Company lists · Data refreshed September 2026

Top 25 Custom web development agencies based in London, United Kingdom

Name: Custom web development agencies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 9, 2026 1,406 companies tracked

RevenueBase identified 1,406 custom web development agencies headquartered in London, United Kingdom as of September 2026 and tracks 12,416 professional contacts across them, including 711 with verified work emails and 673 with mobile numbers. London is the largest hub.

This list covers custom web development agencies 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 9, 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 9, 2026 86% judged on-target in blind review

1,406Companies

12,416Contacts tracked

711Verified emails

673Mobile numbers

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The 25 largest custom web development agencies based in London, United Kingdom

Ranked by team size

Top 25 of 1,406 custom web development agencies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 9, 2026. RevenueBase Smart Search rates how each company's information relates to custom web development agencies: 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	Turn UP Technologies	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	74 contacts →
	Indirect evidence “Turn Up Technologies is a digital growth IT firm headquartered in London, UK with offices across the Texas, UAE, Canada, and Pakistan.” Source: RevenueBase Database · checked Sep 9, 2026
2	Filter	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	50 contacts →
	Indirect evidence “Your expert WordPress agency partner for performance and personalisation.” Source: RevenueBase Database · checked Sep 9, 2026
3	FAT Beehive	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	47 contacts →
	Partial evidence “Fat Beehive is a specialist charity web design agency that builds beautiful Drupal and Wordpress websites for NGOs, social enterprises and other non-profits.” Source: RevenueBase Database · checked Sep 9, 2026
4	KD WEB	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	44 contacts →
	Partial evidence “KD Web is an award winning internet marketing, web design and creative agency, providing SEO, polished website design, Ecommerce and CMS systems as well as branding and graphic…” Source: RevenueBase Database · checked Sep 9, 2026
5	QTECH	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	43 contacts →
	Indirect evidence “Over 25 years of experience; over projects delivered and clients in 10 different countries.” Source: RevenueBase Database · checked Sep 9, 2026
6	A2z Creatorz Trusted Digital Partner	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	39 contacts →
	Strong evidence “A2Z Creatorz is one of the Leading Web Services Provider in the world, services includes, Website Designing, Development, Online Applications, Portal…” Source: RevenueBase Database · checked Sep 9, 2026
7	BIG Blue Door	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	35 contacts →
	Strong evidence “Big Blue Door is a web & digital development and hosting agency with substantial experience in designing, developing and maintaining high quality, high impact, open source…” Source: RevenueBase Database · checked Sep 9, 2026
8	Gnomen LTD	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	33 contacts →
	Partial evidence “was founded by a team of web designers and online software developers in 2001, as a partnership between great design and powerful database-driven systems.” Source: RevenueBase Database · checked Sep 9, 2026
9	Incode Systems Web, Mobile & AI Product Development	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	28 contacts →
	Partial evidence “We are a software development company that designs, develops, and deploys software solutions for organizations across industries.” Source: RevenueBase Database · checked Sep 9, 2026
10	KOTA	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	27 contacts →
	Indirect evidence “We’re a team of talented creatives who live and breathe great design.” Source: RevenueBase Database · checked Sep 9, 2026
11	Ninos Global Tech	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	27 contacts →
	Indirect evidence “At Ninos Global Technology, we are passionate about empowering businesses and individuals with cutting-edge digital solutions.” Source: RevenueBase Database · checked Sep 9, 2026
12	Yellowball	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	26 contacts →
	Indirect evidence “We’re a hand-picked global team of exceptional designers, engineers, SEO experts and paid media specialists, crafting websites and digital experience that work as hard as you do.” Source: RevenueBase Database · checked Sep 9, 2026
13	Pixel Point LTD	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	26 contacts →
	Partial evidence “Meet the Pixel Point creative web agency!” Source: RevenueBase Database · checked Sep 9, 2026
14	WP Minds	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	23 contacts →
	Partial evidence “WP Minds is a WordPress design, development, maintenance and SEO agency helping coaches, consultants and other service professionals grow with high performing WordPress websites…” Source: RevenueBase Database · checked Sep 9, 2026
15	KITTY	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	22 contacts →
	Indirect evidence “B Corp Certified.” Source: RevenueBase Database · checked Sep 9, 2026
16	Techcurl Media Solutions	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	21 contacts →
