The verdict in three sentences
Changing URLs, domain or CMS with no plan can cut traffic by 20 to 50 % within weeks. The remedy is the 301 redirect (permanent), which transfers 90 to 99 % of SEO equity from the old page to the new one. Everything rests on an exhaustive old -> new URL map, an up-to-date sitemap and Search Console monitoring: a successful migration is about method, not luck.
301 vs other redirects
Not all redirects are equal for SEO. 2026 comparison.
| Type | Meaning | SEO equity transfer | Recommended use |
|---|---|---|---|
| 301 | permanent | 90 - 99 % | definitive URL change |
| 302 | temporary | partial / unstable | test, short promo |
| 307 | temporary (HTTP/1.1) | partial | short technical redirect |
| 404 | not found | 0 % | avoid on traffic pages |
| 410 | permanently gone | 0 % | intentional removal |
| Redirect chain | A->B->C | cumulative loss | flatten to A->C |
The golden rule: one direct 301 per URL. Chains (A->B->C) dilute equity and slow crawling; flatten them to the final destination.
SEO migration checklist with no loss
The steps you must not skip to protect traffic (2026).
| Step | Action | Why |
|---|---|---|
| 1. Inventory | export all URLs (crawl + sitemap + GSC) | miss nothing |
| 2. Mapping | match each old URL to a new one | basis for 301s |
| 3. 301 redirects | set rules before going live | transfer equity |
| 4. Sitemap | generate the new sitemap.xml | guide the crawl |
| 5. Internal links | update to the new URLs | avoid hops |
| 6. Search Console | submit sitemap + track coverage | catch 404s |
| 7. 30-90 day monitoring | watch traffic and errors | fix fast |
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Keep the 301s active for at least 6 to 12 months: Google needs time to recrawl and consolidate signals toward the new URLs.
Mini case study
A Dakar store gets 8,000 visits/month and changes domain. With no plan it loses 35 % of traffic, i.e. 2,800 visits/month evaporated for weeks. With a full 301 map and a submitted sitemap, the loss is limited to a temporary 3-5 %, recovered in 4 to 6 weeks. At a 1.5 % conversion rate and a 30,000 FCFA basket, avoiding the 2,800-visit drop preserves ~1,260,000 FCFA of monthly revenue.
FAQ
How much traffic can you lose without a migration plan? From 20 to 50 % depending on the scope (URL, domain, CMS). With well-set 301s, the loss is limited to a temporary few percent, recovered in 4 to 8 weeks.
Should I use 301 or 302? 301 (permanent) for any definitive change: it transfers 90 to 99 % of SEO equity. 302 is temporary and does not durably consolidate signals; use it only for short cases.
What about redirect chains? Flatten them: a chain A->B->C dilutes equity and slows the crawl. Redirect directly A->C to preserve maximum SEO value.
How long should I keep redirects? At least 6 to 12 months, while Google recrawls and consolidates. Removing 301s too early reintroduces 404s and wastes the migration's benefit.
Let's talk about your project. We plan your migration with a full 301 map for zero traffic loss. 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.
