WordPress to Headless CMS Migration: Cost and Method in Amsterdam (2026)

The verdict in three sentences

Migrating from WordPress to a headless CMS (Next.js + Sanity or Contentful) costs between 12,000 and 35,000 EUR net in 2026, depending on content volume and integrations. The main gain is not aesthetic: it is a 60 to 80 % reduction in plugin-related security incidents and markedly better performance. The critical part of the project is the 301 redirect plan: done well it preserves SEO; done poorly it can cost 20 to 40 % of traffic.

WordPress vs headless: the comparison that matters

A CTO reasons in total cost of ownership (TCO) and risk, not just build price. Here is the comparison on the decisive criteria, as a 2026 order of magnitude.

Over three years, headless often costs less despite a higher initial build, because hosting, security maintenance and incident fixes drop sharply.

The 6-step migration method

A successful migration follows a strict sequence to preserve earned rankings. Here is the typical flow and associated timelines.

Total timeline is 8 to 14 weeks. Editor training (2 to 3 days) is essential so internal teams use the new back-office without returning to the agency.

Mini case study

Thomas, CTO of an Amsterdam industrial company (450 employees), runs a 280-page WordPress that suffers on average 11 security incidents a year, two of which caused downtime billed at 5,000 EUR in emergency work. He migrates to Next.js + Sanity for 24,000 EUR net. After migration, incidents fall to 2 a year, hosting drops from 90 to 30 EUR/month (720 EUR/year saved) and the Lighthouse score climbs from 52 to 95. Over 3 years he estimates the combined security + hosting + editorial productivity saving at around 28,000 EUR, covering the entire migration cost.

FAQ

Will the migration hurt my rankings?

Not if the 301 redirect plan is complete and tested: every old URL must point to its equivalent. A poorly prepared migration, however, can cost 20 to 40 % of organic traffic.

How long does a headless migration take in 2026?

Expect 8 to 14 weeks depending on content volume and integrations, with the content rework and redirect steps often underestimated.

Is headless harder for my teams to administer?

No, modern CMSs (Sanity, Contentful) offer an intuitive editing interface; 2 to 3 days of training is usually enough to make teams autonomous.

Why is headless safer than WordPress?

Because it removes dependence on third-party plugins, the main source of vulnerabilities: incidents typically fall from 8-15/year to 1-3/year.

Is the cost justified versus an optimised WordPress?

Over three years, headless TCO (30,000-45,000 EUR) is often lower than WordPress TCO (45,000-70,000 EUR) thanks to security and hosting savings.

Let's scope your project. Send us your page volume, current CMS and integrations: we quote the migration (12,000 to 35,000 EUR net) and the redirect plan. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.