The verdict in three sentences
Migrating an ageing WordPress to a headless architecture (Next.js + a CMS like Sanity, Strapi or Contentful) costs 15,000 to 40,000 EUR in 2026 depending on scope. Well executed with a rigorous 301 redirect plan, organic traffic loss stays under 10% and recovers within 2 to 3 months. The payoff: +40% performance, a reduced attack surface, and a maintenance bill cut in half.
Why go headless
Monolithic WordPress piles up plugins, a heavy theme and a MySQL database hit on every request. Headless separates content management (the CMS API) from rendering (an ultra-fast static/SSR front end). You gain speed, security (no more exposed PHP surface) and multi-channel flexibility (site + app + screens).
The flip side: it's a development project, not a simple update. You have to rebuild the front end, model the content, migrate the existing data and secure SEO. Here are the 2026 line items.
| Migration item | 2026 cost (EUR) | Detail |
|---|---|---|
| Architecture + content modeling | 3,000 - 7,000 | Schemas, types, governance |
| Front-end development (Next.js) | 8,000 - 20,000 | Pages, components, SSR/ISR |
| Content migration + DB import | 3,000 - 9,000 | Import scripts, media |
| 301 redirect plan | 1,500 - 4,000 | URL mapping, tests |
| SEO QA + structured data | 1,500 - 4,000 | Tags, sitemap, hreflang |
| Editor training | 800 - 2,000 | Headless CMS |
Timelines, hosting and SEO risk
The #1 migration risk is losing rankings if URLs change without clean redirects. An exhaustive 301 mapping, an up-to-date sitemap and Search Console monitoring limit the damage. Hosting a headless front (Vercel, Netlify or a managed VPS) is far lighter than heavy shared WordPress.
| Element | 2026 range | Timeline / cadence |
|---|---|---|
| Full migration (mid-size B2B site) | 15,000 - 40,000 EUR | 8 - 14 weeks |
| Front hosting (Vercel/Netlify) | 50 - 250 EUR/month | Ongoing |
| Headless CMS SaaS (Sanity/Contentful) | 0 - 300 EUR/month | Ongoing |
| Post-migration SEO monitoring | 400 - 1,200 EUR/month | 3 months recommended |
| Traffic loss if well executed | < 10% | Recovered in 2-3 months |
| Performance gain (LCP) | +40% | Immediate |
Mini case study
Camille, digital lead at a software vendor in Berlin, runs a 220-page WordPress hit three times by intrusion attempts in a year. She migrates for 26,000 EUR (dev + migration + 301 plan) to Next.js + Sanity. Maintenance drops from 420 EUR/month (premium plugins, security, patches) to 180 EUR/month for hosting and CMS. Annual saving: 2,880 EUR, plus the end of security incidents. With LCP down from 3.8s to 1.9s and traffic recovered to 96% in ten weeks, the investment is justified over three years on maintenance and conversion effect alone.
FAQ
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Will I lose my rankings by migrating?
Not if the 301 redirect plan is complete: loss stays under 10% and recovers in 2 to 3 months. A botched migration, however, can cost 20 to 40% of traffic long term.
How long does a headless migration take?
Between 8 and 14 weeks for a mid-size B2B site, depending on content volume and front-end complexity. Content migration and SEO QA are the most time-consuming phases.
Is headless more expensive to maintain?
Quite the opposite: hosting (50-250 EUR/month) and the SaaS CMS (0-300 EUR/month) often cost less than premium plugins and securing a heavy WordPress.
Can I keep WordPress as the back office?
Yes, in "headless WordPress" mode: WordPress serves as the content API and Next.js handles rendering. That's an intermediate option at 12,000-20,000 EUR that limits editor retraining.
What concrete performance gain?
2026 projects show LCP improved by 30 to 50% and TTFB halved, which improves both ranking and conversion rate.
Let's scope your project. Send the page count, your current stack and your editorial constraints: we quote the migration, content transfer and 301 plan with a preserved-traffic target. 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.
