The verdict in three sentences
In 2026, a site redesign without a redirect plan loses 20 to 60% of organic traffic; with a rigorous 301 redirect plan, the loss stays under 5% and clears within a few weeks. The project costs 1,500 to 4,000 EUR depending on URL count, and requires 2 to 4 weeks of follow-up after migration (404s, Search Console, control crawl). Traffic stabilises in 6 to 10 weeks when the URL-to-URL mapping is complete.
What a redirect plan costs by size
The price depends directly on the number of URLs to map and the complexity of the old architecture. Here are the 2026 orders of magnitude.
| Site size | URL count | Plan cost (EUR) | Project duration | Follow-up included |
|---|---|---|---|---|
| Brochure | < 50 | 1,500 - 2,000 | 3-5 days | 2 weeks |
| SME | 50 - 300 | 2,000 - 3,000 | 1-2 weeks | 3 weeks |
| Rich site | 300 - 1,000 | 3,000 - 4,000 | 2-3 weeks | 4 weeks |
| E-commerce/portal | > 1,000 | 4,000+ | 3-4 weeks | 4-6 weeks |
A sloppy plan that "redirects everything to the home page" is the worst scenario: Google treats these as soft 404s and the loss climbs to 40-60%.
Traffic loss: with vs without a plan
The gap between a controlled migration and an improvised one is brutal. Here is the typical impact.
| Item | Without plan | With full 301 plan |
|---|---|---|
| Traffic loss at day 30 | 20-60% | < 5% |
| URLs returning 404 | 15-40% | < 1% |
| Recovery time | 4-9 months | 6-10 weeks |
| Positions lost | Often permanent | 95% recovered |
| Recovery cost | 3,000-10,000 EUR | Included in follow-up |
Saving 2,000 EUR on the redirect plan can cost 10,000 EUR in recovery and six months of traffic — a very bad trade.
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Mini case study
Mark, web manager of a B2B distributor in Toronto, migrates a site of 420 URLs generating 12,000 organic visits/month (estimated value: 6,000 EUR/month in paid-search equivalent). He invests 3,200 EUR in a full redirect plan. Without one, a 40% loss would have cost him 4,800 visits/month for 6 months, i.e. ~14,400 EUR of vanished traffic. With the plan, his loss is limited to 4% cleared in 8 weeks: he preserves roughly 13,000 EUR of value for 3,200 EUR invested, a 4x ROI.
FAQ
What is a URL-to-URL mapping? It is the line-by-line correspondence between each old URL and its relevant new destination. Every important page points to its thematic equivalent, never to the home page by default.
When should redirects go live? On the day of go-live, without delay. Any URL left as a 404 even for 48 h sends a bad signal to Google and wastes crawl budget.
How long to recover traffic? With a full plan, expect 6 to 10 weeks to stabilise. Without one, recovery can take 4 to 9 months, and some positions never return.
Should I notify Google of the migration? Yes: submit the new sitemaps in Search Console, monitor the coverage report and use the change-of-address tool if the domain changes. A post-migration control crawl catches missed redirects.
Can I migrate in stages to limit risk? Yes, a staged migration by section (blog, then catalogue, then service pages) reduces risk on large sites. Each batch has its own mapping and follow-up window.
Let's scope your project. Send us your URL count, target platform and go-live date: we build a costed 301 redirect plan with a follow-up window. 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.
