The short version: most small businesses spend somewhere between £29 and £300 a month on the software itself, then another £500 to £3,000 as a one-off to build the sequences. The software is never the expensive part. The thinking, writing and strategy behind it is, and that's the bit almost nobody budgets for.
What you're really paying for
When people ask "how much does email automation cost," they usually mean the monthly software fee. Fair enough, that's the visible number. But email automation has three separate costs that get lumped together, and confusing them is why so many businesses end up paying £150 a month for a tool that sits there half-used:
- The platform itself (ActiveCampaign, Klaviyo, HubSpot, Mailchimp, Kit)
- The setup: someone has to write the welcome sequence, map the triggers, and decide who gets what email and when
- The ongoing maintenance: testing, fixing broken flows, updating copy when your offer changes
Skip the second and third and you've bought a very expensive filing cabinet. I've seen it more times than I can count.
Software costs by list size (real numbers)
Prices scale with the number of contacts, not the number of automations you build, which catches people out constantly. Here's roughly what you'll pay in 2026:
- Mailchimp: free up to 500 contacts with basic automation; Standard plan around £20/month at 500 contacts, rising to £280 to £350/month at 10,000 contacts once you want branching automation
- ActiveCampaign: Lite starts around £29/month for 1,000 contacts but doesn't include the split-path automation most people need; Plus (with proper conditional logic and a light CRM) starts around £49/month, Professional around £149/month
- Klaviyo: free to 250 contacts, then around £35 to £45/month at 1,000 to 1,500 contacts, scaling past £700/month once you're over 50,000, common for ecommerce brands running abandoned cart and post-purchase flows
- Kit (formerly ConvertKit): free to 1,000 subscribers with limited automation, paid tiers from around £9/month, automation features unlocked from around £25/month at 1,000 subscribers
- HubSpot: Marketing Hub Starter from around £15/month per seat but capped functionality; Professional, where automation gets useful, starts around £700 to £900/month, which is why most solo businesses and small teams shouldn't touch it yet
Notice the pattern: the jump from "has automation" to "has automation that's flexible" is where the price roughly doubles or triples on every platform. That's a deliberate pricing tier, not an accident.
Setup costs: DIY, freelancer, or agency
This is the part almost every article on this topic skips, and it's the number that determines your total spend.
- DIY: free in cash, but budget 15 to 25 hours to build a proper welcome sequence, one nurture flow, and basic segmentation, assuming you already know what you want to say
- Freelancer: £500 to £1,800 for a full setup, five to seven emails, tagging logic, and testing. Rates I've seen quoted by working freelancers in the UK sit around £45 to £85 an hour, or fixed project fees
- Agency retainer: £1,200 to £5,000 a month for ongoing build, optimisation and reporting, usually only worth it once your list is over 5,000 and email is a real revenue channel, not a nice-to-have
If you're weighing up whether to hire outside help at all, it's worth reading what an AI consultant typically costs before you commit, because a lot of the automation logic (segmentation, predictive send times, subject line testing) now sits inside AI features rather than pure email tools, and the pricing conversation is starting to blur between the two.
A real example from a client project
A course creator I worked with was paying £99 a month for ActiveCampaign's Plus plan. Good platform, right features. But when I looked at her account, there was one automation live: a single "thanks for subscribing" email. No welcome series, no cart abandonment flow, nothing tagging people by interest. She'd been paying for eight months. That's £792 spent on software with almost nothing running through it.
We spent four hours together mapping out a proper welcome sequence, a re-engagement flow for cold subscribers, and tagging based on which lead magnet people downloaded. Within six weeks her open rates on the automated emails were sitting around 38%, against roughly 19% on her old manual broadcasts. The software hadn't changed. The £99 a month hadn't changed. What changed was that someone finally used it.
The hidden costs nobody mentions
Beyond the platform and the build, there are a few costs that quietly add up:
- List growth: automation is only as good as the list feeding it, and building that list from scratch has its own cost, which I've broken down in this piece on what it really costs to build an email list
- Deliverability: a dedicated sending domain, warm-up period, and occasional consultant time if your emails start landing in spam, easily £200 to £500 if you need someone to fix it
- Copywriting refreshes: automations go stale. An offer changes, a price goes up, and nobody updates the sequence for a year. Budget for a quarterly review, either your own time or £150 to £400 for a freelancer to audit and rewrite
- Integration costs: connecting your email tool to your CRM, ecommerce platform, or booking system sometimes needs Zapier or Make, which adds £15 to £50 a month on top
The uncomfortable bit
Here's what most guides on this topic won't tell you straight: the monthly software fee is almost never the reason automation fails to pay for itself. It's that most people buy the top-tier plan for the automation features, then never build past the single welcome email, exactly like my client above. You end up paying for capacity, not usage. If you're not going to invest the hours (or the money to pay someone else to invest the hours) in writing the actual sequence logic, a £20 a month plan with one good automation will outperform a £150 a month plan with none. Buy for what you'll build, not what you might build one day.
Want AI doing the heavy lifting in your marketing?
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And if email marketing as a whole still feels like an unclear cost to you, it's worth reading this breakdown of what email marketing costs to run month to month, because automation is only one line in that budget.
How to keep costs down without cutting corners
- Start on a mid-tier plan (ActiveCampaign Plus or Klaviyo's first paid tier), not the cheapest one, because entry tiers often strip out branching logic you'll need within a month
- Build one automation before adding a second. A single welcome sequence done well beats five half-finished ones
- Pair email automation with social media automation so the two channels reinforce each other instead of running as separate projects with separate costs
- If you're hiring, ask for a fixed-fee setup rather than an hourly rate, so you know the total before you start
- Review performance every quarter rather than paying for a monthly agency retainer you don't yet need
If you're not confident writing the sequence logic yourself, it might be worth understanding what an email marketing specialist does day to day, because that's often a cheaper hire than a full agency and gets the setup done the first time.
Related: working with an ai consultant ecommerce brands where hours go.
Frequently asked questions
Is email automation worth paying for if I have a small list?
Yes, even under 1,000 subscribers, because the welcome sequence and basic tagging pay for themselves quickly and most platforms (Kit, Mailchimp, Klaviyo) offer free or near-free plans at that size. The cost only becomes a real decision once you're past 1,000 to 2,000 contacts and considering paid tiers.
What's the cheapest way to get started with email automation?
Use a free tier (Mailchimp, Kit or Klaviyo all offer one under a certain contact count), build a single three-email welcome sequence yourself, and only upgrade once you've proven that sequence works. Spending on a bigger plan before you've built anything is the most common way people waste money on this.
Should I hire a freelancer or an agency for email automation?
A freelancer at £500 to £1,800 makes sense for a one-off build of your core sequences. An agency retainer of £1,200 or more a month only makes sense once email is a proven revenue channel and you need ongoing optimisation, not just a setup.
Why do email automation costs jump so much between plan tiers?
Because the pricing tiers are built around when businesses need conditional logic and multi-step branching, not just contact volume. Platforms deliberately gate the useful automation features behind their second or third tier, which is why the jump from entry-level to mid-tier often doubles the price.
