How Much Does It Cost to Build an E-Commerce Web App?
A custom e-commerce web app — product catalog, cart, checkout, order management — runs €5,500–20,000 with a solo developer. Agencies quote €35,000–100,000. Shopify covers simple storefronts; custom builds make sense when you need non-standard logic.
Last updated: April 2026
€35k–€100k
EUR typical range
Timeline: 12–31 weeks
€10k–€36k
EUR typical range
Timeline: 8–20 weeks
€6k–€20k
EUR typical range
Timeline: 6–14 weeks
- 01Product catalog with categories, variants, and images
- 02Shopping cart and checkout with Stripe or payment gateway
- 03Order confirmation emails and basic order history
- 04Admin panel for product and order management
- 05Responsive storefront deployable to Vercel
- Catalog complexity — variants, bundles, digital goods, and subscription products each add scope
- Checkout customisation — multi-step forms, shipping calculators, and tax logic vary significantly by region
- Inventory management — real-time stock tracking across multiple warehouses or channels
- Order operations — fulfillment workflows, returns, and partial refunds are often underestimated
- ERP or warehouse management system integration
- Multi-currency and multi-language storefronts
- Affiliate or referral program
- Mobile app (iOS/Android)
How much does it cost to build a E-Commerce Web App?
A E-Commerce Web App costs €6k–€20k with a senior solo developer. Agencies typically quote €35k–€100k for equivalent scope. The gap is overhead, not quality.
How long does it take to build a E-Commerce Web App?
A E-Commerce Web App takes 6–14 weeks with a senior solo developer using AI-augmented workflows. Agency timelines run longer due to discovery phases, hand-offs, and approval gates.
What is included in a E-Commerce Web App build?
- Product catalog with categories, variants, and images
- Shopping cart and checkout with Stripe or payment gateway
- Order confirmation emails and basic order history
- Admin panel for product and order management
What factors drive E-Commerce Web App development cost?
- 01Catalog complexity — variants, bundles, digital goods, and subscription products each add scope
- 02Checkout customisation — multi-step forms, shipping calculators, and tax logic vary significantly by region
- 03Inventory management — real-time stock tracking across multiple warehouses or channels
For most e-commerce needs under 500 SKUs with standard checkout, a well-configured Shopify is a better investment than a custom build. When you have non-standard logic — custom pricing rules, subscription models, embedded ordering — that's where a custom build pays off and I can scope it precisely.