Company lists · Data refreshed September 2026

Top 25 Residential energy efficiency companies based in the United Kingdom

Name: Residential 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 17, 2026 1,395 companies tracked

RevenueBase identified 1,395 company matches for residential energy efficiency companies associated with the United Kingdom as of September 2026 and tracks 23,854 professional contacts across them, including 7,766 with verified work emails. London is the largest hub.

This list covers company matches for residential 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 17, 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 17, 2026 How this list was built

1,395Companies

23,854Contacts tracked

7,766Verified emails

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

Ranked by team size

Top 25 of 1,395 company matches for residential energy efficiency companies based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 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 17, 2026	10001+	9,238 contacts →
	Exact match “Taking care of things.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	Centrica	Exact match	Windsor, United KingdomHQ recorded Sep 17, 2026	10001+	4,555 contacts →
	Exact match “Centrica is an international energy services and solutions company, founded on a 200-year heritage of serving customers in homes and businesses.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	Changeworks	Exact match	Edinburgh, United KingdomHQ recorded Sep 17, 2026	51-200	170 contacts →
	Exact match “Changeworks is a leading organisation dedicated to decarbonising Scotland’s homes and a just transition to net zero.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
4	Bring Energy	Exact match	London, United KingdomHQ recorded Sep 17, 2026	51-200	125 contacts →
	Exact match “We are Bring Energy.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
5	BOXT	Exact match	Leeds, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
6	AES	Exact match	Enfield, United KingdomHQ recorded Sep 17, 2026	201-500	112 contacts →
	Exact match “As renewable energy technology experts, we have the knowledge and skills to help commercial clients switch to a greener, lower cost and more independent energy source.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Glow Green	Exact match	Bournemouth, United KingdomHQ recorded Sep 17, 2026	51-200	110 contacts →
	Exact match “Glow Green is one of the UK's leading installers of Solar Panels, Battery Storage, Heat Pumps, Boilers, AC Units, & EV Chargers.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	TROO	Exact match	Doxford International Business Park, United KingdomHQ recorded Sep 17, 2026	51-200	106 contacts →
	Exact match “Managing business energy can be overwhelming.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Hometree	Exact match	London, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
10	HIVE	Exact match	London, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
11	City Energy Network	Exact match	Cardiff, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
12	Laser Energy	Exact match	West Malling, United KingdomHQ recorded Sep 17, 2026	51-200	93 contacts →
	Exact match “At LASER Energy, part of the Commercial Services Group Energy & Environment portfolio, a wholly-owned business unit of Kent County Council, we help public sector organisations…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Agilityeco	Exact match	Sutton, United KingdomHQ recorded Sep 17, 2026	51-200	90 contacts →
	Exact match “At AgilityEco our vision is a warm, healthy home for everyone.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	Livgreen	Exact match	Bristol, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
15	Sustainable Building Services UK LTD	Exact match	Skelmersdale, United KingdomHQ recorded Sep 17, 2026	51-200	82 contacts →
	Exact match “Are you looking for a specialist retrofit decarbonisation & energy efficiency contractor?” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	YES Energy Solutions	Exact match	Halifax, United KingdomHQ recorded Sep 17, 2026	51-200	81 contacts →
	Exact match “YES Energy Solutions is a company with a strong social purpose.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	Vibrant Energy Matters	Exact match	Blackwood, United KingdomHQ recorded Sep 17, 2026	51-200	81 contacts →
	Exact match “Established in 2008 to carry out EPCs, our services expanded from 2015 to include all residential property services.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	Evergen Solar	Exact match	Maidenhead, United KingdomHQ recorded Sep 17, 2026	51-200	79 contacts →
	Exact match “Fully funded solar solutions specialising in Commercial and Residential Solar with Battery.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Next Energy	Exact match	Knowsley, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
20	ECO Approach	Exact match	Beckenham, United KingdomHQ recorded Sep 17, 2026	51-200	67 contacts →
	Exact match “We’re a leading nationwide property services company established in 2013.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	21 Degrees	Exact match	Nationwide, United KingdomHQ recorded Sep 17, 2026	201-500	65 contacts →
	Exact match “At 21 Degrees, we believe buildings should be designed for lower energy use, healthier spaces and better comfort.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Birdsall Group LTD	Exact match	Hemel Hempstead, United KingdomHQ recorded Sep 17, 2026	51-200	64 contacts →
	Exact match “Our History Birdsall are an innovative company with a 48-year track record of delivering energy efficiency and environmental solutions to our clients.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Cenergist	Exact match	Washington, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
24	Scis Group	Exact match	Fareham, United KingdomHQ recorded Sep 17, 2026	51-200	60 contacts →
	Exact match “Hello.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	The Improveasy Group	Exact match	Altrincham, United KingdomHQ recorded Sep 17, 2026	51-200	58 contacts →
	Exact match “Energy solutions made easy.” Recorded in the RevenueBase company graph · Sep 17, 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 “residential 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 1,395 residential energy efficiency companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 7,766 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Sep 17, 2026

32.6%Verified-email coverage

17.1Average contacts per company

1-10Median size (employees)

10.1%Largest-city concentration · London

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

747

11-50

491

51-200

112

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 1,395 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 “residential 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 7,766 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 17, 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.

Residential energy efficiency companies by metro

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 “residential energy efficiency companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 1,395 company matches for residential 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 residential energy efficiency companies?

London leads with 141 company records, followed by Manchester (30) and Birmingham (29).

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 7,766 professional contacts with verified work emails tracked across these 1,395 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 17, 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.