The verdict in three sentences
Headless decouples the content back-office from the displayed front end: you keep editing comfort, you gain the performance and security of a static site. Migration costs between 15,000 and 40,000 EUR depending on content volume and integrations, over a 3 to 4 month timeline. ROI plays out on SEO, mobile conversion and a drastic drop in security incidents.
Monolith vs headless: the technical comparison
A classic WordPress renders each page on the fly in PHP, with the database exposed. Headless pre-generates or serves the front via an API, on static hosting (CDN). Here is the 2026 order of magnitude.
| Criterion | WordPress monolith | Headless (Next.js) |
|---|---|---|
| Mobile LCP | 3.8 s | 1.4 s |
| Lighthouse perf score | 45-65 | 90-99 |
| Attack surface | High (PHP + DB exposed) | Reduced (static front) |
| Hosting cost / month | 40-120 EUR | 0-30 EUR (CDN) |
| Editorial autonomy | Total | Total (CMS retained) |
| Migration cost | — | 15,000-40,000 EUR |
| Timeline | — | 3-4 months |
The performance gain isn't cosmetic: an LCP under 1.5 s improves Google ranking and mobile conversion, decisive on slow connections.
What shapes the quote
Three variables swing the price threefold: the content volume to migrate, the number of integrations (payment, CRM, search) and the design level.
| Component | 2026 range (EUR) | Timeline |
|---|---|---|
| Next.js + decoupled CMS setup | 4,000-8,000 | 3-4 wk |
| Content migration (< 200 pages) | 2,500-6,000 | 2-3 wk |
| Content migration (> 1,000 pages) | 8,000-15,000 | 4-6 wk |
| Front-end design overhaul | 4,000-10,000 | 3-5 wk |
| Integrations (CRM, search, e-commerce) | 3,000-9,000 | 2-4 wk |
| QA, SEO & 301 redirects | 2,000-4,000 | 1-2 wk |
The most underestimated item: 301 redirects. A migration without a clean redirect plan drops organic traffic by 20 to 40% for months.
Mini case study
Sophie runs an online media outlet in Lyon (1,400 articles, 250,000 visits/month). Her WordPress crawls at a 3.8 s LCP and suffered 3 security alerts in a year. Headless migration quoted at 32,000 EUR. Result over 6 months: LCP at 1.4 s, +18% pages per session thanks to speed, and hosting down from 110 EUR/month to 25 EUR/month (1,020 EUR saved per year). At an average ad CPM, the traffic gain covers the investment in about 14 months — not counting the security peace of mind.
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FAQ
Do we lose the WordPress editing interface after migration?
No — in a headless approach you can keep WordPress as the back-office CMS (WP in API mode) or move to a modern decoupled CMS. The editorial team keeps a comfortable writing interface.
How long does a headless migration take?
Allow 3 to 4 months for a mid-sized site: 1 month of setup, 1 to 2 months of content migration and integrations, then QA and cutover. Large volumes (> 1,000 pages) add 4 to 6 weeks.
Is SEO preserved?
Yes, if the 301 redirect plan is complete and tags, sitemap and structured data are carried over. This is the critical point: neglect it and traffic drops 20 to 40%.
What hosting for a headless site?
A static front is served via a CDN (Vercel, Netlify or equivalent), often between 0 and 30 EUR/month, versus 40 to 120 EUR for a performant WordPress. The hosting savings fund part of the maintenance.
Is headless suitable for e-commerce?
Yes, particularly so: the fast front improves conversion and the back manages the catalog via API. Budget the top of the range (30,000-40,000 EUR) for a full catalog and checkout funnel.
Let's scope your project. Tell us your content volume, your current integrations and your performance target: we'll cost the migration and the redirect 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.
