Company lists · Data refreshed September 2026

Top 25 Security system installation companies based in the United Kingdom

RevenueBase identified 2,220 security system installation companies headquartered in the United Kingdom as of September 2026 and tracks 20,418 professional contacts across them, including 7,015 with verified work emails and 891 with mobile numbers. London is the largest hub.

This list covers security system installation companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 6, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 6, 2026 86% judged on-target in blind review
2,220Companies
20,418Contacts tracked
7,015Verified emails
891Mobile numbers
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The 25 largest security system installation companies based in the United Kingdom

Ranked by team size
Top 25 of 2,220 security system installation companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 2026. RevenueBase Smart Search rates how each company's information relates to security system installation companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceStaines, United KingdomHQ checked Sep 6, 202610001+6,169 contacts →

“Making the world a safer place.”

Source: company website · checked Sep 6, 2026
2Strong evidenceBlackburn, United KingdomHQ checked Sep 6, 2026n/a393 contacts →

“At Global Security Ltd, we are proud to be one of the UK’s trusted suppliers of CCTV, intruder alarms, access control, and fire safety systems.”

Source: company website · checked Sep 6, 2026
3Partial evidenceManchester, United KingdomHQ checked Sep 6, 2026501-1,000389 contacts →

“Mitie Fire & Security is part of Mitie, the UK’s leading facilities management and professional services company, delivering integrated fire and security solutions that protect…”

Source: company website · checked Sep 6, 2026
4Partial evidenceBradford, United KingdomHQ checked Sep 6, 2026501-1,000326 contacts →

“Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.”

Source: company website · checked Sep 6, 2026
5Partial evidenceRomford, United KingdomHQ checked Sep 6, 2026201-500200 contacts →

“OpenView Security Solutions is the UK’S largest privately owned independent security company and provides unique, innovative and technologically excellent solutions to meet…”

Source: company website · checked Sep 6, 2026
6Partial evidenceLeeds, United KingdomHQ checked Sep 6, 202651-200157 contacts →

“A premier provider of security products and services across England, Gough & Kelly was formed in 1988 to influence and inspire the security and electrical marketplace by providing…”

Source: company website · checked Sep 6, 2026
7Strong evidenceChalfont St Peter, United KingdomHQ checked Sep 6, 202651-200145 contacts →

“Frontline Security Solutions is a global electronic security integrator specialising in Access Control, CCTV, Intruder and Intercom systems that protect people, property and…”

Source: company website · checked Sep 6, 2026
8Partial evidenceLondon, United KingdomHQ checked Sep 6, 202651-200137 contacts →

“The Keyholding Company are a tech-enabled mobile security services company, specialising in alarm response, mobile patrols, locks and unlocks, emergency and temporary guarding…”

Source: company website · checked Sep 6, 2026
9Strong evidenceNottingham, United KingdomHQ checked Sep 6, 202651-200119 contacts →

“Global Fire and Security Systems are market leaders in providing quality product solutions to services through the Fire and Security market place nationwide.”

Source: company website · checked Sep 6, 2026
10Strong evidenceWatford, United KingdomHQ checked Sep 6, 202651-200116 contacts →

“TSP has a reputation for providing enterprise security solutions, as well as excellent system integration standards and exceptional aftercare support, since its founding in 1988.”

Source: company website · checked Sep 6, 2026
11Partial evidenceHounslow, United KingdomHQ checked Sep 6, 2026201-50089 contacts →

“For a better service and competitive price try K4 Security Services At K4 we offer the following: 1.”

Source: company website · checked Sep 6, 2026
12Partial evidenceWhiteley, United KingdomHQ checked Sep 6, 2026501-1,00087 contacts →

“Croma Security Solutions Group (CSSG) began in 1970 as a family-run business in Shirley, Southampton, known as County Locksmiths.”

Source: company website · checked Sep 6, 2026
13Partial evidenceChertsey, United KingdomHQ checked Sep 6, 2026201-50087 contacts →

“Scutum Fire & Security Ltd.”

