The verdict in three sentences
A delivered app is not finished: it lives, updates and gets corrected. In 2026, application maintenance runs 10 to 20% of development cost per year, i.e. EUR 6,000-12,000 for a EUR 60,000 app. Skipping the budget multiplies corrective costs by 2 to 3 and exposes you to security flaws.
What maintenance covers and what it costs
Maintenance is not just breakdown insurance: it includes security, dependency upgrades and small enhancements that keep the tool aligned with the business.
| Maintenance item (2026 order of magnitude) | Contents | Share of annual cost |
|---|---|---|
| Fixes (bugs) | Blocking and minor anomalies | 20-30% |
| Security | Patches, dependencies, audits | 20-30% |
| Version upgrades | Framework, libraries, OS | 15-25% |
| Minor enhancements | Small business adjustments | 20-30% |
| Monitoring / supervision | Alerts, availability | 10-15% |
No maintenance vs SLA: the real trade-off
Ad hoc maintenance costs less but lets incidents pile up. A contract with an SLA (guaranteed recovery time) costs more but prices the downtime risk.
| Plan (2026 order of magnitude) | Annual cost (EUR 60,000 app) | Recovery time | Risk |
|---|---|---|---|
| No maintenance | EUR 0 on paper | not guaranteed | high (costs x2-3) |
| Hourly-block maintenance | EUR 4,000-7,000 | 2-5 days | moderate |
| Standard maintenance | EUR 6,000-12,000 | < 24-48 h | controlled |
| Maintenance with SLA | EUR 9,000-16,000 | < 4 h | low |
| 24/7 on-call | +30-50% | < 1-2 h | very low |
Mini case study
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Thomas, IT director in Amsterdam, runs a EUR 60,000 management app used by 40 people. Without maintenance, a half-day blocking outage costs 40 x 0.5 day x EUR 300 = EUR 6,000 in lost productivity, and he suffers 3-4 per year, i.e. EUR 18,000-24,000. An SLA contract at EUR 12,000/year brings those incidents under an hour and cuts their cost fivefold. Net: about EUR 14,000/year saved, not counting reduced security-breach risk. He picks the SLA without 24/7 on-call, as his operation runs in business hours.
FAQ
Why isn't maintenance optional? Because an unmaintained app accumulates technical debt and security flaws. Deferred fixes cost 2 to 3 times more than regular maintenance, and one breach can halt operations.
What is the difference between standard maintenance and SLA? An SLA guarantees a contractual recovery time (for example under 4 h). It costs 20-40% more but turns an uncontrolled risk into a predictable cost.
Do I need 24/7 on-call? Only if your operation runs outside business hours (e-commerce, logistics, healthcare). It adds 30-50% to the maintenance cost. Otherwise, a business-hours SLA is enough.
Can we bring maintenance in-house later? Yes, if you hire a developer who masters the stack and you keep up-to-date documentation. Many SMBs prefer outsourcing until the internal team is sized.
How can we reduce maintenance cost? Investing in automated tests and good documentation during development reduces the volume of fixes. Clean architecture durably lowers the security and upgrade share.
Let's scope your project. Tell us your app's value, user count and downtime tolerance, and we will size the right maintenance and SLA. 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.
