Shopify Development Partner for UK Shopify Plus Brands

A Shopify Plus build starts from £15,000, a custom app from £4,000, and a headless Hydrogen storefront from £20,000 over 12 to 20 weeks. Fixed scope, quoted in writing after discovery, built by senior engineers for UK and EU brands that have outgrown a theme.

  • Shopify Partner
  • Senior engineers only
  • London based
Recent build: Veluare, luxury jewellery launch on Shopify

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Our Shopify development process

  1. DiscoveryEngineer-led brief. We pull your stack, integrations, and growth goals into a written scoping document before any code is touched.
  2. BuildTheme, custom app, Functions, Hydrogen, or B2B catalogue work, picked to the brief, not pushed because the agency only has one tool.
  3. QA + UATSide-by-side regression on a sample of representative orders, integration replays, performance budget verification before any DNS swap.
  4. Launch + supportCutover during low-traffic hours, monitoring window, and a scoped post-launch support period agreed in writing before the engagement closes.

What's included

  • A senior engineer on every project: no junior-only teams, no offshore sub-contracting
  • Shopify Plus, BigCommerce, SFCC, and NetSuite expertise in one team, useful when integrations cross platforms
  • Written architecture briefs, risk registers, and rollback plans you own and can re-read
  • Direct engineering communication: Slack or email with the people writing the code, not an account manager intermediary
  • Post-launch retainer option for ongoing performance, security, and feature work

Project timeline

Scoped per project

Project shape decides duration. A headless rebuild in 12-20 weeks; a custom app's window is set by scope and complexity, a migration's by data size and complexity. We confirm a window in writing once the discovery scan surfaces the real shape of the work. Quoting a fixed day-count beforehand is how scope creep starts.

Pricing and timelines

Verified October 2026. GBP, ex VAT.

EngagementTypical feeDurationWhat is in scope
Custom Shopify app (single store, single purpose)£4,000+Set after discovery
  • One Admin API or Storefront API integration, or one automated workflow
  • Written brief, test suite, deployment on your Shopify Partner account
  • Two weeks of post-launch fixes included
Shopify theme customisation£5,000+Set after discovery
  • Your existing Online Store 2.0 theme adapted to your branding
  • Changes agreed in writing before any code is written
  • QA on real orders before release
Custom Shopify theme£15,000+Set after discovery
  • Figma design and an Online Store 2.0 theme built from scratch, not a purchased template
  • Accessibility and Core Web Vitals checked on every template
  • Redirect map and launch plan
Shopify Plus build (theme, Functions, B2B)£20,000+Set after discovery
  • Online Store 2.0 theme built from your requirements, not a purchased template
  • Checkout Extensibility, Shopify Functions, B2B catalogues and Markets as the brief needs
  • ERP, CRM or 3PL integrations, side-by-side regression before cutover
Headless Hydrogen storefront£20,000+12 to 20 weeks
  • Hydrogen on Oxygen and the Storefront API, with checkout on Shopify's web checkout
  • Performance budget agreed up front and verified before launch
  • Rollback plan and architecture brief you own
Rescue or hand-over auditScoped separately1 week
  • Read of the existing codebase and integrations
  • Realistic cost to reach launch, and whether a partial rebuild is the honest route
  • Separately scoped; credited against the build if we continue

Firm pricing goes in writing after the discovery scan. The bands above are where the last twelve months of engagements landed; a project outside them is unusual, not impossible.

FAQ

What should you look for in a Shopify development partner?

Senior engineers who write the code, not only account managers. A written scope and fixed quote before work starts. Depth beyond themes: custom apps, Shopify Functions, Checkout Extensibility, B2B and the ERP or 3PL integrations your store depends on. And ownership: the code, the apps and the accounts should be yours, with an architecture brief and rollback plan you can hand to another team. We work this way on every engagement.

What are Shopify fees on top of the build?

Shopify bills its own plan separately from any build. On shopify.com/uk/pricing (checked October 2026) Basic is £19 a month paid yearly or £25 monthly, Grow £49 or £65, Advanced £259 or £344, and Plus starts at £1,800 a month. Online card rates with Shopify Payments start at 2%, 1.7%, 1.5% and 1.3% plus 25p by plan. If you use a third-party payment gateway instead, Shopify adds a transaction fee of 2%, 1%, 0.6% or 0.2%. Apps and themes are billed on top. Our Shopify vs Shopify Plus comparison sets the fees side by side.

What does a typical engagement cost?

Custom apps start from £4K; the price depends on scope and complexity. Plus builds start from £15K depending on B2B and integration scope; a Shopify theme starts from £5K to adapt an existing theme to your branding and from £15K for a custom design and build. Headless Hydrogen builds start from £20K. We share firm pricing in writing once the discovery scan is complete. Quoting before we've seen the brief is unfair to both sides.

How is No7 different from a freelance Shopify developer?

Freelancers are great for a single, well-defined task. We're built for engagements where multiple disciplines collide: custom apps that talk to ERP, headless storefronts that need to keep Plus features, B2B catalogues bridging Shopify and SFCC. We bring the senior engineer + architect + integration specialist as one team rather than asking the merchant to coordinate three separate freelancers.

Are you a Shopify Partner?

Yes. We are a Shopify Partner: we build and maintain Shopify apps through the Shopify Partner Program, including our own Anchor Loyalty app. Partner status is a baseline though. What we hire for is engineering depth across Plus internals (Functions, Flow, Markets, B2B), which partner status does not test.

Do you do theme work or only custom apps?

Both. We work across the full surface: Online Store 2.0 themes, Liquid customisation, custom apps (single-store and App Store), Checkout Extensibility, Functions, Hydrogen storefronts, and Flow automation. Most engagements mix two or three of these; we pick what the brief actually needs.

Can you take over a project that another agency started?

Yes. About a third of our work is rescue or hand-over. We start with a one-week stack audit (separately scoped) so we can give you an honest read on the existing codebase, the realistic cost to bring it to launch, and whether a partial rebuild is more honest than continuing.

Where are you based and which time zones do you cover?

London-based (Covent Garden). Remote-first across UK + EU + US Eastern overlap. Most of our merchants are UK + EU, with a meaningful slice on US Eastern. We schedule across these zones; deeper APAC coverage is engagement-specific.

Related services & guides

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