The essentials
A poorly prepared redesign can lose 50 to 70% of organic traffic according to Ahrefs and Content Powered, a risk that’s avoidable with a prior SEO audit and a 301 redirect plan. On the budget side, plan for €5,000 for a simple visual refresh to over €100,000 for a complete technical rebuild.
“Redesign” doesn’t mean the same thing to everyone
Your site is five years old, looks dated, performance is poor. You decide to redesign it. But what exactly do you mean by “redesign”? That question alone determines the order of magnitude of the budget: a redesign can range from a simple visual refresh to a complete rebuild of the technical architecture.
The three levels of redesign and their costs
| Level | Budget | Timeline | What changes |
|---|---|---|---|
| Visual redesign | €5,000 - €15,000 | 4-8 weeks | Design, visual identity, mobile optimization. CMS and structure unchanged. |
| Structural redesign | €15,000 - €50,000 | 2-4 months | Information architecture, user journey, deep SEO work, new features. |
| Complete technical rebuild | €50,000 - €100,000+ | 4-8 months | Technology or CMS change, rebuilt back office, complex integrations. |
Structural redesign is the most common: a site that no longer meets current business objectives, without being technically obsolete.
Expenses to anticipate
- Audit and strategy: €2,000 - €8,000 depending on site size. Understanding what works before repeating the current site’s mistakes.
- Design and UX: 20 to 30% of the total budget, i.e. €5,000 - €20,000 depending on the level of customization.
- Development and integration: the core of the budget, highly variable depending on complexity (simple WordPress integration vs custom development).
- Content migration: €1,000 - €10,000, often underestimated.
- SEO and redirects: €2,000 - €8,000, essential to avoid destroying the SEO you’ve already earned.
The 5 mistakes that destroy SEO during a redesign
A site that removed 15% of its pages during a redesign lost nearly 50% of its organic traffic (Ahrefs). A Content Powered study reports drops of 60 to 70% after poorly prepared redesigns. These disasters are avoidable.
1. Skipping the SEO audit before the redesign
Too many businesses remove high-performing pages and change well-ranked URLs without having analyzed what works. The fix: identify your high-performing pages (Analytics, Search Console), list your ranked keywords, map your backlinks, document your current URL structure. Golden rule: never remove a page that generates traffic without a redirect strategy.
2. Forgetting 301 redirects
Changing URLs with no redirect sends your old pages, indexed and shared, straight to 404s. The fix: an exhaustive redirect plan, using 301s (never 302s), with no redirect chains, tested before launch, kept in place for at least a year.
3. Changing the structure with no strategy
Merging categories, reorganizing menus: every change affects internal linking and page authority. The fix: keep pillar pages at a shallow depth (max 3 clicks from the homepage), maintain thematic silos, document the old-to-new mapping.
4. Ignoring technical aspects post-migration
A forgotten noindex tag, a blocking robots.txt, an outdated sitemap, a missing SSL certificate, duplicate content: these mistakes often go unnoticed for weeks. The 48-hour checklist: check robots.txt, verify meta tags, submit the new sitemap, test Core Web Vitals, scan for 404 errors, verify HTTPS.
5. Not planning a monitoring period
A 10-15% dip for a few days is normal after a migration. A drop exceeding 30% or persisting beyond 3 weeks signals a problem that needs urgent fixing.
| Period | Actions |
|---|---|
| Day 1 | Indexing, 404 errors, robots.txt |
| Day 7 | Compare traffic vs the previous week |
| Day 14 | Rankings of main keywords |
| Day 30 | Full review: traffic, conversions, rankings |
| Day 90 | Final assessment, adjustments |
Hidden costs that derail budgets
- Client-side project management: meetings, approvals, content supply, often 20 to 30% of the external cost in internal time.
- Late-stage back-and-forth: every last-minute change costs money. A precise brief upfront avoids surprises.
- Training teams on the new CMS if it changes.
- Post-launch evolutions: a site is never finished, budget for the first months of fixes.
Complete checklist
Before: full SEO audit, list of high-performing pages, keyword and ranking export, backlink inventory, URL mapping, 301 redirect plan.
During: preserve optimized tags, keep high-performing content, maintain the URL structure if possible, implement redirects, test in staging.
After: check robots.txt and meta robots, submit the new sitemap, verify indexing, monitor 404s, track traffic daily for 2 to 4 weeks, analyze Core Web Vitals.
FAQ
How long does the traffic drop last after a redesign?
A 10-15% dip for 1 to 2 weeks is normal, the time it takes Google to re-index the site. Beyond 30% or 3 weeks, there’s likely a technical problem to fix urgently: missing redirects, a blocking robots.txt, or a forgotten noindex tag.
Can you change CMS without losing your SEO?
Yes, provided you keep the URL structure or set up 301 redirects, migrate optimized content, and maintain technical performance. A well-prepared WordPress to Next.js migration can even improve SEO thanks to performance gains.
What budget should I plan for a website redesign?
From €5,000 for a simple visual refresh (design, unchanged CMS) to over €100,000 for a complete technical rebuild with a CMS change and complex integrations. The most common case, structural redesign, falls between €15,000 and €50,000.