The verdict in three sentences
Application maintenance for a business app runs, as a 2026 order of magnitude, at 15 to 25% of the initial build cost per year, excluding hosting. That budget splits between corrective, evolutive and security work, with dependency updates at least quarterly. A CFO who budgets it from year one avoids the app that quietly decays and then needs a full rebuild after 3 to 4 years.
How much to budget: the 15 to 25% rule
The percentage depends on how critical the tool is and how fast the business changes. A stable internal management app stays around 15%; a platform connected to mobile payments or external APIs moves towards 25%.
| Initial build cost | Low maintenance (15%) | High maintenance (25%) | Monthly equivalent |
|---|---|---|---|
| 3,000,000 FCFA (4,570 EUR) | 450,000 FCFA | 750,000 FCFA | 37,500 to 62,500 FCFA |
| 5,000,000 FCFA (7,620 EUR) | 750,000 FCFA | 1,250,000 FCFA | 62,500 to 104,000 FCFA |
| 8,000,000 FCFA (12,200 EUR) | 1,200,000 FCFA | 2,000,000 FCFA | 100,000 to 167,000 FCFA |
| 12,000,000 FCFA (18,290 EUR) | 1,800,000 FCFA | 3,000,000 FCFA | 150,000 to 250,000 FCFA |
| 20,000,000 FCFA (30,490 EUR) | 3,000,000 FCFA | 5,000,000 FCFA | 250,000 to 417,000 FCFA |
These are 2026 market estimates for francophone West Africa. In Western Europe, maintenance retainers for business apps typically range from 1,000 to 5,000 EUR a month, because build costs and day rates are higher, but the 15 to 25% ratio holds. Figures exclude hosting, third-party licences (SMS, emailing, maps) and payment provider fees.
Budget split: corrective, evolutive, security
| Item | Share of maintenance budget | Content | Frequency |
|---|---|---|---|
| Corrective maintenance | 20 to 30% | Bug fixes, production incidents | Ongoing, response time by severity |
| Evolutive maintenance | 40 to 55% | New features, adapting to business or tax rules | Quarterly lots |
| Security and dependencies | 15 to 25% | Framework and library updates, vulnerability patches | At least quarterly, immediately for critical flaws |
| Monitoring and backups | 5 to 10% | Uptime monitoring, restore tests | Monthly |
| User support | 5 to 10% | Questions, short training | On demand |
Security is the line budgets forget most often. An app whose dependencies have not been updated for 18 months often carries dozens of known vulnerabilities, and catching up then costs several times the price of regular upkeep.
Monthly plan or pay per ticket?
A maintenance plan smooths spending and guarantees baseline upkeep. Major enhancements are quoted separately. For reference, Kolonell's 2026 maintenance plans are as follows (Kolonell's own pricing, distinct from the market percentages above):
| Kolonell plan | Monthly price | Annual price | Hosting |
|---|---|---|---|
| Basic | 35,000 FCFA (50 EUR) | 420,000 FCFA | Extra |
| Standard | 75,000 FCFA (110 EUR) | 900,000 FCFA | Extra |
| Premium | 120,000 FCFA (180 EUR) | 1,440,000 FCFA | Extra |
| Managed hosting | 25,000 to 75,000 FCFA (40 to 110 EUR) | 300,000 to 900,000 FCFA | Depends on load |
A realistic annual budget therefore combines a maintenance plan, an evolutive envelope and hosting.
Mini case study
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Aminata, CFO of a logistics company in Dakar, must budget maintenance for a delivery tracking app delivered last year for 8,000,000 FCFA. Market range: 1,200,000 to 2,000,000 FCFA a year. Illustrative build-up: Standard plan at 75,000 FCFA a month, or 900,000 FCFA, plus an evolutive envelope of 600,000 FCFA for two quarterly lots, totalling 1,500,000 FCFA (18.75% of the build cost). She adds hosting at 40,000 FCFA a month, or 480,000 FCFA. Total budgeted: 1,980,000 FCFA, about 3,020 EUR.
FAQ
What percentage of build cost should I plan for maintenance?
As a 2026 order of magnitude, 15 to 25% a year, excluding hosting. An app built for 5,000,000 FCFA therefore needs 750,000 to 1,250,000 FCFA a year.
Is hosting included in maintenance?
Rarely. Budget it separately, for example 25,000 to 75,000 FCFA a month for managed hosting depending on load.
How often should dependencies be updated?
At least quarterly, and immediately when a critical vulnerability is published. This item accounts for 15 to 25% of the maintenance budget.
What happens if no maintenance is budgeted?
The app runs for a few months, then incidents and vulnerabilities pile up. After 3 to 4 years, a rebuild can cost 60 to 100% of the original price.
What do maintenance retainers cost in Europe?
For a business app, typically 1,000 to 5,000 EUR a month in 2026, depending on scope and response times. The 15 to 25% ratio of build cost is a good sanity check.
Let's scope your project. Send us your app's description and history: we propose the right maintenance plan, an evolutive envelope and a full annual budget including hosting. 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.
