The verdict in three sentences
For a mid-sized New York company whose 400-page site runs on 28 WordPress plugins, migrating to Next.js and a headless CMS costs 40,000 to 80,000 USD and takes 10 to 14 weeks. Performance typically improves by 40 to 60 %, with a much smaller attack surface. The real risk is not technical but SEO: without a 301 redirect plan covering all 1,100 indexed URLs, you can lose 20 to 40 % of organic traffic for months.
Why migrate, and when not to
WordPress still works well for a blog or small site. On a 400-page corporate site maintained by a 3 to 5 person communications team, hidden costs pile up: plugin updates that break layouts, recurring vulnerabilities, a page builder that bloats every template.
| Criterion | Current WordPress (28 plugins) | Next.js + headless CMS |
|---|---|---|
| Average mobile LCP | 3.8 to 4.5 s | 1.6 to 2.2 s |
| Security updates per year | 60 to 90 | 10 to 15 (dependencies) |
| Layout incidents after updates | 4 to 8 per year | Near zero (pinned versions, tests) |
| Hosting | 100 to 300 USD/month (server + cache) | 0 to 180 USD/month (edge platform) |
| CMS licensing | Premium plugins 1,800 to 3,500 USD/year | 0 to 350 USD/month depending on CMS |
| Editor experience | Familiar but fragile | Structured fields, live preview |
| Developer hiring | Plenty of WordPress profiles | Plenty of React/Next.js profiles |
Migration makes little sense if your site has fewer than 50 pages, if your editorial team rejects any tool change, or if most of your value sits in a WordPress-specific plugin with no equivalent. In those cases, targeted optimisation at 8,000 to 15,000 USD is enough.
Detailed 2026 budget
New York rates are higher than in Paris, where the same scope runs 22,000 to 45,000 EUR excluding VAT.
| Item | Range (USD) | Comment |
|---|---|---|
| Audit and mapping of 1,100 URLs | 4,500 to 8,000 | Crawl, Search Console data, backlinks |
| Content modelling in the headless CMS | 5,500 to 11,000 | 12 to 20 content types |
| Design system and Next.js templates | 13,000 to 27,000 | 15 to 25 responsive templates |
| Automated migration script for 400 pages | 6,000 to 13,000 | Cleaning page-builder HTML |
| 301 redirect plan and testing | 3,500 to 7,000 | 1-to-1 mapping, automated tests |
| QA, WCAG 2.1 AA, editor training | 4,000 to 8,000 | 2 training sessions |
| 4-week post-launch hypercare | 3,500 to 6,000 | Search Console monitoring and fixes |
| Total | 40,000 to 80,000 | Excluding CMS subscription (0 to 350 USD/month) |
CMS choice drives recurring cost: self-hosted Payload or Strapi carry no licence fee, while Sanity or Contentful start free and rise to 100 to 350 USD per month for multiple editors and role management.
Risks and how to control them
| Risk | Likelihood without a plan | Mitigation |
|---|---|---|
| Organic traffic loss | High | Exhaustive 301 mapping, titles and meta tags preserved |
| Broken internal links | High | Automatic rewriting in the migration script |
| Lost forms and CRM integrations | Medium | Inventory of all 28 plugins and their functions |
| Editorial team pushback | Medium | Modelling workshops, live preview |
| Schedule overrun | Medium | Phased delivery by section, 2-week content freeze |
| Orphaned media files | Low to medium | Media library migration with SEO renaming |
Mini case study
Daniel Brooks, CIO of a 900-employee industrial company in New York, currently pays 260 USD per month for hosting, 2,800 USD per year for plugin licences and about 18,000 USD per year in corrective maintenance from an agency (post-update incidents, security). Current annual cost: 23,920 USD.
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After a 60,000 USD migration, recurring cost falls to 140 USD per month hosting, 180 USD per month CMS and 7,000 USD per year maintenance, so 10,840 USD. The annual saving is 13,080 USD, paying the project back in about 4.6 years on technical costs alone, before counting the conversion gain from halving LCP, which usually shortens payback considerably.
FAQ
Will we lose search rankings during the migration?
A temporary 5 to 10 % dip for 2 to 4 weeks is common even with a good plan. Without exhaustive 301 redirects, losses can reach 20 to 40 % and last for months.
Will our editors need to learn a new tool?
Yes, but a well-modelled headless CMS is simpler than a page builder. Two 3-hour training sessions are usually enough for a 3 to 5 person team.
Can we migrate in stages?
Yes, section by section: start with product or careers pages while the old WordPress keeps serving the rest. This adds 10 to 15 % to the budget but sharply reduces risk.
Which headless CMS should we choose?
For a 400-page site with 3 to 10 editors, Sanity, Payload or Strapi all fit. Licence cost ranges from 0 to 350 USD per month, and the deciding factor is the approval workflow you need.
How long does the project take?
Allow 10 weeks for a well-documented site and 14 weeks if content is uneven or multilingual. The editorial freeze only lasts 2 weeks before cut-over.
Let's scope your project. Share your page count, plugin list and indexed URLs: we will price the migration with a 301 plan, indicative budget and a 10 to 14 week schedule. 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.
