Staff Utilization & Chargeable Ratios

Staff utilization and chargeable ratios

Utilization measures the portion of recorded staff time assigned to direct project work. It helps a manager compare planned resources with actual assignments, but it does not show whether the work was productive, collected, or profitable. A fixed-fee project can have high direct hours and still lose money if it requires substantial rework. Conversely, a principal can have lower utilization while performing necessary business development. The measurement is useful only when its numerator, denominator, and purpose are clear.

Define the time basis first

A common hours-based calculation divides direct project hours by total recorded hours. Some firms include paid leave and holidays in the denominator; others report working-hours utilization separately. A scenario must state its convention. When comparing employees or periods, use the same convention. Do not subtract leave and then apply a target defined on all paid hours, because that reduces capacity twice.

$$\text{Hours utilization}=\frac{\text{Direct project hours}}{\text{Total recorded hours}}\times100\%$$

Suppose a project architect records 80 hours during two weeks: 64 hours on contracted projects, six on firm administration, six on general continuing education, and four on a pursuit. The direct-project utilization is 64/80, or 80%. If the same person records ten hours of paid leave in a later period, whether that leave enters the denominator depends on the stated reporting policy. It does not become a direct project hour merely because the firm pays for it.

“Chargeable” and “invoiced” are related but different. Direct time may be assigned to a fixed-fee project without appearing as a separate hourly invoice. Write-offs, contractual billing limits, and collection failures can reduce realized revenue even though direct hours remain in the project ledger. Code time honestly rather than moving over-budget hours to overhead to make a project appear profitable.

Direct work includes review and management

Project-specific coordination meetings, code research, QA/QC reviews, and consultant management can be direct project activities. They are not automatically overhead or nonbillable. Whether they are separately invoiced depends on the fee arrangement. A review of this project's curtain-wall details belongs to this project's effort; development of a firmwide detail library may be indirect practice work.

This distinction matters when assigning staff. Removing review hours from the work plan to achieve a high production ratio understates the real cost of delivery. Budget for the responsible professional's review, consultant coordination, and back-checking. Staff production without adequate review can create rework, but a high utilization percentage alone does not establish that reviews were skipped or that anyone worked overtime.

Compare capacity with assignments

Assume a 40-hour week and a project architect's illustrative direct-project target of 80%. The expected chargeable capacity is 32 hours. Two projects request 24 and 18 hours, for a total of 42. That is ten hours above the planned direct capacity and two hours above the entire normal workweek. The manager should examine dates and skills before accepting the assignments.

Options include moving noncritical tasks, assigning qualified assistance, reducing unnecessary work, negotiating a milestone, or approving limited overtime when appropriate. Simply adding a junior designer may not replace a senior technical review. Capacity is a combination of available time and competence, not a headcount total. Document assumptions about leave, existing assignments, and onboarding effort.

A portfolio forecast should show project, phase, employee, required skill, and expected hours by week. Revisit it when an owner review is delayed or a permit correction changes production effort. An apparent idle week may actually be reserved for a known consultant submission; an apparent overload may disappear if a predecessor approval moves. Coordinate the forecast with the current project schedule.

Dollar-based utilization

A separate financial measure divides direct labor cost by total labor cost. It weights employees according to compensation, so it is not generally equal to an unweighted average of individual utilization percentages.

$$\text{Dollar utilization}=\frac{\text{Direct labor cost}}{\text{Total labor cost}}\times100\%$$

For example, employee A earns an assumed direct salary rate of $40 per hour and employee B $25. Each records 40 hours. A has 20 direct hours and B has 32. Total direct cost is 20×40 + 32×25 = $1,600. Total labor cost is 40×40 + 40×25 = $2,600. Dollar utilization is 61.54%. Hours utilization is 52/80 = 65%. Both calculations are correct; they answer different questions.

Keep salary costs separate from billing rates in this calculation. Billing rates include recovery of overhead and planned profit, while salary rates measure labor expense. Mixing the two can make a comparison look more favorable without changing the underlying resources.

Interpret trends before acting

Low utilization can reflect insufficient assignments, a temporary pause, necessary training, or a senior employee's business responsibilities. Investigate the cause and future workload before cutting staffing. High utilization may reflect efficient delivery, overload, or extensive project rework. Pair the ratio with remaining fee, progress, overtime, quality findings, and turnover information.

Role-based targets are firm planning assumptions, not NCARB or AIA requirements. A principal with substantial pursuit duties needs a different allocation than a designer working mainly on commissioned projects. An illustrative target cannot justify billing unrelated activity to a client. Likewise, an annual target does not imply the same percentage every week: project milestones and holidays produce variation.

A management decision

A PM reports 90% utilization while its project is only 50% complete and 75% of the labor allowance has been spent. The utilization figure alone sounds strong, but the project forecast signals a problem. Review the remaining work, identify unapproved additions or rework, and update the estimate to complete. Determine whether scope authorization, staffing changes, or process corrections are needed. Increasing utilization without changing the work requirement will not restore the fee allowance. The most useful resource decision combines honest time records, a realistic forecast, and the required quality reviews.

Utilization classification check