Agile Fixed Price: Planning Security Without Waterfall Model
Last updated: March 2026 · Reading time: 6 minutes
"What does the project cost?" is the first question. "What exactly do you want?" is the right counter-question. The problem: in complex Drupal projects, requirements cannot be fully specified before the project starts. The traditional fixed price forces both sides into a corset that does not fit.
The agile fixed price solves this dilemma. The budget is fixed. The requirements are refined and prioritized during the project.
Traditional Fixed Price vs. Agile Fixed Price
The traditional fixed price works with clearly defined requirements. If you know exactly what you need and nothing changes during implementation, a fixed price is efficient. In practice, something almost always changes in Drupal projects.
The traditional fixed price responds to changes with change requests, renegotiations, and delays. The vendor calculates a risk buffer that the client pays for.
The agile fixed price defines a budget framework and scope at an abstraction level (epics). Development proceeds in prioritized sprints. After each sprint, the client decides whether the direction is right and what gets implemented next.
Changes are not a contract problem but the norm. What changes is traded against equivalent requirements. The budget stays the same, the scope becomes optimal.
How the Agile Fixed Price Works at arocom
Step 1 — Scoping: In a joint workshop, we develop the main goals and requirements at the epic level. We estimate effort and define the budget framework.
Step 2 — Test sprints: 2-3 sprints in which both sides test the collaboration. The result: first functional deliverables and a validated effort estimate.
Step 3 — Binding framework: Based on the test sprints, the fixed price framework is contractually established. Both sides now know what is realistic.
Step 4 — Implementation in sprints: Prioritized development with sprint reviews. The client has a functional product and budget control after each sprint.
This model requires trust. In over 160 Drupal projects since 2012, arocom has shown that this trust is justified. No risk buffer at the client's expense, no hidden effort.
Your next step
Planning a Drupal project and want to combine budget certainty with flexibility? Start with the Drupal Future Check — it gives you the foundation for a realistic effort estimate.
Is the agile fixed price more expensive than a traditional fixed price?
No. With the traditional fixed price, the vendor calculates a risk buffer. With the agile fixed price, this buffer is eliminated because risks are reduced through close collaboration and regular adjustments. The end result better matches what you actually need.
What happens when the budget is used up but features are missing?
Through continuous prioritization, the most important features are implemented first. After each sprint, you have a functional product. When the budget is used up, the least important features are missing — not the critical ones.
For which project size is the agile fixed price suited?
For complex projects from approximately 30,000 euros. For smaller projects with clear requirements, a traditional fixed price is more efficient. arocom advises you on the right model in the initial consultation.
Read more
- Scrum in Drupal Projects — The methodology behind the agile fixed price
- Project Management for Web Projects — What we learned in 160+ Drupal projects
- Planning a Website Relaunch — The arocom guide
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