Company lists · Data verified August 2026

Top 15 Custom web development agencies based in the United Kingdom

Name: Custom web development agencies 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 8,094 companies tracked

There are 8,094 custom web development agencies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 38,573 professional contacts across them, including 6,049 with verified work emails and 2,732 with mobile numbers. London is the largest hub.

This list covers custom web development agencies 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.

8,094Companies

38,573Contacts tracked

6,049Verified emails

2,732Mobile numbers

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The 15 largest custom web development agencies based in the United Kingdom

Ranked by team size

Top 15 of 8,094 custom web development agencies 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	Elsner Technologies Pvt. LTD	Hornchurch	201-500	510	40
2	Spindogs	Cardiff	51-200	61	13
3	Cmolds	Pendlebury Manchester	501-1,000	55	12
4	Zengenti	Cleedownton Ludlow	51-200	46	38
5	Nettl HQ	Manchester	201-500	38	17
6	Htlogics	Ewell	51-200	37	6
7	RVS Media LTD	London	51-200	36	1
8	Interactive Technology Corporation ITC UK	Manchester	51-200	25	22
9	Origincore Consulting LLP Origincoretech.com	London	1,001-5,000	25	1
10	Techcinity	Manchester	51-200	20	5
11	Hostbax	Walsall	51-200	12	1
12	I10studios	London	51-200	8	1
13	Penta Software & Creative UK	London	51-200	4	3
14	Webiniserltd	London	51-200	3	1
15	search-creative.co.uk	Ferndown	51-200	2	2

Showing 15 of 8,094 custom web development agencies based in the United Kingdom

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Custom web development agencies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 2037 HQs

2,732Contacts with mobile numbers

17Emails re-verified in last 30 days

Companies by employee count

1-10

6,425

11-50

1,309

51-200

168

201-500

501-1,000

1,001-5,000

10001+

Custom web development agencies by metro

Metro	Companies
Custom web development agencies in London	2037
Custom web development agencies in Manchester	237
Custom web development agencies in Birmingham	149
Custom web development agencies in Glasgow	123
Custom web development agencies in Leeds	120
Custom web development agencies in Bristol	112
Custom web development agencies in Edinburgh	88

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 “custom web development agencies”, 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; 17 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 custom web development agencies are there based in the United Kingdom?

There are 8,094 custom web development agencies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Elsner Technologies Pvt. LTD, headquartered in Hornchurch, tops this list with the largest team on record.

Which city has the most custom web development agencies?

London leads with 2037 headquartered companies, followed by Manchester (237) and Birmingham (149).

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 6,049 verified decision-maker contacts tracked across these 8,094 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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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.