The verdict in three sentences
If your positioning is good but the site "looks old", a cosmetic redesign at EUR 3,000-7,000 is enough and ships in 3 to 5 weeks. If the Lighthouse score is below 50, the stack is obsolete or every change costs a fortune, a full rebuild at EUR 10,000-25,000 pays off better over three years. The right decision does not hinge on aesthetics but on technical debt and the opportunity cost of a site that throttles your growth.
Cosmetic redesign vs rebuild: the costed comparison
Here is the 2026 comparison of both scenarios for a B2B brochure site of 10 to 20 pages.
| Criterion | Cosmetic redesign | Full rebuild |
|---|---|---|
| 2026 price (EUR) | 3,000 - 7,000 | 10,000 - 25,000 |
| Timeline | 3 - 5 weeks | 8 - 14 weeks |
| CMS | Kept | New, modern |
| Technical stack | Unchanged | Renewed |
| Performance gain | Limited | Strong (LCP, SEO) |
| SEO migration risk | Low | Medium (to steer) |
| Lifespan | 2 - 3 years | 5 - 7 years |
The decision-support table
Use this grid to decide objectively. Each criterion that tips to the right pushes toward a rebuild.
| Decision criterion | Lean redesign | Lean rebuild |
|---|---|---|
| Current Lighthouse score | > 70 | < 50 |
| Stack age | < 4 years | > 5 years |
| Cost of an average change | < EUR 500 | > EUR 1,500 |
| Need for new features | Low | High |
| Quality of existing content | Good | To redo |
| Acceptable SEO loss | No | Yes, if steered |
When half the rows tip right, a rebuild is almost always the better three-year investment.
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Sofiane, director of a B2B services SME in Manchester, is hesitating. His site has a Lighthouse of 42, a 6-year-old stack, and every small change costs him EUR 1,800 on average (4 per year, or EUR 7,200/year).
Redesign option: EUR 6,000, but the technical debt remains and the EUR 7,200/year in changes continues. Over 3 years: 6,000 + 21,600 = EUR 27,600. Rebuild option: EUR 18,000, with a modern CMS cutting change cost threefold (EUR 2,400/year). Over 3 years: 18,000 + 7,200 = EUR 25,200, for a faster, better-ranked, durable site. The rebuild is cheaper AND more performant over three years.
FAQ
How do I know if my site has heavy technical debt? Typical symptoms: slow, expensive changes, obsolete plugins, no tests, Lighthouse below 50. A 1-to-2-day technical audit (EUR 600-1,400) settles the question.
Does a cosmetic redesign improve SEO? Marginally. It refreshes the design but fixes neither speed nor deep structure. For a real SEO gain you usually need to revisit the stack, meaning a rebuild.
What is the SEO risk of a rebuild? Real but manageable: with a 301 redirect plan and retention of high-performing URLs, the loss is limited to a few weeks. Without a plan, traffic can drop 20 to 40%.
Can existing content be kept? If the content converts and stays relevant, yes. Otherwise budget for rewriting; weak content on a great stack is still weak content.
How long does a site last before a redesign? A cosmetic redesign buys 2 to 3 years, a rebuild 5 to 7 years. Beyond that, evolving web standards and visual expectations force a restart.
Let's scope your project. Send us your site URL and your main frustrations: we audit the technical debt and recommend redesign or rebuild, budget in hand. 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.
