How Much Does an E-Commerce Store Cost to Build?

The range you'll see quoted online — "anywhere from $5,000 to $500,000" — is technically accurate and practically useless. Let's be more specific. Custom e-commerce development costs are driven by a predictable set of factors. If you understand those factors, you can estimate your project accurately before talking to a single agency.

Cost Ranges by Complexity

These are realistic ranges for custom-built stores using a modern stack (Next.js, Shopify vs custom). Not Shopify themes. Not template-based builds.

• Simple product store: $8,000–$15,000 — up to ~50 products, standard variants, Stripe checkout, basic customer accounts, order confirmation emails, CMS for product management, responsive design. Single currency, single market, no custom integrations.
• Mid-scale custom store: $20,000–$40,000 — larger catalogue (50–500 SKUs), advanced filtering and search, multiple payment methods, subscription products, multi-currency, customer account portal, basic loyalty or referral mechanics, third-party shipping rate integration.
• Full custom platform: $45,000–$80,000+ — B2B features (account-level pricing, purchase approval workflows, credit terms), complex subscription logic, marketplace or multi-vendor features, ERP/WMS integration, advanced analytics, custom admin tooling. The upper bound is genuinely open-ended.

The 7 Biggest Cost Drivers

When a project estimate comes in higher than expected, it's almost always one of these seven things.

• Product count and catalogue complexity — going from 20 products to 2,000 SKUs is not a linear increase. Bulk import tooling, variant management at scale, inventory sync, and catalogue search all need to be properly engineered.
• Custom design — a properly built design system with brand tokens, component library, and responsive layouts takes real time. Full bespoke design from scratch adds $5,000–$15,000 to most projects.
• Subscriptions — recurring billing, free trials, pause/resume, upgrade/downgrade flows, dunning, and the subscriber self-service portal each need to be built and tested. Add $6,000–$12,000 for a well-implemented subscription layer.
• Multi-currency and international — handling actual currency conversion, tax rules (VAT in the EU is its own project), Stripe multi-currency settlement, and checkout localisation. Add $4,000–$8,000.
• Inventory management — if inventory is managed inside the store, you need stock level tracking, out-of-stock handling, back-order logic, and potentially warehouse location management.
• Third-party integrations — each integration has its own cost. A Klaviyo email sync is a day's work. A full NetSuite ERP integration is weeks.
• CMS requirements — a properly configured Payload CMS with custom fields for your specific content types adds a week to the project but pays back in reduced maintenance requests.

Ongoing Costs After Launch

The build cost is not the total cost of ownership.

• Hosting: a well-spec'd VPS for a custom Next.js + PostgreSQL stack runs $40–$120/month. Vercel's Pro tier is $20/month base plus usage.
• Payment processing: Stripe's standard rate is 1.4% + 30p for European cards, 2.9% + 30¢ for US cards. At $1M annual revenue this is approximately $14,000–$29,000/year.
• Maintenance: budget 2–4 developer hours per month for routine maintenance — dependency updates, occasional Stripe API version updates, infrastructure monitoring.
• Email: transactional email via Resend or similar costs $20–$60/month for most stores. Marketing email scales with list size.

Where Clients Typically Overspend and Underspend

Overspend: design revisions. More design rounds don't produce proportionally better outcomes beyond a certain point. Approve a design direction early and stick to it. Also: features that seemed important during scoping but don't serve real customer needs — most stores don't need wishlists, gift registries, or product comparison tools at launch.

Underspend: email. Order confirmation, abandoned cart, post-purchase sequence — these emails are among the highest-ROI investments in any e-commerce operation, and they're consistently scoped as an afterthought. Also: analytics setup. Getting Google Analytics 4 and conversion tracking right during the build is a fraction of the cost of retrofitting it later. For teams exploring headless e-commerce, the same principle applies — architect for flexibility upfront rather than rebuilding later.

Getting an Accurate Estimate

The most reliable way to get an accurate number is to scope your project with enough specificity that assumptions don't need to be made. The things that matter most: catalogue size and structure (number of products, variants, attribute types), checkout requirements (standard, subscription, B2B, international), required integrations (list specific systems, not categories), design approach (new design vs existing brand assets vs component library), and timeline (rushed timelines increase cost).

Read the complete custom e-commerce development guide.