The verdict in three sentences
For a mid-sized company whose WordPress stacks 38 plugins and monthly security alerts, migrating to Next.js costs between 12,000 and 30,000 EUR excl. VAT (about 13,000 to 33,000 USD) depending on page volume and integrations. The payoff shows quickly: 40 to 60% faster load times, a smaller attack surface and 30% less maintenance from year one. The only real risk, losing SEO traffic, is neutralized with an exhaustive 301 redirect plan and URL testing before cutover.
Why a 38-plugin WordPress becomes a risk for a mid-sized company
Every plugin is a third-party dependency, updated on a schedule you do not control. In 2026, most published WordPress vulnerabilities affect extensions rather than the CMS core. An IT director running a corporate site, a documentation area and quote request forms ends up choosing every month between risky updates and known flaws.
| Indicator (2026 order of magnitude) | WordPress with 38 plugins | Next.js + headless CMS |
|---|---|---|
| Mobile Largest Contentful Paint | 3.5 to 5.5 s | 1.2 to 2.2 s |
| Publicly exposed dependencies | 38 plugins + theme | 0 (static or server-rendered site) |
| Critical security updates per year | 15 to 30 | 2 to 5 (framework and dependencies) |
| Annual maintenance | 6,000 to 10,000 EUR | 4,000 to 7,000 EUR |
| Annual hosting | 600 to 2,400 EUR | 300 to 1,800 EUR |
| Lighthouse performance score | 35 to 60 | 90 to 99 |
Next.js generates static or server-rendered pages. The admin panel is no longer exposed on the public domain: content is entered in a headless CMS (Sanity, Strapi, Payload) and published through an API. That decoupling removes most of the risk.
How much the migration costs by scope
The budget depends mainly on three variables: the number of page templates (not pages), business integrations (CRM, ERP, SSO) and content migration.
| Scope | Pages | 2026 budget excl. VAT | Timeline |
|---|---|---|---|
| Simple corporate site | 50 to 150 | 8,000 to 12,000 EUR | 6 to 8 weeks |
| Standard B2B site + blog | 150 to 250 | 12,000 to 18,000 EUR | 8 to 10 weeks |
| B2B site + docs area + multilingual | 250 to 400 | 18,000 to 30,000 EUR | 10 to 12 weeks |
| CRM integration (HubSpot, Salesforce) | n/a | + 2,000 to 5,000 EUR | + 1 to 2 weeks |
| Automated content migration | n/a | + 1,500 to 4,000 EUR | included |
| 301 redirect plan + SEO testing | n/a | 1,500 to 3,500 EUR | 1 to 2 weeks |
One point often overlooked is content migration. A script that reads the WordPress REST API and pushes posts into the headless CMS costs a few days of development, versus several weeks of manual copy and paste.
Controlling SEO risk: the five-step method
Traffic loss after a migration almost always comes from forgotten URLs. The method has five steps: a full crawl of the existing site (Screaming Frog), export of URLs receiving traffic or links from Search Console, an old-to-new URL mapping table, implementation of 301s in the Next.js configuration, then automated testing that checks every line before go-live.
| Step | Deliverable | Acceptance criterion |
|---|---|---|
| Crawl of the existing site | URL inventory | 100% of indexed URLs listed |
| Mapping table | Old/new URL file | Zero traffic URL without a destination |
| 301 implementation | Redirect file | Single redirect, no chains |
| Pre-production testing | Test report | 0 404 errors on the sample |
| Post-cutover monitoring | 8-week dashboard | Organic traffic within ± 10% at D+30 |
With this method, a temporary 5 to 10% dip in the first two weeks is common, then traffic recovers and grows thanks to the speed gain.
Mini case study
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Daniel, IT director of an aerospace components supplier in New York State, runs a 280-page WordPress with 38 plugins. He pays 8,500 EUR (about 9,300 USD) a year in maintenance and suffered two security incidents in 2025, each billed around 3,000 EUR in emergency work. Annual total: 14,500 EUR.
The Next.js migration is quoted at 22,000 EUR (templates, automated content migration, HubSpot integration, 301 plan). Maintenance drops to 5,900 EUR a year and incident risk becomes marginal. Estimated annual savings: 8,600 EUR, a payback of about 2.5 years, not counting the commercial gain from a site 50% faster on quote requests.
FAQ
How long is the site down during cutover?
No downtime is required. The new site is built in parallel and cutover happens through a DNS change, propagating within minutes to a few hours.
Can we keep WordPress as the back office?
Yes, in headless mode: WordPress is only the editor and Next.js renders the pages. This option cuts the cost by 15 to 20%, but keeps some plugins to maintain.
Will the marketing team need to learn a new tool?
A CMS such as Sanity or Strapi takes half a day of training to master. Budget 600 to 1,200 EUR for a session and an editorial guide.
What happens if traffic drops after migration?
The 8-week post-cutover monitoring spots 404s and fixes redirects within 48 h. Beyond a 10% drop at D+30, a detailed analysis is included in the engagement.
Should we migrate the whole site at once?
Under 400 pages, a single cutover is simpler and cheaper. Beyond that, a migration in 2 or 3 sections limits risk.
Let's scope your project. Send us your WordPress URL and plugin list: we will price the migration, the redirect plan and the go-live timeline. 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.
