The verdict in three sentences
In 2026, the choice between redesign and rebuild comes down to three criteria: technical debt, Core Web Vitals score and SEO migration cost. A light redesign costs 4,000-8,000 EUR (2-4 weeks), a full redesign 9,000-18,000 EUR (6-10 weeks), a full-stack rebuild 15,000-35,000 EUR (10-16 weeks). Starting from scratch is only rational when technical debt is unmanageable; otherwise a redesign preserves your SEO equity — a traffic asset a migration puts at 6 to 12 % risk.
The costed 2026 decision grid
Here is how to decide based on your site's real state.
| Option | 2026 budget (EUR excl. VAT) | Timeline | When to choose it |
|---|---|---|---|
| Light redesign | 4,000 - 8,000 | 2 - 4 wks | Dated design, healthy structure |
| Full redesign | 9,000 - 18,000 | 6 - 10 wks | UX + SEO to rework, reusable base |
| Full-stack rebuild | 15,000 - 35,000 | 10 - 16 wks | Heavy debt, obsolete CMS |
The central question: is your technical base salvageable? If the CMS is maintained and the code clean, a full redesign delivers 80 % of the benefit for half the price of a rebuild.
Core Web Vitals and SEO migration cost
The criterion that often tips the decision is performance and SEO risk.
| Metric | Healthy 2026 threshold | Impact on decision |
|---|---|---|
| LCP | < 2.5 s | > 4 s = consider rebuild |
| CLS | < 0.1 | Instability = front redesign |
| INP | < 200 ms | Sluggishness = JS debt |
| Traffic at risk in migration | 6 - 12 % | 301 redirects mandatory |
| SEO migration plan cost | 1,500 - 4,000 EUR | By number of URLs |
A poorly prepared migration can drop traffic by 6 to 12 % for several months. The 301 redirect plan, priced at 1,500-4,000 EUR, is never optional once you change URL structure.
Mini case study
Thomas, director of a digital services SME in New York (24 staff), has a 2019 site: decent design but LCP at 5.2 s and an unmaintained CMS. He hesitates between a full redesign at 14,000 EUR and a rebuild at 28,000 EUR. His site generates 60,000 visits/year and 20 leads/month. A migration risks 8 % of traffic, i.e. 4,800 visits — but the obsolete CMS is a security time bomb. He chooses the 28,000 EUR rebuild, budgets 3,000 EUR for the SEO (301) plan to limit loss to 3 %, and targets LCP < 2 s. Expected gain: +25 % conversion from speed, i.e. 5 more leads/month at 1,500 EUR value — the rebuild pays off in about four months.
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FAQ
How do I know if my site has heavy technical debt?
If the CMS is no longer updated, the code is a pile of plugins, or LCP exceeds 4 seconds, debt is likely critical. A 1-2 day audit (500-1,200 EUR) settles it.
Will I lose my rankings by changing sites?
A real risk of 6 to 12 % traffic exists without a migration plan. With clean 301 redirects and key content retained, loss often stays at 2-4 % and recovers within months.
Can a light redesign be enough?
Yes if the structure is healthy and only the design is ageing. At 4,000-8,000 EUR in 2-4 weeks, it is the most cost-effective option when the technical base holds.
How much is the SEO migration plan?
Between 1,500 and 4,000 EUR by number of URLs. It is insurance against a traffic drop: never cut it on a site that drives business.
How long for a full rebuild?
Expect 10 to 16 weeks. That is the price of a clean, performant, scalable base for the next 4-5 years.
Let's scope your project. Share your current site URL, your Core Web Vitals scores and your indicative budget: we settle redesign vs rebuild with clear pricing. 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.
