The verdict in three sentences
A successful multilingual replatforming rests on cutover strategy, not code quality alone: big-bang to move fast or phased to de-risk. Budget 20,000-42,000 EUR and 12 to 20 weeks, with 1,000-2,200 EUR/month maintenance. The two risks to neutralize: downtime during DNS cutover and multilingual SEO loss if URL mapping is incomplete.
Big-bang or phased: comparing the two strategies
The approach choice drives risk, timeline and cost. Here is the comparison for a 5-language site. 2026 ballpark figures.
| Criterion | Big-bang | Phased (in waves) |
|---|---|---|
| Total timeline | 12 - 14 wks | 16 - 20 wks |
| Downtime risk | high | low |
| Multilingual SEO risk | concentrated | spread, controlled |
| Total cost | 20,000 - 30,000 EUR | 28,000 - 42,000 EUR |
| Rollback | global, abrupt | per wave, simple |
| Recommended for | sites < 100 pages | critical sites, 5+ languages |
For a high-pipeline B2B site, phased cutover costs more but avoids downtime that would hit all markets at once.
Per-phase cost and safety nets
A replatforming is steered phase by phase, each with its deliverable and rollback point. Here is the 2026 breakdown.
| Phase | Scope | 2026 EUR range |
|---|---|---|
| Audit + URL mapping | 5-language crawl, full mapping | 2,500 - 5,000 |
| Headless architecture | Stack, i18n, CMS | 5,000 - 10,000 |
| Content migration + 301 | Per language, content freeze | 4,000 - 9,000 |
| DNS cutover + double-run | Planning, monitoring | 2,000 - 4,000 |
| Rollback & QA | Tested rollback plan | 1,500 - 3,000 |
| Post-cutover stabilization | 90-day SEO monitoring | 2,000 - 4,000 |
The content freeze during migration and a tested rollback plan are the two nets that distinguish professional replatforming from a blind cutover.
Mini case study
Lukas, COO of a B2B SaaS company in Berlin, replatforms a 5-language site (DE, EN, FR, ES, IT) of 250 pages to headless. Phased approach chosen: audit 4,000 EUR + architecture 8,000 EUR + migration 7,000 EUR + cutover + rollback 5,000 EUR + stabilization 3,000 EUR = 27,000 EUR. A big-bang would have cost 21,000 EUR but a 48h downtime across his 5 markets would have frozen about 20 demo requests worth 2,500 EUR of pipeline each, i.e. 50,000 EUR of pipeline at risk. The 6,000 EUR premium of the phased approach is profitable insurance.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Big-bang or phased: how to decide?
Under 100 pages and low criticality: big-bang. Critical multilingual site with pipeline: phased, to limit downtime and spread SEO risk.
What is a content freeze and why?
It is the temporary halt of edits during migration to keep old and new in sync. Without a freeze, updates are lost.
Is rollback always possible?
Yes, if planned and tested before cutover. In phased mode, rollback happens per wave, limiting the impact of any issue.
How long does SEO stabilization take?
Expect 90 days of per-language ranking monitoring after cutover, to detect and fix any drift before it affects the business.
Is maintenance essential after replatforming?
Yes: 1,000 to 2,200 EUR/month covers upkeep, monitoring and multilingual fixes that protect the initial investment.
Let's scope your project. Tell us your languages, page volume and downtime tolerance: we will recommend big-bang or phased and price each phase. 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.
