The verdict in three sentences
An ageing PrestaShop costs you more than you think: paid modules, slowness and bugs at every update. In 2026, migrating to a headless stack (Next.js + Medusa) costs 30,000 to 80,000 EUR, over a 4 to 8 month timeline. The return comes from the performance gain (2x to 3x), module savings (1,000 to 5,000 EUR/year) and a conversion rate improved by speed.
Stay or migrate: the real calculation
Optimising the existing store is sometimes enough. Here's how to weigh optimised PrestaShop against headless custom in 2026.
| Criterion | Optimised PrestaShop | Headless custom |
|---|---|---|
| Upfront cost | 5,000 - 15,000 EUR | 30,000 - 80,000 EUR |
| Paid modules/year | 1,000 - 5,000 EUR | ~0 (in-house) |
| Performance (LCP) | 2.5 - 4 s | 0.8 - 1.5 s |
| Update pain | high | low |
| Customisation | module-limited | total |
| Timeline | 4 - 8 weeks | 4 - 8 months |
| Maintenance | 300 - 800 EUR/mo | 600 - 1,500 EUR/mo |
If your catalogue is simple and performance acceptable, optimising PrestaShop is enough. Once you stack slowness, endless modules and specific needs, custom becomes cheaper over 3 years.
Migration risks and how to control them
A botched replatforming destroys SEO and cash flow. Here are the key risks and their countermeasures.
| Risk | Potential impact | Countermeasure |
|---|---|---|
| SEO loss | -30 to -60 % traffic | Exhaustive 301 redirect plan |
| Catalogue migration | price/stock errors | Mapping + product-by-product testing |
| Customer migration | lost accounts/orders | Data reprise + login tests |
| Service outage | lost sales | Gradual cutover, off-peak window |
| Budget overrun | +20 to +40 % | Frozen scope, prioritised batches |
| Team training | back-office unmastered | Sessions + delivered documentation |
The most underestimated item is the 301 redirect plan: without it, you lose years of ranking. Plan a full URL audit before cutover.
Mini case study
Lena, director of a decor e-commerce in Berlin (900,000 EUR/year revenue), suffered a PrestaShop loading in 3.8 s, 4,200 EUR/year in modules and a 1.3 % conversion rate. She invested 52,000 EUR in a migration to Next.js + Medusa, plus 900 EUR/month in maintenance.
LCP drops to 1.2 s and conversion rises to 1.7 %, i.e. +0.4 point on 900,000 EUR of revenue: roughly +180,000 EUR/year of potential extra revenue (at equivalent margin), plus 4,200 EUR/year saved on modules. The project pays for itself in under 6 months on the conversion lift alone.
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FAQ
How much does a PrestaShop-to-custom migration cost?
Between 30,000 and 80,000 EUR in 2026 for a headless stack (Next.js + Medusa), depending on catalogue size and number of integrations. The timeline runs 4 to 8 months.
Will I lose my Google ranking?
Not if you prepare an exhaustive 301 redirect plan before cutover. Without it, loss can reach 30-60 % of traffic; with it, SEO holds or even improves thanks to speed.
How much will I save on modules?
Between 1,000 and 5,000 EUR/year in PrestaShop module licences, replaced by in-house features. This saving directly contributes to the project's payback.
What performance gain should I expect?
A factor of 2x to 3x on load times (LCP from 3-4 s to 1-1.5 s). Speed improves SEO and conversion, often by several tenths of a point.
How long does the project take?
Expect 4 to 8 months for a full headless migration, including catalogue, customers, orders and SEO reprise. A PrestaShop optimisation, by contrast, takes 4 to 8 weeks.
Let's scope your project. Send us your catalogue size, your revenue and your current pain points, and we'll frame migration or optimisation with an indicative budget. 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.
