Klaviyo is the dominant email marketing platform for ecommerce. If you are running a Shopify store doing £250,000 or more in annual revenue, there is a very good chance you are already on Klaviyo or considering it. The platform is powerful, the Shopify integration is deep, and the potential revenue impact is significant.
The question most brands face is not whether to use Klaviyo, but whether to manage it themselves or pay someone else to do it. This guide covers exactly what managed Klaviyo services include, what they should cost in the UK market, and how to evaluate whether you are getting genuine value.
We run Klaviyo management for ecommerce brands across multiple verticals. This guide is informed by that experience, but it is written to be useful regardless of whether you work with us, another agency, or manage Klaviyo in-house.
What "managed Klaviyo" actually means
The term "managed Klaviyo services" covers a wide range of scope and depth. At one end, it means someone sending your email campaigns for you. At the other, it means a comprehensive email marketing function that handles strategy, execution, optimisation, and reporting.
The distinction matters because pricing and value vary enormously depending on what is actually included. A service that sends four templated campaigns per month is fundamentally different from one that manages your entire email revenue channel.
The three tiers of managed Klaviyo
In our experience, managed Klaviyo services in the UK market fall into three broad tiers:
- Tier 1: Campaign execution. The agency sends your campaigns. You provide the brief, they build and send the emails. Flows are set up once and left alone. Reporting is basic. This is the most common (and cheapest) tier, but it delivers the least value because there is minimal strategic input.
- Tier 2: Campaign + flow management. The agency manages both campaigns and automated flows. They actively optimise flows, test subject lines, and refine segmentation. Reporting is more detailed and includes revenue attribution. This is the sweet spot for most brands in the £500k-£2M revenue range.
- Tier 3: Full email strategy. The agency acts as your email marketing department. They develop the content calendar, create the strategy, manage flows and campaigns, run A/B tests, handle list growth initiatives, monitor deliverability, and provide detailed monthly reporting with strategic recommendations. This tier is appropriate for brands doing £2M+ where email represents a significant revenue channel.
What a managed service should include
Regardless of which tier you choose, here is what a competent managed Klaviyo service should deliver.
Flow architecture and optimisation
Automated flows are where the majority of email revenue comes from. A well-structured Klaviyo account should have, at minimum, these core flows:
- Welcome series (3-5 emails for new subscribers)
- Abandoned cart (2-3 emails triggered by cart abandonment)
- Abandoned checkout (separate from cart abandonment, triggered later in the funnel)
- Browse abandonment (triggered when someone views a product but does not add to cart)
- Post-purchase (thank you, delivery updates, review request, cross-sell)
- Win-back (re-engagement for lapsed customers)
- Sunset (removing permanently unengaged profiles to protect deliverability)
A managed service should not just set these up once. They should be actively monitoring flow performance, testing variations, and optimising trigger conditions, timing, and content. For more on flow architecture, see our guide on Klaviyo flows that recover revenue.
Campaign strategy and execution
Campaigns are the scheduled emails you send to your list — product launches, promotions, content, seasonal messaging. A managed service should include:
- Content calendar planning. A monthly calendar aligned with your commercial objectives, seasonal events, and product launches.
- Segmentation strategy. Not every email should go to your entire list. Smart segmentation improves open rates, click rates, and — critically — protects your sender reputation.
- Template design. Custom email templates that match your brand identity and are optimised for mobile rendering. Templates should be built in Klaviyo's drag-and-drop editor or coded directly, not created in external tools and imported as images.
- Copy and creative. Some services include copywriting, others expect you to provide the brief. Clarify this before signing.
- Send time optimisation. Using Klaviyo's smart send time feature and historical engagement data to determine the optimal send time for each segment.
List management and hygiene
Your email list is an asset, but only if it is healthy. A managed service should actively manage list hygiene, which includes:
- Regular suppression of hard bounces and invalid addresses
- Sunset flow management for persistently unengaged profiles
- Compliance with UK GDPR and PECR (Privacy and Electronic Communications Regulations)
- Double opt-in configuration where appropriate
- List growth strategy through pop-ups, embedded forms, and landing pages
A/B testing
Systematic testing is what separates good email marketing from great email marketing. Your managed service should be running tests on:
- Subject lines (the highest-leverage test)
- Send times
- Email content and layout
- Call-to-action placement and copy
- Offer structures (percentage discount vs fixed amount, free shipping vs percentage off)
Each test should have a hypothesis, run for a statistically significant sample, and the results should inform future decisions. If your agency is not documenting test results and applying learnings, they are not really testing — they are guessing.
