The verdict in three sentences
A corporate replatforming in 2026 sits between 25,000 and 70,000 EUR depending on content volume and integration complexity. This is not a graphic redesign: it is a stack change that involves governance, SEO and compliance. The number-one risk is a poorly prepared double run, which can blow the budget by 15 to 25 %.
The four phases of a controlled replatforming
A large account never switches over in one night. The method is structured in milestone-driven phases, each with contractual deliverables.
| Phase | Duration | Deliverable | Indicative cost |
|---|---|---|---|
| Audit + scoping | 4-6 weeks | content map, spec | 5,000-12,000 EUR |
| POC + architecture | 3-4 weeks | technical prototype, CMS choice | 4,000-10,000 EUR |
| Migration + build | 6-10 weeks | target site, 300-2,000 pages | 12,000-35,000 EUR |
| Cutover + double run | 8-12 weeks | go-live, monitoring | 4,000-13,000 EUR |
The scoping phase is the one IT directors underestimate most: yet it is what fixes the exact scope and avoids change orders.
What the range covers by volume
Price depends first on the number of pages to migrate and the governance required (validation workflow, roles, multilingual).
| Content volume | Governance | Total budget | Maintenance/month |
|---|---|---|---|
| 300-600 pages | simple validation | 25,000-38,000 EUR | 400-600 EUR |
| 600-1,200 pages | 2-level workflow | 38,000-55,000 EUR | 600-800 EUR |
| 1,200-2,000 pages | workflow + accessibility + multilingual | 55,000-70,000 EUR | 800-1,000 EUR |
Accessibility compliance (WCAG/EAA) is not optional in 2026 for a large account: it represents 8 to 12 % of the budget but avoids penalties and protects the brand.
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Mini case study
Claire, digital director of a 1,400-employee services group in Paris, leads the migration of a 950-page site off an ageing proprietary CMS. Selected quote: 52,000 EUR, split into 4 phases over 6 months, with a 10-week double run. The double run costs 9,000 EUR but avoids a service outage and an estimated loss of 30,000 monthly visitors. Maintenance drops from 1,100 EUR/month (previous vendor + license) to 720 EUR/month. Annual maintenance saving: 4,560 EUR, plus article publishing time cut threefold thanks to the built-in editorial workflow.
FAQ
How long does a full replatforming take? From 4 to 7 months for a 300-to-2,000-page site, including an incompressible 4-to-6-week scoping phase and a 2-to-3-month double run.
Can we avoid the double run? Rarely for a large account. The double run guarantees no critical URL or content is lost; skipping it saves 4,000 to 13,000 EUR but multiplies SEO-break risk.
Who should lead on the client side? A single owner (digital director or project lead) plus one business validator per department. Without clear internal governance, timelines slip 20 to 30 %.
Is accessibility compliance really mandatory? For large enterprises and the European Accessibility Act, yes. Penalties reach 50,000 EUR and the initial audit costs 2,000 to 5,000 EUR.
Change the CMS or just the front-end? It depends on the governance you want. If the current back-office blocks editorial teams, a modern headless CMS is justified; otherwise, a front-end stack change alone is enough.
Let's scope your project. Send us your page count, current CMS and cutover deadline, and we will structure the phases and an indicative budget between 25,000 and 70,000 EUR. 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.
