Company lists · Data refreshed September 2026

Top 25 Residential energy efficiency companies based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 141 companies tracked

RevenueBase identified 141 company matches for residential energy efficiency companies associated with London, United Kingdom as of September 2026 and tracks 1,061 professional contacts across them, including 396 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for residential energy efficiency companies associated with London, 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

141Companies

1,061Contacts tracked

396Verified emails

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The 25 largest residential energy efficiency companies based in London, United Kingdom

Ranked by team size

Top 25 of 141 company matches for residential energy efficiency companies based in London, 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	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
2	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
3	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
4	Golden Globe Merchants LTD	Exact match	London, United KingdomHQ recorded Sep 17, 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 17, 2026 · View company records in RevenueBase
5	Infinity Renewables Group	Exact match	London, United KingdomHQ recorded Sep 17, 2026	51-200	32 contacts →
	Exact match “Infinity is a leading full service residential and commercial solar provider.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
6	Airex Technologies	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	27 contacts →
	Exact match “AirEx is a rapidly growing climate tech company with the mission to tackle climate change and fuel poverty.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
7	Heat Geek	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	26 contacts →
	Exact match “Heat Geek is renewing the heating industry.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Solivus	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	21 contacts →
	Exact match “Solivus are on a mission to decarbonise the built environment with lightweight solar, meaning businesses and homeowners can reduce their climate impact, increase energy security…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	DOMNA	Exact match	London, United KingdomHQ recorded Sep 17, 2026	51-200	18 contacts →
	Exact match “At Domna, we are on a mission to make every home in Great Britain green and sustainable.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Simple Green Energy LTD	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	17 contacts →
	Exact match “Simple Green Energy \| Empowering Homes with Sustainable Solutions At Simple Green Energy, we’re committed to helping households across England and Wales reduce energy bills…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Sustain Certified B Corp	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	16 contacts →
	Exact match “Our mission is to help make our customers’ homes smarter, more efficient and cost less to run while helping the world get a cleaner energy system.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Parity Projects	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	13 contacts →
	Exact match “Our mission is to provide the most cost-effective route to Net Zero for the UK’s homes.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Elight IS NOW Eenergy	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	12 contacts →
	Exact match “About eEnergy Group plc eEnergy (AIM: EAAS) is a digital energy services company, empowering organisations to achieve net zero by tackling energy waste and transitioning to clean…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	Installio	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	11 contacts →
	Exact match “Installio is a clean energy delivery partner supporting solar, battery and heat pump upgrades across the UK.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	Upvolt	Exact match	London, United KingdomHQ recorded Sep 17, 2026	51-200	11 contacts →
	Exact match “Upvolt helps homeowners take control of their energy with smart solar, heating and home energy management systems.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Britain Energy	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	11 contacts →
	Exact match “Revamp Your Home’s Energy Efficiency at Zero Expense!” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	Twenty ONE Engineering	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	10 contacts →
	Exact match “We offer a world leading Energy and Engineering support to our clients.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	Econest	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	8 contacts →
	Exact match “Econest is an AI-enabled asset manager that sources and purchases energy inefficient properties to retrofit and manage at scale for large investment portfolios.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Dwellow	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	6 contacts →
	Exact match “We make home upgrades simple.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	BIG Clean Switch	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	6 contacts →
	Exact match “Working with some of the world's biggest companies to help homes and businesses cut carbon and save money.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	Nxgen Solar	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	6 contacts →
	Exact match “NXGEN Solar is a UK-based company that provides innovative, efficient and cost-effective solar power solutions to a wide range of customers from government level to industrial and…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Quimera Energy Efficiency	Exact match	London, United KingdomHQ recorded Sep 17, 2026	11-50	6 contacts →
	Exact match “Quimera Energy Efficiency (QEE) develops energy efficiency projects focused on creating energy savings and reducing operational costs, using the latest sustainable technologies.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Co2 Controls LTD	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	5 contacts →
	Exact match “Our goal is to optimise energy use and reduce operating costs - helping you achieve your business and environmental goals.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	Renbee	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	5 contacts →
	Exact match “Renbee was founded by to help tackle the climate crisis, the greatest challenge of our lifetime.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	Onroute	Exact match	London, United KingdomHQ recorded Sep 17, 2026	1-10	5 contacts →
	Exact match “Established in 2008, Onroute has enabled our customers to deliver over 1M low carbon tech installations.” 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 141 residential energy efficiency companies based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 396 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Residential energy efficiency companies based in London, United Kingdom at a glance

As of Sep 17, 2026

37.3%Verified-email coverage

7.5Average contacts per company

1-10Median size (employees)

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 141 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 London, 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 396 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 in the United Kingdom

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 London, United Kingdom?

RevenueBase identified 141 company matches for residential energy efficiency companies associated with London, 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?

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

Which city in the United Kingdom has the most residential energy efficiency companies?

London leads the United Kingdom 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 396 professional contacts with verified work emails tracked across these 141 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.