The verdict in three sentences
Application maintenance (TMA / ongoing support) costs, in 2026, between 15 and 25 % of the initial development budget per year: an app delivered for 50,000 EUR generates 7,500 to 12,500 EUR of annual maintenance. That budget covers four distinct areas — corrective, evolutive, security, hosting — governed by an SLA that sets recovery times. Provisioning nothing means paying later: untreated technical debt doubles remediation costs within 24 to 36 months.
The four maintenance areas and their 2026 budgets
Serious maintenance breaks down into parts. Blurring them is the top cause of unreadable quotes. Here is the 2026 order of magnitude for a mid-sized business application (based on a 50,000 EUR build).
| Area | What it covers | Share of budget | Annual cost (50,000 EUR base) |
|---|---|---|---|
| Corrective | Bugs, regressions, production incidents | 20-30 % | 2,000 - 3,500 EUR |
| Evolutive | Small features, business tweaks | 30-40 % | 3,000 - 4,500 EUR |
| Security & updates | Patches, dependencies, CVEs, GDPR | 15-25 % | 1,500 - 2,500 EUR |
| Hosting & infra | Cloud, backups, monitoring, CDN | 15-20 % | 1,200 - 2,400 EUR |
| Total maintenance | 100 % | 7,700 - 12,900 EUR |
Figures vary with criticality: a fault-tolerant internal app trends toward 15 %, a revenue-generating customer platform toward 25 % or more if it demands a 24/7 SLA.
Fixed hours, time-and-materials, or SLA: which contract
The contract model changes everything. Here are the three standard formats on the 2026 market.
| Model | Indicative 2026 price | Upside | Risk |
|---|---|---|---|
| Fixed hours (e.g. 10 h/month) | 800 - 1,500 EUR/month | Predictable budget | Unused hours lost |
| Time-and-materials | Day rate 450 - 700 EUR | Full flexibility | Budget overruns |
| Guaranteed SLA | 1,200 - 3,000 EUR/month | Committed recovery time | Higher base cost |
The SLA deserves surgical attention. A 4-business-hour recovery guarantee for a critical incident is nothing like a 2-hour 24/7 guarantee. Late penalties, expressed as a percentage of the monthly fee, must be spelled out: a solid 2026 contract sets 5 to 10 % credit per delay tier.
The hidden cost: no maintenance
Not maintaining is not free — it is a loan at usurious rates. Every month without security updates widens the attack surface; every frozen dependency ages; every business workaround bloats the code. After 2 to 3 years, an unmaintained app requires a heavy overhaul that often costs more than a partial rebuild.
Mini case study
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Claire, IT director of a Paris services SME, had a case-management application delivered for 60,000 EUR. She hesitated to sign a maintenance contract. Simulation: without maintenance, two major incidents in 18 months cost her 9,000 EUR in emergency time-and-materials fixes (day rate 650 EUR), plus 3 days of downtime estimated at 12,000 EUR of lost business. With a 20 % maintenance plan (12,000 EUR/year) and a 4-hour SLA, the same incidents would have been resolved in hours, not days. Over 18 months: 21,000 EUR of avoidable loss versus 18,000 EUR of maintenance. Maintenance pays for itself at the first serious incident.
FAQ
Is maintenance mandatory after delivery?
No, but skipping it is a risky bet. In practice, over 80 % of business applications delivered in 2026 are covered by a contract, because a single costly day of downtime exceeds several months of maintenance.
How much for maintaining a small 20,000 EUR app?
Budget 3,000 to 5,000 EUR per year (15-25 %). For that budget, a fixed plan of 8 to 10 monthly hours is usually preferred over a guaranteed SLA, which suits larger systems.
Can I switch providers for maintenance?
Yes, provided you own the source code and have up-to-date documentation. Plan a handover phase (audit + transfer) of 3,000 to 8,000 EUR depending on legacy complexity.
What exactly does a 4-hour SLA cover?
It guarantees that a declared critical incident is taken up and restored within 4 business hours. Minor incidents fall under a longer window (24 to 48 h), and penalties apply if the provider misses the commitment.
Is security included in the base maintenance plan?
Not always — check it. Dependency patches and CVE monitoring represent 15 to 25 % of the budget; a contract that excludes them exposes you to vulnerabilities and expensive catch-up costs.
Let's scope your project. Describe your application (stack, criticality, user volume) and we will price a maintenance plan that fits, from an 8-hour package to a 24/7 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.
