The verdict in three sentences
Redesign when your site keeps solid SEO, an up-to-date CMS and a healthy architecture: you preserve your equity while changing the design. Rebuild when the CMS is obsolete, technical debt blocks changes or organic traffic collapses despite good content. The wrong choice costs double: redesigning a rotten foundation means paying for a new site again 18 months later.
Partial redesign, full redesign or new build
Three levels of intervention, three budgets. 2026 order of magnitude for an SME brochure site (10-25 pages), ex-VAT.
| Scenario | Scope | 2026 budget | Timeline | SEO preserved |
|---|---|---|---|---|
| Partial redesign | New design, same CMS/content | 3,000 - 8,000 EUR | 3 - 5 weeks | Yes, fully |
| Full redesign | New design + new CMS, content migration | 8,000 - 20,000 EUR | 6 - 10 weeks | Yes, with redirect plan |
| New build | Full rebuild, new architecture | 6,000 - 25,000 EUR | 6 - 12 weeks | Partly rebuilt |
A new build is not always dearer than a full redesign: it depends on the volume of content to migrate and the existing integration level.
The decision grid by criterion
Score one point per line for your situation. Three or more points in the right column: rebuild.
| Criterion | Lean redesign | Lean new build |
|---|---|---|
| CMS age | Under 5 years, maintained | Over 7 years or unmaintained |
| Organic traffic | Stable or rising | Falling for 12 months |
| Technical debt | Low, clean code | High, stacked plugins |
| URL structure | Logical, indexed | Chaotic, duplicates |
| Mobile / Core Web Vitals | Decent | Score < 50 |
| Annual maintenance cost | < 1,500 EUR | > 3,000 EUR |
The cost of technical debt is often invisible: a site loaded with poorly maintained plugins can cost 2,000 to 4,000 EUR a year in fixes and slowdowns, the price of a partial redesign every two years.
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Mini case study
Anna, managing director of a 22-person HR consultancy in Berlin, hesitated to keep her 2016 CMS. Diagnosis: organic traffic down 30 % over 18 months, Core Web Vitals at 38, maintenance at 3,200 EUR a year. A 6,000 EUR partial redesign would have preserved a doomed foundation. She chose a 12,000 EUR new build with a redirect plan: six months later organic traffic was up 45 % and maintenance had dropped to 1,100 EUR a year. Three-year maintenance saving: around 6,300 EUR, covering more than half the investment.
FAQ
Does a redesign lose my SEO? Not if done well: keeping URLs or setting up a 301 redirect plan preserves 90-100 % of traffic. The risk comes from rushed redesigns with no redirect plan.
How do I measure my technical debt? Add up annual corrective-maintenance cost, the number of out-of-date plugins and your Core Web Vitals score. Above 3,000 EUR a year in fixes, rebuilding becomes profitable.
How long does a site last before redesign? In 2026 a brochure site stays design-competitive for 3-4 years, but a healthy technical foundation can last 6-7 years with successive partial redesigns.
What does a partial redesign really cover? Design, UX and sometimes responsive layout, on the same CMS and content. Budget 3,000 to 8,000 EUR depending on the number of templates to redraw.
Can we migrate without downtime? Yes, with a staging environment and a DNS cutover scheduled off-peak. A well-prepared migration causes under 30 minutes of downtime.
Let's scope your project. Send us your current URL, your traffic and target budget: within 48 h we tell you whether to redesign or rebuild, with a costed quote. 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.
