The verdict in three sentences
Leaving a proprietary CMS for an open solution (headless or open source) costs 10,000-28,000 € in 2026, but erases a 3,000-12,000 €/yr license and frees the site to evolve. The main risk — losing rankings — is kept under 5 % of traffic with a URL audit and a rigorous redirect plan. For a digital lead the equation is the break-even point: migration often pays for itself in 2 to 4 years on saved licensing alone.
One-shot vs recurring: the real math
The proprietary-CMS trap is the invisible recurring cost: license, paid modules, captive vendor. Migration is a one-time investment that breaks that rent.
| Line item | Type | 2026 amount |
|---|---|---|
| Full replatforming | One-shot | 10,000 - 28,000 € |
| Content & URL audit | One-shot | 1,200 - 3,500 € |
| 301 redirect plan | One-shot | 800 - 2,500 € |
| Proprietary CMS license | Recurring (saved) | 3,000 - 12,000 €/yr |
| Paid modules / add-ons | Recurring (saved) | 600 - 3,000 €/yr |
| Optimized hosting | Recurring | 300 - 1,080 €/yr |
On a median replatforming budget of 16,000 € and a saved license of 7,000 €/yr, break-even lands between year 2 and year 3, after which every year becomes net savings.
The steps of an SEO-safe migration
SEO isn't lost by magic: it's lost on orphaned URLs, dropped meta tags and forgotten redirects. A controlled schedule neutralizes those risks.
| Step | Deliverable | Timeline |
|---|---|---|
| 1. Content & URL audit | Full inventory, pages to keep | Week 1-2 |
| 2. Target architecture | Sitemap, data schema | Week 2-3 |
| 3. Development & reimport | Front + migrated content | Week 3-9 |
| 4. Redirect plan | Exhaustive, tested 301 table | Week 8-10 |
| 5. SEO & perf QA | Crawl, Lighthouse, fixes | Week 10-12 |
| 6. Go-live | DNS switch, monitoring | Week 12-14 |
Total timeline holds within 8 to 14 weeks depending on volume. The redirect table, tested before switch, is the document that protects organic traffic.
Mini case study
Sophie, digital lead of an industrial SME in Nantes, pays 7,200 €/yr in license for a proprietary CMS that limits her integrations. Replatforming quote: 16,000 €, plus 2,800 € for audit and redirects — 18,800 € one-shot. Annual saving: 7,200 € license + 1,200 € modules = 8,400 €/yr. Break-even at 2 years and 3 months; over 5 years, cumulative net savings top 23,000 €, not counting the performance gain and the end of single-vendor dependence.
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FAQ
Will I lose Google rankings by changing CMS?
Not if URLs are kept or 301-redirected one by one. A well-run migration limits loss to under 5 % of traffic over 4 to 6 weeks, usually recovered afterward.
How long does a full replatforming take?
Between 8 and 14 weeks depending on the number of pages and templates. The initial audit and SEO QA frame development and secure the switch.
What happens to my existing content?
It is exported then reimported into the new CMS, with media and taxonomy cleanup. Content reimport runs 1,200 to 4,000 € depending on volume and data cleanliness.
Is migration worth it if my license is modest?
Below 3,000 €/yr in license, break-even stretches past 4-5 years; the decision is then justified mainly by performance, SEO and autonomy gains rather than savings alone.
Can I migrate without downtime?
Yes: the new site is built in parallel, tested, then put live via a DNS switch in minutes, often off-hours for zero visible impact.
Let's scope your project. Tell us your current CMS, annual license cost and page count; we'll price the replatforming and compute your break-even. 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.
