The verdict in three sentences
If your information architecture and domain are healthy and technical debt stays under 40%, a refactor at 5,000-12,000 EUR preserves your SEO and ships in 4-6 weeks. If the CMS is obsolete, unmaintained, or more than 40% of the code must be rewritten, a full rebuild at 12,000-25,000 EUR costs less over three years than permanent patching. The deciding factor is not the site's age but the cost of ownership and the SEO risk of another URL change.
Numeric decision grid 2026
The first question is not aesthetic, it is economic. Compare total cost of ownership (TCO) over 36 months, not the sticker price.
| Criterion | Refactor (5,000-12,000 EUR) | Rebuild (12,000-25,000 EUR) |
|---|---|---|
| Technical debt | < 40% of code to rewrite | > 40% or unmaintained CMS |
| Domain and URLs | Kept, SEO preserved | New URL plan + 301s |
| Delivery time | 4-6 weeks | 10-14 weeks |
| SEO risk | Low (pages kept) | Medium (301 mapping required) |
| Performance target | Lighthouse 75-90 | Lighthouse 90-99 |
| Estimated lifespan | 2-3 years | 5-6 years |
| 36-month TCO | 9,000-18,000 EUR | 15,000-30,000 EUR |
A refactor always looks cheaper on signing day. But if you redo it 30 months later, you paid twice. A rebuild only makes sense when the debt is real: end-of-life CMS, incompatible plugins, untestable code.
Traffic and conversion thresholds
The revenue the site generates should calibrate the investment. Below a certain traffic level, a rebuild is a luxury.
| Monthly traffic | Current leads/month | 2026 recommendation |
|---|---|---|
| < 1,000 visits | < 5 | Light refactor 5,000-8,000 EUR |
| 1,000-5,000 visits | 5-20 | Full refactor 8,000-12,000 EUR |
| 5,000-15,000 visits | 20-50 | Rebuild 12,000-18,000 EUR |
| > 15,000 visits | > 50 | Premium rebuild 18,000-25,000 EUR |
Simple rule: if one extra conversion point is worth more than 20,000 EUR of annual revenue, the rebuild repays itself in under a year.
Mini case study
Antoine, owner of an engineering SME in Toronto, inherits a 2017 WordPress site: 42 plugins, 3,200 visits/month, 14 leads/month, Lighthouse at 38. Technical debt is assessed at 55%: rebuild recommended. Budget: 16,500 EUR, delivery in 12 weeks. Result at 6 months: Lighthouse 94, 22 leads/month (+57%). Each lead is worth on average 4,500 EUR of engagement; the 8 extra monthly leads generate 36,000 EUR of potential monthly revenue. The investment is amortized in under two months of pipeline.
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FAQ
Can a refactor tank my SEO?
Yes, if you change URLs without a redirect plan. A refactor that keeps the URL structure preserves 95-100% of organic traffic; a poorly handled rebuild can lose 20-40% for 2-3 months.
How do I measure my technical debt?
Quick audit: CMS age, plugin count, Lighthouse score, test coverage, ability to update without breaking. Beyond 40% of code to rewrite, rebuilding costs less.
How long does a simple refactor take?
Expect 4-6 weeks for a 5,000-12,000 EUR refactor versus 10-14 weeks for a rebuild. Timing is often the deciding factor in B2B.
Can I keep my current hosting?
Often not for a modern rebuild (Next.js, edge). Budget 25-75 EUR/month for managed hosting plus a DNS migration line item.
Is redoing the site every 3 years normal?
No. A well-built site lasts 5-6 years. Repeated refactors betray untreated debt: investing once properly costs less than patching every 30 months.
Let's scope your project. Give us your current CMS, monthly traffic and indicative budget: we settle refactor vs rebuild with a costed 36-month TCO. 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.
