The verdict in three sentences
In 2026, a Berlin marketing director chooses a redesign (keep the CMS, redo design and content) when the technical base is healthy, and a full rebuild (new stack) when technical debt exceeds 40% of the code or the CMS is no longer maintained. A redesign costs 5,000 to 12,000 EUR over 6 weeks; a rebuild 12,000 to 30,000 EUR over 12 weeks. In both cases a 301 redirect plan is mandatory, or you risk losing 20 to 30% of organic traffic.
The decision grid
The emotional reflex pushes toward a rebuild ("let's start clean"), but it's often 2x more expensive for marginal gain. Here are the objective criteria.
| Signal | Redesign is enough | Rebuild needed |
|---|---|---|
| Technical debt | < 40% of code | > 40% of code |
| CMS | Maintained, up to date | Abandoned / insecure |
| Current performance | Lighthouse > 60 | Lighthouse < 40 |
| Data structure | Reusable | Unusable |
| Need for new features | Marginal | Structural |
| Available budget | 5,000-12,000 EUR | 12,000-30,000 EUR |
If you tick 3 or more signals in the "rebuild needed" column, a rebuild is justified. Otherwise, redesign offers far better cost/value.
Cost, timeline and hidden technical debt
| Element | Redesign | Full rebuild |
|---|---|---|
| Budget 2026 | 5,000-12,000 EUR | 12,000-30,000 EUR |
| Timeline | 6 weeks | 12 weeks |
| Hidden technical debt | 20-40% of budget | Built into the estimate |
| Content migration | Partial | Complete |
| SEO risk without 301 plan | -20 to -30% traffic | -25 to -35% traffic |
| Lifespan | 3-4 years | 6-8 years |
Hidden technical debt is the most underestimated line: on a redesign, fixing aging code can add 20 to 40% to the initial budget. Require a preliminary technical audit (500-1,500 EUR) before deciding.
Mini case study
Sophie, marketing director at a Berlin software vendor (40 staff), is unsure about her 5-year-old site. The audit reveals 55% technical debt and an unmaintained CMS: rebuild signal. Rebuild quote 19,000 EUR, versus a 9,000 EUR redesign that would have hit its limits fast. The site generates 300 leads/year; the rebuild targets +25%, i.e. 75 extra leads. At an average acquisition cost of 120 EUR per lead elsewhere, annual savings reach 9,000 EUR: the rebuild pays back in about 2 years, with a 6-8 year lifespan.
FAQ
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How do I know if my technical debt exceeds 40%?
A technical audit (500 to 1,500 EUR) measures the share of obsolete, untested or undocumented code. Above 40%, each change costs more to maintain than to rebuild.
What's the price gap between redesign and rebuild?
In 2026, expect 5,000 to 12,000 EUR for a redesign and 12,000 to 30,000 EUR for a rebuild. The rebuild is 2 to 2.5x pricier but delivers double the lifespan.
Does a rebuild lose SEO traffic?
Without a 301 redirect plan, yes: 25 to 35% of organic traffic can vanish in 2-3 months. With a rigorous plan, the loss stays under 5% and recovers fast.
How long should I plan for?
A redesign takes about 6 weeks, a rebuild 12 weeks. Add a 2-week buffer for content migration and QA if you have many pages.
Can we rebuild in phases to spread the budget?
Yes, by splitting into sections (showcase, blog, client area). This spreads the investment over 2-3 phases but extends the overall timeline by 30 to 50%.
Let's scope your project. Send us your current site URL and target budget (5,000-30,000 EUR), and we'll run a pre-audit and tell you redesign or rebuild, with figures. 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.
