Klaviyo
The Klaviyo agency for ambitious UK ecommerce brands.
Every part of Klaviyo, set up by specialists and working together
Klaviyo audit
Every engagement starts with a full Klaviyo audit: data and integrations, sign-up forms, flows, campaigns, segments, templates, deliverability and reporting. You get a clear picture of what each part is earning, what is missing and where the biggest revenue opportunities are, then a prioritised plan to fix it in the right order.
An AI agent inside every Klaviyo account we run
Every account we run comes with an agent from our agentic marketing system that reads your Klaviyo data around the clock. Ask which flows are underperforming, who is drifting away or what to send next week, and get a clear answer backed by live numbers.
It builds segments, drafts flows and flags problems before they cost you revenue. Our Klaviyo specialists review every recommendation before anything changes in your account, so nothing goes live without a human signing it off.
Ask about your Klaviyo account
Why UK brands choose Vertical as their Klaviyo agency
Klaviyo rewards brands that use it well. We bring Gold Partner expertise, a creative team and the wider marketing view to make sure yours does, from our base in London.
Klaviyo Gold Partner agency
We are recognised by Klaviyo as a Gold Partner, with hands-on experience building and running accounts for ambitious ecommerce brands in the UK, Europe and the US.
Klaviyo experts, not generalists
Our Klaviyo consultants and specialists work in the platform every day. You get people who know the data model, the flow logic and the new features as they land, rather than an email team learning Klaviyo on your account.
Built for Shopify brands
We know how Klaviyo and Shopify work together, from catalogue feeds to custom events, so your flows and segments use the full picture of every customer.
Migrations done properly
Mailchimp to Klaviyo and other migrations are planned, staged and warmed up, so you keep your deliverability and your revenue through the switch.
Joined up with Meta ads
Klaviyo segments feed your paid audiences and exclusions, and paid insight shapes what you send, so every channel works harder together.
AI with human judgement
Agents handle analysis, testing and first drafts at speed. Our Klaviyo specialists decide what goes live and keep every message on brand.
A powerhouse in a Power Station.
Vertical is a small, senior team of strategists, creatives and performance marketers based at Battersea Power Station in London, with clients and colleagues around the world. Strategy, creative and performance come from one team, with AI built into how we plan, make and measure.
The building has stood on the Thames for the best part of a century, and for fifty years it kept London’s lights on. We like the precedent.
Klaviyo agency questions, answered
What does a Klaviyo agency do?
A Klaviyo agency sets up, manages and improves your Klaviyo account for you. At Vertical that covers strategy, Klaviyo audits, data and integrations, flow building, campaign planning, segmentation, sign-up forms, design, copywriting, testing, SMS, deliverability and reporting. Instead of piecing together freelancers or stretching an in-house marketer across too many jobs, you get a senior team of Klaviyo experts focused on growing the revenue Klaviyo generates for your business.
Are you a Klaviyo agency in the UK?
Yes. Vertical is a UK Klaviyo agency based at Battersea Power Station in London, working with ecommerce brands across the UK as well as clients in Europe and the US. Being UK based matters for things like GDPR and PECR consent rules, UK send times and seasonal calendars, and simply being available in your working hours. We run accounts for London brands and for brands anywhere in the country, with everything handled remotely or in person as you prefer.
What does it mean to be a Klaviyo Gold Partner?
Klaviyo runs a partner programme for agencies that build and manage accounts on its platform, with tiers that reflect experience and the volume of work an agency does with Klaviyo brands. As a Klaviyo Gold Partner, Vertical is recognised by Klaviyo for our work on the platform and has direct access to partner support, training and early feature information. For you, it means working with a certified Klaviyo partner agency that follows best practice in how accounts are set up and run.
Should we hire a Klaviyo consultant, a freelancer or an agency?
A Klaviyo consultant or freelancer can be a good fit for a specific project such as an audit or a single flow rebuild. A Klaviyo agency makes more sense when you need the whole programme run well over time, because it combines strategy, Klaviyo specialists, designers, copywriters and reporting in one team, with cover when someone is away. Vertical offers both: project work led by a senior Klaviyo consultant, or full management as your Klaviyo partner agency.
Can you audit our existing Klaviyo account?
Yes, and a Klaviyo audit is usually where we start. It covers your integrations and data, sign-up forms, list growth, flows, campaigns, segmentation, templates, SMS, deliverability and reporting. We look at what each part is earning, where revenue is being left on the table and what is putting your sender reputation at risk. You get a clear, prioritised plan explaining what to fix first and why, whether you then work with us or take it forward with your own team.
