8 Best Klaviyo Agencies for London DTC Brands (2026)

Hiring a Klaviyo agency in London usually starts with a search for one nearby. That is the wrong first filter. Two of the strongest Klaviyo teams in Britain run from Devon and Greater Manchester, and plenty of London’s fastest-growing DTC brands have their retention programmes run from well outside the M25.

Specialism beats postcode. Brands that get retention right hire for proof, then let geography sort itself out. What follows is the eight Klaviyo agencies we would shortlist for a London DTC brand in 2026, ordered by hiring fit, with the criteria set out below. Every partner tier, ours included, was read off Klaviyo’s own directory in August 2026.

The Best Klaviyo Agencies for London DTC Brands

How Do We Know These Are the Best Klaviyo Agencies for London?

Four criteria decided the roster. Current Klaviyo partner status, read from Klaviyo’s partner directory in August 2026, because tiers are re-reviewed twice a year and website footers lag behind them. Demonstrable DTC ecommerce work, with named clients. Published client results. And fit for the situations a London DTC brand actually hires from.

A London address was never a criterion. The work runs inside your Klaviyo account and your Slack, and a postcode has no bearing on whether churn comes down. Twelve candidates were rejected during verification, mostly because the directory did not support the tier their site advertised, or because a London address turned out to be a virtual office.

Every tier below was checked profile by profile in August 2026, so we have not repeated the date on each entry. We can read those tiers with some authority because we held the top one - the Elite Master badge, 2025-2026 - which roughly 40 agencies worldwide carried, by our count of the directory. And every result we claim for our own work carries a link, with the strongest of them sitting on other companies’ websites.

YOCTO

YOCTO is the Klaviyo Elite retention agency for fast-growing DTC and subscription brands, and the practice rests on one observation: a subscription P&L is decided after checkout. So we run that whole side of it. Subscription offers, cancellation flows, failed-payment recovery, and cohort LTV analysis sit with the same team that builds the Klaviyo email and SMS programmes executing them, inside Loop, Recharge, and Skio. We are headquartered in Nicosia and have worked with London DTC brands for years. The flagship is Healf, the Financial Times’ #1 fastest-growing company in Europe for 2026, whose retention programme we run.

Who We Work With

DTC and subscription brands doing $5M to $150M, mostly in the US and UK. In London that means Healf, Elavate Collagen, ELEAT, GutSupp, Myoovi, and Wavy. Beyond the capital it includes Pharmacy Online, one of the UK’s largest online pharmacies. We have also worked with Heights, the London braincare brand, earlier in its growth.

Results We’re Proud Of

• Healf: 5x email revenue - with unsubscribes down more than 40% along the way
• Myoovi: 44% of revenue from email inside 60 days - for a London femtech brand
• Heights: win-backs up 38% and upsell conversions up 46% - from our years with the brand, a former client

Every agency’s own lift percentages are marketing until somebody independent publishes them. Ours have been published repeatedly. Klaviyo, Skio, Loop, Bubblehouse, Paper Run, Opensend, and Zaymo have each written up YOCTO client work on their own domains, with the numbers in the headlines.

The rest of the library lives in our ecommerce case studies.

YOCTO at a Glance

• Klaviyo Elite Master, 2025-2026; one of roughly 40 agencies worldwide at our count of the directory. Platinum-tier Loop Subscriptions partner
• Scope: subscription offers and churn, cancellation and dunning flows, lifecycle email and SMS, cohort LTV analytics
• Headquartered in Nicosia, Cyprus; years of London DTC work across GMT and EET working hours
• Simple month-to-month packages from €5,500

Magnet Monster

Magnet Monster answers a specific procurement headache: retention usually means four vendors, so Adam Kitchen’s team sells email, SMS, WhatsApp, and direct mail together, on a flat monthly fee with unlimited sends. The team works from Sale, Greater Manchester, for a client list that includes Laura Geller, Waterdrop, Outerknown, and Spotlight Oral Care. Published wins include a 200% email revenue increase for Carved.

Who They Work With

Scaled DTC brands in the UK and US consolidating every retention channel with one team instead of four vendor relationships.

