Estimating engineering and PMC services is a different discipline to estimating construction. The unit of work is a deliverable — a drawing, a calculation, a specification — and the unit of cost is a role-hour. The tool that ties the two together is the CTR (Cost, Time, Resource) sheet.
A CTR is the smallest auditable unit of a professional-services estimate. It defines a single scope of work — typically a discipline package, a study, or a phase — and answers four questions in one place:
Auditable — every dollar traces back to a role, an hour and a deliverable.
Comparable — two CTRs for similar scopes can be benchmarked against each other.
Progressable — the same deliverable list becomes the progress measurement system on day one of execution.
Defensible — when a client pushes back on hours, the conversation is at the deliverable level.
Whether the estimate is for a 200-hour study or a 200,000-hour FEED, the build-up shape is the same. The estimator works from scope outwards, never from a total inwards.
Not every CTR needs a full per-person matrix. Early studies and small scopes are best estimated as a bucket of hours. Larger execution scopes need the per-person view.
One bucket of hours assigned to a single role. Fast to build, easy to defend.
Best for studies, options assessments, FEL-1/2 deliverables.
Per-person hours per deliverable, costed at the effective bill rate.
Best for FEL-3 / EPCM execution.
AACE International publishes the Recommended Practices for cost engineering, schedule levels of detail and integrated cost/schedule control. CII (Construction Industry Institute) publishes the empirical research on engineering productivity that underpins how CTR hours are calibrated against history.
CTR-IQ turns this discipline into a working tool — projects, role-based rates, deliverable lists, and a Simple/Complex toggle per CTR.