WordPress powers 43% of the web. It's mature, flexible, and still the right answer for many UK businesses. But there's a quiet migration happening at the top of the market: fast-growth SMEs, consultancies, and ambitious ecommerce brands moving to headless stacks (typically Next.js + Sanity or similar).
We've migrated a number of clients. This is the honest 2026 comparison.
What does "headless CMS" actually mean?
In traditional WordPress, your content, design, and front-end are one system. The CMS renders the pages.
In a headless setup, the CMS (Sanity) only handles content. A separate front-end (Next.js) renders the pages, pulling content from the CMS through an API.
The benefits translate directly to business outcomes: faster sites, lower maintenance risk, better AI search performance, and total design freedom.
WordPress: where it still wins
Don't be talked out of WordPress if:
- You run an ecommerce business and love WooCommerce.
- You need a huge ecosystem of plugins (LMS, membership, booking).
- Your team is non-technical and loves Gutenberg block-editing.
- You have a budget under £4,000 and no appetite for a multi-month rebuild.
- Your content team already knows WordPress inside-out.
WordPress is the default for good reason.
Where WordPress struggles in 2026
- Performance ceiling. Well-optimised WordPress tops out around 85–90 on mobile PageSpeed. A Next.js site sits comfortably at 95+.
- Security overhead. Plugins, core updates, theme updates, hosting updates. All your responsibility.
- Update fatigue. Plugin conflicts, failed updates, theme-builder lock-in (Divi, Elementor).
- AI search performance. Bloated themes, heavy JavaScript, and inconsistent markup hurt GEO.
- Scaling cost. Above 50K monthly visits, WordPress hosting costs balloon.
Next.js + Sanity: the modern alternative
Next.js is a React-based framework for building fast, server-rendered sites. Sanity is a structured-content CMS. Non-technical editors get a beautiful UI; developers get an API.
Together, they produce sites that are:
- Fast by default — 95+ mobile PageSpeed consistently.
- Secure by default — no plugins, no PHP, no attack surface.
- Flexible for editors — Sanity's interface is cleaner than WordPress's.
- Ideal for AI search — semantic HTML, perfect schema, server-side rendering.
- Infinitely customisable — it's a code-first front-end.
Side-by-side comparison
| Factor | WordPress | Next.js + Sanity | |---|---|---| | Upfront build cost | £2,000–£10,000 | £5,000–£15,000 | | Monthly hosting | £10–£50 | £15–£30 (Vercel + Sanity free tier) | | Monthly maintenance | £100–£400 | £50–£150 | | PageSpeed (mobile) | 75–90 with care | 95+ by default | | Security risk | Medium–high | Very low | | Content editor experience | Good (Gutenberg) | Excellent (Sanity Studio) | | Time to build | 4–8 weeks | 6–12 weeks | | AI search readiness | Medium | Excellent | | Ecommerce | Excellent (WooCommerce) | Good (Stripe, Shopify headless) |
Who should migrate
Strong candidates:
- Growing SMEs with £500K+ revenue where site performance directly affects lead volume.
- Service businesses needing perfect Core Web Vitals and AI search visibility.
- SaaS companies where the marketing site is a product in itself.
- Content-heavy brands publishing 2+ posts a week.
- Businesses hitting scale limits on WordPress (50K+ monthly visits).
Poor candidates:
- Ecommerce stores on WooCommerce — migration is painful and often unnecessary.
- Membership sites dependent on specific WordPress plugins.
- Businesses without a technical team or agency partner.
- Small brochure sites — Framer or Webflow may be a simpler answer.
Migration: what's actually involved
A typical WordPress → Next.js + Sanity migration:
Week 1–2 — Content audit and schema design. Map every content type to a Sanity schema.
Week 3–6 — Build. Design system in Figma, front-end in Next.js, Sanity Studio configuration.
Week 7–8 — Content migration. Export from WordPress, clean and restructure, import to Sanity.
Week 9 — SEO preservation. 301 redirects for every URL, meta tags, schema, sitemap.
Week 10 — Launch. Go live, monitor, fix anything that breaks.
Budget £5,000–£15,000 depending on complexity. Expect 10–12 weeks including content migration.
Total cost of ownership over 3 years
WordPress (mid-sized marketing site): - Build: £4,000 | Hosting: £1,080 | Maintenance: £5,400 | Plugin licences: £400 - Total: £10,880
Next.js + Sanity (mid-sized marketing site): - Build: £8,000 | Hosting: £720 | Maintenance: £3,600 - Total: £12,320
Headless costs ~15% more over 3 years, but buys you significantly better performance, security, and AI visibility. For revenue-generating marketing sites, the ROI is usually clear within 6 months.
Common migration mistakes
- Skipping the content audit. You replicate a messy WordPress structure on a modern stack.
- Forgetting 301 redirects. Kills SEO overnight.
- Choosing the wrong editor tool. Sanity is great for most; Payload, Contentful, and Storyblok are alternatives.
- Ignoring editor training. Even a beautiful CMS needs onboarding.
- Migrating too early. If your site isn't generating revenue yet, a £10K rebuild is premature.
Frequently Asked Questions
What's the difference between headless and static site generators? Static site generators (Jekyll, Hugo) pre-build every page. Headless CMS + Next.js does both static and dynamic rendering as needed.
Can I do this myself as a non-developer? No. Both Next.js and Sanity require developer skills.
Is Sanity the only headless CMS worth using? No. Payload, Contentful, and Storyblok are solid alternatives.
Does this work for ecommerce? Yes, but the best path is Shopify headless (front-end in Next.js, commerce in Shopify).
The bottom line
WordPress still works for most UK businesses. But if performance, security, AI search, and long-term flexibility matter, a headless stack like Next.js + Sanity is the future-proof move.
If you're weighing a WordPress → headless migration, get in touch. We build custom websites on Next.js + Sanity as part of our custom website design service.
