The verdict in three sentences
Migrating a slow WooCommerce to a headless Next.js front costs between 35,000 and 90,000 EUR in 2026. When your load time exceeds 4 seconds, headless targets an LCP under 1.5s and unlocks +18 to +30% mobile conversion. On a high-traffic store, that gain repays the project in under 12 months.
Optimise WooCommerce or replatform: the right call
Before rebuilding everything, you need to know whether optimisation is enough. Here is the numbers-based comparison of both routes.
| Criterion | WooCommerce optimisation | Headless replatforming |
|---|---|---|
| Cost | 5,000–15,000 EUR | 35,000–90,000 EUR |
| Achievable LCP | 2.5–3.5s | < 1.5s |
| Expected conversion lift | +5–10% | +18–30% |
| Plugin dependency | High | Low |
| Traffic-spike scalability | Limited | High (CDN) |
| Timeline | 3–5 weeks | 12–18 weeks |
| Annual maintenance | 10–15%/year | 15%/year |
Simple rule: if your LCP stays above 3s after optimisation and mobile is over 60% of traffic, headless becomes worthwhile.
Breakdown of a 58,000 EUR headless quote
| Line item | Share | Amount (EUR) |
|---|---|---|
| Discovery + Core Web Vitals audit | 10% | 5,800 |
| Next.js front + design system | 30% | 17,400 |
| WooCommerce API / GraphQL | 22% | 12,760 |
| Content migration + SEO 301 | 16% | 9,280 |
| Checkout + payment | 14% | 8,120 |
| QA + go-live | 8% | 4,640 |
The day rate of a headless team in Berlin sits between 560 and 680 EUR in 2026. Vercel/CDN hosting costs 200 to 600 EUR/month depending on traffic, and annual maintenance is 15% of the initial cost.
Mini case study
Julian, e-commerce manager of an outdoor gear distributor in Berlin, runs a WooCommerce with a 4.2s load time and 1.1% mobile conversion. Mobile is 68% of his 320,000 monthly sessions.
He invests 58,000 EUR in a headless Next.js front. LCP drops to 1.3s, mobile conversion climbs to 1.42% (+29%). On a 95 EUR average order, that generates +29,000 EUR extra monthly revenue, i.e. 348,000 EUR/year. The project is repaid in 2.4 months of additional margin — a case where performance alone justifies everything.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
What budget for a WooCommerce headless migration in 2026?
Between 35,000 and 90,000 EUR depending on catalog and checkout complexity. The Next.js front and API make up over half the budget.
Does headless really improve conversion?
Yes: moving from a 4s LCP to under 1.5s typically brings +18 to +30% mobile conversion. The effect is strongest on mobile-heavy stores.
Do we drop WordPress entirely?
No: in headless, WordPress/WooCommerce stays as a back-office data source via API. Only the front is rebuilt in Next.js.
How much is hosting after migration?
Between 200 and 600 EUR/month on Vercel + CDN depending on traffic, versus an often under-provisioned shared WooCommerce host.
What timeline should we plan?
Between 12 and 18 weeks, Core Web Vitals audit included. The old site stays live until QA for zero downtime.
Let's scope your project. Send us your current LCP, mobile traffic share and conversion rate: we quantify the expected gain and a budget between 35,000 and 90,000 EUR. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
