Engineering services: test billable work and pass-throughs
Engineering-services revenue can grow because professionals perform more work, rates improve, or more subcontractor and reimbursable spending passes through the company. These mechanisms have different implications for staffing and retained contribution. Examine the work actually performed before using revenue per employee as a productivity measure.
Anchor the service-revenue boundary
AECOM reconciles reported revenue to net service revenue by deducting pass-through revenue in its results materials. That analytical measure follows the company’s definition. It does not establish that all pass-through revenue has zero cost risk, nor does it replace reported revenue under the applicable accounting framework.
For a research model, separate internal professional services, subcontracted work and reimbursable client expenses. A large construction-management project can increase purchased services substantially. Dividing the resulting total revenue by the engineering workforce would make productivity appear to improve even if internal professional output was unchanged.
A hypothetical billable-hours model
Assume a fictional consultancy has 100 professionals, each with 1,800 working hours during the year. Of the 180,000 total hours, 126,000 are billable, giving 70% utilization. At realized service revenue of 150 per billable hour, internal service revenue is 18.9 million.
| Hypothetical activity | Calculation | Amount |
|---|---|---|
| Total professional hours | 100 × 1,800 | 180,000 |
| Billable hours | 180,000 × 70% | 126,000 |
| Internal service revenue | 126,000 × 150 | 18.9 million |
| Pass-through revenue | Assumed separately | 11.1 million |
| Reported revenue in this simplified case | 18.9 + 11.1 | 30 million |
Next year pass-through revenue rises to 16.1 million, while professionals, hours and internal service revenue remain unchanged. Total revenue becomes 35 million, a 16.67% increase. Revenue per professional rises from 300,000 to 350,000, but the internal-work productivity hypothesis has received no support.
Rates, utilization and realization are different
If utilization increases from 70% to 75% at the same realized rate, billable hours become 135,000 and internal revenue becomes 20.25 million. This is 1.35 million of additional service revenue. It does not mean profit rises by the same amount: overtime, bonuses or extra support can absorb part of the gain.
A billing rate also differs from realized revenue per billable hour. Fixed-price projects, discounts, write-offs and unapproved change orders can prevent hours from converting into revenue at the posted rate. Preserve unpaid rework and scope changes rather than labeling all professional time productive simply because it was recorded against a client project.
Test delivery quality alongside efficiency
Review when utilization rises while rework, staff departures or project overruns increase. A very high short-term utilization level can reduce time available for training, proposals and quality control. Conversely, lower utilization during recruitment or project mobilization need not indicate permanently weak demand.
Create a panel with average professionals, working-hour definition, billable hours, realized service rate, subcontracting, reimbursables and project write-offs. Check whether employee counts include administrative staff and whether overseas delivery centers follow the same hour conventions. Public disclosures often cannot reproduce the full model; identify the missing fields rather than treating a group headcount as an exact professional denominator.
This worksheet tests the relationship between labor input, client delivery and retained service revenue. It does not resolve principal-versus-agent accounting, prove engineering quality, or establish the investment value of a consultancy. Those require separate evidence and judgments.
Consider the staffing pipeline behind the utilization ratio. Winning a project does not mean the required specialties are already available, and hiring ahead of delivery can lower utilization temporarily. Conversely, leaving key roles vacant can lift work intensity among remaining staff while limiting the ability to accept new projects. Record the skill category and mobilization date rather than assuming that every professional hour is interchangeable. This prevents a group-level headcount calculation from concealing a project-specific bottleneck.
FAQ
Does higher net service revenue per employee prove better productivity?
Only after matching the employee population, subcontracting boundary and service mix. Rate increases alone can raise the ratio without more output.
Is maximum utilization always the objective?
No. Sustainable delivery also requires quality control, training and business development. Assess the operational consequences rather than selecting a universal utilization target.