The verdict in three sentences
Keep the existing site when the technical base is healthy and SEO is strong: a redesign at 8,000-20,000 EUR is enough. Rebuild when the CMS is over 5 years old, technical debt blocks any evolution, or security is no longer maintained: then budget 18,000-40,000 EUR. In both cases, the number-one risk is a mishandled SEO migration that can erase years of rankings.
The three-criteria decision grid
A CEO doesn't need a 40-page audit to decide. Three signals are enough to steer the call.
| Criterion | Favors REDESIGN | Favors REBUILD |
|---|---|---|
| CMS age | < 4 years, up to date | > 5 years, unmaintained |
| Technical debt | Clean, modular code | Obsolete plugins, recurring bugs |
| Acquired SEO | Strong, worth preserving | Weak or penalized |
| Design | Dated but salvageable | Completely obsolete |
| URL structure | Logical, keepable | Chaotic, needs rethinking |
| Available budget | 8,000 - 20,000 EUR | 18,000 - 40,000 EUR |
If you tick 3 or more "rebuild" columns, starting over will cost less mid-term than patching a system on its last legs.
Cost, timeline and risk: the hard comparison
Price is only part of the equation. Timeline and SEO risk weigh heavily in a leader's decision.
| Parameter | Redesign | Rebuild |
|---|---|---|
| Budget | 8,000 - 20,000 EUR | 18,000 - 40,000 EUR |
| Timeline | 6 - 10 weeks | 12 - 20 weeks |
| SEO risk | Low to moderate | High (full migration) |
| Possible traffic loss | 5 - 15% temporary | 20 - 50% if mishandled |
| Result lifespan | 3 - 4 years | 5 - 7 years |
| Operational disruption | Low | Medium to high |
The critical point: a rebuild requires an exhaustive 301 redirect plan. Without it, Google loses track of your pages and organic traffic drops for 2 to 6 months. This is the line item never to sacrifice.
Mini case study
Mehdi, CEO of an IT services SME in New York, is hesitating. His site is 6 years old, runs on an unmaintained CMS, but generates 3,200 organic visits/month. The agency compares: redesign at 14,000 EUR (moderate SEO risk) vs rebuild at 28,000 EUR (high risk but a 6-year lifespan). The rebuild, amortized over 6 years, comes to 4,667 EUR/year versus 4,667 EUR/year for a redesign amortized over 3 years. At equal annualized cost, Mehdi picks the rebuild to eliminate technical debt, demanding a 301 plan covering his 180 URLs to protect those 3,200 monthly visits.
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FAQ
How do I know my CMS is "too old"?
Beyond 5 years without a major update, security flaws pile up and plugins become incompatible. If your host flags obsolete PHP versions, that's a strong signal to rebuild.
Can a redesign improve SEO?
Yes, if it fixes speed, mobile and structure without breaking URLs. Done well, a redesign brings a 10 to 30% organic traffic lift in 3 to 6 months thanks to Core Web Vitals.
How long does it take to rebuild a B2B site?
12 to 20 weeks depending on page count and integrations. Development is about half the timeline; the rest splits between scoping, content and QA.
What is the real risk of a migration?
A 20 to 50% traffic loss if the 301 redirect plan is incomplete. With exhaustive old/new URL mapping, loss stays under 15% and recovers within weeks.
Can we rebuild in stages?
Yes, a phased approach (section by section) limits disruption and spreads the spend. It extends the overall timeline but reduces risk on high-traffic pages.
Let's scope your project. Tell us your CMS age, organic traffic and constraints, and we'll decide redesign (8,000-20,000 EUR) or rebuild (18,000-40,000 EUR) with a secured SEO plan. 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.