Deliverability monitoring
Deliverability is the unglamorous foundation of email marketing. If your emails are not reaching the inbox, nothing else matters. A managed service should monitor:
- Inbox placement rates
- Spam complaint rates (should be below 0.1%)
- Bounce rates
- Domain and IP reputation
- Authentication (SPF, DKIM, DMARC) configuration
Reporting and analysis
Monthly reporting should go beyond vanity metrics (opens, clicks) and focus on revenue attribution. A good report answers: how much revenue did email generate this month, what was the split between flows and campaigns, which segments performed best, and what are we changing next month based on what we learned?
What it costs: a transparent breakdown
We believe in transparency on pricing. Here is what managed Klaviyo services typically cost in the UK market, based on our experience and industry benchmarks. These are estimates and will vary by agency, scope, and list size.
| Service tier | Typical monthly cost | What is included | Best for |
|---|---|---|---|
| Tier 1: Campaign execution | £800 - £1,500/mo | 4-8 campaigns/month, basic flow monitoring, monthly report | Brands with in-house strategy who need execution capacity |
| Tier 2: Campaign + flow management | £1,500 - £3,000/mo | 8-12 campaigns/month, flow optimisation, segmentation, A/B testing, detailed reporting | Brands doing £500k-£2M wanting to grow email revenue |
| Tier 3: Full email strategy | £3,000 - £5,000+/mo | Everything in Tier 2 plus content strategy, creative direction, SMS, advanced segmentation, quarterly business reviews | Brands doing £2M+ where email is a major revenue channel |
One-off setup vs ongoing management
Some brands only need a one-off Klaviyo setup or audit, not ongoing management. A comprehensive Klaviyo setup — including flow architecture, template design, list migration, and segmentation — typically costs £3,000 to £8,000 as a one-off project. An audit of an existing Klaviyo account, with recommendations and a prioritised action plan, usually costs £1,000 to £2,500.
The one-off setup makes sense if you have internal capacity to manage ongoing campaigns and flow optimisation. If you do not, you will get the setup done but see diminishing returns over time as flows become stale and campaigns lack strategic direction.
What drives the price up
Several factors push managed Klaviyo costs higher:
- List size. Larger lists require more sophisticated segmentation, longer send times, and more careful deliverability management.
- Campaign frequency. If you want daily or near-daily campaigns, the content creation and management time increases significantly.
- SMS. If your managed service includes SMS marketing (which Klaviyo now supports natively), expect the cost to increase by 20-40%.
- Custom template design. If every campaign needs a bespoke designed template rather than using established templates, design costs add up.
- Advanced segmentation. Predictive analytics, RFM modelling, and behaviour-based segmentation require more analytical expertise.
DIY vs managed: when each makes sense
Not every brand needs managed Klaviyo services. Here is an honest assessment of when DIY makes sense and when it does not.
Manage it yourself when:
- You have someone in-house with genuine email marketing expertise (not just "someone who can use Mailchimp")
- Your list is under 10,000 profiles and your email programme is relatively straightforward
- You have the time to learn Klaviyo properly and stay current with best practices
- Your budget genuinely cannot support managed services at this stage
Use managed services when:
- Email is generating less than 20% of your revenue and you know it should be higher
- You do not have in-house email expertise and hiring a specialist is not feasible
- Your flows have not been touched since they were set up and performance is declining
- You are sending the same campaign to your entire list because you do not have time for segmentation
- You are spending time on email that could be better spent on product development, buying, or other core business functions
The decision should ultimately come down to economics. If your email channel is generating £50,000 per year and a managed service could realistically increase that to £80,000 (a 60% improvement, which is achievable for an underperforming account), then the £18,000-£36,000 annual cost of managed services generates a positive return. As we discuss in our guide to auditing agency agreements, the key is measuring whether you are getting genuine ROI from any external service.
What good Klaviyo management looks like
Here is what you should expect from a competent managed Klaviyo service, month by month.
Month 1: Audit and setup
The first month is typically focused on auditing your existing setup, identifying gaps, and implementing quick wins. This includes:
- Full account audit covering flows, segments, lists, forms, and deliverability
- Gap analysis against best-practice flow architecture
- Quick wins — the changes that will generate revenue immediately (e.g., fixing a broken abandoned cart flow, adding a browse abandonment trigger)
- Template design aligned with your brand guidelines
- Campaign calendar for the first 30-60 days
Month 2-3: Implementation and optimisation
This phase focuses on building out the full flow architecture and establishing campaign cadence. You should see measurable improvements in email revenue during this period.
Month 4+: Ongoing optimisation
Once the foundation is in place, the focus shifts to continuous optimisation: testing, refining segmentation, seasonal campaign planning, and identifying new revenue opportunities within the email channel.