Magnet Monster at a Glance

• Listed as Klaviyo Platinum Master in the directory in August 2026; the agency markets an Elite badge of its own
• Based in Sale, Greater Manchester
• Channels: email, SMS, WhatsApp, direct mail
• Flat monthly fee with unlimited sends

Email Kong

Email Kong positions itself as a Klaviyo-first CRM agency, and the work matches the label: Klaviyo builds, list growth, deliverability, and the CRM layer that connects acquisition to retention. Co-founder Bogdan Mihalache registered the company in London in 2021, and new clients are gated at roughly $2M in annual revenue, on the argument that a serious build-out needs volume behind it. Results on the site include a 146% lift in returning-customer revenue for KittySpout.

Who They Work With

London DTC brands past the $2M mark that have outgrown a templated Klaviyo setup and want the account engineered around how they actually sell.

Email Kong at a Glance

• Klaviyo Platinum Master
• London-registered, founded 2021
• Scope: Klaviyo email and SMS, CRM, deliverability, list growth
• Minimum client size: roughly $2M in annual revenue

Enchant Agency

Enchant Agency runs email, SMS, WhatsApp, push, and loyalty as one CRM programme under one strategy, which sounds obvious and is rarely staffed for. Philip Storey’s team on Great Portland Street includes a dedicated deliverability lead and a behavioural scientist, a hiring pattern that shows where it thinks results come from. Clients range from Self Portrait, for whom Enchant reports a 390% increase in email revenue, to Bohomoon and Timex.

Who They Work With

Brands that want the whole message layer designed and run as one programme, from London with offices into Europe and the US.

Enchant Agency at a Glance

• Klaviyo Platinum Master; nine years as a Klaviyo partner, by the agency’s count
• Great Portland Street, London, with offices in Cambridge, Berlin, and New York
• Scope: email, SMS, WhatsApp, push, loyalty programmes
• Team includes a dedicated deliverability lead and a behavioural scientist

Get Better

Get Better is the list’s Klaviyo purist. Rich Evans founded the agency in North Devon in 2022 after years as a Klaviyo user, roughly 95% of its work runs on the platform, and Klaviyo made the agency the subject of a partner case study of its own. The team of about 20 leans into food, drink, and supplements, with PerfectTed and Magic Madhouse on the wall; for Magic Madhouse it reports campaign revenue up 594%.

Who They Work With

Food, drink, and supplement brands that want campaign and flow revenue grown where Klaviyo is the entire practice.

Get Better at a Glance

• Klaviyo Elite Master
• Founded 2022 in Barnstaple, North Devon; team of about 20
• Roughly 95% of client work runs on Klaviyo; subject of Klaviyo’s own partner case study
• Scope: Klaviyo management, flows, campaigns, design, SMS

ElliotDigital

ElliotDigital is the design pick. Elliot Scott’s London agency, founded in 2022, treats the inbox as part of the brand, and the portfolio for SURREAL, Magic Mind, Days Brewing, and PÄRLA is properly art-directed where most agency email is templated. It publishes fewer numbers than its peers here, which is worth weighing, though one client, XITE, credits Klaviyo with half its revenue.

Who They Work With

Design-led London DTC brands in drinks, wellness, and beauty, for whom every send is a brand asset first.

ElliotDigital at a Glance

• Klaviyo Platinum Master
• Founded 2022; London, founder-led by Elliot Scott
• Scope: email and SMS strategy, design, copy, automation
• Portfolio: SURREAL, Magic Mind, Days Brewing, PÄRLA, HUX

Melusine Studio

Melusine Studio is small by design, in the studio’s own words, and the structure backs the phrase: London-registered and remote since 2019, taking few accounts at a time. The client list is heavier than the headcount implies, with REFY, Daniel Wellington, Grown Alchemist, and Fable & Mane on it, and the scope runs from email and SMS through RCS, push, and CRM audits.

Who They Work With

Beauty, fashion, and lifestyle brands that want senior strategists in the account every week.

Melusine Studio at a Glance

• Klaviyo Platinum Master
• Founded 2019; registered in London WC1; remote, 8am to 5pm GMT
• Deliberately small client roster
• Scope: email, SMS, RCS, push, CRM audits

Swanky

Swanky comes at retention from the store side. This Exeter agency has spent about fifteen years in ecommerce, runs offices in Brisbane and Montpellier, and builds on Shopify Plus, so subscription mechanics and lifecycle get engineered by the people who built the storefront. Its subscription credentials run deep: Swanky worked with Huel early in the brand’s run, building its subscription experience on Recharge, and YuMOVE, Symprove, and Loop Earplugs appear across its client wall.

