How much does an E-Commerce app cost in the UK?

September 23rd, 2026 at 05:05 pm

Last updated: September 2026

Author: Ronak Shah, Nordstone — app development consultancy

An e-commerce app in the UK typically costs £25,000–£80,000 for a simple branded store, £80,000–£200,000 for a feature-rich store with personalisation and loyalty, and £150,000–£500,000+ for a multi-vendor marketplace. Cost is driven mainly by catalogue complexity, payment and inventory integrations, and how much personalisation and account functionality you need beyond a standard checkout.

TL;DR

• Cost bands: Simple branded store £25k–£80k · Feature-rich store £80k–£200k · Marketplace £150k–£500k+.
• What drives cost: catalogue size and search complexity, payment gateway integration, personalisation and recommendations, and inventory/ERP/CRM connections?
• Key integrations: commerce platform or headless backend, payment gateway (Stripe, PayPal, Shopify Payments), inventory/ERP systems, CRM and email marketing tools.
• Native vs Shopify vs PWA: Shopify-based apps suit merchants under roughly £5m turnover wanting speed; custom native or cross-platform apps pay off above that, or where the experience needs to be genuinely differentiated.
• Ongoing costs: budget 15–20% of build cost per year for maintenance, plus payment processing fees (typically 1.5–2%+ per transaction) and hosting that scales with traffic.
• Ways to save: headless/Shopify-based builds, a phased MVP-first roadmap, and cross-platform frameworks over separate native builds.

What does an e-commerce app cost in the UK?

Most UK e-commerce apps fall into three bands, and the biggest cost driver isn’t platform choice — its how many parties and how much complexity sit behind the checkout. For context on how this compares with app development generally, see our mobile app development cost in the UK breakdown. A single-brand store selling your own products has a comparatively contained scope: catalogue, cart, checkout, and account and order history. A feature-rich store adds personalization, loyalty, subscriptions or advanced search on top. A marketplace connecting multiple sellers to buyers is a different order of complexity entirely, because it needs vendor onboarding, split payments, commission handling and moderation — features that don’t exist at all in a single-brand build.

Simple branded store

A single-brand app selling your own catalogue is the most contained build: product listings, cart, one or two payment methods, and basic account functionality. Costs stay towards the lower end when the catalogue is modest and you’re integrating one payment gateway rather than several, and rise as you add wish lists, guest checkout, multiple currencies or shipping-rate calculators.

Feature-rich store

Once you add personalised recommendations, loyalty points, subscription or repeat-order functionality, and deeper integration with a CRM or ERP system for stock and customer data, cost rises accordingly — this band is where most established retailers moving beyond a first app land, and where the return on investment tends to be clearest given an existing customer base.

Marketplace

A marketplace connecting multiple sellers to buyers carries the highest cost because nearly every feature has to account for more than one party: seller onboarding and verification, split payments and payout schedules (commonly built on Stripe Connect), commission calculation, dispute handling and content moderation. Budgeting four to six weeks of backend development for split-payment logic alone is realistic before any storefront work begins.

What drives e-commerce app cost?

Four factors do most of the work in moving a quote up or down. Catalogue size and structure matters because a few dozen SKUs with simple categories is a different build to tens of thousands of products needing faceted search, variants (size, colour) and bulk import tools. Payments add cost in proportion to how many methods and currencies you support — a single UK card gateway is straightforward, but adding Apple Pay, Google Pay, buy-now-pay-later options and multi-currency checkout each add integration and testing time. Personalisation — recommendation engines, browsing history, tailored offers — increases both backend complexity and ongoing data infrastructure cost, since it typically needs event tracking and a recommendation layer running continuously, not just a one-off feature. Integrations with existing business systems — inventory management, ERP, CRM, email marketing, fulfilment/logistics providers — are often underestimated at quoting stage, because each one requires mapping data models between two systems that weren’t designed to talk to each other, and testing what happens when they disagree.

