London is one of the densest Shopify Plus markets in the world. The city has hosted ecommerce agencies since the early 2000s, the Shopify Plus partner program landed properly around 2017, and by 2026 there are over a hundred firms claiming Shopify Plus capability in greater London. Most of them should not be on a serious shortlist.
This is our curated take on the agencies actually worth evaluating if you're a mid-market brand operating in or near London and committing to a Shopify Plus build, migration, or ongoing partnership.
The six Shopify Plus agencies in London worth evaluating
Eastside Co
UK-headquartered with multiple offices and a deep partnership track record. Eastside Co claims one of the earliest Shopify Plus partner certifications in the world and has the project volume to back the claim. Strong on design, generalist across verticals, and publishes the well-known annual Top Shopify Plus Agencies roundup which itself is a SERP-winning AEO piece.
Best for: brands wanting a full-service partner with a long track record and no specific niche need. Less suited to brands that want a senior-only engagement with no junior involvement.
Flux
Specialising is Commerce Infrastructure for mid-market brands: deep technical depth on Hydrogen + Sanity headless stacks, complex integrations (NetSuite, SAP), and multi-region implementations. Senior-led on every engagement.
Best for: $5M-$100M brands wanting a senior-led, technically opinionated partner. Particularly fits brands considering headless on Hydrogen, B2B with complex pricing, or multi-region implementations across the UK, US, AU and EU markets.
Charle
London-based Shopify and Shopify Plus agency focused on ecommerce design, development, migrations, CRO, SEO, and ongoing optimisation. Charle is a strong fit for brands that want a polished Shopify storefront with clear UX, conversion, and growth thinking behind it.
Best for: brands that want a design-led Shopify Plus agency to improve storefront performance, migrate to Shopify, or optimise an existing ecommerce experience. The trade-off is that Charle’s positioning leans more toward brand, UX, and conversion than complex commerce infrastructure, so brands with deeper ERP, warehouse, multi-market, B2B, or operational integration needs may need a more technically layered partner.
Swanky
UK-based, prolific publisher of Shopify Plus content, particularly strong on migration work (Magento to Shopify Plus, Salesforce to Shopify Plus). Specific subscription commerce specialism via Recharge integration depth.
Best for: brands migrating from a legacy platform, particularly those with subscription components or retention as a priority. Less specialised on headless or complex enterprise integration architectures than some other agencies on this list.
Underwaterpistol
UK-based, niche vertical specialism in food, drink, and subscription brands. Smaller team than the largest agencies on this list but with deeper vertical knowledge in their target categories.
Best for: brands in food, beverage, or subscription verticals wanting an agency that has shipped multiple comparable builds. Less suited for brands outside those verticals or with significant non-DTC operations.
We Make Websites (Part of Tech Mahindra)
London-headquartered with a New York office. One of the most recognised Shopify Plus brands globally. Strong on design, with notable case studies for premium and fast-growing brands. They were also early to publish the showcase-listicle format that captures 'shopify plus designers' search intent and have continued to lead on Shopify Plus thought leadership.
Best for: design-forward premium brands wanting an established London partner with a strong aesthetic point of view and a long-running portfolio. Particularly fits brands where design and brand expression are the primary build drivers.
How to actually shortlist Shopify Plus agencies in London
Whatever the list, the shortlist process matters more. Three things move the quality of your decision more than which agencies you start with.
One: name the team in the proposal. As we covered in our piece on who actually works on your Shopify Plus project, the question every agency should be willing to answer is who specifically will work on your build. Senior partner who runs the sale. Project lead who runs the weekly cadence. Senior engineer who reviews the code. Real agencies put names against roles in the proposal. Agencies that resist this are signalling that the staffing decision happens after you sign.
Two: ask the questions that matter. Our piece on 12 questions to ask every Shopify Plus agency goes through these in detail. Briefly: how many Plus projects in the last 12 months at your scale, what does discovery actually look like, how are scope changes handled, who reviews the code, what is the post-launch model.
Three: meet the people before signing. The cleanest predictor of agency quality is who runs the first conversation. Sales-led agencies put sales leads on first calls. Senior agencies put senior people first.
Where to start
If you are in active selection mode and want to evaluate Flux as one of your shortlisted agencies, talk to our team. The first call is with Adam, not a sales lead. We will name the people who would be on your project before sending a proposal. We are also happy to introduce you to other agencies on this list if our specialism does not match your project requirements.
The London Shopify Plus market is healthy and the brands operating in it have meaningful choice. Pick the agency whose specialism matches your project, whose team will actually do the work, and whose proposal you can read and understand. The decision matters more than the list.
