The verdict in three sentences
In 2026, a clean HTTPS/HSTS migration costs EUR 1,000 to 4,000 excl. tax and takes 1 to 2 weeks, including certificate, 301 redirects, mixed content and sitemap. Done well, it is a confirmed trust and ranking factor; done badly, it drops organic traffic by 15 to 40 % through 404s, mixed content and redirect chains. The risk is not HTTPS itself, but poor handling of URLs and links.
What a successful HTTPS migration covers
Going HTTPS is not just installing a certificate. You must redirect every old URL, fix resources loaded over HTTP, update canonicals and notify Google. Here is the scope and its 2026 cost.
| Item | What is done | Indicative cost excl. tax |
|---|---|---|
| SSL/TLS certificate | Let's Encrypt or EV, installation | EUR 0 to 400 |
| 301 redirects | HTTP to HTTPS mapping, no chains | EUR 400 to 1,200 |
| Mixed content | Fix images, JS, CSS loaded over HTTP | EUR 300 to 900 |
| HSTS + security headers | HSTS, basic CSP, preload | EUR 200 to 600 |
| Canonicals + sitemap | Update, resubmit to Search Console | EUR 200 to 500 |
| QA & 30-day monitoring | Check 404s, indexing, traffic | EUR 300 to 800 |
On a site with over 500 URLs or multilingual, the range rises toward EUR 3,000 to 4,000 due to the volume of redirects to map.
The mistakes that drop traffic
Most post-migration traffic drops come from three avoidable mistakes. A before/after audit and 30 days of monitoring catch them before rankings degrade for good.
| Mistake | Symptom | Traffic impact | Fix |
|---|---|---|---|
| No 301 redirect | Mass 404s | -20 to 40 % | Full URL mapping |
| Redirect chains | Slowness, wasted crawl | -5 to 15 % | Redirect in 1 hop |
| Mixed content | Broken padlock, warnings | -trust | Force HTTPS everywhere |
| Canonicals on HTTP | Duplicate signals | -10 to 20 % | Rewrite to HTTPS |
| Sitemap not resubmitted | Slow indexing | 2 to 6 wk delay | Resubmit to Search Console |
The cost of a failed migration is not redoing it: it is the traffic and leads lost during the weeks Google reindexes a broken site.
Mini case study
Sophie, digital manager of an industrial SME in Lyon, migrates a 1,200-URL B2B catalogue to HTTPS. Her organic traffic generates about 90 leads/month at an estimated acquisition cost of EUR 35 per lead. A botched migration losing 25 % of traffic would therefore cost about 22 leads/month, i.e. EUR 770 of lost value each month, before counting revenue.
She chooses a scoped migration at EUR 3,200 excl. tax with full mapping and 30-day monitoring. Zero residual 404s, stable indexing in 3 weeks, and a slight ranking lift on product pages. The investment compares to the EUR 9,240 annual lead value a failed migration would have destroyed: the careful version pays back in under 5 months of protected traffic.
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FAQ
Does HTTPS really improve rankings?
Yes, it is a ranking factor confirmed by Google for years, and a trust signal for visitors. The direct effect is modest, but the absence of HTTPS strongly penalises B2B conversion.
How long does an HTTPS migration take?
From 1 to 2 weeks for a standard site, including several days of QA and monitoring. A site with over 500 URLs needs more time to map every redirect without missing any.
What is mixed content and why is it serious?
It is when an HTTPS page loads resources over HTTP (images, scripts). The browser shows a security warning, breaks the padlock and may block elements, degrading trust and display.
Should I enable HSTS immediately?
Enable HSTS once the migration is verified, with a short duration at first. HSTS preload is powerful but hard to reverse; only enable it after confirming the whole site works over HTTPS.
What should I monitor after the migration?
404s, indexing in Search Console, speed and traffic evolution over 30 days. Active monitoring lets you fix a forgotten redirect before it costs rankings.
Let's scope your project. Tell us your URL count, your CMS and whether the site is multilingual: we quote an HTTPS migration with mapping and 30-day monitoring. 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.
