Company lists · Data refreshed October 2026

Top 25 Energy efficient home upgrade contractors based in the United Kingdom

Name: Energy efficient home upgrade contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 12, 2026 790 companies tracked

RevenueBase identified 790 company matches for energy efficient home upgrade contractors associated with the United Kingdom as of October 2026 and tracks 5,597 professional contacts across them, including 1,673 with verified work emails. London is the largest hub.

This list covers company matches for energy efficient home upgrade contractors 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 October 12, 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 Oct 12, 2026 How this list was built

790Companies

5,597Contacts tracked

1,673Verified emails

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The 25 largest energy efficient home upgrade contractors based in the United Kingdom

Ranked by team size

Top 25 of 790 company matches for energy efficient home upgrade contractors based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 12, 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	Glow Green	Exact match	Bournemouth, United KingdomHQ recorded Oct 12, 2026	51-200	121 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 · Oct 12, 2026 · View company records in RevenueBase
2	Livgreen	Exact match	Bristol, United KingdomHQ recorded Oct 12, 2026	201-500	111 contacts →
	Exact match “We are a leading provider of retrofit residential decarbonisation across the UK.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
3	Correct Contract Services CCS	Exact match	Andover, United KingdomHQ recorded Oct 12, 2026	201-500	109 contacts →
	Exact match “Correct Contract Services (CCS) is a trusted main contractor for compliance and energy services, expertly serving social housing landlords across the UK.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
4	Instagroup LTD	Exact match	Finchampstead, United KingdomHQ recorded Oct 12, 2026	51-200	99 contacts →
	Exact match “Established in 1980, InstaGroup are a UK leader in the energy efficiency industry, covering commercial and residential projects.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
5	BOXT	Exact match	Leeds, United KingdomHQ recorded Oct 12, 2026	51-200	96 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 · Oct 12, 2026 · View company records in RevenueBase
6	City Energy Network	Exact match	Cardiff, United KingdomHQ recorded Oct 12, 2026	51-200	93 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 · Oct 12, 2026 · View company records in RevenueBase
7	Purdy Part Of Sureserve	Exact match	London, United KingdomHQ recorded Oct 12, 2026	201-500	78 contacts →
	Exact match “Who are we?” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
8	Next Energy	Exact match	Knowsley, United KingdomHQ recorded Oct 12, 2026	51-200	75 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 · Oct 12, 2026 · View company records in RevenueBase
9	ECO Approach	Exact match	Beckenham, United KingdomHQ recorded Oct 12, 2026	51-200	63 contacts →
	Exact match “We’re a leading nationwide property services company established in 2013.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
10	Broad OAK Group	Exact match	Kingsley Moor, United KingdomHQ recorded Oct 12, 2026	201-500	58 contacts →
	Exact match “Delivering Excellence in Housing Decarbonisation Broad Oak specialises in delivering high-quality decarbonisation and retrofit solutions.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
11	IZ Energy Services LTD	Exact match	Barking, United KingdomHQ recorded Oct 12, 2026	51-200	54 contacts →
	Exact match “IZ Energy is pioneering a sustainable future.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
12	GSL	Exact match	Wigan, United KingdomHQ recorded Oct 12, 2026	51-200	50 contacts →
	Exact match “At Grant Store Ltd (GSL), we specialise in delivering bespoke renewable energy solutions nationwide.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
13	Cotswold Energy Group	Exact match	Stonehouse, United KingdomHQ recorded Oct 12, 2026	51-200	47 contacts →
	Exact match “Secure your greener future with renewable energy solutions!” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
14	The Improveasy Group	Exact match	Altrincham, United KingdomHQ recorded Oct 12, 2026	51-200	46 contacts →
	Exact match “Energy solutions made easy.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
15	Sureserve Energy Services North	Exact match	Brighouse, United KingdomHQ recorded Oct 12, 2026	1,001-5,000	45 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 · Oct 12, 2026 · View company records in RevenueBase
16	Green Home Systems	Exact match	Irvine, United KingdomHQ recorded Oct 12, 2026	51-200	42 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 · Oct 12, 2026 · View company records in RevenueBase
17	Golden Globe Merchants LTD	Exact match	London, United KingdomHQ recorded Oct 12, 2026	11-50	42 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 · Oct 12, 2026 · View company records in RevenueBase
18	Effective Home	Exact match	Doncaster, United KingdomHQ recorded Oct 12, 2026	51-200	41 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 · Oct 12, 2026 · View company records in RevenueBase
19	ECO Providers	Exact match	Clitheroe, United KingdomHQ recorded Oct 12, 2026	51-200	41 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 · Oct 12, 2026 · View company records in RevenueBase
20	B-Engineering Group Certified B Corp	Exact match	Warrington, United KingdomHQ recorded Oct 12, 2026	51-200	38 contacts →
	Exact match “We are a purpose driven engineering business, passionate about our people and the environment.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
21	Homelogic	Exact match	Southampton, United KingdomHQ recorded Oct 12, 2026	51-200	38 contacts →
	Exact match “Homelogic®, based in Southampton, Hampshire, are an innovative, forward-thinking company dedicated to bringing eco-friendly, cost effective energy saving solutions to the homes…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
22	Solmatix Renewables LTD	Exact match	Dundrod Rd, United KingdomHQ recorded Oct 12, 2026	11-50	38 contacts →
	Exact match “Founded in 2008, Solmatix is one of the UK's and Ireland's leading renewable energy specialists, delivering innovative, high-quality energy solutions for commercial, industrial…” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
23	Avonside Energy	Exact match	Rearsby, United KingdomHQ recorded Oct 12, 2026	201-500	37 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 · Oct 12, 2026 · View company records in RevenueBase
24	Forster Group	Exact match	Brechin, United KingdomHQ recorded Oct 12, 2026	51-200	34 contacts →
	Exact match “Forster Group is one of Scotland’s leading renewable energy and roofing specialists, combining over three decades of expertise with a forward-thinking approach.” Recorded in the RevenueBase company graph · Oct 12, 2026 · View company records in RevenueBase
25	CWG Group LTD	Exact match	Stevenage, United KingdomHQ recorded Oct 12, 2026	11-50	32 contacts →
	Exact match “CWG Group is your dedicated partner in creating energy-efficient, sustainable, and environmentally responsible solutions that stand the test of time.” Recorded in the RevenueBase company graph · Oct 12, 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 “energy efficient home upgrade contractors”. 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 790 energy efficient home upgrade contractors based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 1,673 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Energy efficient home upgrade contractors based in the United Kingdom at a glance

As of Oct 12, 2026

29.9%Verified-email coverage

7.1Average contacts per company

11-50Median size (employees)

7.1%Largest-city concentration · London

Oct 12, 2026Page data refreshed

Companies by employee count

1-10

369

11-50

317

51-200

201-500

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 790 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 “energy efficient home upgrade contractors” 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 1,673 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 October 12, 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.

Energy efficient home upgrade contractors by metro

Energy efficient home upgrade contractors in London56

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 “energy efficient home upgrade contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many energy efficient home upgrade contractors are there based in the United Kingdom?

RevenueBase identified 790 company matches for energy efficient home upgrade contractors associated with the United Kingdom as of October 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?

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

Which city has the most energy efficient home upgrade contractors?

London leads with 56 company records, followed by Glasgow (17) and Manchester (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 1,673 professional contacts with verified work emails tracked across these 790 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 October 12, 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.