The verdict in three sentences
The 301 redirect plan is a migration's SEO life insurance: without it, a rebuild can erase 30 to 50% of organic traffic. In Dublin in 2026, a full URL mapping costs 900 to 3,200 EUR depending on URL count, with a 3 to 7 day production timeline. The numeric goal: a traffic loss under 10% across the first four weeks, with 30 days of monitoring after go-live.
Method and pricing by URL volume
Cost tracks directly with the number of URLs to map and mapping complexity (1:1, 1:N, deleted pages redirected to the closest equivalent). We always start from a full crawl + Search Console export + server logs.
| URL volume | Mapping scope | Timeline | Price range |
|---|---|---|---|
| < 100 URLs | Simple 1:1 mapping | 1-2 days | 900-1,300 EUR |
| 100-500 URLs | Mapping + orphan pages | 2-3 days | 1,300-2,100 EUR |
| 500-2,000 URLs | Mapping + regex + consolidation | 3-5 days | 2,100-2,900 EUR |
| > 2,000 URLs | Advanced regex + automated QA | 5-7 days | 2,900-3,200+ EUR |
These 2026 figures include delivery of the redirect file (htaccess, Nginx or Next.js middleware) and an HTTP status code QA pass.
What we monitor after the switch
Migration does not end at go-live. A structured 30-day follow-up catches 404s, redirect chains and ranking drops before they cost revenue.
| Monitored metric | Alert threshold | Tool |
|---|---|---|
| 404 pages | > 2% of URLs | Weekly crawl + logs |
| Redirect chains | > 1 hop | Screaming Frog |
| Organic traffic loss | > 10% at W+2 | Search Console / GA4 |
| Top-20 keyword positions | -3 places | Rank tracking |
| New URL indexing time | > 14 days | Search Console |
| 5xx server errors | > 0.5% | Uptime monitoring |
A well-executed plan sees traffic return to its starting level within 2 to 6 weeks, then exceed it if speed improves.
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Mini case study
Nadia, SEO lead at a B2B publisher in Dublin, migrates a 1,400-URL site generating 45,000 organic visits/month. With no plan, the risk is a 40% loss, i.e. 18,000 visits. She budgets a redirect plan at 2,500 EUR + 30-day monitoring. Result: loss capped at 7% in week two, full recovery by W+4. The 18,000 preserved visits, valued at an equivalent SEA acquisition cost of 0.90 EUR per visit, represent 16,200 EUR of protected traffic every month: the plan pays for itself in the first week.
FAQ
Why 301s and not 302s? The 301 (permanent) passes most of the ranking signal to the new URL; the 302 (temporary) does not do so reliably. For a permanent migration it is always 301.
How long should redirects stay? At least 12 months, ideally permanently. Removing them too early surfaces 404s on old external links still live.
Do I need to redirect every URL individually? Pages with traffic or backlinks: yes, 1:1. The thousands of technical URLs with no value can be grouped via regex to a relevant category.
What is the acceptable loss threshold? Under 10% organic traffic over the first two weeks, with recovery within 6 weeks. Beyond that, audit the mappings and 404s.
Is 30-day monitoring really worth it? Yes: most avoidable losses (redirect chains, residual 404s, unindexed pages) surface between D+3 and D+21. That is the critical window.
Let's scope your project. Tell us your site's URL count and target migration date, and we will price the mapping and 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.
