Building an Online Store: Costs and Options in 2026

You want to sell online. Maybe you already sell through marketplaces or social media, but you know that a dedicated online store looks more professional, gives you better margins, and makes you less dependent on platforms that change their rules on a whim. The big question: what does it actually cost to build an online store in 2026, and which approach fits your situation?

The answer depends on three things: the complexity of your product catalogue, how deeply the store needs to integrate with your existing systems, and how distinctive you want the customer experience to be. This article lays out the options side by side — from ready-made SaaS platforms to fully custom-built stores — so you can make an informed decision.

SaaS Platforms vs. Custom Development: The Fundamental Difference

The online store market splits into two camps.

SaaS platforms (Shopify, WooCommerce, Lightspeed, BigCommerce) provide ready-made infrastructure. You pay a monthly subscription, choose a theme, upload your products, and you are live. The technical side — hosting, security, updates — is handled for you.

Custom development means a developer builds a store that fits your exact processes, branding, and functionality. You have complete control, but also complete responsibility for maintenance and further development.

Both approaches have their place. The key is knowing when each one makes sense. For a broader perspective on the build-vs-buy question, read our detailed article on custom software vs. off-the-shelf solutions.

Costs by Approach: An Honest Overview

Option 1: SaaS Platform with Standard Theme — €500–€3,000

This is the most affordable route. You choose a platform like Shopify or WooCommerce, select a paid theme (€50–€300), configure your product catalogue, and go live. Monthly costs range from €30 to €200, depending on the platform and extensions you choose.

Best for: Startups, product businesses with fewer than 100 products, entrepreneurs who want to quickly test whether online sales work. If you are just getting started, this is comparable to the entry level when having a website built.

Limitations: Limited support for complex product configurations, B2B pricing models with customer-specific discounts, or deep integrations with your ERP or warehouse management system.

Option 2: SaaS Platform with Custom Work — €3,000–€15,000

The most popular option for SMBs with specific requirements. You start on a platform like Shopify or WooCommerce, but have an agency customise the theme to your brand, build custom functionality through plugins or custom code, and integrate the store with existing systems.

Best for: Businesses with 50–5,000 products, specific customer experience requirements, and the need for connections to accounting software or inventory systems.

Option 3: Fully Custom Build — €15,000–€80,000+

A fully custom-built store using a modern framework like Next.js, a headless CMS, and a tailor-made checkout. This is the route for businesses where a standard platform genuinely falls short — complex product configurators, B2B portals with customer-specific assortments and pricing, or marketplaces where multiple sellers connect.

Best for: Businesses with online revenue above €500,000, complex product logic, or the ambition to use e-commerce as a competitive differentiator. Learn more about when custom development is worth the investment in our article on custom software.

What Determines the Price of an Online Store?

The cost range is wide. These factors make the difference:

1. Number of products and product complexity A store with 20 simple products (photo, price, description) is fundamentally different from a store with 5,000 products across 12 categories, each with 6 variants, customer-specific pricing, and inventory connections. The more complex your catalogue, the higher the costs — regardless of which platform you choose.

2. Integrations with existing systems Does the store need to connect to your ERP (SAP, Exact), your inventory management system, your accounting software, or an external fulfilment warehouse? Each integration adds €1,000–€5,000 to the initial costs. Read more about how automating business processes connects to your e-commerce strategy.

3. Design and branding A standard theme is quick to set up but does not differentiate you. Custom design costs more but strengthens your brand and conversion rates. Expect €2,000–€10,000 on top of the technical development for a distinctive design.

4. Payment and shipping options Dutch customers expect iDEAL, credit card, and often Klarna or pay-later options. International sales add currency conversion, customs handling, and multiple shipping methods. Each payment provider and shipping integration adds complexity.

5. SEO and marketing functionality A store without traffic is an expensive business card. Budget €1,000–€5,000 for SEO optimisation at launch, and €500–€2,000 per month for ongoing SEO and content marketing.

6. Multi-language support Do you also sell internationally? A bilingual or multilingual store adds 20–40% to the design and development costs, plus ongoing translation costs for product descriptions.

Considering using AI for your online store or retail business? Read how AI is transforming retail and e-commerce — from inventory management to personalized recommendations.

When Is Custom Worth the Investment?

