Company lists · Data refreshed September 2026

Top 24 Building automation security companies based in London, United Kingdom

Name: Building automation security companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 8, 2026 208 companies tracked

RevenueBase identified 208 building automation security companies headquartered in London, United Kingdom as of September 2026 and tracks 2,025 professional contacts across them, including 945 with verified work emails and 98 with mobile numbers. London is the largest hub.

This list covers building automation security companies 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 8, 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 8, 2026 86% judged on-target in blind review

208Companies

2,025Contacts tracked

945Verified emails

98Mobile numbers

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The 24 largest building automation security companies based in London, United Kingdom

Ranked by team size

Top 24 of 208 building automation security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 8, 2026. RevenueBase Smart Search rates how each company's information relates to building automation security 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Gratte Brothers Group	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	501-1,000	270 contacts →
	Partial evidence “Gratte Brothers Group is a leading independent provider of comprehensive building services, renowned for exceptional quality.” Source: RevenueBase Database · checked Sep 8, 2026
2	QCIC	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	159 contacts →
	Strong evidence “QCIC is an award-winning global engineering firm specialising in designing, building and running security systems.” Source: RevenueBase Database · checked Sep 8, 2026
3	LMG Lmgiq.com	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	153 contacts →
	Indirect evidence “For 40 years, LMG has delivered secure, resilient and proven digital infrastructure solutions across the built environment.” Source: RevenueBase Database · checked Sep 8, 2026
4	Custom Intelligent Security	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	51 contacts →
	Partial 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 8, 2026
5	Sensetech Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	50 contacts →
	Partial evidence “Sensetech Systems Ltd is an LPS1014 Accredited independent Fire Alarm, Security and Structured Data Cabling Company.” Source: RevenueBase Database · checked Sep 8, 2026
6	Elmech LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	42 contacts →
	Indirect evidence “The core activities of our business are all aspects of mechanical and electrical services including air conditioning, sprinkler systems, CHW<HW, ventilation, BMS, door entry and…” Source: RevenueBase Database · checked Sep 8, 2026
7	SMC Smart Homes	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	41 contacts →
	Indirect evidence “SMC are a leading custom electronic system design, installation and aftercare company.” Source: RevenueBase Database · checked Sep 8, 2026
8	Universal Security Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	39 contacts →
	Partial 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 8, 2026
9	Link Media Systems	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	37 contacts →
	Indirect evidence “We are systems integrators.” Source: RevenueBase Database · checked Sep 8, 2026
10	Videxuk	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	36 contacts →
	Indirect 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 8, 2026
11	ECS Systems LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	35 contacts →
	Indirect evidence “Here at ECS Systems we pride ourselves on providing the highest level of personalised service, to every client.” Source: RevenueBase Database · checked Sep 8, 2026
12	Phoenix ME	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	501-1,000	33 contacts →
	Indirect evidence “We stand as a well-established industry leader, specialising in the design, installation, and commissioning of mechanical and electrical systems across diverse sectors.” Source: RevenueBase Database · checked Sep 8, 2026
13	Pafi LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	32 contacts →
	Partial evidence “Pafi Ltd, Was formed in 1995 to design, install and maintain integrated security solutions for the commercial market.” Source: RevenueBase Database · checked Sep 8, 2026
14	Okto Technologies	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	32 contacts →
	Partial evidence “Master Systems Integrator OKTO Technologies is a leader in the design, development & installation of Smart Building Technology for- SuperPrime Residential - Luxury Hospitality -…” Source: RevenueBase Database · checked Sep 8, 2026
15	ALL BMS Systems LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	27 contacts →
	Indirect evidence “All BMS Systems offer a comprehensive service covering consultancy, design, project management, engineering, installation and all essential support services.” Source: RevenueBase Database · checked Sep 8, 2026
16	Welcome Gate	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	23 contacts →
	Partial 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 8, 2026
17	Dennis Johns Service Group	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	20 contacts →
	Indirect 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 8, 2026
18	QQ Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	20 contacts →
	Partial evidence “QQ design, supply and install of residental and commercial automation technology and energy-efficient control systems.” Source: RevenueBase Database · checked Sep 8, 2026
19	Accurro LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	14 contacts →
	Partial evidence “Founded in 2002, Accurro was originally set up to be a commercial building management systems controls company.” Source: RevenueBase Database · checked Sep 8, 2026
20	Definitive Security Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	13 contacts →
	Partial 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 8, 2026
21	Square Mile Fire & Security	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	13 contacts →
	Partial evidence “We are an independent business specialising in the delivery of fire systems, as well as a comprehensive range of security systems.” Source: RevenueBase Database · checked Sep 8, 2026
22	Twentytwo Integration	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	12 contacts →
	Partial evidence “TwentyTwo Integration are experts in bringing together audio, television, lighting, telephone & communications, data networks, security & other bespoke systems into a unified…” Source: RevenueBase Database · checked Sep 8, 2026
23	Sensonic Design	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	12 contacts →
	Strong evidence “TECHNOLOGY - DESIGN - SENSONIC Building automation with Cognitive AI In the cutting-edge space Sensonic Design is a High-tech company engaged in the revolutionary integration of…” Source: RevenueBase Database · checked Sep 8, 2026
24	Securico Fire & Security	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	12 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 8, 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: building automation security companies. 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 building automation security companies.
Partial evidence: Its own public description names part of building automation security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name building automation security companies. 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 24 of 208 building automation security companies based in London, United Kingdom

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Building automation security companies based in London, United Kingdom at a glance

As of Sep 8, 2026

46.7%Verified-email coverage

4.8%Mobile-number coverage

9.7Average contacts per company

1-10Median size (employees)

101.0%Largest-city concentration · London

Sep 8, 2026Page data refreshed

Companies by employee count

1-10

109

11-50

51-200

201-500

501-1,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

8750–30

6631–60

261–90

090–180

2180+

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 building automation security 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 London, United Kingdom whose own description of what they do matches “building automation security 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 building automation security 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 building automation security companies, 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, 945 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 8, 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.

Building automation security companies by metro in the United Kingdom

Building automation security companies in London210
Building automation security companies in Manchester26

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 building automation security 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 building automation security companies are there based in London, United Kingdom?

RevenueBase identified 208 building automation security companies 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?

Gratte Brothers Group, headquartered in London, tops this list with the largest team on record.

Which city has the most building automation security companies?

London leads with 210 headquartered companies, followed by Manchester (26) and Leeds (20).

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 945 verified decision-maker contacts tracked across these 208 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 8, 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.