Company lists · Data refreshed November 2026

Top 25 Electrical system retrofitting companies based in the United Kingdom

Name: Electrical system retrofitting companies 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 2,713 companies tracked

RevenueBase identified 2,713 company matches for electrical system retrofitting companies associated with the United Kingdom as of November 2026 and tracks 14,531 professional contacts across them, including 3,780 with verified work emails. London is the largest hub.

This list covers company matches for electrical system retrofitting 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 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

2,713Companies

14,531Contacts tracked

3,780Verified emails

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The 25 largest electrical system retrofitting companies based in the United Kingdom

Ranked by team size

Top 25 of 2,713 company matches for electrical system retrofitting companies 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	Quartzelec Limited	Exact match	Rugby, United KingdomHQ recorded Nov 6, 2026	501-1,000	456 contacts →
	Exact match “Quartzelec is a leading independent electrical engineering group delivering solutions and services in both UK and global markets.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	MCS	Exact match	Bristol, United KingdomHQ recorded Nov 6, 2026	51-200	152 contacts →
	Exact match “MCS Ltd are specialist building services engineers covering all aspects of commercial and industrial building services and infrastructure engineering across varying market sectors.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Darke & Taylor LTD	Exact match	Oxfordshire, United KingdomHQ recorded Nov 6, 2026	51-200	122 contacts →
	Exact match “Our mission is to excel in the design, installation and maintenance of the electro-technical systems that connect to create fit for purpose building environments.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	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
5	Grant Walker Engineering	Exact match	London, United KingdomHQ recorded Nov 6, 2026	51-200	92 contacts →
	Exact match “Grant Walker Engineering specialise in the complete installation of Electrical and Mechanical systems across all work sectors including quality office developments, commercial and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	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
7	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
8	Primech Building Services LTD	Exact match	Gillingham, United KingdomHQ recorded Nov 6, 2026	51-200	61 contacts →
	Exact match “Primech is a specialist mechanical and electrical design and build contractor, with a strong focus on retrofit and upgrade projects across existing buildings and live environments.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	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
10	Lloyd Morris Electrical LTD	Exact match	Wrexham, United KingdomHQ recorded Nov 6, 2026	51-200	56 contacts →
	Exact match “Lloyd Morris Electrical Limited is a company of Electrical Engineers, specialising in the design, manufacture and installation of Electrical Distribution and Control Systems for…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	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
12	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
13	CD Engineering Services Limited	Exact match	Stockton-on-tees, United KingdomHQ recorded Nov 6, 2026	11-50	51 contacts →
	Exact match “Welcome to the CD Engineering Services Ltd.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	NES	Exact match	Inverness, United KingdomHQ recorded Nov 6, 2026	11-50	51 contacts →
	Exact match “NES is an Industrial and Commercial Electrical Engineering and Contracting business, based in the North and North East of Scotland.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Evans Electrical LTD	Exact match	Cardiff, United KingdomHQ recorded Nov 6, 2026	51-200	49 contacts →
	Exact match “Evans Electrical Ltd is a long established respected professional company with a highly motivated team of approximately 120 dedicated staff.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	SOL Services	Exact match	Milton Keynes, United KingdomHQ recorded Nov 6, 2026	51-200	45 contacts →
	Exact match “Based in Milton Keynes, SOL Services which was established in 2003, provide quality and reliable services in all aspects of commercial electrical installation and commercial…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	JGF Electrical	Exact match	Dartford, United KingdomHQ recorded Nov 6, 2026	11-50	45 contacts →
	Exact match “Commercial Properties Commercial projects benefit from the time we invest in team training to deliver excellent industry standards throughout.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Jordan Electrics Limited	Exact match	Motherwell, United KingdomHQ recorded Nov 6, 2026	51-200	43 contacts →
	Exact match “Jordan Electrics Limited is a family owned medium sized business with extensive experience in Domestic, Commercial, Industrial and Retail fields since 1975, and is presently under…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Process Control Services	Exact match	Buxton, United KingdomHQ recorded Nov 6, 2026	51-200	43 contacts →
	Exact match “Process Control Services (PCS) is an industrial electrical and data contractor, serving a wide range of sectors across the UK.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	NME Electrical & Solar PV	Exact match	Northampton, United KingdomHQ recorded Nov 6, 2026	51-200	41 contacts →
	Exact match “Midland's leading Electrical Contractor for New Homes Established in NME Electrical Services carry out electrical installations for a range of developers throughout the midlands…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Jlec Electrical LTD	Exact match	Bradford, United KingdomHQ recorded Nov 6, 2026	11-50	41 contacts →
	Exact match “JLEC Electrical is committed to providing premium quality along with competitive service to all customers new and old.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	JW Morris	Exact match	Bridgend, United KingdomHQ recorded Nov 6, 2026	201-500	40 contacts →
	Exact match “JW Morris is an electrical and mechanical engineering company providing installation, manufacturing and wholesaling services to industry and commerce for domestic and…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	EMI Co. LTD	Exact match	Gainsborough, United KingdomHQ recorded Nov 6, 2026	51-200	39 contacts →
	Exact match “Keeping power, water, and rail moving since 1966.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	A.Alexander Group	Exact match	Glasgow, United KingdomHQ recorded Nov 6, 2026	51-200	37 contacts →
	Exact match “Alexander Group delivers integrated infrastructure solutions that help commercial and industrial buildings operate efficiently, safely and sustainably.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Arena Electrical Services LTD	Exact match	City Of London, United KingdomHQ recorded Nov 6, 2026	51-200	37 contacts →
	Exact match “Arena Electrical Services Ltd is an independent and privately owned electrical contractors which was founded in 2005 to serve the commercial fit out sector along with the large…” 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 “electrical system retrofitting 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 2,713 electrical system retrofitting companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 3,780 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Electrical system retrofitting companies based in the United Kingdom at a glance

As of Nov 6, 2026

26.0%Verified-email coverage

5.4Average contacts per company

1-10Median size (employees)

6.5%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

1,608

11-50

839

51-200

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 2,713 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 “electrical system retrofitting 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 3,780 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.

Electrical system retrofitting 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 “electrical system retrofitting companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many electrical system retrofitting companies are there based in the United Kingdom?

RevenueBase identified 2,713 company matches for electrical system retrofitting companies 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?

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

Which city has the most electrical system retrofitting companies?

London leads with 176 company records, followed by Manchester (37) and Birmingham (35).

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 3,780 professional contacts with verified work emails tracked across these 2,713 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.