Not every business needs a custom-built store. But in certain situations, it is the only option that truly fits:

• Complex product configuration: Customers need to assemble products from multiple options (material, size, colour, accessories). Standard platforms support this only partially.
• B2B with customer-specific logic: Different customer groups see different prices, assortments, or delivery terms. This requires a custom-built client portal.
• High volumes with specific performance requirements: Above 10,000 orders per month, the transaction fees of SaaS platforms become significant. Custom can be cheaper per transaction.
• Unique customer experience as a competitive advantage: If the way customers discover and buy your products is a distinguishing factor, that justifies a custom solution.

If you are unsure, start with a SaaS platform and migrate to custom when the limitations demonstrably cost you revenue. That is not failure — that is smart phasing.

The Hidden Costs of Starting Cheap

A cheap start is not always the cheapest choice in the long run. These are pitfalls we encounter regularly:

Plugin sprawl: With WooCommerce, many stores end up with 15–30 plugins, each with its own updates, compatibility issues, and security risks. Maintaining them can quickly cost €200–€500 per month.

Platform costs that scale with you: Shopify charges 0.5–2% transaction fees on top of the payment provider. At €500,000 annual revenue, that is €2,500–€10,000 extra per year — money that stays in your pocket with a custom solution.

Migration costs: If you outgrow your SaaS platform after two years, migrating to a custom solution costs €10,000–€30,000. Customer data, order history, SEO rankings, and URL structures all need careful transfer.

Security incidents: Outdated plugins or insecure configurations lead to hacks, data breaches, and loss of customer trust. Preventive maintenance is always cheaper than crisis management.

A Smart Investment Strategy

The most sensible approach for most SMBs:

Start with validation (€1,000–€3,000). Launch quickly on a SaaS platform. Test your market, learn which products sell, which customer segments you attract, and which functionality you actually need. This phase takes three to six months.

Optimise what works (€3,000–€10,000). Invest in custom design, better product photography, and the integrations that reduce your manual work. Connect your store to your accounting and admin systems and inventory system.

Scale when proven (€15,000+). Once your online revenue grows consistently and you feel the limitations of your platform, build a custom solution based on concrete data — not assumptions. At this point you know exactly what functionality you need.

Common Mistakes When Building an Online Store

After hundreds of e-commerce projects, these are the patterns that keep recurring:

Too many features at launch. Start with the minimum needed to sell. Loyalty programmes, wishlists, and advanced filters can be added later when you have data that justifies the investment.

No mobile optimisation. In 2026, more than 70% of e-commerce traffic comes from mobile devices. A store that does not work smoothly on a phone is a store that loses money.

Forgetting SEO. A technically perfect store without organic traffic forces you into permanent advertising. Invest in technical SEO, product descriptions, and category pages that rank from day one.

No measurement plan. If you do not measure, you do not know what works. Install analytics, set up conversion tracking, and measure your acquisition costs per channel from day 1. More on the importance of measurability in our article on app development, where the same principles apply.

Choosing the Right Partner

Whether you are having a SaaS platform configured or a custom store built, your choice of partner matters as much as your choice of technology.

Look for:

• References in your industry. An agency that builds fashion stores has different expertise than one that builds B2B portals.
• Code ownership. With custom work: is the code yours, or are you locked into the vendor?
• Ongoing support. Who helps you after launch? How quickly are issues resolved?
• Transparent pricing. Ask for a detailed quote with hourly rates and estimated hours per component. No vague "total package" without specification.

An experienced web developer thinks not only about the technology, but also about your business processes, growth strategy, and total cost of ownership over three to five years.

Conclusion: What Is the Best Choice for Your Business?

There is no universal answer. But here is a rule of thumb:

• Online revenue under €50,000/year: Start with Shopify or WooCommerce + standard theme. Investment: €1,000–€3,000.
• Revenue €50,000–€500,000/year: SaaS platform with custom design and integrations. Investment: €5,000–€15,000.
• Revenue above €500,000/year or complex B2B logic: Seriously consider custom software. Investment: €15,000–€80,000, but the ROI often justifies it within 12–18 months.

Regardless of your choice: start with a clear plan, measure everything, and invest in phases. That way you build a store that grows with your business instead of limiting it.