Company lists · Data refreshed November 2026

Top 25 Building electrification contractors based in the United Kingdom

Name: Building electrification contractors based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 4,996 companies tracked

RevenueBase identified 4,996 company matches for building electrification contractors associated with the United Kingdom as of November 2026 and tracks 26,674 professional contacts across them, including 7,137 with verified work emails. London is the largest hub.

This list covers company matches for building electrification 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 November 6, 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 Nov 6, 2026 How this list was built

4,996Companies

26,674Contacts tracked

7,137Verified emails

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The 25 largest building electrification contractors based in the United Kingdom

Ranked by team size

Top 25 of 4,996 company matches for building electrification contractors based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	Calisen	Exact match	Manchester, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	772 contacts →
	Exact match “We are Calisen.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Clarkson Evans LTD	Exact match	Gloucester, United KingdomHQ recorded Nov 6, 2026	501-1,000	360 contacts →
	Exact match “With over 850 staff, we are one of the UK’s leading electrical contractors and solar PV installers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Enerveo	Exact match	Birmingham, United KingdomHQ recorded Nov 6, 2026	1,001-5,000	332 contacts →
	Exact match “Enerveo is a multi-disciplinary contracting business, with the skills and expertise to deliver complex projects in complex environments across a number of different service lines.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Smith & Byford	Exact match	Cheam, United KingdomHQ recorded Nov 6, 2026	201-500	144 contacts →
	Exact match “Smith & Byford is a family-owned and operated building services company.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	AES	Exact match	Enfield, United KingdomHQ recorded Nov 6, 2026	201-500	123 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 · Nov 6, 2026 · View company records in RevenueBase
6	G & A Barnie Group LTD	Exact match	Inverness, United KingdomHQ recorded Nov 6, 2026	201-500	120 contacts →
	Exact match “Premier quality workmanship and personal attention are characteristics of G&A Barnie.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Livgreen	Exact match	Bristol, United KingdomHQ recorded Nov 6, 2026	201-500	117 contacts →
	Exact match “We are a leading provider of retrofit residential decarbonisation across the UK.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Rock Power Connections LTD	Exact match	Bromsgrove, United KingdomHQ recorded Nov 6, 2026	51-200	110 contacts →
	Exact match “Rock Power Connections are experts in electrical connections with a proven track record of quality and safety.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	Sinewave	Exact match	Swindon, United KingdomHQ recorded Nov 6, 2026	51-200	109 contacts →
	Exact match “Sinewave are a specialist engineering company who provide High and Low voltage electrical services across the UK.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Eenergy	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	96 contacts →
	Exact match “eEnergy (AIM: EAAS) is a UK-based Energy-as-a-Service (EaaS) provider, funding and delivering energy-saving and energy-generating solutions across multi-site public sector and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	BOXT	Exact match	Leeds, United KingdomHQ recorded Nov 6, 2026	51-200	93 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 · Nov 6, 2026 · View company records in RevenueBase
12	Purdy Part Of Sureserve	Exact match	London, United KingdomHQ recorded Nov 6, 2026	201-500	85 contacts →
	Exact match “Who are we?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	AKD	Exact match	Edinburgh, United KingdomHQ recorded Nov 6, 2026	51-200	82 contacts →
	Exact match “AKD’s clients get quick results, normally leading to reduced costs and gaining an improved service.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	ECO Approach	Exact match	Beckenham, United KingdomHQ recorded Nov 6, 2026	51-200	67 contacts →
	Exact match “We’re a leading nationwide property services company established in 2013.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	ARC Tech Scotland LTD	Exact match	Cambuslang, United KingdomHQ recorded Nov 6, 2026	51-200	67 contacts →
	Exact match “Arc-Tech (Scotland) is a leading Building Services provider based in Glasgow.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Alt-Group	Exact match	Worcester, United KingdomHQ recorded Nov 6, 2026	51-200	65 contacts →
	Exact match “Alt-Group is a forward-thinking, renewable energy company; advising on, installing and maintaining excellent renewable systems including Solar PV, EV Charging & Batteries.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Premier Electrics	Exact match	Magherafelt, United KingdomHQ recorded Nov 6, 2026	51-200	62 contacts →
	Exact match “Premier Electrics have been delivering exciting projects throughout Ireland, UK and Europe since 1993.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	The Wiggett Group LTD	Exact match	Brentwood, United KingdomHQ recorded Nov 6, 2026	201-500	61 contacts →
	Exact match “Wiggett Electrical has gone from strength to strength.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Evoenergy	Exact match	Nottingham, United KingdomHQ recorded Nov 6, 2026	11-50	58 contacts →
	Exact match “Driving the market through innovation, EvoEnergy are the UK’s leading energy technology solutions provider, helping blue-chip clients and SME’s turn their sites into ‘sustainable…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Fixatex LTD	Exact match	Hertford, United KingdomHQ recorded Nov 6, 2026	51-200	57 contacts →
	Exact match “Electrical & Fire Protection Services, Domestic & Commercial.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Cleaner Group	Exact match	Wakefield, United KingdomHQ recorded Nov 6, 2026	11-50	57 contacts →
	Exact match “Cleaner Group is a UK leader in full turnkey renewable energy solutions; primarily for commercial EV charging and solar PV.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	RJ Power	Exact match	Sidcup, United KingdomHQ recorded Nov 6, 2026	51-200	56 contacts →
	Exact match “RJ Power Group is a specialist electrical contracting business, providing engineering solutions in the power sector.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Powercor LTD	Exact match	Weybridge, United KingdomHQ recorded Nov 6, 2026	51-200	54 contacts →
	Exact match “Since 1998, Powercor have specialised in every aspect of electrical engineering.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	NRT Group	Exact match	Banstead, United KingdomHQ recorded Nov 6, 2026	51-200	52 contacts →
	Exact match “Our aim is to be the first choice for electrical and engineering installations.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Cotswold Energy Group	Exact match	Stonehouse, United KingdomHQ recorded Nov 6, 2026	51-200	51 contacts →
	Exact match “Secure your greener future with renewable energy solutions!” Recorded in the RevenueBase company graph · Nov 6, 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 “building electrification 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 4,996 building electrification contractors based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 7,137 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Building electrification contractors based in the United Kingdom at a glance

As of Nov 6, 2026

26.8%Verified-email coverage

5.3Average contacts per company

1-10Median size (employees)

6.7%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

3,055

11-50

1,401

51-200

167

201-500

501-1,000

1,001-5,000

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 4,996 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 “building electrification 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 7,137 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 November 6, 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.

Building electrification contractors 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 “building electrification contractors”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many building electrification contractors are there based in the United Kingdom?

RevenueBase identified 4,996 company matches for building electrification contractors associated with the United Kingdom as of November 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?

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

Which city has the most building electrification contractors?

London leads with 333 company records, followed by Manchester (67) and Nottingham (60).

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 7,137 professional contacts with verified work emails tracked across these 4,996 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 November 6, 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.