Monthly Maintenance Costs and SLA Standards -- What Is the Right Amount?
A practical guide to maintenance cost estimation criteria and SLA (Service Level Agreement) items for post-development software outsourcing.
- •Maintenance costs average 10-20% of initial development costs per year in the industry.
- •SLAs are defined based on incident response time, uptime, and backup frequency.
- •Clearly distinguishing maintenance scope (bug fixes vs. feature additions) is essential to prevent disputes.
Maintenance Cost Estimation Criteria
Option 1: Monthly Fixed Fee
Small scale (basic operations): $400-$800/month
Medium scale (including feature modifications): $800-$2,500/month
Large scale (dedicated personnel): $2,500-$6,500/month
Option 2: Annual Percentage
Maintenance costs are calculated as 10-20% of the initial development cost per year.
Example: Development cost of $25K results in maintenance of $2,500-$5,000/year ($200-$400/month)
Option 3: Time & Materials (T&M)
Billed at $40-$120/hour for actual hours worked.
Suitable for small-scale projects with low maintenance frequency.
Core SLA Items
| Item | Basic | Premium |
|---|---|---|
| Incident Response Time | Within 24 hours | Within 4 hours |
| Service Uptime | 99% | 99.9% |
| Backup Frequency | Once daily | Real-time |
| Monitoring | Manual checks | 24/7 automated |
| Monthly Work Hours | 8 hours | 40 hours |
| Emergency Deployment | Within business day | Same day |
Maintenance Scope Definitions
Included (Typical)
Server monitoring and incident response
Bug fixes (vendor's responsibility)
Security patches and library updates
Data backup and recovery
Minor UI modifications
Not Included (Separate Quotation)
New feature development
Major design changes
Server scaling/migration
Additional external integrations
Performance optimization (large-scale)
If this distinction is not specified in the contract, disputes over "Isn't this covered under maintenance?" will inevitably arise.
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