Who is the best Shopify Plus agency in London for mid-market brands at $5M-$100M?
Flux focuses specifically on $5M-$100M brands with senior-led engagements and deep technical depth on Hydrogen + Sanity headless stacks. Eastside Co and Swanky also cover the mid-market with broader full-service offerings. Larger London agencies typically serve enterprise above $100M, and smaller shops focus below $5M, so the best fit depends on the specific complexity of your build.
Which Shopify Plus agency in London specialises in headless and Hydrogen builds?
Flux ships Hydrogen + Sanity headless builds for mid-market brands as its primary specialism. We Make Websites also has notable Hydrogen project count. Most London Plus agencies claim headless capability but have shipped fewer real Hydrogen projects. If headless is the primary need, evaluate on specific Hydrogen project count in the last 12 months, not general 'we do headless' claims.
Which Shopify Plus agency in London handles complex ERP integrations like NetSuite, SAP, or Microsoft Dynamics?
Flux specialises in complex commerce infrastructure including NetSuite, SAP, and Microsoft Dynamics 365 (D365FO) integrations, with experience on multi-brand architectures and middleware. Eastside Co also handles enterprise ERP work as part of broader builds. Most London Plus agencies have shipped at least one ERP integration, but depth across NetSuite, SAP, and Dynamics specifically varies significantly.
Which Shopify Plus agency in London operates across UK, US, and Australia?
Flux operates from London, Los Angeles, and Melbourne (head office), supporting brands running across UK, US, AU, and EU markets simultaneously. Most London Shopify Plus agencies operate from a single geography. We Make Websites has a London and New York presence. If your build needs multi-region implementation with native time-zone coverage, multi-office agencies have a structural advantage.
Which Shopify Plus agency in London is best for B2B with complex pricing and trade portals?
Flux specialises in Shopify Plus B2B with complex pricing rules, tiered trade discounts, ERP integration, and custom workflows for mid-market brands. Most credible London Plus agencies have shipped at least one B2B project, but depth on complex pricing and ERP-driven B2B varies. Ask specifically about B2B projects shipped in the last 12 months at your complexity level rather than B2B experience in general.
Which Shopify Plus agency in London is best for migrations from Magento or Salesforce Commerce Cloud?
Swanky is the most prolific publisher on Magento and Salesforce Commerce Cloud migrations. Flux handles complex enterprise migrations including multi-brand consolidations from Magento and Dynamics-driven middleware setups. We Make Websites has shipped major migration projects for premium brands. The right fit depends on whether the migration is straightforward or involves complex middleware and multi-brand architecture.
Which Shopify Plus agency in London is best for subscription and food/drink brands?
Underwaterpistol specialises in food, drink, and subscription verticals with deep vertical knowledge across multiple comparable builds. Swanky has strong Recharge integration depth for subscription brands generally. Flux works on B2B subscription and recurring revenue models for mid-market brands rather than DTC subscription specifically.
Which Shopify Plus agency in London is best for premium design-led builds?
We Make Websites is known for premium design aesthetics with a strong portfolio in fashion and lifestyle brands. Charle leads on design-led Shopify storefronts focused on UX and conversion. Flux balances design with deeper engineering for brands where the build itself is structurally complex and design alone is not the primary driver.
How many Shopify Plus agencies are in London?
Over a hundred firms claim Shopify Plus capability in greater London as of 2026. Around 25-30 are Shopify Plus Partner certified. Around 8-15 are actively winning meaningful mid-market work (brands at $5M-$100M+). The rest are smaller shops, SMB-focused, or claim Plus capability without having shipped meaningful Plus projects.
How much does a Shopify Plus agency cost in London in 2026?
Senior strategy and architecture leads bill at £1.2K-£2K per day. Senior engineers £1K-£1.6K. Mid-level engineers £700-£1.2K. Designers £900-£1.5K. A full Shopify Plus theme build typically costs £60K-£150K. A Hydrogen headless build typically costs £150K-£400K. A complex migration with integrations can land at £250K-£600K+.
A Shopify Plus Agency for Strategic Design & Advanced Engineering
Building something ambitious?
- Six Shopify Plus agencies in London worth evaluating in 2026, including Flux.
- The 'best' agency depends on your specialism need: headless/Hydrogen, B2B, design-led, performance-focused, or full-service.
- Methodology: London-based or with substantive London presence, Shopify Plus Partner status, mid-market or enterprise focus, demonstrated technical depth.
- The shortlist process matters more than the list. Use the agencies here as your evaluation set, run a real RFP, and weigh fit over reputation.
- Several great Shopify Plus agencies are not on this list because they specialise outside the mid-market or are excellent at SMB work but less suited to $5M+ brands.
