Custom ecommerce development in the UK typically costs between £4,000 and £45,000 for most businesses, though projects range from £1,800 for a basic starter store to £90,000 or more for headless and enterprise-grade builds. The price depends on catalogue complexity, integration count, design depth, and how custom the frontend actually needs to be.
If you have started asking agencies for quotes, you already know the frustrating part. Nobody gives you a straight number. You get "it depends," a discovery call booking link, and maybe a vague range that swings from £2,000 to £200,000.
Agencies do this for a real reason. Ecommerce projects vary a lot. But founders and ops leads still need a working number to plan a budget around. So here is an honest breakdown of what custom ecommerce development actually costs in the UK in 2026, broken down by project size, with the factors that push your quote up or down.
What Does Custom Ecommerce Development Cost in the UK?
Most UK businesses spend between £4,000 and £45,000 to get a professional ecommerce store built. Small, template-based stores sit at the lower end. Fully bespoke, headless builds with deep integrations sit well above it, often past £80,000.
Here is the tier-by-tier breakdown.
UK Ecommerce Development Cost by Project Tier
1. Starter Stores: £1,800 to £5,500
This covers a Shopify or WooCommerce store built on a paid or lightly customised theme. You get standard product pages, a working cart and checkout, basic SEO setup, and a handful of core apps or plugins for reviews, email capture, and analytics. Timeline: two to four weeks from kickoff to launch.
This tier suits a founder launching their first product line, testing an idea, or replacing an outdated site without a big feature list.
What it does not include: custom UX design, product configurators, multi-currency logic, or any backend integrations beyond a payment gateway.
2. Growth Stores: £5,500 to £14,000
This is where most established SMBs land. You are still on Shopify or WooCommerce, but the theme is heavily customised or built from a design file rather than picked off the shelf. Expect custom product filtering, a second payment method or a Buy Now Pay Later option like Klarna, basic email marketing automation, and a store structure designed around conversion rather than defaults.
A brand doing six figures in revenue with a catalogue of a few hundred SKUs typically needs a build in this range. Timeline: six to ten weeks.
3. Custom Builds: £12,000 to £32,000
Once you need real custom development work, whether that is a product configurator, subscription billing, complex variant logic, or an integration with an ERP or inventory system, you move into custom build territory. This is genuine software development, not theme customisation. A developer is writing bespoke logic, testing edge cases, and building admin tools that do not exist in a standard theme.
Worth flagging: this is also where integration count matters most. One clean ERP connection is manageable. Three or four, each with their own quirks, is where budgets climb fast.
Brands scaling past seven figures, or those with operational complexity like made-to-order products or B2B pricing tiers, tend to sit here. Build timelines run two to four months depending on integration count.
4. Headless and Enterprise Builds: £32,000 to £90,000+
At the top end, you are decoupling the frontend from the commerce backend. The storefront typically runs in Next.js or React while the backend runs on Shopify Plus, Commercetools, or a similar commerce API. This buys you faster page loads, more design freedom, and the flexibility to run the same backend across web, app, and other channels.
This tier makes sense once you are running deep integrations across CRM, warehouse management, and multiple sales channels, or when page speed and Core Web Vitals are directly tied to revenue at your scale. Expect three to six months of build time and a team that includes a backend developer, a frontend developer, and a project lead.
UK Ecommerce Development Cost Summary Table
| Tier | Price Range (GBP) | Typical Timeline |
|---|---|---|
| Starter store | £1,800 to £5,500 | 2 to 4 weeks |
| Growth store | £5,500 to £14,000 | 6 to 10 weeks |
| Custom build | £12,000 to £32,000 | 2 to 4 months |
| Headless / enterprise | £32,000 to £90,000+ | 3 to 6 months |
These numbers sit a little below what most UK agencies quote for equivalent scope. At Xorblin, rates are leaner because the team is smaller and senior, rather than built around a heavy account management layer. That overhead is usually what inflates agency invoices without adding to the build itself.
What Actually Moves the Price Up or Down?
Ask any agency for a quote and the number they give you depends on five things more than anything else.
Catalogue size and complexity. A store with 60 products and no variants is a different job from one managing 8,000 SKUs across sizes, colours, and bundles. More complexity means more testing and more edge cases that need handling before launch.
Integrations. Connecting your store to an ERP, a PIM, or a CRM takes senior development time and platform-specific knowledge. One clean integration is manageable inside most budgets. A web of five or six, each with its own quirks, is where costs climb fastest.
Custom versus templated. A themed build reuses proven, tested components, which keeps cost down and timelines short. A fully custom build means designing and engineering nearly everything from scratch. That difference alone can multiply a quote several times over.
Design depth. A theme with light customisation is quick to ship. A completely bespoke UX process, with original wireframes, user testing, and a design system built around your brand, takes considerably longer and costs more. But it also tends to convert better long term.
Payment and checkout complexity. A single gateway like Stripe takes a day or two to wire up, including testing. Add a second gateway, a Buy Now Pay Later provider, and multi-currency checkout for international customers, and you are adding real days to the build. Not hours.
Ongoing Costs Most Agencies Do Not Mention Upfront
The build cost is only half the picture. Once your store is live, you are paying for:
- Hosting or platform fees: roughly £25 to £300 a month depending on tier and traffic
- App or plugin subscriptions: typically £50 to £250 a month as you scale
- Payment processing fees: around 1.5% to 3% per transaction
- Ongoing maintenance or support if you are not handling updates in-house
Budget an extra £3,000 to £10,000 a year on top of your build cost once you factor all of this in. Agencies who quote you a build price without mentioning this are not giving you the full picture. Ask directly during any discovery call.
Questions to Ask Before Signing Anything
Before you commit to a quote, get clarity on four things.
Is the price fixed, or will it change once development starts? What happens if scope grows partway through? Who owns the codebase once the project ends? And what does post-launch support actually cover, because "support" means very different things across agencies.
A good agency should answer all four without hesitation. And the answers should be in writing before any deposit changes hands.
How to Get a Budget Number You Can Actually Plan Around
Nobody can give you an exact figure without understanding your catalogue, your integrations, and how custom you actually need the frontend to be. But the ranges above should give you a realistic starting point, whether you are budgeting for a first store or scoping a full replatform.
A few additional things worth knowing when you are comparing quotes:
- Cheaper is not always better. A quote 40 to 50% below comparable proposals usually hides undisclosed offshore resourcing, cut scope, or inexperience at your complexity level.
- A vague scope of work is a contract for disagreements. If a proposal does not state what is included, what is excluded, how changes are handled, and what the acceptance criteria are, you do not have a contract. You have an intention.
- Clean exit terms matter. Agencies that keep code, credentials, or documentation hostage cost you far more than their invoices suggest.
If you want a scoped quote rather than a rough range, Xorblin builds custom ecommerce stores for UK brands end to end, from a first Shopify build through to fully headless architecture. You can read more about how the team approaches ecommerce projects on the ecommerce development agency page, or reach out directly for a free scoping call.
