Company lists · Data refreshed September 2026

Top 25 Home energy efficiency companies based in the United Kingdom

Name: Home energy efficiency companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 749 companies tracked

RevenueBase identified 749 company matches for home energy efficiency companies associated with the United Kingdom as of September 2026 and tracks 15,059 professional contacts across them, including 4,488 with verified work emails. London is the largest hub.

This list covers company matches for home energy efficiency companies associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 16, 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 RevenueBase SmartSearch · Exact Recorded Sep 16, 2026 How this list was built

749Companies

15,059Contacts tracked

4,488Verified emails

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The 25 largest home energy efficiency companies based in the United Kingdom

Ranked by team size

Top 25 of 749 company matches for home energy efficiency companies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 16, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	British GAS	Exact match	Windsor, United KingdomHQ recorded Sep 16, 2026	10001+	9,238 contacts →
	Exact match “Taking care of things.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
2	BOXT	Exact match	Leeds, United KingdomHQ recorded Sep 16, 2026	51-200	116 contacts →
	Exact match “We started out as a trailblazing boiler installation company in 2017 – the first to offer everything effortlessly online.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
3	TROO	Exact match	Doxford International Business Park, United KingdomHQ recorded Sep 16, 2026	51-200	106 contacts →
	Exact match “Managing business energy can be overwhelming.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
4	Hometree	Exact match	London, United KingdomHQ recorded Sep 16, 2026	201-500	102 contacts →
	Exact match “Hometree is a home energy services company on a mission to accelerate the transition to net zero.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
5	HIVE	Exact match	London, United KingdomHQ recorded Sep 16, 2026	201-500	100 contacts →
	Exact match “Welcome to greener living, lower bills, and eco-tech that feels like home.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
6	City Energy Network	Exact match	Cardiff, United KingdomHQ recorded Sep 16, 2026	51-200	98 contacts →
	Exact match “At City Energy Network, we help households across the UK improve energy efficiency, cut bills, and reduce carbon emissions.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
7	Livgreen	Exact match	Bristol, United KingdomHQ recorded Sep 16, 2026	201-500	90 contacts →
	Exact match “We are a leading provider of retrofit residential decarbonisation across the UK.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
8	Next Energy	Exact match	Knowsley, United KingdomHQ recorded Sep 16, 2026	51-200	68 contacts →
	Exact match “Established in 2016, we have grown to become one of the most reputable and reliable specialists within the renewable, heating, and insulation sectors in the United Kingdom.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
9	Cenergist	Exact match	Washington, United KingdomHQ recorded Sep 16, 2026	201-500	62 contacts →
	Exact match “Cenergist is a specialist energy and water efficiency company in the UK and Europe.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
10	Scis Group	Exact match	Fareham, United KingdomHQ recorded Sep 16, 2026	51-200	60 contacts →
	Exact match “Hello.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
11	The Improveasy Group	Exact match	Altrincham, United KingdomHQ recorded Sep 16, 2026	51-200	58 contacts →
	Exact match “Energy solutions made easy.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
12	IZ Energy Services LTD	Exact match	Barking, United KingdomHQ recorded Sep 16, 2026	51-200	57 contacts →
	Exact match “IZ Energy is pioneering a sustainable future.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
13	GEO Green Energy Options	Exact match	Hardwick, United KingdomHQ recorded Sep 16, 2026	51-200	54 contacts →
	Exact match “Since 2006, we’ve been on a mission to make home energy tech that’s easy to use and understand, reduces energy costs, increases comfort and looks great in people’s homes.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
14	ECO Providers	Exact match	Clitheroe, United KingdomHQ recorded Sep 16, 2026	51-200	51 contacts →
	Exact match “ECO Providers is a trusted leader in renewable and energy efficiency solutions, helping homeowners, businesses, and social housing organisations reduce energy costs, improve…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
15	Effective Home	Exact match	Doncaster, United KingdomHQ recorded Sep 16, 2026	51-200	48 contacts →
	Exact match “Effective Home was established in 2016 to help homeowners make their homes more energy efficient, save money and reduce their carbon footprint.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
16	Green Home Systems	Exact match	Irvine, United KingdomHQ recorded Sep 16, 2026	51-200	47 contacts →
	Exact match “At Green Home Systems, we deliver whole-house retrofit solutions that make homes warmer, more energy efficient, and lower cost to run.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
17	Cotswold Energy Group	Exact match	Stonehouse, United KingdomHQ recorded Sep 16, 2026	51-200	45 contacts →
	Exact match “Secure your greener future with renewable energy solutions!” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
18	Sureserve Energy Services North	Exact match	Brighouse, United KingdomHQ recorded Sep 16, 2026	1,001-5,000	43 contacts →
	Exact match “Sureserve Energy Services North is a leading national installer of insulation, heating solutions and renewable technologies.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
19	Avonside Energy	Exact match	Rearsby, United KingdomHQ recorded Sep 16, 2026	201-500	42 contacts →
	Exact match “Avonside Energy: Your Partner in Sustainable Building Solutions At Avonside Energy, we are dedicated to delivering best-in-class services across: New Build Insulation…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
20	ALL Seasons Energy	Exact match	Sheffield, United KingdomHQ recorded Sep 16, 2026	51-200	40 contacts →
	Exact match “All Seasons Energy is a Sheffield-based solar panel, air source heat pump, and insulation installer.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
21	Golden Globe Merchants LTD	Exact match	London, United KingdomHQ recorded Sep 16, 2026	11-50	38 contacts →
	Exact match “At Golden Globe Merchants, we deliver high-performance, energy-efficient solutions designed to future-proof UK homes.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
22	Carbon Rewind	Exact match	Watford, United KingdomHQ recorded Sep 16, 2026	51-200	36 contacts →
	Exact match “At Carbon Rewind, we are optimistic about the energy future of the UK, and committed to doing our part to deliver the vision of a more sustainable future.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
23	AMBUE	Exact match	Oxford, United KingdomHQ recorded Sep 16, 2026	11-50	29 contacts →
	Exact match “Democratising Property Decarbonisation.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
24	Infinity Energy Organisation	Exact match	London, United KingdomHQ recorded Sep 16, 2026	51-200	29 contacts →
	Exact match “At Infinity, our mission is to help home owners reduce their energy bills and carbon footprint.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
25	Eclipse Energy	Exact match	Halifax, United KingdomHQ recorded Sep 16, 2026	11-50	27 contacts →
	Exact match “Eclipse Energy are specialists in providing affordable and efficient ways to keep your home warm and dry for less.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “home energy efficiency companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 749 home energy efficiency companies based in the United Kingdom

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Home energy efficiency companies based in the United Kingdom at a glance

As of Sep 16, 2026

29.8%Verified-email coverage

20.1Average contacts per company

11-50Median size (employees)

9.5%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

361

11-50

285

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 749 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with the United Kingdom whose business descriptions match “home energy efficiency companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 4,488 professional contacts with verified work emails across the full matched dataset. 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 16, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “home energy efficiency companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many home energy efficiency companies are there based in the United Kingdom?

RevenueBase identified 749 company matches for home energy efficiency companies associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

British GAS tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most home energy efficiency companies?

London leads with 71 company records, followed by Birmingham (19) and Glasgow (16).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 4,488 professional contacts with verified work emails tracked across these 749 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 16, 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 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.