The verdict in three sentences
A UX/UI redesign of a business app (audit, prototyping, design system, integration) costs 15,000 to 50,000 EUR and takes 8 to 16 weeks. It cuts training time by 30 to 50%, input errors by ~40%, and lifts the adoption rate from 20 to 65%. The ROI comes from recovered productivity across dozens of daily users, not from aesthetics.
What a redesign covers and its cost
A serious redesign is not a facelift: it starts from a usage audit, produces a design system, and ends with front-end integration. 2026 orders of magnitude (France):
| Phase | Range (EUR) | Deliverable |
|---|---|---|
| UX audit & research | 3,000 - 8,000 | Analysis, journeys, friction points |
| Prototyping & testing | 4,000 - 12,000 | Mockups, user tests |
| Design system | 4,000 - 12,000 | Components, tokens, guidelines |
| Front-end integration | 6,000 - 20,000 | Redesign of key screens |
| Adoption support | 2,000 - 6,000 | Training, documentation |
A redesign focused on the 5-6 most-used screens stays at the low end; a full redesign of an internal ERP climbs toward 40,000-50,000 EUR.
The measurable gains of good UX
UX is measurable: time per task, error rate, adoption, support tickets. Here are the orders of magnitude observed after a successful redesign.
| Metric | Before redesign | After redesign | Gain |
|---|---|---|---|
| Training time | 5 days | 2.5 - 3.5 days | -30 to -50% |
| Input errors | Baseline 100 | ~60 | -40% |
| Adoption rate | 20% | 65% | 3x |
| Time per key task | Baseline 100 | 70 - 80 | -20 to -30% |
| Support tickets/month | Baseline 100 | 55 - 70 | -30 to -45% |
Across 40 to 80 daily users, these percentages quickly translate into dozens of hours saved each week.
Mini case study
Thomas, product director of an industrial SME in Lyon, runs a production data-entry app used by 60 operators. Each loses ~25 minutes/day to confusing screens, and the error rate drives costly rework.
He invests 32,000 EUR in a 12-week UX/UI redesign. Time per task drops 25%, i.e. ~6 minutes/day recovered per operator. Across 60 operators over 220 working days at a loaded cost of ~30 EUR/hour: 60 x 6 min x 220 = ~1,320 hours/year, i.e. ~39,600 EUR/year in productivity. The redesign pays back in under 10 months, not counting the drop in errors and support tickets.
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FAQ
What does a UX/UI redesign cost in 2026?
Between 15,000 and 50,000 EUR by scope: a redesign focused on key screens stays under 25,000 EUR, a full internal-ERP redesign nears 50,000 EUR.
How long does a redesign take?
Expect 8 to 16 weeks, including audit, prototyping, user tests, design system, and integration of priority screens.
How to measure a redesign's ROI?
On time per task and error rate: a 20-30% time cut across dozens of daily users often generates tens of thousands of euros in productivity per year.
Should you redo everything or target?
Target the 5-6 most-used screens first: they concentrate most of the time and errors, for a controlled cost and fast ROI.
Is a design system really worth it?
Yes: it speeds up future changes, guarantees consistency, and cuts the cost of later development by 20 to 30%.
Let's scope your project. Tell us your daily user count, the most problematic screens, and your goals (adoption, errors, training), and we quote the 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.
