Company lists · Data verified August 2026

Top 25 List building services based in the United Kingdom

Name: List building services based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 3,609 companies tracked

There are 3,609 list building services headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 18,251 professional contacts across them, including 5,315 with verified work emails and 1,077 with mobile numbers. London is the largest hub.

This list covers list building services headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

3,609Companies

18,251Contacts tracked

5,315Verified emails

1,077Mobile numbers

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The 25 largest list building services based in the United Kingdom

Ranked by team size

Top 25 of 3,609 list building services based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	FES Group	Aberdeen	501-1,000	659	104
2	JCA Engineering	Stevenage	201-500	236	160
	RevenueBasePublisher of this directory	Boston, MA	n/a	n/a	Try free
3	Knight Harwood	London	51-200	145	119
4	ANDEC	Newport Pagnell	501-1,000	108	20
5	JKR Contractors LTD	Aberdeen	51-200	95	15
6	UMC Architects	Manchester	51-200	83	67
7	Westgreen Construction	London	51-200	70	50
8	Combined Facilities Management CFM LTD	Castledawson Castledawson Castledawson	201-500	70	46
9	Formation Architects	London	51-200	67	43
10	Carmel Group UK	Epsom	201-500	48	8
11	Cocksedge Building Contractors Limited	Postwick	51-200	46	28
12	Knight Build Limited	Billericay	51-200	46	21
13	KEY Property Solutions LTD	Belper	51-200	44	28
14	Brymor Group Southern LTD	Denmead	51-200	43	6
15	Mascott Construction	Belfast	51-200	33	16
16	Concept Bespoke	London	51-200	33	14
17	The DE Group UK LTD	London	201-500	32	15
18	Seville Developments	Oxford	51-200	30	12
19	FSH Group	Obq	51-200	30	7
20	Buzzoni S.R.L	City Of London	51-200	29	22
21	The Hacs Group	Harrogate	51-200	28	19
22	Ernest Park LTD	London	51-200	27	19
23	Fleming	Glasgow	51-200	27	12
24	ADI Building & Refurbishment LTD	Birmingham	51-200	26	12
25	Deep Group London	Uxbridge Harefield	51-200	25	1

Showing 25 of 3,609 list building services based in the United Kingdom

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List building services based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 737 HQs

1,077Contacts with mobile numbers

51Emails re-verified in last 30 days

Companies by employee count

1-10

2,215

11-50

995

51-200

154

201-500

501-1,000

1,001-5,000

10001+

List building services by metro

Metro	Companies
List building services in London	737
List building services in Manchester	64
List building services in Birmingham	41
List building services in Bristol	39
List building services in Leeds	34
List building services in Nottingham	32
List building services in Glasgow	28

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “list building services”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 51 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many list building services are there based in the United Kingdom?

There are 3,609 list building services headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

FES Group, headquartered in Aberdeen, tops this list with the largest team on record.

Which city has the most list building services?

London leads with 737 headquartered companies, followed by Manchester (64) and Birmingham (41).

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 5,315 verified decision-maker contacts tracked across these 3,609 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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Related lists

List building services by geography

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.