Warming up
Transactional email API
1,635 web design agencies in the UK publish an email address on their own website, as of September 29, 2026. WordPress runs on 73% of their websites, and 13% name London on their website, more than any other UK city.
Searching is free. You only spend allowance when you export.
Counted by the city each company's own website names. London leads with 219; a company that names two cities counts in both.
| London | 219 (13%) |
|---|---|
| Manchester | 41 (3%) |
| Glasgow | 28 (2%) |
| Birmingham | 26 (2%) |
| Leeds | 26 (2%) |
| Newcastle | 23 (1%) |
| Sheffield | 22 (1%) |
| Belfast | 21 (1%) |
| Nottingham | 18 (1%) |
| Liverpool | 15 (under 1%) |
Of the 367 that print a Companies House number, 98% are registered in England and Wales, 2% are registered in Scotland and under 1% are registered in Northern Ireland.
Every company here publishes an email address. These are the other routes and signals their websites carry.
A second route for when email goes unanswered.
Growing firms buy more. A useful first filter.
Who hosts their email decides which spam filter reads your message. What their site is built on says what else they already pay for.
| Google Workspace | 509 (31%) |
|---|---|
| Microsoft 365 | 266 (16%) |
| Self-hosted | 215 (13%) |
| IONOS | 50 (3%) |
| Other or unknown | 595 (36%) |
Read from each domain's public MX record. If most of your list is on one provider, warm up a mailbox on that provider first. Filter by provider in the lead finder.
Share of these companies whose homepage loads each technology. Google Analytics is left out because nearly everyone runs it.
308 of them (19%) state a founding year on their site. This is how those split.
| Before 1980 | 7 (2%) |
|---|---|
| 1980 to 1999 | 44 (14%) |
| 2000 to 2009 | 99 (32%) |
| 2010 to 2014 | 95 (31%) |
| 2015 to 2019 | 44 (14%) |
| 2020 or later | 19 (6%) |
What we have learned about emailing web design agencies. The numbers above tell you how many there are; this is how to get a reply.
Studios live on referrals and hate being sold to, but they are always short on either leads or delivery time. Lead with one of those two, and prove it with something specific to a site they built.
Hi [first name], came across the site you built for [client]. Really clean work. Quick question: when a client asks you for ongoing marketing after launch, do you do it or refer it out? We help studios keep that revenue.
Replace the bracketed parts per company. In a Warmerly campaign they fill from the lead's own fields.
Late morning, midweek. Designers protect early mornings for focused work and answer email after their first block.
Warmerly's lead database holds 1,635 web design agencies in the UK that publish an email address on their own website, counted on September 29, 2026. That is not every such business in the country. It is the ones whose site we crawled and that list a way to contact them by email, which is the number that matters for outreach.
Google Workspace runs email for 31% of them, followed by Microsoft 365 at 16%. It is read from each domain's public MX records. It matters for cold email because Google and Microsoft filter differently, so a sending mailbox on the same provider as most of your list is worth warming up first.
London, named by 219 of them, then Manchester (41) and Glasgow (28). The count is companies whose website names the city, so one business can appear under more than one.
Yes. Searching the database in Warmerly is free, and you see the same count as this page before spending anything. Exporting or adding companies to a campaign uses your plan's monthly lead allowance. Every result is a business contact route the company publishes itself, and any company that has asked to be removed is excluded. This page shows totals only, never individual companies.
Filter them by size, founding year, technology and hiring, see what each record holds, then send from warmed-up mailboxes in the same tool.
