Real Costs of Migrating WordPress to Next.js in 2026 – What to Expect

Why the Migration Cost Isn't a Single Number

When you ask a vendor for a price, they’ll give you a ball‑park. In reality the cost lives in three dimensions: content complexity, data hygiene, and UI redesign. A 10‑page brochure site with clean XML exports will sit at the low end, while a multi‑store e‑commerce platform with legacy plugins can explode to five‑figures. The framework switch itself is cheap; the work around it is what burns budget.

Tier 1 – Tidy Content Site (<20 pages)

Typical scope: static pages, a single blog, no custom post types, minimal SEO rewrites. You’ll spend most of the budget on content extraction and a thin getStaticProps layer.

export async function getStaticProps() {
  const data = await fetch('https://example.com/wp-json/wp/v2/pages');
  return { props: { pages: await data.json() } };
}

Estimated range: $3,000‑$8,000. Most of that goes to a junior dev plus a part‑time designer.

Tier 2 – Medium Site with Custom Types

Scope expands to custom post types (CPTs), a moderate plugin stack (SEO, forms, membership), and a handful of dynamic pages. You’ll need to map CPTs to TypeScript interfaces, write a small data‑layer wrapper, and possibly replace a few WordPress‑only features with third‑party SaaS.

type Project = {
  id: number;
  title: string;
  slug: string;
  featuredImage: string;
  techStack: string[];
};

export async function getStaticPaths() {
  const res = await fetch(`${API}/projects`);
  const projects: Project[] = await res.json();
  return { paths: projects.map(p => ({ params: { slug: p.slug } })), fallback: false };
}

Estimated range: $8,000‑$20,000. The bulk is spent on a mid‑level engineer, data‑clean‑up scripts, and UI polish.

Tier 3 – Full‑Scale E‑Commerce or Legacy Bloat

Here you’re untangling years of WooCommerce, custom plugins, and a tangled taxonomy. You’ll likely rebuild the checkout flow, integrate a headless commerce API (Shopify, Medusa, or Stripe), and rewrite any PHP‑only business logic in Node.

• Re‑architect product catalogs into a normalized GraphQL schema.
• Replace WordPress‑only shortcodes with React components.
• Implement incremental static regeneration for price‑sensitive pages.

Estimated range: $20,000‑$50,000+. Expect senior engineers, a dedicated QA sprint, and possibly a third‑party integration consultant.

Hidden Costs You’ll Hit Anyway

Even the cleanest migration has surprise line items:

1. Content hygiene: Bad HTML, duplicate meta tags, and orphaned media can double the time spent on data scripts.
2. SEO preservation: 301 mapping, schema updates, and link‑juice checks often require an SEO specialist.
3. Performance tuning: Image optimization, edge caching, and LCP fixes add a few days of work.

Factor an extra 15‑25 % on top of the tier estimate to cover these.

Practical Tips to Keep the Budget in Check

1. Export early, clean often. Use WP‑CLI to dump JSON, then run a jq script to strip unused fields.

wp export --post_type=page,post --output=site.json && jq 'del(.meta._edit_lock)' site.json > clean.json

2. Pick a headless CMS for the long run. If you anticipate future content editors, migrate to Contentful or Sanity instead of hand‑rolling a CMS.

3. Scope UI work separately. A design system built once can be reused across tiers, preventing repeated UI spend.

Bottom line: the migration cost is a function of how messy your WordPress garden is, not the fact that you’re moving to Next.js. Start with a clear inventory, budget for data cleanup, and you’ll avoid the dreaded “five‑figure surprise”.