Which Klaviyo flows should every ecommerce brand have?
Most ecommerce brands should have a welcome series for new subscribers, browse abandonment, cart and checkout abandonment, a post-purchase series, cross-sell or replenishment flows, and a win-back flow for lapsing customers. Many also benefit from back-in-stock, price drop, birthday and VIP flows. The right mix depends on your products and buying cycle, so we build Klaviyo flows around how your customers really shop, then keep testing timing, content and offers to improve results.
Can you migrate us from Mailchimp to Klaviyo?
Yes. We handle Mailchimp to Klaviyo migrations as well as moves from ActiveCampaign, Omnisend, Dotdigital and other platforms. That includes importing subscribers with their consent status, connecting your store, recreating templates and rebuilding your flows. We plan the switch carefully so your deliverability is protected, warming up sending gradually rather than moving everything overnight. Migration is also a chance to improve, so we usually rebuild key flows to a higher standard rather than copying them across as they were.
How much does a Klaviyo agency cost?
It depends on the size of your list, how many flows and campaigns you need and whether you want design and copy included. Klaviyo audits and one-off projects are priced as fixed fees. Ongoing Klaviyo management is a monthly retainer that scales with the scope of the programme. We will always tell you what we think the account can earn before we talk about fees, so you can judge the return, and we are happy to start with an audit so you can see how we work first.
How do you use Klaviyo segmentation?
We use Klaviyo profiles and events to group customers by what they do and are likely to do next, including purchase history, products viewed, order frequency, recency, engagement and predicted lifetime value. That lets us send different messages to new customers, loyal regulars, high spenders and people drifting away. Good segmentation lifts engagement and revenue, and it protects deliverability by focusing most of your sending on the people who actually want to hear from you.
Do you use Klaviyo’s AI and predictive features?
Yes. Klaviyo includes predictive analytics such as expected next order date, predicted lifetime value and churn risk, along with AI tools for content and send times. We use these alongside our own agents, which analyse your account data, suggest what to test and draft copy and segments for review. Every recommendation is checked by our Klaviyo specialists before anything goes live, so you get the speed of AI with the judgement of people who know your brand.
Do you run Klaviyo SMS as well as email?
Yes. Klaviyo SMS works best when it is planned with email rather than bolted on, so we build SMS into the same flows and campaign calendar, with sensible frequency caps and clear consent capture that meets UK rules. Typical uses are cart recovery, launch and restock alerts, VIP early access and delivery updates. We report SMS revenue separately so you can see what it adds on top of email.
How do you improve deliverability in Klaviyo?
We set up a dedicated sending domain with proper authentication, warm up new accounts and domains gradually and keep your list clean by suppressing unengaged and invalid profiles. We send most often to your most engaged segments and monitor bounce rates, spam complaints and inbox placement continuously. Good deliverability is the foundation everything else is built on, because even the best flow earns nothing if it lands in spam.
Does Klaviyo work with Shopify?
Yes, and the Klaviyo Shopify integration is one of the platform’s biggest strengths. Customer, product and order data from Shopify syncs into Klaviyo, which powers abandoned cart and browse flows, product recommendations, segmentation and revenue reporting. We make sure the integration is set up correctly, including catalogue feeds and any custom events you need, so your Klaviyo account has the full picture of every customer. We also work with Klaviyo on WooCommerce, BigCommerce and Magento.
How do you measure Klaviyo performance?
We focus on revenue rather than vanity metrics. That means attributed revenue by flow, campaign and segment, Klaviyo’s share of total online sales, repeat purchase rate and customer lifetime value, alongside engagement and deliverability health. We report on these regularly in plain language, explaining what changed, why and what we are doing next, so you always know what Klaviyo is contributing to the business.
How do we choose the best Klaviyo agency for our brand?
Look for a Klaviyo partner agency with a recognised partner tier, people who work in the platform every day, results on brands like yours and a clear view on data and deliverability, not just design. Ask who will actually run your account, how often you will hear from them and what they would do in the first ninety days. A good agency will start with an audit and be specific about where the revenue is. If you want to compare us with others, that conversation is the best place to start.
How do we get started with Vertical?
The best first step is a conversation about your goals and where Klaviyo sits today. From there we usually run a Klaviyo audit and share a prioritised plan, then agree a scope and ways of working that suit your team. Whether you need a full Klaviyo partner agency to run everything or specialist help on specific projects such as a migration or a flow rebuild, we will tell you plainly where we think the biggest opportunities are.
