The verdict in three sentences
A headless replatforming is not a technical whim: it answers fixed Magento costs of EUR 15,000 to 30,000 per year and a performance debt that drags down conversion. In 2026, budget EUR 55,000 to 130,000 and 14 to 22 weeks to rebuild the front end in Next.js on top of a commerce API. The return shows in the numbers: LCP from 3.4 s to 1.2 s and a measured +18% conversion in the first months.
Why leave Magento in 2026
The total cost of ownership of a Magento Commerce instance often exceeds the cost of a rebuild over three years. Between license, dedicated hosting, extensions and maintenance, an SME easily pays EUR 28,000 per year just to keep the existing store alive.
| Magento cost item | 2026 order of magnitude (EUR/year) |
|---|---|
| Adobe Commerce license | 12,000 - 22,000 |
| Dedicated hosting + CDN | 6,000 - 12,000 |
| Paid extensions | 2,500 - 6,000 |
| Maintenance / security fixes | 8,000 - 18,000 |
| Annual total | 28,500 - 58,000 |
A headless stack shifts spend to a one-off upfront investment, then a lighter maintenance line and cheaper shared hosting.
Costing the headless migration
| Scope | 2026 budget (EUR) | Timeline |
|---|---|---|
| Next.js front + design system | 22,000 - 45,000 | 8 - 12 wks |
| Commerce API + catalog | 12,000 - 30,000 | 4 - 8 wks |
| SEO carry-over + 301 redirects | 6,000 - 14,000 | 2 - 4 wks |
| Payment + ERP integration | 9,000 - 24,000 | 3 - 6 wks |
| Testing + cutover | 6,000 - 17,000 | 2 - 4 wks |
| Total | 55,000 - 130,000 | 14 - 22 wks |
Progressive or big-bang migration
| Criterion | Progressive (strangler) | Big-bang |
|---|---|---|
| SEO risk | Low (batch cutover) | High |
| Time to first gain | 4 - 6 weeks | 14 - 22 weeks |
| Coexistence cost | +8 to +15% | None |
| Technical complexity | High (two fronts) | Medium |
| Recommended for | Catalog > 5,000 SKUs | Catalog < 2,000 SKUs |
SEO carry-over is the critical point: an exhaustive 301 redirect plan, canonical URL preservation and Search Console monitoring prevent the traffic drop that ruins a poorly prepared replatforming.
Mini case study
Omar, e-commerce director of an industrial supplies SME in Dubai, pays EUR 26,000 a year for Magento and runs a 3.4 s LCP. His store generates EUR 2.4M a year at a 1.9% conversion rate. After a progressive migration at EUR 88,000, LCP drops to 1.2 s and conversion reaches 2.24% (+18%). The revenue gain is ~EUR 86,000 per year, plus EUR 14,000 a year saved on fixed costs: the investment pays back in about 11 months.
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FAQ
How long does a headless migration really take?
Between 14 and 22 weeks for a standard catalog. A progressive approach delivers first gains from week 4 to 6 but spreads the full cutover over several months.
Will I lose my search rankings?
Not if the 301 redirect plan is exhaustive and URLs are preserved. Done well, a replatforming improves SEO by moving Core Web Vitals into the green (LCP < 2.5 s).
What is the maintenance cost after migration?
Budget EUR 1,200 to 3,000 per month depending on order volume and integrations, often less than your current Magento maintenance.
Can we keep our ERP and PIM?
Yes. Headless architecture talks over APIs: ERP, PIM and payment tools stay in place and connect to the new front end.
Is +18% conversion realistic?
It is an order of magnitude seen when LCP drops below 1.5 s. Actual gain depends on your starting point: the slower today's site, the bigger the uplift.
Let's scope your project. Share your SKU count, online revenue and integrations (ERP, PIM, payment) for a quote between EUR 55,000 and 130,000. 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.
