We design and build custom Shopify themes that look like your brand, load quickly and are easy for your team to edit. Whether you need a fully bespoke Online Store 2.0 theme, a premium theme tailored to your brand or an old theme rebuilt, you get clean code, an itemised GBP quote and full ownership of your theme.
- Online Store 2.0 themes
- Fully editable in the theme editor
- Built for speed and Core Web Vitals
- You own the theme code
A Shopify theme that fits your brand, not the other way round
Your theme controls how every page of your store looks and behaves: the homepage, collections, product pages, cart and content. Ready-made themes are a great starting point, but many growing brands end up stacking apps and code workarounds onto them, which slows the store down and makes it look like everyone else's.
A custom Shopify theme is designed around your products, customers and brand, and built with only the code your store needs. Every section stays editable in the Shopify theme editor, so your team can update content without calling a developer.
Part of a wider project? See our Shopify development services.
Premium theme, customised theme or fully custom?
There's no single right answer. Here's how the three options compare.
| Premium theme as-is | Customised premium theme | Fully custom theme | |
|---|---|---|---|
| Brand fit | Generic | Good | Built for your brand |
| Performance | Varies; may include unused features | Can be tuned | Lean, only what you need |
| Custom features | Limited to theme settings and apps | Some custom sections | Designed around your products and journeys |
| Time to launch | Days | Weeks | 1 to 3 months |
| Cost | Lowest | Medium | Highest |
| Best for | New stores and tight budgets | Most growing brands | Established and fast-growing brands |
Not sure which fits? We'll recommend honestly, even if that means a lower-cost option.
Our Shopify theme services
From small improvements to a complete new storefront.
Bespoke theme development
A fully custom Online Store 2.0 theme designed and coded from scratch for your brand.
Premium theme customisation
Tailoring a premium theme with custom sections, layouts and styling, without starting from zero.
Theme design
Wireframes and visual designs for key templates, approved before any code is written.
Online Store 2.0 migration
Rebuilding older vintage themes with JSON templates, sections everywhere and app blocks.
Custom sections and blocks
Reusable, editable sections such as lookbooks, comparison tables, bundles and size guides.
Speed optimisation
Theme code, image, script and app clean-ups to improve Core Web Vitals.
Product page development
Rich variant pickers, personalisation fields, galleries and trust content that support conversion.
Theme redesigns
Refreshing an existing store's look and journeys while keeping its SEO intact.
Theme support
Ongoing fixes, new sections and seasonal updates on a monthly retainer.
What's built into every custom theme
- Sections everywhereAdd, remove and reorder sections on any page in the theme editor.
- Metafields and metaobjectsStructured product data such as materials, sizing and specifications shown automatically.
- App blocksApps added through the editor, without editing theme code.
- Mobile-first layoutsDesigned and tested on real phones, where most shoppers browse.
- AccessibilityKeyboard navigation, readable contrast and alt text, in line with WCAG guidance.
- SEO foundationsClean heading structure, product structured data and fast pages.
Our theme development process
Discovery
Brand, products, customers, apps and goals reviewed.
Wireframes
Page layouts and user journeys agreed.
Design
Visual designs for desktop and mobile.
Development
Liquid, sections and blocks built in a preview theme.
Testing
Devices, browsers, speed and accessibility checks.
Launch
Theme published, with redirects and monitoring.
Handover
Editor training and ongoing support.
How we build Shopify themes
| Area | Tools and approach |
|---|---|
| Theme architecture | Online Store 2.0, JSON templates, sections and blocks, Liquid |
| Front end | Semantic HTML, modern CSS, lightweight JavaScript with no heavy frameworks unless needed |
| Workflow | Shopify CLI, GitHub version control, preview themes for review |
| Quality | Theme linting, Lighthouse and Core Web Vitals checks, cross-device testing |
| Extensions | Theme app extensions and custom apps where a feature needs more than the theme |
Need functionality beyond the theme? See our Shopify app development services.
Custom Shopify theme pricing
Indicative UK ranges, excluding VAT, your Shopify plan and paid apps. Every project gets an itemised quote.
| Service | Typically includes | Typical cost | Timeline |
|---|---|---|---|
| Premium theme customisation | Branding, layout changes, a few custom sections | £3,000 – £8,000 | 3 – 5 weeks |
| Fully custom theme | Bespoke design and code for all key templates, custom sections | £8,000 – £20,000 | 6 – 12 weeks |
| Complex custom theme | Large catalogues, advanced product pages, multiple markets, integrations | £20,000+ | 3 months or more |
| Theme support | Fixes, new sections and updates | From around £300 a month | Ongoing |
Budgeting for running costs too? Read Shopify maintenance costs in the UK.
Get a free theme review
Send us your store link. We'll review your theme's speed, structure and design, and tell you whether to customise, rebuild or leave it as it is.
Why choose Fulminous Software for your Shopify theme
Design and code together
Designers and Shopify developers in one team, so designs are built as intended.
Editable by your team
Sections and settings planned so you rarely need a developer for content changes.
Performance first
Lean code and careful app choices for faster pages.
Honest advice
We'll tell you if a customised premium theme is enough.
Itemised GBP quotes
Clear proposals with VAT shown separately.
You own the code
Your custom theme lives in your Shopify account and belongs to you.
Based in or near London? See our Shopify theme development in London page.
Custom Shopify theme FAQs
What is a custom Shopify theme?
A custom Shopify theme is a storefront designed and coded specifically for your brand, rather than a ready-made theme from the Shopify Theme Store. It is built on Shopify's Online Store 2.0 architecture with Liquid, so your team can still edit pages, sections and content in the theme editor.
How much does custom Shopify theme development cost in the UK?
As a guide, customising a premium theme typically costs £3,000 to £8,000, and a fully bespoke custom theme £8,000 to £20,000. Larger stores with complex templates, many custom sections or integrations can cost more. Prices exclude VAT, your Shopify plan and any paid apps.
How long does it take to build a custom Shopify theme?
Customising a premium theme usually takes 3 to 5 weeks, and a bespoke custom theme 6 to 12 weeks, depending on the number of templates, sections and integrations, and how quickly designs are approved.
Should I use a premium theme or a custom theme?
A premium theme is faster and cheaper, and works well for many stores. A custom theme makes sense when your brand needs a distinctive look, you sell complex products, a premium theme is slowing your store down, or you are repeatedly paying to work around a theme's limits.
Will I be able to edit my custom theme myself?
Yes. We build custom sections and blocks that you can add, remove and reorder in the Shopify theme editor, with settings for text, images, colours and products, so day-to-day changes don't need a developer.
Can you convert my old theme to Online Store 2.0?
Yes. We can rebuild an older vintage theme on Online Store 2.0, adding JSON templates, sections on every page and app blocks, while keeping your design and protecting your SEO.
Will a custom theme make my store faster?
Usually. A custom theme only includes the code your store needs, and we optimise images, scripts and apps for Core Web Vitals. Page speed also depends on the apps, tracking scripts and content you add after launch.
Do I own the custom theme code?
Yes. The custom theme code we write for you is yours, and it sits in your own Shopify account. Third-party apps and any licensed fonts or assets remain subject to their own terms.
Ready for a Shopify theme that fits your brand?
Tell us about your store, products and goals. We'll recommend the right approach and send an itemised GBP quote.
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