StackLift AI
All comparisons

Fixed-Scope vs Hourly Billing

Hourly billing pays for time; fixed-scope pays for outcomes. The model you choose changes who carries the risk of slow or padded work.

Dimension
Fixed-scope (story points)
Hourly / time-and-materials
Budget certainty
Known up front
Open-ended
Risk owner
Delivery partner
You (the client)
Incentive
Ship the agreed scope efficiently
More hours = more revenue
Change handling
Explicit, priced change requests
Absorbed into hours
Best for
Defined builds with clear scope
Pure R&D with unknown direction

The verdict

Fixed-scope protects your budget and aligns incentives for most builds - you know the number and the partner is motivated to deliver efficiently. Hourly only makes sense for genuinely exploratory work where scope can't be defined yet.

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Frequently asked questions

What happens when scope changes under fixed-scope?

It becomes an explicit, priced change request against the original baseline - transparent, not hidden in a growing invoice.

How is fixed-scope priced fairly?

Via story points tied to deliverable complexity, set after an AI scope and senior-architect review - so the number reflects real work, not guesswork.