The verdict in three sentences
An SEO migration is not a simple file transfer: it is a full project with exhaustive mapping, pre-production QA and 90-day monitoring. For EUR 2,500 to 5,000, a rigorous method keeps transitional traffic loss under 5 % and returns to the starting level within 4 to 8 weeks. Botching this step risks -30 to -50 % traffic and months of recovery.
The five-step method
A migration is won before launch. The order of operations is non-negotiable: freeze the existing site, map, redirect, run QA, then monitor.
| Step | Key action | Milestone | Duration |
|---|---|---|---|
| 1. Content freeze | Lock URLs, titles, high-traffic content | Baseline validated | 2-3 days |
| 2. 301 mapping | Old URL -> new URL table | 100 % of traffic URLs covered | 3-5 days |
| 3. Pre-prod QA | Check redirects, tags, sitemaps | 0 404/500 errors | 2-4 days |
| 4. Go live | DNS switch, sitemap submission | Indexation started | 1 day |
| 5. 90-day monitoring | Track rankings, 404s, indexation | Return to starting level | 90 days |
The core of the setup remains the 301 mapping: every URL receiving organic traffic or holding backlinks must redirect to its closest equivalent, in a single redirect, with no loop or chain.
Budget and price drivers
Migration price depends on URL volume, structure complexity and the level of post-launch monitoring required.
| Service | URL volume | Indicative price | Monitoring included |
|---|---|---|---|
| Essential migration | < 300 | EUR 2,500 | 30 days |
| Standard migration | 300-2,000 | EUR 3,800 | 60 days |
| Complex migration | > 2,000 | EUR 5,000 | 90 days |
| SEO QA only | any volume | EUR 1,200 | no |
| Redirect plan only | any volume | EUR 900 | no |
A 90-day monitoring window is strongly recommended for high-traffic sites: it is the period during which Google re-indexes and any losses become visible and fixable.
Mini case study
Karim, owner of a B2B e-commerce business in Toronto, makes 45 % of revenue via organic search, i.e. EUR 180,000/year of SEO-attributable revenue. He invests EUR 3,800 in a standard migration with 60-day monitoring. Thanks to the exhaustive mapping, his transitional loss is limited to 4 % over 3 weeks, quickly recovered. A botched migration at -35 % over 3 months would have cost him roughly EUR 15,750 in organic revenue (35 % of EUR 45,000 quarterly). The gap between the two scenarios pays for the service more than fourfold.
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FAQ
How much does a loss-free SEO migration cost in 2026?
From EUR 2,500 for a small site to EUR 5,000 for a complex site over 2,000 URLs with 90-day monitoring.
What traffic loss is acceptable?
A transitional loss under 5 % over 2 to 4 weeks is normal and expected. Beyond 15 %, an urgent analysis must be triggered.
How long to recover the initial traffic?
Usually 4 to 8 weeks if the mapping is exhaustive. Very large sites may need up to 12 weeks for full re-indexation.
Is the 301 mapping really essential?
Yes, it is the most critical element. Without it, every old URL returns a 404 and instantly loses its traffic and backlinks.
Should I keep the old and new sites running in parallel?
No. Switch over once after validated QA, then monitor. Two accessible versions create duplicate content harmful to SEO.
Let's scope your project. Tell us your URL volume and the share of organic traffic in your revenue, and we will frame the migration. 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.
