Company lists · Data refreshed September 2026

Top 25 Access control system contractors based in London, United Kingdom

Name: Access control system contractors based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 98 companies tracked

RevenueBase identified 98 access control system contractors headquartered in London, United Kingdom as of September 2026 and tracks 725 professional contacts across them, including 214 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers access control system contractors headquartered in London, 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 30, 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 30, 2026 86% judged on-target in blind review

98Companies

725Contacts tracked

214Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest access control system contractors based in London, United Kingdom

Ranked by team size

Top 25 of 98 access control system contractors based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to access control system contractors: 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	WLS	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	61 contacts →
	Indirect evidence “WLS (West London Security) has been providing security and solutions to London's homes and businesses for over 40 years.” Source: RevenueBase Database · checked Sep 30, 2026
2	Custom Intelligent Security	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	51 contacts →
	Indirect evidence “Established in Custom Intelligent Security is a technology driven ISO27001 & NSi Gold Accredited independent electronic security specialist with a proven track record of…” Source: RevenueBase Database · checked Sep 30, 2026
3	Universal Security Systems LTD	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	39 contacts →
	Strong evidence “Universal Security Systems Limited is a specialist provider of installation and maintenance services for all types of security systems including Access Control, Closed Circuit…” Source: RevenueBase Database · checked Sep 30, 2026
4	Videxuk	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	36 contacts →
	Strong evidence “We are the experts in door entry and access control and have been supplying and manufacturing systems for 40 years.” Source: RevenueBase Database · checked Sep 30, 2026
5	Pafi LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	32 contacts →
	Indirect evidence “Pafi Ltd, Was formed in 1995 to design, install and maintain integrated security solutions for the commercial market.” Source: RevenueBase Database · checked Sep 30, 2026
6	DS Security Group LTD	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	27 contacts →
	Strong evidence “CCTV and Access Control Service and installation specialists Established in 1993 DS Security prides itself on customer service.” Source: RevenueBase Database · checked Sep 30, 2026
7	Welcome Gate	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	23 contacts →
	Strong evidence “Who are you… Most likely you are a Workplace or IT Professional with a lot on your plate including physical electronic security systems, such as - Access control - CCTV - Intruder…” Source: RevenueBase Database · checked Sep 30, 2026
8	Dennis Johns Service Group	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	20 contacts →
	Strong evidence “The Dennis Johns Service Group is a forward thinking group of companies providing, Electrical, CCTV and Access Control, installation and maintenance contracting services.” Source: RevenueBase Database · checked Sep 30, 2026
9	Definitive Security Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	13 contacts →
	Strong evidence “Definitive Security Solutions are an established designer, installer and maintainer of security, CCTV, intruder alarms, access control, power and data, and fire detection systems.” Source: RevenueBase Database · checked Sep 30, 2026
10	OPEM	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	13 contacts →
	Strong evidence “We design, install and maintain CCTV and access control systems across a variety of commercial office sectors including coworking, serviced offices and traditional office design.” Source: RevenueBase Database · checked Sep 30, 2026
11	Securico Fire & Security	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	12 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 30, 2026
12	LDN Security Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	10 contacts →
	Partial evidence “London-based security company specialising in the design, installation, service and maintenance of single domestic, multi-occupancy residential and commercial security systems.” Source: RevenueBase Database · checked Sep 30, 2026
13	Delta Security 1962 LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	8 contacts →
	Indirect evidence “Our goal is so simple we can sum it up in one word - quality.” Source: RevenueBase Database · checked Sep 30, 2026
14	Doordeck NOW Sentry Interactive LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	7 contacts →
	Indirect evidence “Doordeck is now Sentry Interactive.” Source: RevenueBase Database · checked Sep 30, 2026
15	Virtus	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	7 contacts →
	Partial evidence “Virtus Security are a professional security systems installer with over 20 years of experience within the industry, specialising in the We pride ourselves on the quality of our…” Source: RevenueBase Database · checked Sep 30, 2026
16	Security Installation Services LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	7 contacts →
	Indirect evidence “Security Installation Services Ltd provide a fast and efficient security service across Greater London and North Kent that includes the installation and maintenance of a wide…” Source: RevenueBase Database · checked Sep 30, 2026
17	Ansador Fire & Security	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	6 contacts →
	Partial evidence “Ansador Ltd has been privately owned since it was founded in 1982, providing system solutions to corporate and global clients across EMEA.” Source: RevenueBase Database · checked Sep 30, 2026
18	London Security Automation Limited	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	5 contacts →
	Partial evidence “London Security Automation Limited is a Security Systems company located in Unit 6, The Courtyard Business Centre, Birling Road, Ryarsh, Kent, ME19 5AA We at London Security…” Source: RevenueBase Database · checked Sep 30, 2026
19	Intes UK	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	5 contacts →
	Partial evidence “London based security systems integrator presently engaged on some of the most existing London landmark buildings.” Source: RevenueBase Database · checked Sep 30, 2026
20	Security Gates 'r' US	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	4 contacts →
	Partial evidence “Security Gates R Us is a leading manufacturer and installer of premium automated gates, driveway gates, security and fire rated doors, railings, fencing and advanced access…” Source: RevenueBase Database · checked Sep 30, 2026
21	Controlled LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	4 contacts →
	Indirect evidence “is a leading provider of integrated network security and fire detection solutions.” Source: RevenueBase Database · checked Sep 30, 2026
22	Ge4orce Fire & Security Solutions	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	1-10	4 contacts →
	Strong evidence “We provide CCTV, alarm systems, access control and fire safety solutions for residential and commercial properties across London.” Source: RevenueBase Database · checked Sep 30, 2026
23	Balthorne Security Solutions LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	4 contacts →
	Indirect evidence “At Balthorne Security Solutions, we understand the risks people face and the importance of reliable security.” Source: RevenueBase Database · checked Sep 30, 2026
24	Chase Automation LTD	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Strong evidence “At Chase Automation Ltd, we specialise in the supply, installation, and maintenance of high-quality security and access automation systems across the UK.” Source: RevenueBase Database · checked Sep 30, 2026
25	ELITE	Strong evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	3 contacts →
	Strong evidence “Do you want to access your security systems at home or remotely?” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: access control system contractors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names access control system contractors.
Partial evidence: Its own public description names part of access control system contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name access control system contractors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 98 access control system contractors based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 214 reachable decision-makers.

Free signup · no credit card

View the full list →

Access control system contractors based in London, United Kingdom at a glance

As of Sep 30, 2026

29.5%Verified-email coverage

7.4Average contacts per company

1-10Median size (employees)

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

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 98 companies.

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 access control system contractors, 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 London, United Kingdom whose own description of what they do matches “access control system contractors”. 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 access control system contractors), 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 access control system contractors, and records with no verified work email. Companies headquartered outside London 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, 214 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 30, 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 access control system contractors, 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 access control system contractors are there based in London, United Kingdom?

RevenueBase identified 98 access control system contractors headquartered in London, 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?

WLS, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most access control system contractors?

London leads the United Kingdom with 98 headquartered companies, followed by Manchester (15) and Glasgow (11).

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 214 verified decision-maker contacts tracked across these 98 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 30, 2026.

Ready to reach these companies? Verified emails and direct dials for all 98 access control system contractors based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Access control system contractors by geography

Browse the directory

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.