Company lists · Data refreshed September 2026

Top 25 Energy management system contractors based in London, United Kingdom

Name: Energy management 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 16, 2026 140 companies tracked

RevenueBase identified 140 energy management system contractors headquartered in London, United Kingdom as of September 2026 and tracks 2,387 professional contacts across them, including 1,233 with verified work emails. London is the largest hub.

This list covers energy management 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 16, 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 16, 2026 86% judged on-target in blind review

140Companies

2,387Contacts tracked

1,233Verified emails

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The 25 largest energy management system contractors based in London, United Kingdom

Ranked by team size

Top 25 of 140 energy management system contractors based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to energy management 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	Dalkia UK	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	5,001-10,000	1,064 contacts →
	Partial evidence “Together, we’re delivering technical solutions for a better society and an Electric Britain Dalkia is one of the UK’s leading technical and energy services providers at the…” Source: RevenueBase Database · checked Sep 16, 2026
2	best.energy	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	97 contacts →
	Partial evidence “Best.Energy is a UK based company specialising in the measurement, control and reduction of energy consumption and costs within the industrial, commercial and public sectors.” Source: RevenueBase Database · checked Sep 16, 2026
3	Purdy Part Of Sureserve	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	201-500	85 contacts →
	Indirect evidence “Who are we?” Source: RevenueBase Database · checked Sep 16, 2026
4	AMD Group	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	82 contacts →
	Indirect evidence “AMD Environmental are a collaborative Mechanical and Electrical Design and Build Engineering specialist with a sustainable approach in delivering challenging and bespoke projects…” Source: RevenueBase Database · checked Sep 16, 2026
5	3mse LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	74 contacts →
	Strong evidence “3MSe Ltd are an experienced provider of turnkey Building Management Systems.” Source: RevenueBase Database · checked Sep 16, 2026
6	GEM Environmental Building Services LTD	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	59 contacts →
	Indirect evidence “GEM Environmental Building Services LTD was founded 20 years ago originally based in East London.” Source: RevenueBase Database · checked Sep 16, 2026
7	Redworx MEP Limited	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	37 contacts →
	Partial evidence “About Us: Established in 2023, Redworx MEP Limited is a dynamic Mechanical and Electrical contractor aiming to make a significant impact in the London market.” Source: RevenueBase Database · checked Sep 16, 2026
8	ECS Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	35 contacts →
	Partial evidence “Here at ECS Systems we pride ourselves on providing the highest level of personalised service, to every client.” Source: RevenueBase Database · checked Sep 16, 2026
9	Okto Technologies	Partial evidence	London, United KingdomHQ checked Sep 16, 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 16, 2026
10	ALL BMS Systems LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	27 contacts →
	Strong 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 16, 2026
11	Niblock Electrical Services	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	22 contacts →
	Partial evidence “Niblock Electrical Services are a M&E contractor based in South East London.” Source: RevenueBase Database · checked Sep 16, 2026
12	QQ Solutions LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	20 contacts →
	Strong evidence “QQ design, supply and install of residental and commercial automation technology and energy-efficient control systems.” Source: RevenueBase Database · checked Sep 16, 2026
13	Matrica	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	17 contacts →
	Strong evidence “We provide energy consultancy, data management, energy demand management and general forecasting systems for the power, gas and renewable sectors.” Source: RevenueBase Database · checked Sep 16, 2026
14	Siemsatec LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	17 contacts →
	Strong evidence “Established in 2004, Siemsatec Ltd are an independent building management systems (BMS) and energy management specialists.” Source: RevenueBase Database · checked Sep 16, 2026
15	Accurro LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	14 contacts →
	Strong evidence “Founded in 2002, Accurro was originally set up to be a commercial building management systems controls company.” Source: RevenueBase Database · checked Sep 16, 2026
16	BTP Consultants	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	12 contacts →
	Strong evidence “We design mechanical and electrical systems, advise on all aspects of energy, carbon reduction and building physics.” Source: RevenueBase Database · checked Sep 16, 2026
17	Automatry	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	11 contacts →
	Indirect evidence “Automatry combines building controls engineering with software development for the built environment.” Source: RevenueBase Database · checked Sep 16, 2026
18	MSI Works	Indirect evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	10 contacts →
	Indirect evidence “Unlock the Full Potential of Your Building with MSI Works!” Source: RevenueBase Database · checked Sep 16, 2026
19	Twenty ONE Engineering	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	10 contacts →
	Partial evidence “We offer a world leading Energy and Engineering support to our clients.” Source: RevenueBase Database · checked Sep 16, 2026
20	Advanced Integration LTD	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	10 contacts →
	Strong evidence “Advanced Integration (AI) is a smart home automation and building management systems (BMS) specialist with more than 30 years of experience in the industry.” Source: RevenueBase Database · checked Sep 16, 2026
21	Intrelec LTD	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	9 contacts →
	Partial evidence “Intrelec are NICEIC Approved Mechanical & Electrical Contractors in London providing M&E design, installation and maintenance services to commercial, industrial and residential…” Source: RevenueBase Database · checked Sep 16, 2026
22	JSJ Smart Homes	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	1-10	9 contacts →
	Partial evidence “JSJ Smart Homes was formed as a specialised contractor in the field of domestic installations, covering all aspects of electrical installs, such as home automation and data…” Source: RevenueBase Database · checked Sep 16, 2026
23	Tyford	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	8 contacts →
	Partial evidence “Tyford is an M&E contractor with over 20 years experience.” Source: RevenueBase Database · checked Sep 16, 2026
24	Cilantro Facilities Management	Strong evidence	London, United KingdomHQ checked Sep 16, 2026	51-200	7 contacts →
	Strong evidence “Cilantro Facilities Management ethos is to successfully and proactively manage mechanical, electrical services and energy centres across each of our blue chip clients’…” Source: RevenueBase Database · checked Sep 16, 2026
25	IBOS	Partial evidence	London, United KingdomHQ checked Sep 16, 2026	11-50	7 contacts →
	Partial evidence “IBOS optimises building systems, transforming them into intelligent, highly efficient operations.” Source: RevenueBase Database · checked Sep 16, 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: energy management 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 energy management system contractors.
Partial evidence: Its own public description names part of energy management system contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name energy management 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 140 energy management system contractors based in London, United Kingdom

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Energy management system contractors based in London, United Kingdom at a glance

As of Sep 16, 2026

51.7%Verified-email coverage

17.1Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

5,001-10,000

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 140 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 energy management 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 “energy management 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 energy management 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 energy management 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, 1,233 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 16, 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.

Energy management system contractors by metro in the United Kingdom

Energy management system contractors in London140
Energy management system contractors in Manchester33
Energy management system contractors in Bristol30

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 energy management 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 energy management system contractors are there based in London, United Kingdom?

RevenueBase identified 140 energy management 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?

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

Which city has the most energy management system contractors?

London leads with 140 headquartered companies, followed by Manchester (33) and Bristol (30).

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 1,233 verified decision-maker contacts tracked across these 140 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 16, 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.