Source: company website · checked Sep 6, 2026
14Strong evidenceOrpington, United KingdomHQ checked Sep 6, 2026201-50071 contacts →

“Spy Alarms is probably the largest privately owned business installing security systems in the South East, started by Martin Foster after his own house was burgled and he could…”

Source: company website · checked Sep 6, 2026
15Strong evidenceLeicester, United KingdomHQ checked Sep 6, 202651-20070 contacts →

“With over 50 years’ experience in the security industry, Abel has grown to become one of the UK’s largest privately owned providers of electronic security systems.”

Source: company website · checked Sep 6, 2026
16Partial evidenceCarlisle, United KingdomHQ checked Sep 6, 2026201-50069 contacts →

“Northern Security Ltd is a leading guarding, alarm response and electronic security business operating throughout the North of England and South West Scotland.”

Source: company website · checked Sep 6, 2026
17Partial evidenceLondon, United KingdomHQ checked Sep 6, 2026201-50064 contacts →

“City Security Services (CSS) have more than 25 years’ experience within the corporate security, public sector, education and social housing markets delivering manned guarding…”

Source: company website · checked Sep 6, 2026
18Strong evidenceTrowbridge, United KingdomHQ checked Sep 6, 202651-20061 contacts →

“AlertSystems specialise in the design, installation, service, and maintenance of commercial electronic security and fire safety systems.”

Source: company website · checked Sep 6, 2026
19Partial evidenceLondon, United KingdomHQ checked Sep 6, 202651-20061 contacts →

“WLS (West London Security) has been providing security and solutions to London's homes and businesses for over 40 years.”

Source: company website · checked Sep 6, 2026
20Partial evidenceSouthend-on-sea, United KingdomHQ checked Sep 6, 202651-20056 contacts →

“PFS Group Limited is an independently owned Fire & Security company that has been established since 1998.”

Source: company website · checked Sep 6, 2026
21Strong evidenceKnaresborough, United KingdomHQ checked Sep 6, 202611-5055 contacts →

“At Logic Fire and Security we design, supply, install, commission and maintain fire detection systems and electronic security systems throughout the UK.”

Source: company website · checked Sep 6, 2026
22Partial evidenceHemel Hempstead, United KingdomHQ checked Sep 6, 202651-20054 contacts →

“NACD Ltd has been established for over 25 years and are industry-leading UK and European specialists in manufacturing, distribution, design, installation, commissioning and…”

Source: company website · checked Sep 6, 2026
23Strong evidenceBedford, United KingdomHQ checked Sep 6, 202651-20052 contacts →

“Established in 1990, Ace Fire & Security is an end-to-end security, occupant safety, systems integration, monitoring and fire solutions specialist for commercial, industrial site…”

Source: company website · checked Sep 6, 2026
24Strong evidenceWolverhampton, United KingdomHQ checked Sep 6, 202651-20052 contacts →

“The Thompson Group offer specialist design, installation, service and maintenance of integrated security, fire, communications, audio visual and life safety systems for…”

Source: company website · checked Sep 6, 2026
25Strong evidenceGateshead, United KingdomHQ checked Sep 6, 2026201-50052 contacts →

“The Protector Group are a multi disciplined security company specializing in Manned Guarding, CCTV installation, maintenance and monitoring, Intruder and Fire alarm installation…”

Source: company website · checked Sep 6, 2026

Showing 25 of 2,220 security system installation companies based in the United Kingdom

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Security system installation companies based in the United Kingdom at a glance

As of Sep 6, 2026
34.4%Verified-email coverage
4.4%Mobile-number coverage
9.2Average contacts per company
1-10Median size (employees)
10.1%Largest-city concentration · London
Sep 6, 2026Page data refreshed

Companies by employee count

1-10
1,352
11-50
648
51-200
154
201-500
24
501-1,000
5
1,001-5,000
2
10001+
1

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among security system installation companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in the United Kingdom whose own description of what they do matches “security system installation companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search
RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names security system installation companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude
Companies whose own description does not clearly place them among security system installation companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 7,015 across the full list. 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 6, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names security system installation companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many security system installation companies are there based in the United Kingdom?

RevenueBase identified 2,220 security system installation companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Chubb Fire & Security, headquartered in Staines, tops this list with the largest team on record.

Which city has the most security system installation companies?

London leads with 224 headquartered companies, followed by Manchester (43) and Birmingham (34).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 7,015 verified decision-maker contacts tracked across these 2,220 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 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 Smart Search, 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.