The verdict in three sentences
Redesigning a site without a prior audit means gambling with an asset that took years to build: post-migration traffic loss reaches 30-50% when URLs, redirects and strategic content are not preserved. A technical SEO audit (1,500-5,000 EUR, 2-3 weeks) maps what earns, what to keep and what to redirect. It is insurance whose cost rarely exceeds 10% of the redesign budget, avoiding a revenue drop that is counted in tens of thousands of euros.
What a serious audit covers
A credible audit is not a single automated tool report. It cross-references technical crawl, Search Console data, content analysis and backlinks to prioritize. Here are the areas and their typical weight.
| Audited area | What is checked | Budget weight |
|---|---|---|
| Crawl & indexation | 4xx/5xx errors, orphans, robots.txt, sitemap | 20% |
| Architecture & URLs | Depth, internal linking, redirect plan | 20% |
| Core Web Vitals | LCP, INP, CLS on mobile and desktop | 15% |
| Content & keywords | High-traffic pages, cannibalization, gaps | 25% |
| Backlinks | Links to preserve, anchors, authority | 15% |
| Reporting & plan | Prioritization, migration roadmap | 5% |
The key deliverable is not the list of problems but the 301 redirect plan and the list of pages to keep as-is.
2026 pricing by site size
The price depends mainly on the number of URLs to crawl and the depth of content analysis. Ranges are a 2026 order of magnitude.
| Site size | Audit price (EUR) | Timeline | Traffic loss avoided |
|---|---|---|---|
| Brochure < 30 pages | 1,500 - 2,500 | 2 weeks | 20 - 35% |
| Site 30-150 pages | 2,500 - 3,800 | 2 - 3 weeks | 30 - 45% |
| Site 150-800 pages | 3,800 - 5,000 | 3 weeks | 35 - 50% |
| E-commerce/large catalog | 5,000 - 9,000 | 3 - 5 weeks | 40 - 55% |
Measured against organic-channel revenue, the audit pays for itself as soon as it preserves a single month of traffic that would otherwise vanish.
Mini case study
Sophie is head of e-marketing at an industrial software vendor in Grenoble. Her 220-page site generates 45% of leads via Google. Before redesigning she orders a 3,400 EUR audit. It reveals 38 pages holding 71% of organic traffic and a plan of 190 301-redirects. As a result, the migration loses only 6% of traffic instead of the 40% a competitor without an audit suffered. On organic traffic valued at 18,000 EUR of pipeline per month, the audit preserved ≈ 6,100 EUR/month of value: paid back in under three weeks.
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FAQ
How much is a technical SEO audit before a redesign in 2026?
Between 1,500 and 5,000 EUR for a brochure-to-medium site, more for e-commerce. Price depends on URL count and depth of content analysis.
What is the real risk of skipping the audit?
A 30-50% organic traffic loss in the weeks after go-live, often hard to recover before 6-12 months. It is the top cause of a failed redesign.
How long does an audit take?
Expect 2-3 weeks for a standard site, up to 5 weeks for a large catalog. The redirect plan must be ready before going live.
Does the audit replace post-migration monitoring?
No: you must monitor indexation and rankings for 4-8 weeks after launch. Budget 500-1,500 EUR for follow-up.
Isn't an automated tool enough?
A tool detects errors but does not prioritize by your revenue. The value of an audit comes from human analysis that distinguishes pages worth preserving.
Let's scope your project. Share your page count and Search Console access: we will frame an audit and a safe 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.
