The verdict in three sentences
Migrating from WordPress to a headless Next.js architecture costs between 22,000 and 55,000 EUR (net) depending on content volume and integrations, over 8 to 12 weeks. The return shows on three axes: performance (LCP often halved), security (no more exposed PHP plugins) and maintenance cost (support reduced by 30 to 50 %). It only pays off if your traffic, content catalogue or security requirements justify the upfront investment.
Cost breakdown by workstream
A headless migration splits into clear workstreams. Here is a 2026 order of magnitude for a London scale-up with 300 to 800 content pages.
| Workstream | Scope | 2026 cost (EUR net) | Timeline |
|---|---|---|---|
| Audit & scoping | Content inventory, data model, redirect plan | 3,000 - 6,000 | 1 - 2 wks |
| Content API (headless CMS) | Sanity/Strapi, schemas, editor roles | 5,000 - 12,000 | 2 - 3 wks |
| Next.js front end | Design system, pages, ISR, i18n | 9,000 - 22,000 | 4 - 6 wks |
| Data migration | Import scripts, media, cleanup | 3,000 - 9,000 | 1 - 2 wks |
| SEO & QA | 301 redirects, testing, go-live | 2,000 - 6,000 | 1 - 2 wks |
| Total | Full project | 22,000 - 55,000 | 8 - 12 wks |
The most variable item is the front end: the richer your animations and interactive components, the higher the envelope.
Measured gains after migration
The benefits are not theoretical. Here are the orders of magnitude seen on comparable 2026 projects.
| Metric | Saturated WordPress | Headless Next.js | Gain |
|---|---|---|---|
| LCP (mobile 4G) | 3.8 s | 2.1 s | -45 % |
| Lighthouse perf score | 52 | 94 | +42 pts |
| Security incidents / yr | 6 - 10 | 1 - 2 | -75 % |
| Monthly maintenance (EUR net) | 900 - 1,500 | 500 - 900 | -40 % |
| Deployment time | 30 - 60 min | 2 - 5 min | -90 % |
| Hosting cost / month | 120 - 300 | 40 - 120 | -55 % |
The drop in security incidents comes from removing the exposed PHP layer and third-party plugins, the main entry point for WordPress attacks.
Mini case study
Thomas, CTO of a SaaS scale-up in London, runs a WordPress with 41 plugins that breaks twice a quarter. His maintenance costs 1,300 EUR (net)/month and his mobile LCP is stuck at 3.9 s, dragging down SEO. He invests 34,000 EUR (net) in a headless Next.js + Sanity migration over 10 weeks. Maintenance drops to 700 EUR (net)/month, saving 7,200 EUR (net) a year, and organic traffic rises 18 % in six months thanks to the performance gain. The investment pays back in a little over two years on maintenance alone, before counting SEO.
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FAQ
How long does a headless migration take in 2026?
Expect 8 to 12 weeks for 300 to 800 pages. An institutional site with several thousand pages may need 4 to 6 months with a phased content migration.
Will I lose my SEO?
Not if the 301 redirect plan is complete. A well-run migration keeps 95 to 100 % of organic traffic; losses almost always come from un-redirected URLs or deleted content.
Will my editors have to relearn everything?
A modern headless CMS (Sanity, Strapi) offers an editing interface close to WordPress. Plan 2 to 4 hours of training; the learning curve for day-to-day publishing is short.
Is headless always worth it?
No. Below a few tens of thousands of visits/month and without strong security or performance needs, a well-optimised WordPress is often enough and cheaper.
What maintenance budget should I plan afterwards?
Between 500 and 900 EUR (net)/month for support covering version upgrades, fixes and small changes, versus 900 to 1,500 EUR (net) for an equivalent WordPress.
Let's scope your project. Share your page volume, integrations and indicative budget, and we'll price your WordPress to headless Next.js migration. 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.
