The verdict in three sentences
A serious technical SEO overhaul for a B2B site costs between 4,500 and 13,000 EUR in Dublin in 2026, depending on audit depth and the number of URLs involved. The bulk of the budget goes into Core Web Vitals fixes (LCP under 2.5 s) and a thorough 301 redirect map that protects your hard-won rankings. Skipping this work risks a 30 to 50 % organic traffic loss after migration, far more expensive than the project itself.
What a technical SEO overhaul covers
A technical overhaul is not a redesign. It targets the invisible layer that decides your ranking: speed, indexability, URL structure, internal linking, structured data. Here are the line items and 2026 ranges on the Dublin market.
| Line item | Detail | Range (EUR) |
|---|---|---|
| Full technical SEO audit | Crawl, logs, indexation, Search Console | 1,400 - 3,300 |
| Core Web Vitals fixes | LCP, INP, CLS | 1,700 - 4,300 |
| 301 redirect map | Old-to-new URL mapping | 700 - 2,200 |
| Structured data (JSON-LD) | Organization, Product, FAQ | 600 - 1,600 |
| Internal linking optimisation | Topic clusters | 900 - 2,700 |
| Post-migration monitoring (1 mo.) | Rankings and error tracking | 700 - 1,700 |
A SaaS firm with 150 URLs and a blog stays at the low end. A 5,000-SKU B2B store climbs quickly toward the top.
The hidden cost of a ranking drop
The real stake is not the quote, it is what you lose by doing nothing or migrating badly. Take a site generating 8,000 organic visits a month, a 2 % conversion rate and an average order of 900 EUR.
| Scenario | Monthly traffic | Leads/month | Monthly revenue lost |
|---|---|---|---|
| Stable rankings | 8,000 | 160 | 0 EUR |
| -20 % after migration | 6,400 | 128 | 28,800 EUR |
| -40 % after migration | 4,800 | 96 | 57,600 EUR |
| Recovery at 6 weeks | 7,600 | 152 | 7,200 EUR (cumulative) |
An 8,000 EUR overhaul is trivial against 57,600 EUR of revenue evaporating in a single month of uncontrolled decline.
Mini case study
Sarah, marketing director at a Dublin electronic-components firm, migrates to a new CMS with no redirect plan. Within three weeks organic traffic falls from 9,200 to 5,100 visits. She commissions an emergency audit at 3,000 EUR, a map of 340 301 redirects at 1,500 EUR and Core Web Vitals fixes at 3,400 EUR, totalling 7,900 EUR. Six weeks later traffic is back at 8,800 visits. Set against the 45,000 EUR of revenue she would have lost, the payback is immediate.
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FAQ
How long does a technical SEO overhaul take?
Expect 4 to 6 weeks from initial audit to go-live, plus a month of monitoring. Sites above 2,000 URLs can take 8 weeks.
Is monthly monitoring mandatory?
Strongly advised for at least 3 months. Monitoring at 700-1,700 EUR/month catches 404 errors, ranking drops and indexation issues before they get expensive.
Can we keep our current design?
Yes. A technical overhaul can run at constant design: code, speed and structure are optimised without touching your visual identity, cutting the budget by 20 to 30 %.
What costs the most?
Core Web Vitals fixes on a heavy site (often 1,700 to 4,300 EUR) and redirect mapping when the site architecture changes deeply.
How do we measure success?
Key rankings recovered within 6 weeks, LCP under 2.5 s, zero 404s on strategic URLs and organic traffic held within ±5 %.
Let's scope your project. Share your URL count, current CMS and migration deadline, and we will price the audit, redirects and Core Web Vitals work in one clear budget. 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.
