The verdict in three sentences
A B2B store still running on PrestaShop 1.6 with 40 unmaintained modules is a security risk and a sales bottleneck, because this version no longer gets patches and depends on obsolete PHP versions. As a 2026 ballpark, a full replatforming costs EUR 20,000 to 55,000 excluding VAT for an industrial parts supplier in Madrid, including migration of 12,000 product records and customer accounts, over 3 to 4 months. The budget hinges on three items: data migration, customer group pricing and the 301 redirect plan that protects your search rankings.
Why PrestaShop 1.6 becomes dangerous in 2026
PrestaShop 1.6 has been superseded by the 1.7, 8 and 9 branches, and no security updates are released for 1.6 anymore. Hosting providers push towards PHP 8.1 or newer, which this version does not support without hacks. Every abandoned third party module is a potential entry point, especially payment, import and quote modules.
| Risk | Situation on PrestaShop 1.6 | Consequence for a B2B seller |
|---|---|---|
| Security patches | No longer published | Exposure to known module vulnerabilities |
| PHP version | Stuck on PHP 7.1 or older | Hosting increasingly expensive or refused |
| 40 unmaintained modules | Break each other at every fix | One outage can block orders for days |
| Performance | Slow catalogue pages on 12,000 SKUs | Buyers go back to phoning in orders |
| Payment and invoicing | Old modules, uncertain compliance | Hard to prepare for Spain's B2B e-invoicing rules |
| Finding contractors | Few developers willing to work on it | Rising hourly maintenance cost |
The question is no longer whether to migrate, but to what and with what budget.
Migration options and their cost
| Target | Migration cost (2026 ballpark) | Annual recurring cost | Fits if |
|---|---|---|---|
| PrestaShop 8 or 9 with B2B modules | EUR 20,000 to 35,000 | EUR 3,000 to 8,000 in licences and maintenance | You want to stay in a familiar ecosystem |
| Shopify Plus with B2B features | EUR 25,000 to 45,000 | about EUR 2,300 a month subscription | Standard catalogue, few pricing rules |
| Sylius or open source B2B framework | EUR 35,000 to 55,000 | EUR 5,000 to 12,000 in maintenance | Complex pricing, ERP connection |
| Custom platform | EUR 40,000 and up | Hosting and maintenance on a fixed fee | Very specific journey, advanced customer portal |
Whatever the target, the most underestimated item is data migration: 12,000 records with variants, manufacturer part numbers and PDF datasheets, plus customer accounts with their price groups, multiple delivery addresses and order history. Allow 25 to 35 % of the budget for this step alone.
Kolonell works on these projects when the need goes beyond a version change: a custom B2B portal connected to your ERP, within its complex application grid of 7M to 15M+ FCFA (EUR 10,670 to 22,870 and up), followed by maintenance at 35,000 to 120,000 FCFA a month depending on support level.
The 3 to 4 month migration plan
| Step | Duration | Checkpoint |
|---|---|---|
| Audit of the 40 modules and the data | 2 weeks | List of modules to replace, drop or rebuild |
| Target choice and mockups | 2 to 3 weeks | Quick order flow, online quotes |
| Product and customer migration | 3 to 4 weeks | 12,000 records checked, passwords reset cleanly |
| Group pricing and terms | 2 weeks | Net prices tested on 30 real accounts |
| 301 redirect plan | 1 to 2 weeks | 100 % of indexed URLs redirected |
| Acceptance, cutover and follow up | 2 to 3 weeks | Search Console monitoring for 60 days |
The 301 plan deserves special care: without clean redirects, a B2B site can lose 30 to 50 % of its organic traffic within weeks, and long tail product pages are often the ones bringing in new accounts.
Mini case study
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Javier, manager of an industrial parts supplier in Madrid, makes EUR 2.4M of online revenue a year on PrestaShop 1.6. A payment module failure already cost him 4 days of orders, about EUR 2.4M ÷ 250 days × 4 = EUR 38,400 of delayed or lost revenue. He picks a EUR 40,000 migration. If the new store, with one click reordering and visible group pricing, lifts online sales by 8 %, that is EUR 192,000 of extra revenue, or EUR 57,600 of gross margin at 30 %. The project pays back in under 9 months. Illustrative scenario, to adapt to your margins.
FAQ
How much does replatforming a PrestaShop 1.6 B2B store cost in 2026?
As a ballpark, EUR 20,000 to 55,000 excluding VAT depending on the target, the number of modules to replace and data volume. For 12,000 records and a few hundred customer accounts, most projects land between EUR 30,000 and 45,000.
Can we simply upgrade to PrestaShop 8 or 9?
There is no reliable direct upgrade path from 1.6: the theme and most modules must be rebuilt. In practice it is a migration, with data moved onto a fresh installation.
Will customers need to recreate their accounts?
No, accounts, addresses and price groups are migrated. Depending on the target, passwords may need a reset, to be announced by email a week before cutover.
How do we avoid losing our search rankings?
List every indexed URL, redirect each one with a 301 to its equivalent and monitor Search Console for 60 days. A well executed plan keeps the traffic dip under 10 % in the first weeks.
How long will the store be offline?
Cutover usually happens overnight or over a weekend, with 2 to 6 hours of downtime. The rest of the project, 3 to 4 months, runs on a staging environment.
Let's scope your project. Send us your module list, product volume and group pricing rules: we will return an audit, an indicative budget and a 3 to 4 month plan. 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.
