How to estimate software development budget: cost drivers and common mistakes
A simple estimation model: scope, risks, quality, security, and support. What to ask a vendor to keep delivery predictable.
Published
2026-03-16
What drives cost
Scope and requirements uncertainty (backlog and acceptance criteria).
Architecture and integrations (data complexity, external systems, load).
Quality: testing, documentation, maintainability, security.
Ops: environments, monitoring, backups, updates.
Common estimation mistakes
Comparing only 'price per feature' and ignoring quality and operations.
Not defining a clear Definition of Done and acceptance criteria.
Leaving security to the end and then reworking large parts of the system.
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