The verdict in three sentences
Migrating a B2B e-commerce site from Magento to a modern stack costs in 2026 between EUR 40,000 and 110,000, over a 5 to 9 month build. The risks to control: catalog and customer migration, SEO preservation (301 redirects) and carrying over per-customer pricing. The gain: performance improved by 40 %, sharply lower maintenance cost and a scalable platform.
What a replatforming costs in 2026
| Scope | Content | Budget EUR | Timeline |
|---|---|---|---|
| Base migration | Catalog, customers, orders, redirects | 40,000 - 60,000 | 5 - 6 months |
| Migration + B2B | + per-customer pricing, accounts, workflow | 60,000 - 85,000 | 6 - 7 months |
| Migration + integration | + ERP, PIM, multi-channel | 85,000 - 110,000 | 7 - 9 months |
| Full redesign | + new UX, PWA, custom | 110,000 - 160,000 | 9 - 12 months |
The most sensitive item is data migration: the larger and more poorly structured the catalog and customer history, the costlier the cleanup (EUR 5,000 to 15,000 of data recovery).
Why leave Magento: the calculation
| Item | Magento (legacy) | Modern stack |
|---|---|---|
| Hosting | EUR 800 - 2,500/month | EUR 150 - 500/month |
| Maintenance / fixes | EUR 1,500 - 3,500/month | EUR 600 - 1,400/month |
| Load time | 3 - 6 s | 1 - 2 s |
| Security updates | heavy, risky | continuous, light |
| Evolution cost | high | moderate |
Halving or thirding load time directly improves B2B conversion and SEO: every second saved can be worth several conversion points.
Preserving SEO: the redirect plan
| Action | Goal | Impact if neglected |
|---|---|---|
| URL mapping | Map old to new URLs | -20 to -40 % traffic |
| 301 redirects | Transfer SEO authority | ranking loss |
| Metadata preservation | Titles, descriptions, tags | CTR drop |
| Sitemap + reindex | Speed up recognition | recovery delay |
| Post-migration tracking | Detect 404s | traffic leakage |
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Mini case study
Nadia, e-commerce director of a B2B distributor in Dublin, runs on Magento with hosting at EUR 1,900/month and maintenance at EUR 2,800/month, i.e. EUR 4,700/month of recurring cost (EUR 56,400/year). The site loads in 4.5 s and security updates are a nightmare.
After a replatforming at EUR 82,000, hosting drops to EUR 450/month and maintenance to EUR 1,200/month, i.e. EUR 1,650/month (EUR 19,800/year): a saving of EUR 36,600/year. Load time falls to 1.6 s (about -40 % on render), conversion rises +12 %, and SEO is preserved thanks to a rigorous 301 plan. The migration pays back in ~27 months on running-cost savings alone, before the conversion uplift.
FAQ
How long does a Magento migration take? Expect 5 to 6 months for a base migration, 7 to 9 months with ERP/PIM integration and full B2B pricing recovery.
Will we lose our SEO? Not if an exhaustive 301 redirect plan is prepared before cutover: full URL mapping, metadata preservation and 404 tracking. Without it, traffic can fall 20 to 40 %.
What maintenance saving to expect? Moving to a modern stack often divides recurring costs by 2 to 3: from EUR 4,000-5,000/month to EUR 1,500-2,000/month depending on scope.
Must everything be redone at once? No: you can migrate the base and catalog first, then add ERP integration and new functions in phases to smooth budget and risk.
What concrete performance gain? Load time going from 4-5 s to 1-2 s improves B2B conversion, cuts bounce rate and strengthens SEO, with a typical impact of +10 to +15 % conversion.
Let's scope your project. Share your SKU volume, your customer history and your current integrations, and we will cost your Magento migration with an SEO 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.