How to set project budgets that actually work
Jens DeryckereFebruary 26, 20268 min read
Why most budgets fail
Every agency has a graveyard of projects that went over budget, and in most cases the root cause wasn't poor execution — it was poor budgeting. Setting a project budget by gut feel, copying last year's numbers, or simply accepting whatever the client's willing to pay is a recipe for margin erosion. Effective budgeting requires a disciplined approach that combines historical data, realistic task-level estimation, and explicit contingency planning. It's not glamorous work, but it's the foundation of a profitable agency.
Start with historical data
Start with historical data. If you've completed similar projects before, your past time logs are the most reliable predictor of future effort. Look at actual hours by role and phase, not the original estimates. Most agencies find that certain phases — client revisions, QA, and project management overhead — are systematically underestimated. Building a library of reference projects with actual-versus-estimated breakdowns gives you a reality-checked baseline that takes the guesswork out of new proposals.
Break down by phase
Layer in a phase-by-phase breakdown with explicit assumptions. Rather than quoting a flat number of hours for 'design,' break it into concept development, internal review, client presentation, and revision rounds. Attach a specific assumption to each line item — for example, 'two rounds of revisions with consolidated feedback.' When scope inevitably shifts, you'll have a documented basis for the original budget that makes change order conversations straightforward rather than adversarial.
Build in structured contingency
Finally, build in structured contingency. A blanket 10 percent buffer on the total budget is better than nothing, but it's far less effective than allocating contingency to the phases where risk is highest. If discovery work with a new client typically runs 30 percent over estimate, put the buffer there. If production is usually predictable, keep that contingency lean. This targeted approach gives you a realistic total budget while protecting the areas most likely to surprise you.
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