WordPress to Next.js Migration: The Real Cost (From a Team That's Done 15)

You Probably Don't Need to Leave WordPress (But Maybe You Do)

Let's get the uncomfortable truth out of the way first. Most businesses migrating from WordPress to Next.js, Remix, or any custom stack are doing it for the wrong reasons. They read a blog post about how WordPress is slow, or their developer friend told them 'WordPress is dead,' and now they want to rebuild everything from scratch.

We've done about 15 of these migrations in the past two years. Roughly half of them shouldn't have happened at all. The clients would have been better off spending $3K on WordPress optimization instead of $25K-60K on a full rebuild.

So before I tell you how to migrate, let me help you figure out if you actually should.

When WordPress Actually Becomes the Problem

WordPress handles 43% of the web. It's not going anywhere. But there are specific, measurable situations where it starts holding you back:

Your page load time is above 4 seconds even after optimization. You've done the basics - caching plugin, image optimization, CDN, good hosting. If it's still slow, you're probably running 30+ plugins that conflict with each other, and your theme is loading 800KB of CSS you don't use. At that point, patching WordPress is like putting racing tires on a minivan.

You need real-time features. Live dashboards, instant notifications, collaborative editing, WebSocket stuff. WordPress can sort of do this with plugins, but it's held together with duct tape. We took over a project where someone built a live auction system on WordPress using three plugins and custom PHP. It crashed every time more than 50 users were bidding simultaneously.

Your content model is complex. If you have products with 15 custom fields, related content types that reference each other, and editors who need a proper workflow - WordPress custom fields get messy fast. Advanced Custom Fields is great until you have 200 field groups and your admin panel takes 8 seconds to load.

You're spending more on WordPress maintenance than you would on hosting a modern stack. This is the one nobody talks about. If you're paying $500/month for managed WordPress hosting, $200/month for premium plugins, and $1K/month for a developer to keep things updated and secure - that's $20K/year. A Next.js site on Vercel might cost you $20/month to host.

The Real Cost Breakdown (Not the Fake Ones You See Online)

Every agency website says 'starting from $5,000' for a migration. That's like saying a house renovation starts at $500. Technically true if you're just painting one wall.

Here's what migrations actually cost based on our last 15 projects:

Simple brochure site (5-15 pages, blog, contact form)

WordPress to Next.js with headless CMS: $8,000-15,000. Timeline: 4-6 weeks. This includes setting up Sanity or Contentful, migrating all content, building the frontend, redirects, SEO preservation. Most agencies quote $5K for this but then hit you with change orders when they realize your contact form has conditional logic and your blog has 200 posts with custom shortcodes.

Mid-size business site (50-100 pages, e-commerce, member area)

This is where it gets expensive. $25,000-45,000. Timeline: 8-14 weeks. The e-commerce migration alone can eat $10K if you're moving from WooCommerce to Shopify or a custom solution. Every product, variant, customer account, order history - it all needs to move. And if you have recurring subscriptions through WooCommerce Subscriptions, add another $5K just for the payment migration. We had a client with 3,000 products and 12,000 customer accounts. The data migration script alone took two weeks to write because WooCommerce stores product variations in the weirdest way.

Complex web application (custom functionality, integrations, user-generated content)

$50,000-120,000. Timeline: 4-8 months. If your WordPress site has evolved into a web application with custom plugins, API integrations, user portals, booking systems - you're basically building a new product. The WordPress part is almost irrelevant at this point. You're rebuilding business logic.

The Hidden Costs Nobody Mentions

SEO migration tax. Google will temporarily drop your rankings during a migration. Even if you do everything right - 301 redirects, same URL structure, proper canonicals - expect a 10-30% traffic dip for 2-4 months. For a site doing $50K/month from organic traffic, that's potentially $20-60K in lost revenue. Factor that into your migration budget.

Content editor retraining. Your marketing team knows WordPress. They've been using it for years. Now they need to learn a headless CMS. Budget 1-2 weeks of reduced productivity and some hand-holding. We usually include 3 training sessions in our migration packages, and even then, someone always calls asking where the 'Add Media' button went.

Plugin replacement development. That $49 WordPress plugin that handles your email automation? In Next.js, you're writing that integration yourself or paying a developer to connect it to your email service API. Every plugin you relied on needs a custom replacement or a SaaS subscription. We've seen clients go from $200/month in plugins to $600/month in SaaS subscriptions, but with much better reliability.

Staging and QA. You need to run both sites simultaneously for at least 2-4 weeks. Double hosting costs, DNS switchover planning, SSL certificates. Small stuff, but it adds up to $500-2000 that nobody budgets for.

How We Actually Do the Migration (Step by Step)

Week 1-2: Audit everything. We crawl the entire WordPress site, document every page, every form, every integration. We check Google Analytics to find which pages actually get traffic (spoiler: usually 20% of pages drive 80% of traffic). We map out all 301 redirects. This is boring work but it prevents disasters.

Week 3-4: Set up the new stack. For most projects, we use Next.js 14+ with App Router, Sanity as the CMS (sometimes Strapi if the client wants self-hosted), and Vercel for deployment. We build the content models in the CMS first, because if you get this wrong, everything else suffers.

Week 5-8: Build and migrate. Frontend development happens alongside content migration. We write Python scripts to pull content from WordPress REST API and push it into Sanity. Images get optimized and moved to a CDN. The tricky part is always the body content - WordPress stores it as HTML with shortcodes, and you need to convert that to structured content (portable text in Sanity's case).

Week 9-10: QA and launch. We run both sites side by side. Check every page. Test every form. Verify every redirect. Run Lighthouse audits. Check mobile rendering. Then we flip DNS and hold our breath for 48 hours.

When to Just Fix WordPress Instead

If your main complaint is speed, try these first (total cost: $2,000-5,000):

Switch to a modern host like Cloudways or Kinsta. Drop the bloated theme and use GeneratePress or a custom lightweight theme. Audit your plugins - most sites have 10+ plugins they don't actually use. Set up proper caching with WP Rocket or W3 Total Cache. Use Cloudflare for CDN and security.

We've taken WordPress sites from 8-second load times to under 2 seconds with just these changes. No migration needed. Saved the client $40K.

If your main complaint is the editing experience, try switching to a better page builder or use WordPress as a headless CMS with its built-in REST API. You get the editing interface your team already knows, with a fast modern frontend. Best of both worlds, and it costs about 60% less than a full migration.

The Bottom Line

WordPress to Next.js migration makes sense when WordPress is genuinely limiting your business growth - not just when it feels old. If you're spending more maintaining WordPress than building features, if your users are bouncing because of slow load times you can't fix, or if you need capabilities that WordPress was never designed for - then yes, migrate.

But do it with your eyes open. Budget 2-3x what the first agency quotes you. Plan for the SEO dip. Train your team. And for the love of all things holy, don't migrate during your peak sales season.

We've rescued three migrations that other agencies botched mid-way through. Starting over from someone else's half-finished code costs more than doing it right the first time. If you're considering a migration, we're happy to do a free audit and tell you honestly whether you should go through with it or just optimize what you have.

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