The verdict in three sentences
A Core Web Vitals audit for a B2B website, in Singapore or Toulouse, costs EUR 1,800 to 4,500 (about SGD 2,700 to 6,800), and the fixes cost EUR 3,000 to 12,000 depending on technical debt. The goal is to pass on mobile with INP under 200 ms, LCP under 2.5 s and CLS under 0.1, the thresholds Google uses to judge page experience. On the industrial sites we fix, the lift in form conversion rate ranges from 10 to 25%, a 2026 order of magnitude, not a guarantee.
What the audit measures and what it costs
A sales director at an aerospace or precision engineering supplier often finds out by chance: a buyer from a prime contractor checks the site on a phone between meetings, the machining capabilities page takes 5 seconds to load, and the "Request a quote" button jumps just as it is tapped. Search Console shows "Failed" in red on mobile.
| Metric | Google "Good" threshold | Typical value on an industrial site | Usual cause |
|---|---|---|---|
| LCP (main content display) | Under 2.5 s | 4 to 6 s | Uncompressed workshop photos, hero slider |
| INP (responsiveness) | Under 200 ms | 350 to 600 ms | Theme JavaScript, plugins, chat, marketing tags |
| CLS (visual stability) | Under 0.1 | 0.2 to 0.4 | Cookie banner, fonts, images without dimensions |
| TTFB (server response) | Under 800 ms | 1.2 to 2 s | Shared hosting, no cache |
| Mobile page weight | Under 1.5 MB | 4 to 9 MB | Videos, embedded certification PDFs |
| Package | Content | 2026 price (EUR) | Timeline |
| Quick audit | 5 key pages, prioritised report | 1,800 to 2,400 | 1 week |
| Full audit | All templates, CrUX field data, costed action plan | 3,000 to 4,500 | 2 weeks |
| Light fixes | Images, fonts, cache, CLS | 3,000 to 5,000 | 2 to 3 weeks |
| Heavy fixes | Theme rebuild, plugin removal, server rendering | 7,000 to 12,000 | 4 to 6 weeks |
| Quarterly monitoring | CrUX tracking, alerts, regressions | 400 to 900 per quarter | Ongoing |
Audit only or audit plus fixes
Many companies buy an audit and leave the report in a drawer for lack of technical resources. The real question is not the audit price but who applies the fixes.
| Criterion | Audit only | Audit plus fixes |
|---|---|---|
| Total budget | EUR 1,800 to 4,500 | EUR 4,800 to 16,500 |
| Fixes completed after 3 months | 20 to 40% on average | 90 to 100% |
| Core Web Vitals turning green | Rare without an in-house team | Contractual target |
| Regression risk | High | Managed by tests and monitoring |
| Time to visible result in CrUX | Uncertain | 6 to 10 weeks |
| Best fit | Company with an in-house developer | Industrial SME without a web team |
Google measures Core Web Vitals over a rolling 28 days of real visits: a fix shipped today only fully shows in Search Console a month later.
Mini case study
Thomas, sales director of a 120-employee aerospace supplier, receives 30 quote requests a month through the site, 60% on mobile. The conversion rate to orders is 10%, with an average order of EUR 18,000 and a 22% margin. He orders a full audit at EUR 3,500 and heavy fixes at EUR 8,500, a total of EUR 12,000.
Three months later, INP has dropped from 480 to 160 ms and CLS from 0.28 to 0.04. With a conservative 12% lift in form submissions, he gains 3.6 requests a month, or 0.36 orders and about EUR 1,425 of monthly margin. The project pays back in just over 8 months, before counting the ranking gain on mobile searches.
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FAQ
How much does a Core Web Vitals audit cost?
Expect EUR 1,800 to 2,400 for a quick audit of 5 key pages, and EUR 3,000 to 4,500 for a full audit of all templates with a costed action plan.
What is INP and why target 200 ms?
INP measures the delay between a tap or click and the page's visible response. Above 200 ms Google rates the experience as needing improvement, and above 500 ms as poor.
Do the fixes really improve conversions?
On industrial B2B sites we see 10 to 25% more form submissions after turning green, mostly on mobile. The effect also depends on page quality and is never guaranteed.
Do we need to rebuild the whole site?
Not necessarily: 60% of sites turn green with EUR 3,000 to 5,000 of targeted fixes. A rebuild is justified when the theme or page builder keeps INP above 400 ms.
How long before we see results?
Lab measurements improve as soon as fixes ship. Search Console field data needs 28 days, so 6 to 10 weeks in total.
Let's scope your project. Send us your site URL and your monthly quote request volume: we will price an audit between EUR 1,800 and 4,500 and, if needed, fixes between EUR 3,000 and 12,000. 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.
