Ask an agency owner what a designer costs and you get a salary. Ask what an hour of that designer costs to sell and the answer takes longer, because the honest version requires dividing by a number nobody likes looking at.
That number is utilisation: the share of paid days that end up on billable work. Across small and mid-sized agencies it lands between 60% and 75%. Not because people are lazy — because work does not arrive in a smooth stream.
Where the missing 30% goes
- Gaps between projects. A client approves three days late, the next brief is not ready, and two days evaporate.
- Rework nobody quotes for. Revision rounds beyond the estimate, fixes after handover, the small favour that keeps the client happy.
- Internal work. Your own website, pitch decks, case studies, onboarding a new hire.
- Shape mismatch. The month needs two developers and one designer. You employ one developer and two designers.
The last one is the expensive one, and it is structural. You hire for an average month, then live through months that look nothing like the average.
A specialist at 70% utilisation costs you roughly 43% more per billable day than their salary suggests. Most delivery pricing quietly ignores this.
Run the number on your own team
It takes ten minutes and it is uncomfortable in a useful way:
- Take one delivery person. Add salary, employer taxes, software, and their share of overhead. Divide by twelve.
- Count the working days in a month — roughly 21 after holidays.
- Pull the last three months of timesheets or project logs and count the days that were genuinely billable.
- Divide the monthly cost by the billable days, not by 21.
Most agencies discover their real cost per billable day is 30–50% higher than the figure they have been using to price retainers.
The three ways out
Raise utilisation
Better forecasting, tighter briefs, staggered start dates. Worth doing, and it has a ceiling: no agency below about forty people gets a small team past the mid-eighties without burning it out.
Make the team smaller than peak demand
Staff for your quiet months rather than your busy ones, and buy the difference from outside. This is the strategy most profitable agencies converge on, and it only works if the outside capacity is actually reliable.
Move the risk off your balance sheet
A capacity retainer with a delivery partner inverts the problem. You pay for a block of specialist days and use them or lose them within a rollover cap. Their utilisation is their concern, because they are spreading the same people across several partners.
A healthy structure is a small in-house core at high utilisation covering the work that defines you, plus external capacity absorbing the peaks and the shape mismatches. The core stays busy because the overflow has somewhere else to go.
The uncomfortable conclusion
If your delivery team is 70% utilised, roughly three months of every working year are paid for and not sold. You can improve that by a few points with better process. You can fix it structurally by owning less capacity and renting the variable part.
Either way, the first step is the same: stop pricing against salaries and start pricing against billable days. Everything else follows from that one number.
