The verdict in three sentences
Migrating a 220-URL site in Dublin without breaking SEO costs EUR 5,000 to 12,000 for the rebuild, plus EUR 1,500 to 3,500 for a rigorous 301 redirect plan. The risk isn't the rebuild but the oversight: a single un-redirected category can wipe out 15% of traffic. With a tight plan, loss tolerance stays under 5% and recovers in 6 to 10 weeks.
Where SEO gets lost during a migration
A migration rarely fails by bad luck: it fails from missing mapping. Losses come from un-redirected URLs, overwritten title/meta tags, forgotten structured data, broken internal linking and an outdated sitemap. In Dublin as anywhere, redirect-plan discipline delivers 80% of the outcome.
| Migration item | Budget (EUR) | Timeline | Risk if neglected |
|---|---|---|---|
| Crawl + 220-URL mapping | 800 - 1,800 | 3 - 5 d | Total loss of orphan pages |
| 301 redirect plan | 1,500 - 3,500 | 4 - 7 d | -15 to -40% traffic |
| Technical + content rebuild | 5,000 - 12,000 | 3 - 5 wk | Core Web Vitals regression |
| Pre-launch SEO QA | included | 2 - 4 d | 404 errors in production |
| 3-month post-migration monitoring | 1,000 - 2,400 | 90 d | Undetected drift |
The realistic total for 220 URLs in Dublin is around EUR 10,000 all-in, monitoring included.
Dublin vs Strasbourg comparison (2026)
An equivalent migration in Strasbourg is budgeted at EUR 3,500-9,000, thanks to lower day rates and less agency demand. The technical scope is identical.
| Item | Dublin (EUR) | Strasbourg (EUR excl. tax) |
|---|---|---|
| 220-URL rebuild | 5,000 - 12,000 | 3,500 - 9,000 |
| 301 redirect plan | 1,500 - 3,500 | 900 - 2,600 |
| Overall timeline | 5 - 9 wk | 4 - 7 wk |
| Traffic-loss tolerance | < 5% | < 5% |
| Monitoring included | 3 months | 3 months |
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Mini case study
Sophie, marketing director at a B2B software vendor in Dublin, rebuilds a 220-URL site drawing 60,000 visits/month. She budgets EUR 10,000 with a redirect plan and monitoring. Without a rigorous plan, missing 20 high-traffic URLs would have cost about 9,000 visits/month (-15%); at 2% conversion and a EUR 320 B2B order, that's EUR 57,600 revenue at risk per month. Thanks to the 301 plan and monitoring, real loss caps at 2.8% and clears in 7 weeks. The migration cost is covered by the avoided risk alone in month one.
FAQ
How long does a no-loss migration take? From 5 to 9 weeks for 220 URLs in Dublin, with 3-5 weeks of rebuild and 1-2 weeks of QA/redirects. Monitoring covers the next 3 months.
Is a 301 redirect enough to preserve SEO? It's the foundation, not everything. You must also keep title/meta, structured data, internal linking and update the sitemap. A 301 to a non-equivalent page loses "link juice".
What traffic loss is acceptable? A temporary 3-5% dip is normal during re-indexing. Beyond 10%, there's a plan or execution problem to fix fast.
Migrate all at once or in batches? For 220 URLs, a well-prepared big-bang is safer than a batch migration that multiplies intermediate states. Very large sites (5,000+ URLs) prefer batches.
Is monitoring really necessary? Yes. 40% of post-migration SEO drift shows up between weeks 2 and 6 (residual 404s, ranking drops). Without watching, you catch them too late.
Let's scope your project. Tell us your URL count, current and target CMS, and launch date: we'll quote rebuild + 301 plan + monitoring. 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.
