The verdict in three sentences
Headless decouples the storefront (fast front end) from the commerce engine, for a faster, more flexible site. In 2026 in Amsterdam, a headless replatforming costs 40,000 to 100,000 EUR over 3 to 5 months, catalogue migration and SEO plan included. It is justified when performance genuinely caps your conversion; otherwise, optimising your current site costs 5 to 10 times less.
What a headless rebuild costs
The budget breaks down by work package; here is the 2026 order of magnitude.
| Package | Cost (EUR) | Timeline |
|---|---|---|
| Scoping + headless architecture | 5,000 - 12,000 | 2-4 wks |
| Front end (Next.js / Nuxt) | 15,000 - 40,000 | 6-10 wks |
| Commerce engine connection + API | 8,000 - 20,000 | 3-5 wks |
| Catalogue + media migration | 4,000 - 12,000 | 2-4 wks |
| SEO plan + 301 redirects | 4,000 - 9,000 | 2-3 wks |
| QA + performance + go-live | 4,000 - 10,000 | 2-3 wks |
The front end holds most of the budget because it delivers the speed gain. Skimping on migration SEO is a false economy: a post-migration traffic drop costs far more than the 301 package.
Gains, risks and when NOT to do it
Headless is not always profitable. Here are the 2026 benchmarks.
| Criterion | Expected effect | Note |
|---|---|---|
| Load speed | -40 to -60% time | Depends on front end |
| Conversion | +10 to +15% | Estimate, to be measured |
| SEO traffic after migration | Stable to +5% | If 301 plan is rigorous |
| Maintenance cost | +15 to +25% | Two layers to manage |
| Migration risk | Medium | Redirects, data |
| Relevance threshold | > 300,000 EUR revenue/yr | Else optimise existing |
Below 300,000 EUR annual revenue, or if your current site is already fast, stick to targeted optimisation (cache, images, hosting) before considering headless.
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Mini case study
Julien, owner of an outdoor-equipment online store in Amsterdam (1.8M EUR revenue/yr, 1.4% conversion), lost mobile sales to a 4.2 s load time. A headless rebuild at 72,000 EUR brought load time to 1.6 s and lifted conversion to 1.6%, up 0.2 point. On 1.8M EUR of equivalent traffic, that is about 257,000 EUR of extra sales/year; at 42% gross margin, the gain covers the investment in a little over 8 months.
FAQ
Does headless really improve SEO? Indirectly: a faster site improves Core Web Vitals and experience, which helps ranking. But without a rigorous 301 redirect plan, a migration can instead cause a traffic drop.
How long does the migration take? Budget 3 to 5 months depending on catalogue size and the number of URLs to redirect. Catalogue and SEO, not code, are often the critical path.
Will I lose my ranking during the switch? Not if the 301 plan maps every old URL to the new one and the sitemap is resubmitted. Plan a 4 to 8 week monitoring window post-migration.
Can I keep my current back office? Often yes: headless keeps your commerce engine (Shopify, WooCommerce, Magento) and replaces only the front end. That is what caps the budget.
When is headless not justified? Below 300,000 EUR revenue, with a simple catalogue and an already fast site, classic optimisation gives a better immediate return.
Let's scope your project. Share your revenue, current platform and load times: we assess whether headless pays off and price the rebuild, SEO plan included. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
