Database · checked Sep 29, 2026
5	Alfa Energy An Edison Energy Company	Partial evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
6	clearvue.business	Indirect evidence	Gateshead, United KingdomHQ checked Sep 29, 2026	51-200	81 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
7	Think Digitally	Partial evidence	Greenwich Peninsula, United KingdomHQ checked Sep 29, 2026	51-200	80 contacts →
	Partial evidence “At Think Digitally, we’re all about connecting people, technology, and our planet to create software that’s a joy to use.” Source: RevenueBase Database · checked Sep 29, 2026
8	Envirocentre	Indirect evidence	Glasgow, United KingdomHQ checked Sep 29, 2026	51-200	71 contacts →
	Indirect evidence “EnviroCentre is a solutions orientated consultancy that has a proven track record in providing innovative, effective and valuable advice.” Source: RevenueBase Database · checked Sep 29, 2026
9	Ecoact Part Of Schneider Electric	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	69 contacts →
	Indirect evidence “EcoAct is now SE Advisory Services.” Source: RevenueBase Database · checked Sep 29, 2026
10	The Miles Consultancy	Indirect evidence	Crewe, United KingdomHQ checked Sep 29, 2026	51-200	67 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
11	ERM Libryo	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	5,001-10,000	66 contacts →
	Indirect evidence “ERM Libryo is a trusted and pioneering part of ERM’s suite of digital solutions, designed to help organizations navigate complex regulatory landscapes and operational challenges…” Source: RevenueBase Database · checked Sep 29, 2026
12	Action Sustainability	Partial evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
13	Kinto Join Limited	Indirect evidence	Epsom, United KingdomHQ checked Sep 29, 2026	51-200	61 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
14	Gemba Advantage	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	59 contacts →
	Strong evidence “Gemba Advantage make high-impact software that is secure, scalable and sustainable.” Source: RevenueBase Database · checked Sep 29, 2026
15	3 Sided Cube	Indirect evidence	Bournemouth, United KingdomHQ checked Sep 29, 2026	51-200	59 contacts →
	Indirect evidence “We are a trusted technology partner for world changing organisations and on a mission to use technology to change millions of lives for the better.” Source: RevenueBase Database · checked Sep 29, 2026
16	Cura Terrae	Indirect evidence	Sheffield, United KingdomHQ checked Sep 29, 2026	201-500	50 contacts →
	Indirect evidence “Our mission is to provide services and solutions to help take care of the Earth.” Source: RevenueBase Database · checked Sep 29, 2026
17	WRM	Indirect evidence	Otley, United KingdomHQ checked Sep 29, 2026	11-50	47 contacts →
	Indirect evidence “Our world faces unprecedented environmental challenges - from climate change, to biodiversity loss, pollution, and unsustainable resource use.” Source: RevenueBase Database · checked Sep 29, 2026
18	Eight Versa	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	42 contacts →
	Indirect evidence “At Eight Versa, we deliver a new direction for a balanced future.” Source: RevenueBase Database · checked Sep 29, 2026
19	Exlabs	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	40 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
20	Waterman Environmental Services Limited	Indirect evidence	Lichfield, United KingdomHQ checked Sep 29, 2026	51-200	36 contacts →
	Indirect evidence “WATERMAN ENVIRONMENTAL SERVICES LIMITED is an environmental services company based out of AQUA HOUSE BRITANNIA ENTERPRISE PARK EUROPA WAY, LICHFIELD, United Kingdom.” Source: RevenueBase Database · checked Sep 29, 2026
21	Metsims Sustainability Consulting	Partial evidence	Oxford, United KingdomHQ checked Sep 29, 2026	11-50	34 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
22	Envance	Indirect evidence	Stockport, United KingdomHQ checked Sep 29, 2026	11-50	29 contacts →
	Indirect evidence “We believe that a better future for people and the planet doesn't have to be at the expense of success in the present.” Source: RevenueBase Database · checked Sep 29, 2026
23	Ethos Environmental Planning	Indirect evidence	Bath, United KingdomHQ checked Sep 29, 2026	11-50	28 contacts →
	Indirect evidence “Ethos is comprised of a specialist team of ecological, environmental and GIS consultants based in Bath, Somerset.” Source: RevenueBase Database · checked Sep 29, 2026
24	Scriptoria Sustainable Development Solutions	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	27 contacts →
	Strong 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 29, 2026
25	ISC Software Solutions LTD	Strong evidence	St. Ives, United KingdomHQ checked Sep 29, 2026	11-50	27 contacts →
	Strong evidence “We offer a comprehensive range of consulting, custom software development and support services to assist customers to improve efficiencies through automating processes, accessing…” Source: RevenueBase Database · checked Sep 29, 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 software development 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 software development firms.
Partial evidence: Its own public description names part of sustainable software development firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable software development 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 496 sustainable software development firms based in the United Kingdom

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Sustainable software development firms based in the United Kingdom at a glance

As of Sep 29, 2026

45.8%Verified-email coverage

27.0Average contacts per company

1-10Median size (employees)

35.7%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

337

11-50

112

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 496 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 development 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 the United Kingdom whose own description of what they do matches “sustainable software development 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 software development 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 software development 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 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, 6,127 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 development firms by metro

Sustainable software development firms in London177

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 development 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 software development firms are there based in the United Kingdom?

RevenueBase identified 496 sustainable software development 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 sustainable software development firms?

London leads with 177 headquartered companies, followed by Bristol (12) and Manchester (12).

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 6,127 verified decision-maker contacts tracked across these 496 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.