The verdict in three sentences
A B2B redesign that misses its conversion target is an expense; one that targets speed, the ordering funnel and SEO is an investment with measurable ROI. The 2026 budget lands between 33,000 and 88,000 EUR all-in (design, dev, migration, SEO carry-over). A +20 to +45 % conversion lift usually repays the redesign in 8 to 16 months.
The cost lines of a B2B redesign
A redesign isn't just a fresh coat of paint. Here's the cost breakdown for a mid-sized B2B store (2026 order of magnitude, day rate 600-800 EUR).
| Line item | Range (EUR) | What's included |
|---|---|---|
| UX + journey audit | 4,000-9,000 | Funnel analysis, user testing |
| UI design + design system | 8,000-20,000 | Mockups, components, mobile |
| Front-end dev + integration | 13,000-41,000 | Funnel, accounts, price lists |
| Catalog migration | 5,000-12,000 | Products, variants, media |
| SEO carry-over (redirects, tags) | 3,000-6,000 | 301 redirect plan, structured data |
| Total | 33,000-88,000 | Full redesign delivered |
SEO carry-over is the most underestimated line: without a clean 301 redirect plan, a redesign can drop organic traffic 20 to 40 % for several months.
Redesign vs replatforming: don't confuse them
Reworking the interface on the same tech core costs differently than changing platform. Here are the benchmarks.
| Criterion | Redesign (same core) | Replatforming (new core) |
|---|---|---|
| Budget | 25,000-70,000 EUR | 60,000-150,000 EUR |
| Timeline | 3-6 months | 4-8 months |
| SEO risk | Moderate | High (URLs, structure) |
| Expected perf gain | +30-60 % speed | 2x to 3x |
| Downtime | Near zero | Planned window |
| When to choose | Sound core, dated UX | Blocking core, tech debt |
If your current core holds up and handles your B2B price lists, a redesign suffices. If it caps you on per-customer pricing or ERP, replatforming becomes unavoidable.
Additional revenue projection
A B2B store doing 1.2M EUR/year at 1.4 % conversion and a 480 EUR average basket. Core Web Vitals target: LCP < 2.5 s. EU hosting: 150 to 600 EUR/month by traffic.
| Scenario | Conversion | Annual revenue | Delta |
|---|---|---|---|
| Before redesign | 1.4 % | 1,200,000 EUR | — |
| +20 % lift | 1.68 % | 1,440,000 EUR | +240,000 EUR |
| +45 % lift | 2.03 % | 1,740,000 EUR | +540,000 EUR |
Even at the low end, +240,000 EUR of additional revenue covers a 60,000 EUR redesign in under 3 months of released margin.
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Mini case study
Claire, CFO of a medical-equipment distribution SME in Lyon, runs an aging B2B store: 1.1M EUR online, 1.3 % conversion, 4.1 s LCP. She approves a 58,000 EUR redesign plus 11,000 EUR of migration and SEO, i.e. 69,000 EUR. After redesign, conversion climbs to 1.8 % (+38 %) and revenue gains 420,000 EUR over the year. Payback reached in 4.5 months of additional margin, before the SEO effect ramps up.
FAQ
How long does a B2B redesign take?
3 to 6 months by scope: audit and design (6-8 weeks), development and migration (8-14 weeks), testing and go-live (2-3 weeks).
How do I avoid losing my SEO?
Exhaustive 301 redirect plan, keep key URLs, product structured data, and freeze major changes 4 weeks before and after. Budget 3,000 to 6,000 EUR for this line.
What conversion lift should I target?
+20 to +45 % is realistic on a dated store, driven by speed (LCP < 2.5 s), a simplified funnel and strong product search.
Redesign or new platform?
If your core handles price lists and connects to your ERP, redesign. If it blocks you functionally, replatform (60,000-150,000 EUR).
What hosting budget should I plan?
150 to 600 EUR/month in the EU by traffic and peaks, CDN included. Cheap shared hosting wrecks your Core Web Vitals and conversion.
Let's scope your project. Send us your SKU count, current conversion rate and your core, and we'll price the redesign and project additional revenue. 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.
