The verdict in three sentences
Replatforming from WordPress to a headless Next.js stack costs between 12,000 and 28,000 EUR in 2026, depending on content volume and template complexity. The payoff is not cosmetic: LCP from 3.8 s to 1.2 s, Lighthouse from 55 to 95+, and up to -40 % on annual hosting. The only real risk is SEO, and it is controlled with a rigorous 301 redirect plan and a 90-day Search Console watch.
What the migration actually costs in 2026
Price depends on three variables: the number of templates to rebuild, the volume of articles to migrate and the level of animation expected. A 15-page brochure site is not a 2,000-article media outlet.
| Site profile | Pages / articles | Templates | 2026 budget (EUR) | Timeline |
|---|---|---|---|---|
| SMB brochure | 15-30 | 4-6 | 12,000 - 16,000 | 4-6 wks |
| Corporate site | 40-80 | 8-12 | 16,000 - 22,000 | 6-9 wks |
| Media / dense blog | 500-2,000 | 6-10 | 20,000 - 26,000 | 8-12 wks |
| Headless e-commerce | 100-500 products | 10-15 | 24,000 - 28,000 | 10-14 wks |
| Content migration only | any volume | - | 3,000 - 6,000 | 2-3 wks |
The most underestimated line item is content migration: WordPress export via the REST API, HTML clean-up, media remapping into a headless CMS (Sanity, Strapi or Contentful). Budget 0.8 to 1.5 EUR per automatically reformatted article, more if layouts are hand-crafted.
The performance gains, quantified
Moving to static/SSR rendering on Next.js changes the order of magnitude of Core Web Vitals. Here are typical before/after readings (2026 estimate) on a plugin-heavy WordPress.
| Metric | WordPress + plugins | Next.js headless | Gain |
|---|---|---|---|
| LCP | 3.8 s | 1.2 s | -68 % |
| Mobile Lighthouse | 55 | 95+ | +40 pts |
| Page weight (KB) | 2,400 | 480 | -80 % |
| Time to First Byte | 620 ms | 90 ms (edge) | -85 % |
| Hosting cost / yr | 1,800 EUR | 1,080 EUR | -40 % |
| Server requests / page | 45 | 6 | -87 % |
These gains are not isolated: an LCP cut by three improves conversion rate and crawl budget, and therefore indexing. Hosting drops because a static site is served from an edge CDN (Vercel, Netlify, Cloudflare) instead of an always-on PHP/MySQL server.
301 redirects and SEO risk
This is where success is decided. Every existing URL must point to its new address with a permanent 301, otherwise Google loses the link between the old ranking and the new page.
| SEO task | Action | Risk if ignored |
|---|---|---|
| URL mapping | 1:1 old -> new table | 40-60 % traffic loss |
| 301 redirects | Every URL, incl. media | 404 errors, authority drop |
| Meta / heading tags | Carried over identically | Position regressions |
| XML sitemap | Regenerate + submit to GSC | Slow indexing |
| Before/after crawl | Screaming Frog diff | Invisible orphans |
The golden rule: never change URL structure and stack at the same time without a validated redirect plan. A full crawl before migration is the reference; a crawl after cutover checks that 100 % of URLs return 200 or 301.
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Mini case study
Marc, marketing lead at an industrial SMB in Berlin, runs a 220-page WordPress with a 3.9 s LCP. His migration to Next.js + Sanity is quoted at 18,000 EUR, 8-week timeline. After cutover: LCP at 1.1 s, mobile Lighthouse at 96, and hosting drops from 150 to 90 EUR/month, saving 720 EUR a year. More importantly, organic traffic gains 22 % in 4 months thanks to speed and a better-served crawl. Estimated payback under 20 months combining hosting savings and additional revenue from traffic.
FAQ
How long does a WordPress to Next.js migration take?
Between 4 and 14 weeks in 2026 depending on volume. A 20-page brochure fits in 4-6 weeks; a 2,000-article media site needs 8 to 12 weeks with automated content migration.
Will I lose my SEO?
Not if the 301 redirect plan is complete and tested. A poorly prepared migration can cost -40 to -60 % of traffic; a scoped migration preserves or even improves rankings thanks to speed.
Can I keep my WordPress editing interface?
Yes, in headless mode: WordPress becomes a back-office that exposes its API, and Next.js consumes the content. You keep your editorial habits without the weight of the PHP front-end.
Does hosting really cost less?
Usually -30 to -40 %. A static Next.js site is served from an edge CDN without a permanent PHP/MySQL server, cutting both the bill and incidents.
Do I have to migrate everything at once?
No. You can migrate in batches (blog first, then corporate) as long as redirects stay consistent. It is even recommended for high-volume sites.
Let's scope your project. Give us your page volume, current stack and target timeline: we will quote the Next.js 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.
