The verdict in three sentences
Switching CMS or rebuilding a site is the riskiest moment for your SEO: a botched migration loses 15 to 20% of organic traffic, and sometimes that loss becomes permanent. A controlled migration rests on three pillars — an exhaustive 301 redirect plan, preserving high-equity URLs, and a rigorous 90-day watch. For a Toronto SME, this project costs CAD 2,800 to 7,000 and full traffic recovery takes 6 to 10 weeks when done cleanly.
Pre-migration checklist: what to prepare before switching
Most losses are decided before go-live. Here are the non-negotiable steps and their effort.
| Pre-migration step | Goal | Estimated effort |
|---|---|---|
| Full crawl of the old site | Inventory of all indexed URLs | 0.5 – 1 d |
| Export of positions and traffic | Reference baseline | 0.5 d |
| Old → new URL mapping | 301 redirect plan | 1 – 2 d |
| Freeze high-traffic URLs | Preserve ranking pages | included |
| QA on a staging environment | Verify redirects and tags | 1 d |
| Rollback plan | Safety in case of incident | 0.5 d |
A 301 (permanent) redirect transfers most of the SEO equity; a 302 or a 404 destroys it. That is the difference between an invisible migration and a sharp drop.
Post-migration checklist: the 90-day watch
After the switch, the work continues. Here is the monitoring calendar and alert thresholds.
| Post-migration check | Frequency | Alert threshold |
|---|---|---|
| 404 errors in Search Console | daily (week 1) | > 1% of URLs |
| 301 redirect verification | D+1, D+7 | any 302 or 404 |
| Key rank tracking | weekly | drop > 3 positions |
| Organic traffic vs baseline | weekly | drop > 10% at W+3 |
| Reindexing via sitemap | D+1 | sitemap submitted |
| Broken internal link fixes | ongoing | 0 dead links targeted |
A temporary 5 to 10% dip in the first week is normal: Google re-evaluates the new URLs. Beyond three weeks without recovery, you must audit the redirects.
Mini case study
Megan, marketing lead at a B2B services SME in Toronto, migrates her site from WordPress to a headless CMS. The site generates 25,000 organic visits/month, 30% of which lead to a lead. She orders a scoped migration at CAD 3,800 with a redirect plan and 90-day watch. Result: only a 6% dip in the first week, then full recovery in 7 weeks. A competitor who migrated without a plan lost 18% of traffic for four months. For Megan, avoiding that 18% loss on 25,000 visits preserves 4,500 visits/month, roughly 1,350 leads saved over the critical period — the CAD 3,800 budget is trivial against the risk avoided.
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FAQ
Why do you lose traffic during a migration?
The main causes are missing or misconfigured redirects, unanticipated URL changes, lost tags (title, canonical) and broken internal links. Each sends a bad signal to Google, which temporarily demotes the pages.
Do I need to keep exactly the same URLs?
Ideally you keep high-traffic URLs identical. When a change is unavoidable, a one-to-one 301 redirect to the equivalent page preserves most of the SEO equity.
How long should I keep 301 redirects?
At least a year, ideally permanently. Google takes several months to consolidate new URLs, and old external links will keep pointing to the old addresses for a long time.
Can I migrate without an agency?
Technically yes, but the financial risk is high: losing 18% of traffic for months costs far more than the CAD 2,800 to 7,000 of an engagement. The 90-day watch exists to detect and fix issues quickly.
When do I recover my previous traffic?
With a clean migration, expect 6 to 10 weeks to return to the initial level, often surpassing it if the rebuild also improves performance and content.
Let's scope your project. Tell us your current and target CMS, your organic traffic volume and the planned switch date, and we will frame a zero-loss migration plan. 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.
