The verdict in three sentences
A UX/UI redesign of a web app costs, in 2026, 2,500 to 6,000 EUR for the audit and 12,000 to 30,000 EUR for the redesign + design system, delivered in 8 to 14 weeks. A cosmetic redesign (colors, type, components) costs half as much but fixes no journeys; a structural redesign reworks navigation and flows, the only one able to cut churn. ROI reads on two levers: -20 % support tickets and +15 % activation.
The line items of a UX/UI redesign
| Line item | 2026 range (EUR) | Detail |
|---|---|---|
| UX audit (heuristic + data) | 2,500 - 6,000 | Journey, funnel, interviews |
| User research & testing | 2,000 - 5,000 | Interviews, tests, personas |
| UI kit + design system | 5,000 - 12,000 | Components, tokens, docs |
| Key-screen redesign | 4,000 - 12,000 | Mockups, prototypes |
| Front-end integration | 4,000 - 10,000 | React, WCAG accessibility |
| UAT + iterations | 1,500 - 4,000 | A/B tests, measurement |
| Total (excl. audit only) | 12,000 - 30,000 | 8 to 14 weeks |
2026 order of magnitude: a structural redesign of a B2B SaaS (10-15 screens, delivered design system) lands near 22,000 EUR.
Cosmetic vs structural redesign
| Criterion | Cosmetic | Structural |
|---|---|---|
| 2026 cost | 6,000 - 14,000 EUR | 18,000 - 30,000 EUR |
| Scope | Colors, type, components | Navigation, journeys, flows |
| Design system | Optional | Delivered and documented |
| Churn impact | Low | High |
| Activation impact | +3 to 5 % | +10 to 20 % |
| Timeline | 4 - 7 weeks | 8 - 14 weeks |
| User testing | Rarely | Systematic |
| Best for | Refreshing a brand | Stopping product churn |
If your problem is visual (dated image), cosmetic suffices. If users get lost, abandon onboarding or flood support, only structural redesign moves the metrics.
Mini case study
Claire, CFO of a B2B SaaS vendor in Lyon (1,400 paying accounts, 2.1M EUR ARR). Monthly churn was climbing to 4.2 %, fueled by aging UX: confusing onboarding, rising support tickets. She commissions a structural redesign at 24,000 EUR with a design system and reworked activation journeys.
Results at 4 months: activation +15 % (more trials converted), support tickets -22 % (≈ 1.5 support FTE saved, ≈ 55,000 EUR/year), churn down from 4.2 % to 3.3 %. On 1,400 accounts at ≈ 125 EUR/month, cutting churn by 0.9 points retains ≈ 12.6 accounts/month, i.e. +18,900 EUR of annual ARR preserved. Payback in about 5 months, support benefit included.
FAQ
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Do I need an audit before redesigning?
Yes: without an audit (2,500-6,000 EUR), you make it prettier without fixing real friction. The audit crosses UX heuristics with real data (funnel, heatmaps, tickets) to prioritize what moves the metrics.
Is a design system essential?
For an evolving product, yes: it halves future change time and guarantees consistency. For a frozen brochure site, it is optional. It is a 5,000-12,000 EUR investment that pays off over time.
How do I measure redesign ROI?
On three metrics: activation rate, support ticket volume and churn rate. A structural redesign typically targets +10-20 % activation and -15-25 % tickets, measurable via A/B or before/after.
Cosmetic or structural: how to decide?
Look at the root cause. Dated image without usage friction: cosmetic. Lost users, abandoned onboarding, flooded support: structural. The first costs 6-14k EUR, the second 18-30k EUR.
How long does a redesign take?
Expect 4-7 weeks for a cosmetic redesign and 8-14 weeks for a structural one with user testing, a design system and accessible front-end integration.
Let's scope your project. Send your current metrics (activation, churn, tickets) and key screens, and we will price the audit (2.5-6k EUR) and redesign (12-30k EUR) with a target ROI. 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.
