Company lists · Data verified August 2026

Top 25 List building services based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 737 companies tracked

There are 737 list building services headquartered in London, United Kingdom (RevenueBase, August 2026). RevenueBase tracks 3,986 professional contacts across them, including 1,105 with verified work emails and 175 with mobile numbers. London is the largest hub.

This list covers list building services headquartered in London, 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.

737Companies

3,986Contacts tracked

1,105Verified emails

175Mobile numbers

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The 25 largest list building services based in London, United Kingdom

Ranked by team size

Top 25 of 737 list building services based in London, 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	Knight Harwood	London	51-200	145	119
2	Echo Architecture	London	51-200	117	48
	RevenueBasePublisher of this directory	Boston, MA	n/a	n/a	Try free
3	Odgroup	London	51-200	100	66
4	ANT Yapi UK Limited	London	51-200	73	28
5	Westgreen Construction	London	51-200	70	50
6	Formation Architects	London	51-200	67	43
7	Concept Bespoke	London	51-200	33	14
8	The DE Group UK LTD	London	201-500	32	15
9	Virtus	London	11-50	31	17
10	Ernest Park LTD	London	51-200	27	19
11	HALE	London	11-50	26	20
12	B R Architects	London	11-50	20	17
13	Komfort Services	London	201-500	19	10
14	GD Construction St.Albans LTD	London	51-200	17	15
15	Archer Humphryes Architects	London	11-50	15	11
16	Vincent & Partners	London	11-50	14	6
17	Aztec Construction	London	11-50	14	5
18	TLA Studio	London	11-50	12	6
19	Lamberti Construction	London	11-50	11	3
20	Ashville Construction	London	51-200	10	2
21	ATP Architects & Building Surveyors	London	11-50	9	7
22	Peregrine Bryant Architects	London	11-50	9	7
23	Savoy Construction	London	51-200	9	6
24	PDL Construction & Developments	London	11-50	9	3
25	Fittra LTD	London	51-200	7	3

Showing 25 of 737 list building services based in London, United Kingdom

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List building services based in London, United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 737 HQs

175Contacts with mobile numbers

11Emails re-verified in last 30 days

Companies by employee count

1-10

449

11-50

209

51-200

201-500

501-1,000

1,001-5,000

List building services by metro in the United Kingdom

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 London, 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; 11 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 London, United Kingdom?

There are 737 list building services headquartered in London, United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Knight Harwood, headquartered in London, 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 1,105 verified decision-maker contacts tracked across these 737 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

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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.