Red flags in Klaviyo agencies
Not all managed Klaviyo services are created equal. Here are the warning signs that an agency is not delivering real value:
- They send every campaign to the entire list. This is the most common sign of lazy email management. It damages deliverability and indicates zero segmentation strategy.
- Their reports only show opens and clicks. If the report does not include revenue attribution, the agency either does not know how to measure it or does not want you to see the numbers.
- Flows have not been updated in months. If you are paying for flow management and the flows have not changed since they were set up, you are paying for monitoring, not management.
- No A/B testing. If the agency is not running systematic tests, they are relying on assumptions rather than data.
- They cannot explain their segmentation strategy. Ask why specific segments receive specific campaigns. If the answer is vague, the strategy is vague.
- You never hear from them proactively. A good email marketing partner brings ideas and opportunities to you. If you are always chasing them, the relationship is wrong.
For more on evaluating agencies generally, see our guide to choosing the right agency.
Measuring the ROI
The beauty of email marketing is that it is one of the most measurable channels in ecommerce. Here is how to evaluate whether your managed Klaviyo service is delivering a return.
Revenue attribution
Klaviyo tracks revenue attribution natively. The default attribution window is 5 days for opens and 5 days for clicks. This means if a customer opens or clicks an email and then makes a purchase within that window, the revenue is attributed to email.
Some agencies manipulate attribution windows to inflate their numbers. A 30-day click attribution window will capture revenue that was likely driven by other channels. In our experience, the standard 5-day/5-day window provides the most honest representation of email's contribution.
Key benchmarks
Based on our experience managing Klaviyo for UK ecommerce brands, here are the benchmarks a well-managed account should achieve:
| Metric | Good | Excellent |
|---|---|---|
| Email as % of total revenue | 25-30% | 30-40% |
| Flow revenue as % of email revenue | 50-60% | 55-65% |
| Average open rate (campaigns) | 35-45% | 45-55% |
| Average click rate (campaigns) | 2-4% | 4-6% |
| Placed order rate (flows) | 3-5% | 5-8% |
| Spam complaint rate | <0.1% | <0.05% |
| Unsubscribe rate (campaigns) | <0.3% | <0.15% |
Note: open rates have become less reliable since Apple's Mail Privacy Protection was introduced, which pre-loads email tracking pixels. Focus on click rates and revenue as your primary performance indicators.
The cost-per-revenue calculation
The simplest way to evaluate ROI is to calculate your cost per pound of email revenue. If your managed Klaviyo service costs £2,000 per month and generates £30,000 in attributed revenue, your cost-per-revenue ratio is 6.7%. In our experience, a well-managed Klaviyo service should deliver email revenue at a cost ratio of 5-10%. If the ratio exceeds 15%, either the service is overpriced or the account is underperforming.
Email marketing should be your most profitable acquisition and retention channel. If it is not generating at least 25% of your total revenue, the opportunity cost of not optimising it properly is significant.
Andrew Simpson, Founder
Getting started
If you are considering managed Klaviyo services, here is what to do next.
1. Audit your current performance
Before engaging any agency, understand your current email performance. Log into Klaviyo, go to Analytics, and note: what percentage of revenue is attributed to email, what is the split between flows and campaigns, what is your average open rate and click rate, and which flows are generating the most revenue. This gives you a baseline to measure improvement against.
2. Define your expectations
Be clear about what you need. Do you need campaign execution only, or full strategic management? How many campaigns per month do you expect? Do you need custom template design, or can the agency use your existing templates? Do you want SMS included?
3. Ask the right questions
When evaluating Klaviyo agencies, ask: what is your approach to segmentation? How do you measure success? Can you share anonymised results from similar brands? What does your onboarding process look like? How often will we communicate? What happens if we want to bring email management in-house later? See our guide to negotiating exit from agency contracts for more on this last point.
4. Start with an audit
If you are not ready to commit to ongoing management, start with a paid audit. A good Klaviyo audit will identify the biggest opportunities in your account and give you a prioritised action plan. You can then decide whether to implement the recommendations yourself or engage the agency for ongoing management. See how we approach ongoing Klaviyo flow optimisation to understand the iterative nature of this work.
Managed Klaviyo services can be one of the highest-ROI investments an ecommerce brand makes, but only if the service is comprehensive, the agency is competent, and the scope matches your actual needs. Do not overpay for campaign execution when you need strategic management, and do not underpay for a service that leaves the most valuable aspects of email marketing untouched.
If you want an honest assessment of your current Klaviyo performance and what managed services could realistically deliver for your brand, start a conversation with us. We will tell you whether it is worth it — and if it is not, we will tell you that too.
