Fixed-price projects are appealing for an obvious reason: you know what you're spending. There's a number, you agree to it, and the project either comes in at that number or it doesn't. For businesses that need to plan budgets carefully, that certainty matters.
But the way most agencies price fixed-scope work creates a different kind of risk that doesn't always get named upfront.
When an agency commits to a fixed price, they're pricing in uncertainty. They don't know exactly how long things will take, how complex the edge cases will be, or what they'll find once they start building. So they add a buffer. And because they're bearing the risk of overrun, they also have an incentive to stick tightly to spec and resist anything that wasn't explicitly agreed — even when a small change would clearly make the end product better.
What you often end up with is something that's technically on budget but slightly less good than it could have been, because nobody wanted to open the scope conversation.
We use fixed-price engagements in specific situations — usually when the scope is genuinely well-defined and unlikely to shift. When the spec has been done properly and both sides understand exactly what's being built, fixed-price works well. The risk is low because the uncertainty is low.
For larger or more complex projects, we're more likely to work on a time-and-materials basis with clear milestones and a defined review process. That approach is less immediately comfortable because the final number isn't locked in upfront, but it's more honest — it doesn't force either side to pretend there's more certainty than there actually is.
The conversation we try to have early on is about which model actually fits the project. Not which one is more reassuring on paper. Because a fixed price that doesn't reflect real scope isn't certainty — it's a deferred negotiation.