Who They Work With

Subscription and replenishment brands on Shopify Plus that want storefront and retention engineered together.

Swanky at a Glance

• Klaviyo Platinum Master
• HQ in Exeter, UK, with offices in Brisbane and Montpellier
• Around fifteen years in ecommerce; Shopify Plus specialists
• Scope: Shopify Plus builds, CRO, subscription setups, lifecycle email

Which One Should You Call First?

Start from the symptom. If churn is creeping, reorders land late against a day 28 to 30 replenishment cycle, or LTV to CAC has slid under 2.5:1 (healthy runs to about 4:1, and our LTV calculator will place you), you are hiring for retention: you want a customer retention agency that also works inside your subscription platform. That is the brief YOCTO exists for, and on Shopify Plus it is Swanky’s home turf too.

If the bottleneck is a single channel, hire for the channel. The core programme belongs with an ecommerce email marketing agency, texting with an SMS marketing agency. And if sends are landing in spam, an email deliverability agency comes first, because nothing else counts until you reach the inbox again. Otherwise, match temperament: Magnet Monster to consolidate four vendors into one, Email Kong for a first serious build past $2M, Enchant for the full message layer, ElliotDigital for design, Melusine for a small senior room, Get Better for food, drink, and supplements.

Starting the search this week, the priority order:

1. Pull three numbers before any call: repeat purchase rate, list growth, and LTV to CAC. If that ratio is under 2.5:1, retention is the hire.
2. Verify every finalist’s current badge on connect.klaviyo.com. Tiers are re-reviewed twice a year, and websites keep old badges up.
3. Ask each finalist for one result somebody else published, on a platform’s site or in the client’s own words. Self-reported lift percentages are marketing until then.
4. Match the specialist to the bottleneck: subscription economics, channel consolidation, design, or a single channel.
5. Before signing, confirm PECR soft opt-in handling, UK GDPR consent records, and that the Klaviyo account stays yours when you leave.

Our Recommendation

If your revenue problem lives after checkout, in churn, cancellations, failed payments, or flat reorder rates, that is the work we do all day. Seven platforms have attached their own names to our client results, which is the part you can check without taking our word for anything. The quickest way to find out whether we should talk is the subscription diagnostic: it maps where your retention programme leaks revenue and what to fix first, and it costs nothing.

Frequently Asked Questions

Does your Klaviyo agency need to be in London?

No. The work happens inside your Klaviyo account and your Slack, and two of the strongest Klaviyo teams in Britain run from Devon and Greater Manchester. What should decide the hire is working-hours overlap, fluency in PECR and UK GDPR, and named, checkable results with UK brands.

How do you check a Klaviyo agency’s real partner tier?

Look the agency up on Klaviyo’s partner directory at connect.klaviyo.com and read the badge on its profile, because website footers go stale. Tiers are re-reviewed twice a year, so a badge on an agency site can be a review cycle or two behind the directory. For the top tier itself, we keep a separate ranking of the best Klaviyo Elite Partner agencies.

How much does a Klaviyo agency cost in London?

Most agencies at this level quote custom retainers that start in the low four figures per month and climb well into five figures for large scopes; some gate new clients at roughly $2M in annual revenue. We run simple month-to-month packages from €5,500. What moves pricing up and down is broken down in our Klaviyo agency pricing guide.

What should a London DTC brand check before signing?

Four things. Who staffs the account day to day, and how many accounts each strategist carries. How the agency handles Klaviyo’s 16-hour Smart Sending window when campaigns and flows overlap. How it keeps complaint rates under the 0.1% threshold mailbox providers watch. And how it implements the PECR soft opt-in and keeps UK GDPR consent records, because a list built on bad consent is a liability wearing a growth number.

How quickly should a new agency show results?

Flows move first: a proper rebuild shows revenue inside 30 to 60 days, the window in which Myoovi reached 44% of revenue from email, and an abandonment series completing inside 48 to 72 hours pays back almost immediately. Cohort outcomes such as churn and LTV need a quarter or more to read honestly. An agency promising LTV gains in month one is reading attribution, and attribution flatters.

How do you switch Klaviyo agencies without losing revenue?

Run a short overlap between outgoing and incoming teams, keep the Klaviyo account and every asset under your own login, and have the new team audit flows before rebuilding anything. Document sending domains and deliverability history in the handover. The full playbook is in our guide to switching email marketing agencies without losing revenue.