Key integrations

Most e-commerce apps connect to a similar core set of systems, even when the storefront itself looks very different. The commerce platform or headless backend (Shopify, Big Commerce, or a fully custom headless build) is the foundation everything else plugs into. A payment gateway — Stripe, PayPal, or a platform’s native processor such as Shopify Payments — handles the actual transaction; UK online card processing rates typically run from around 1.4–2% plus a small fixed fee per transaction depending on provider and volume, and marketplaces specifically tend to use Stripe Connect to handle split payouts across multiple sellers. If you’re weighing up regulated payment handling more broadly, our guide to how much a fintech app costs in the UK covers the compliance layer that applies once you move beyond standard checkout processing. Inventory and ERP systems keep stock levels and order data in sync between your app, warehouse and any physical retail locations, which becomes essential once you’re selling through more than one channel. CRM and email marketing tools connect customer and order data to marketing platforms for abandoned-cart recovery, loyalty communications and segmented campaigns — often the highest-ROI integration for a retailer with an existing customer base, since it turns app data into revenue without new customer acquisition spend.

Native app vs Shopify vs PWA for retail

For most UK merchants under roughly £5 million in annual online turnover, a Shopify-based app (using Shopify’s own mobile app tooling or a Shopify-integrated builder) makes the most sense: fast to launch, lower cost, and backed by a platform handling hosting, security and PCI compliance for you — Shopify’s plans in the UK currently range from around £25 to £259 a month before transaction fees, which sit between roughly 1.5% and 2% plus 25p per card transaction depending on plan. Beyond that revenue level, or where the brand experience needs to be genuinely distinctive rather than templated, a custom native or cross-platform app typically becomes worth the extra investment — cross-platform frameworks like React Native or Flutter now handle most retail requirements well and cost 30–40% less than building separate native iOS and Android apps. A PWA is worth serious consideration as a middle step for retailers not yet ready to commit to a full native app: it delivers an installable, semi-offline-capable mobile experience at a fraction of native cost, though push notification reach on iOS remains weaker than native and there’s no App Store or Google Play listing to help with discovery — see our app vs website decision guide for a fuller breakdown of when a PWA is the right call, and our guide to launching an app on the App Store and Google Play for what native app-store discovery actually involves.

Ongoing costs

As with most app categories, budget 15–20% of your initial build cost per year for general maintenance, security updates and bug fixes. On top of that, e-commerce apps carry ongoing payment processing fees that scale directly with sales volume — typically 1.5–2%+ per transaction depending on your gateway and plan — which is worth modelling against projected revenue rather than treating as a rounding error, since at meaningful sales volumes this becomes one of the largest ongoing costs of running the app at all. Hosting and infrastructure costs also scale with traffic: a modest store might run on £50–£200 a month in infrastructure, while a high-traffic retailer during peak periods (Black Friday, seasonal sales) can see this rise into the thousands, and it’s worth load-testing before your first major sales event rather than discovering capacity limits live.

How to reduce e-commerce app cost

The clearest saving for most retailers is building on Shopify or another established commerce platform rather than fully custom, particularly via a headless approach that uses the platform’s backend while giving you a custom storefront — this typically saves significant development time without the compromises of a fully template build. An MVP-first, phased approach — launching with core catalogue, checkout and one payment method, then adding personalisation, loyalty and deeper integrations once the store is trading — reduces upfront risk and lets real sales data guide where the next investment should go. Cross-platform development remains the standard recommendation for most retail apps in 2026, since the performance gap with native has narrowed enough that the 30–40% cost saving rarely comes with a meaningful trade-off for typical shopping-app use cases. Finally, as with other categories of app development, genuinely novel engineering work — a bespoke recommendation algorithm, custom fraud detection, or new checkout logic — can potentially qualify for R&D tax relief, worth checking with an accountant before ruling it out.

Frequently asked questions

Get an e-commerce app estimate

Every e-commerce build has a different mix of catalogue complexity, integrations and payment requirements. If you’d like a costed breakdown against your specific store — simple branded app, feature-rich retail experience, or full marketplace — get in touch with Nordstone for a free scoping conversation.