The verdict in three sentences
A performance-focused store redesign costs between 20,000 and 60,000 EUR (excl. tax) in 2026, depending on catalogue, checkout funnel and the optimization level you target. The rule that justifies the spend: every 100 ms of latency costs about 1 % of conversion. A well-targeted redesign aims for a +0.5 to +1.2 point conversion gain, often paying back in under a year.
What drives cost in a performance redesign
Performance isn't just speed: it's a smooth checkout funnel, flawless mobile and SEO that doesn't collapse after migration.
| Line item | What it delivers | 2026 budget (EUR excl. tax) |
|---|---|---|
| Fast technical base | LCP < 2.5 s, green Core Web Vitals | 6,000 - 15,000 |
| Optimized checkout funnel | Less cart abandonment | 4,000 - 12,000 |
| Mobile-first | 60-70 % of e-commerce traffic | 3,000 - 9,000 |
| Clean SEO migration | Preserves organic traffic | 3,000 - 8,000 |
| Product design and UX | Better perception, higher basket | 4,000 - 12,000 |
| Analytics and A/B testing | Continuous measurement | 2,000 - 6,000 |
Full redesign or targeted optimization?
Before rebuilding everything, measure. Sometimes a few optimizations deliver nearly as much as a redesign, for a fifth of the budget.
| Scenario | Scope | 2026 budget | Target conversion gain |
|---|---|---|---|
| Targeted optimization | Speed, funnel, a few key pages | 5,000 - 12,000 EUR | +0.3 to +0.6 pt |
| Partial redesign | Front + funnel + mobile, back kept | 20,000 - 35,000 EUR | +0.5 to +0.9 pt |
| Full redesign | New base, design, SEO, analytics | 40,000 - 60,000 EUR | +0.8 to +1.2 pt |
Also budget recurring costs: 500 to 2,000 EUR/month for performant hosting, maintenance and analytics tracking. A redesign without continuous measurement loses half its value within a year.
Mini case study
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Julie runs a pro-textile store: 1.4M EUR revenue/year, a 1.3 % conversion rate, measured LCP of 4.1 s. She invests 34,000 EUR (excl. tax) in a partial redesign focused on speed and checkout.
After go-live, LCP drops to 2.2 s and conversion rises to 2.0 %, i.e. +0.7 point. At constant traffic, that's a revenue lift on the order of +54 % on affected online sales, roughly 750,000 EUR of potential additional revenue at constant margin. Even on a conservative scenario (+0.4 pt truly attributable), the extra margin covers the 34,000 EUR in under 8 months. Estimated payback: 6 to 9 months.
FAQ
What does a slow site really cost? The benchmark rule: every 100 ms of latency costs about 1 % of conversion. On a site doing 1.4M EUR, going from 4 s to 2 s can be worth tens of thousands of euros a year.
Redesign or just optimization? If your back office is fine and only the front lags, a targeted optimization at 5,000-12,000 EUR may suffice. Redesign only if the technical base durably caps performance.
How do I avoid losing SEO during the redesign? A full 301-redirect plan, keeping key URLs, and tracking rankings post-migration. A botched SEO migration can cost 20-40 % of organic traffic for months.
What conversion rate should I target in 2026? A good B2B/B2C store runs between 1.5 and 3 %. Going from 1.3 to 2 % is realistic with a performance redesign; beyond that, work the offer and traffic, not just the tech.
How long does a redesign take? Budget 8 to 14 weeks for a partial redesign, 14 to 22 weeks for a full one with SEO migration and analytics. Targeted optimization fits in 3 to 6 weeks.
Let's scope your project. Send us your online revenue, current conversion rate and Core Web Vitals, and we'll quote optimization or a redesign. 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.
