WordPress vs Headless Next.js in London 2026: Cost, Performance and TCO

The verdict in three sentences

WordPress is still the cheapest to start with, the easiest to edit and the richest in plugins, but it pays for that flexibility in security maintenance and performance. A headless Next.js costs more to build but delivers excellent Core Web Vitals, a smaller attack surface and lighter ongoing support over time. For a brand-and-SEO-oriented brochure site, the build gap closes in 2-3 years; for a site non-technical staff edit daily, WordPress keeps the edge.

Two stacks, two cost profiles

In London, a digital director weighs the WordPress ecosystem against a decoupled architecture (Next.js + headless CMS). 2026 figures, ex-VAT (UK VAT is 20 %).

WordPress stacks core, theme and plugin updates; every plugin is a potential door. Headless separates content (CMS) from rendering (Next.js), shrinking the attack surface and locking in performance.

The 3-year TCO

The EUR 6,700 gap closes if performance drives SEO and conversion: a 1.2 s LCP lifts conversion rate and Google ranking, both directly monetisable. Beyond 3 years, the headless stack's lighter maintenance widens the gap in its favour.

Choice criteria by profile

Mini case study

James is digital director of a 6-property hotel group in London. His WordPress site is slow (LCP 3.8 s) and suffers two security incidents a year. He compares a headless build at EUR 22,000 (support EUR 140/mo) with a WordPress redesign at EUR 10,000 (support EUR 300/mo). Over 3 years, headless costs EUR 26,000 versus EUR 20,800 for WordPress, EUR 5,200 more. But an LCP cut from 3.8 s to 1.3 s lifts his booking conversion by about 8 %, several thousand euros of monthly revenue. He picks headless: performance here is a commercial asset, not a cost.

FAQ

Is WordPress cheaper than headless Next.js?

To build, yes: EUR 5,000-12,000 versus EUR 12,000-28,000. But its security maintenance (EUR 150-350/mo) narrows the gap over 3 years.

Does headless really improve performance?

Yes. A typical LCP drops from 2.5-4 s (WordPress) to 1.0-1.8 s (Next.js), benefiting SEO and conversion. Core Web Vitals are easier to keep in the green.

Can a headless site be edited without a developer?

Yes, via a headless CMS (Sanity, Strapi) with an editing interface. The experience differs from WordPress but remains accessible to marketing teams.

Which stack for a highly evolving site?

Headless: the decoupled architecture eases adding a client portal, an app or integrations without weighing down rendering.

What timeline for a London brochure site?

Around 5 weeks on WordPress, 8-10 weeks on headless Next.js, QA and content included. Headless needs more upfront scoping.

Let's scope your project. Tell us your page count, performance/SEO goals and who will edit the site, and we will price WordPress and headless side by side. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.