The verdict in three sentences
The redesign vs rebuild decision comes down to one figure: if fixing the technical debt costs more than 40 % of a new build, rebuild. A refactor runs in 2026 between EUR 5,000 and 9,000, a full rebuild between EUR 12,000 and 20,000 in Dublin. The real risk is not the budget but SEO: a mishandled migration loses 10 to 25 % of traffic that takes 6 to 12 months to recover.
The 40 % rule applied
Add up the cost of fixing each major problem. Compare it to a rebuild. Here is the 2026 decision grid.
| Signal | Redesign is enough | Rebuild recommended |
|---|---|---|
| Code age | < 4 years | > 5 years |
| Performance (LCP) | 2.5 - 4 s | > 4 s chronic |
| Structure / sitemap | Healthy | Unreadable, heavy debt |
| CMS / stack | Maintained | Obsolete or unsupported |
| Fix cost | < 40 % of rebuild | > 40 % of rebuild |
| Security | Up to date | Flaws, dead plugins |
| Design | Refreshable | Needs full rethink |
If three or more signals lean right, a rebuild is usually more profitable over 18 months.
Costed comparison of both paths
Here are the 2026 costs and timelines for an 8 to 15 page B2B SME in Dublin.
| Criterion | Refactor (light redesign) | Rebuild (new site) |
|---|---|---|
| Initial cost | EUR 5,000 - 9,000 | EUR 12,000 - 20,000 |
| Timeline | 3 - 6 weeks | 8 - 14 weeks |
| SEO risk | Low | Medium (migration) |
| Performance gain | +10 to +25 % | +40 to +70 % |
| Lifespan | 2 - 3 years | 5 - 7 years |
| Monthly maintenance | EUR 120 - 250 | EUR 200 - 400 |
| Amortised cost / year | ~EUR 3,500 | ~EUR 3,400 |
Over 18 months, the rebuild costs more upfront but its annualised cost is often equivalent, because its lifespan doubles.
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Mini case study
Karim, CFO of a 40-person industrial services SME in Dublin. His 2019 site has a 5.2 s LCP, an unsupported CMS and three abandoned plugins. The fix quote reaches EUR 7,800, versus EUR 16,000 for a rebuild: that is 49 % of the rebuild cost, above the 40 % threshold.
He chooses the rebuild. With a rigorous 301 redirect plan, he limits the loss to 8 % of traffic in month one, recovered in ten weeks. The new site converts 30 % better: on a flow of 12 leads/month at EUR 6,000 margin, that means ~3 extra won leads per quarter, paying off the EUR 8,200 gap in under six months.
FAQ
How do I objectively measure technical debt? Have an agency cost the fix for each problem (performance, security, CMS, accessibility). If the total exceeds 40 % of a rebuild's cost, rebuild.
Does migration always lose traffic? No, if prepared: an exhaustive 301 redirect plan, preserving high-performing URLs, before/after audit. Without that, the average loss is 10 to 25 %.
How long to recover SEO after migration? Between 6 and 12 weeks if migration is clean, up to 6 months if the redirect plan is incomplete or late.
Is the rebuild always more expensive in the end? Upfront yes, but its annualised cost is often equivalent because its lifespan is 5 to 7 years versus 2 to 3 for a refactor.
Can I keep the same design in a rebuild? Yes, you can rebuild the technical stack while keeping the visual identity. That cuts the design budget by 20 to 35 % while modernising the foundations.
Let's scope your project. Send us your current site URL: we'll cost the technical debt and tell you redesign (EUR 5,000-9,000) or rebuild (EUR 12,000-20,000). 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.