	Strong evidence “Techcurl is a leading agile development company specialising in Web and mobile development helping businesses deliver projects on time and budget.” Source: RevenueBase Database · checked Sep 9, 2026
17	Infovinity Systems Pvt. Limited	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	51-200	21 contacts →
	Partial evidence “Infovinity Systems offers the e-commerce development solutions that will act as the link between your internet business and world."Clever Technology can be easy to use, Really…” Source: RevenueBase Database · checked Sep 9, 2026
18	Devsstream Limited	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	20 contacts →
	Partial evidence “DevsStream provides software development solutions and services all over the world.” Source: RevenueBase Database · checked Sep 9, 2026
19	Webermelon	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	19 contacts →
	Partial evidence “Webermelon is a website & software development company for your SaaS, PaaS and WordPress websites.” Source: RevenueBase Database · checked Sep 9, 2026
20	UMI Digital	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	18 contacts →
	Partial evidence “Award-winning designs, backed up with beautiful bespoke code to create future proof and lightening-fast website and web app experiences.” Source: RevenueBase Database · checked Sep 9, 2026
21	Onexcell	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	1-10	18 contacts →
	Partial evidence “Onexcell is a digital solutions agency crafting immersive experiences that shape the future.Our legacy is built on quality, innovation, and customer satisfaction.” Source: RevenueBase Database · checked Sep 9, 2026
22	Softexpoit	Strong evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	18 contacts →
	Strong evidence “Softexpoit's team of experts combines technical expertise and creativity to develop custom software, mobile app, and web app solutions that meet your specific business/official…” Source: RevenueBase Database · checked Sep 9, 2026
23	Vsourz	Indirect evidence	London, United KingdomHQ checked Sep 9, 2026	201-500	17 contacts →
	Indirect evidence “Vsourz is an international technology partner helping organisations turn digital ambition into production-ready outcomes.” Source: RevenueBase Database · checked Sep 9, 2026
24	Elementary Digital	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	17 contacts →
	Partial evidence “We are a WordPress and e-commerce agency specialising in strategy, design and development for mid-market and enterprise organisations.” Source: RevenueBase Database · checked Sep 9, 2026
25	Lilo WEB Design	Partial evidence	London, United KingdomHQ checked Sep 9, 2026	11-50	17 contacts →
	Partial evidence “Lilo is an award winning web design agency delivering expert and cost effective solutions.” Source: RevenueBase Database · checked Sep 9, 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: custom web development agencies. 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 custom web development agencies.
Partial evidence: Its own public description names part of custom web development agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom web development agencies. 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 1,406 custom web development agencies based in London, United Kingdom

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Custom web development agencies based in London, United Kingdom at a glance

As of Sep 9, 2026

5.7%Verified-email coverage

5.4%Mobile-number coverage

8.8Average contacts per company

1-10Median size (employees)

144.9%Largest-city concentration · London

Sep 9, 2026Page data refreshed

Companies by employee count

1-10

994

11-50

345

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 12.0d

6450–30

6031–60

161–90

090–180

5180+

Company record updated

Median 67.0d

00–30

4,90931–60

6,00161–90

1,10690–180

400180+

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 custom web development agencies, 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 “custom web development agencies”. 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 custom web development agencies), 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 custom web development agencies, 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, 711 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 9, 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.

Custom web development agencies by metro in the United Kingdom

Custom web development agencies in London2037
Custom web development agencies in Manchester237
Custom web development agencies in Birmingham149
Custom web development agencies in Glasgow123
Custom web development agencies in Leeds120
Custom web development agencies in Bristol112
Custom web development agencies in Edinburgh88

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 custom web development agencies, 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 custom web development agencies are there based in London, United Kingdom?

RevenueBase identified 1,406 custom web development agencies 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?

Turn UP Technologies, headquartered in London, 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 711 verified decision-maker contacts tracked across these 1,406 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 9, 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.