The verdict in three sentences
A WordPress to headless migration in 2026 runs between 15,000 and 40,000 EUR depending on content volume and integration depth. The core gain is not cosmetic: performance (LCP -40 %), security (no more plugin CVEs) and maintenance cost (-20 %). The financial break-even lands around 18 to 24 months, as soon as WordPress maintenance exceeds 800 EUR/month.
Classic WordPress vs headless architecture
The debate is not ideological: it is accounting and operations. Here are 2026 orders of magnitude for a corporate site of 150 to 400 pages.
| Criterion | Classic WordPress | Headless (Next.js + CMS) |
|---|---|---|
| Initial build cost | 8,000-20,000 EUR | 15,000-40,000 EUR |
| Average LCP (mobile) | 3.2-4.5 s | 1.4-2.2 s |
| Monthly maintenance | 600-1,200 EUR | 400-900 EUR |
| CMS license | 0 EUR (open source) | 0-500 EUR/month |
| Plugin-related flaws | 15-40 CVE/year | near zero |
| Deployment time | 10-30 min | 1-3 min (CI/CD) |
| Hosting cost | 40-150 EUR/month | 20-90 EUR/month (edge) |
The headless premium (often +5,000 to +12,000 EUR) pays back through lower maintenance, the end of emergency security patches, and no heavy re-build every three years.
What actually makes up the quote
A serious headless migration quote always breaks out these line items. Beware a single undetailed lump sum.
| Line item | 2026 range | Detail |
|---|---|---|
| Scoping + architecture | 2,500-5,000 EUR | content schema, CMS choice |
| Next.js front-end build | 7,000-18,000 EUR | components, pages, i18n |
| Headless CMS integration | 2,000-6,000 EUR | models, roles, preview |
| Content migration | 1,500-6,000 EUR | 150-400 pages, media |
| 301 redirects + SEO | 1,000-3,000 EUR | mapping plan |
| QA + go-live | 1,500-4,000 EUR | testing, cutover |
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Mini case study
Thomas, IT director of a 90-person industrial SME in Nantes, runs a 220-page WordPress with 34 plugins. His annual maintenance hits 11,400 EUR (950 EUR/month), plus two emergency security fixes at 1,800 EUR. He migrates to Next.js + a headless CMS for 28,000 EUR. His new maintenance drops to 620 EUR/month, or 7,440 EUR/year. Annual saving: 3,960 EUR of maintenance + ~3,600 EUR of avoided incidents = 7,560 EUR. The project pays back in 3.7 years excluding sales gains, but within 20 months once you factor the conversion lift from LCP moving from 3.8 s to 1.7 s.
FAQ
Migrate all at once or gradually? For a site under 300 pages, a full cutover is cheaper (less double-running). Above that, migrating by section over 2 to 3 months limits risk, with a 10-15 % coordination premium.
Does SEO suffer from a headless migration? No, if the 301 redirect plan is complete and URLs are preserved. A poorly prepared migration can cost 20 to 40 % of organic traffic for 2 to 4 months.
Can we keep the WordPress editor as back-office? Yes: WordPress can act as a headless CMS via its REST/GraphQL API. That reduces change management, at an integration cost of 2,000 to 4,000 EUR.
Realistic timeline for 200 pages? Expect 8 to 14 weeks: 2 weeks scoping, 5 to 8 development, 1 to 2 content migration, and 1 to 2 QA and cutover.
Do we need a paid CMS? Not necessarily. Free headless CMSs exist; managed offers (0-500 EUR/month) add content hosting, advanced roles and support.
Let's scope your project. Share your page count, critical plugins and deadline, and we will frame the scope and an indicative budget between 15,000 and 40,000 EUR. 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.
