WHY PROFITABLE ESTIMATES FAIL — FIVE ERRORS THAT LOCK IN LOSSES BEFORE MOBILIZATION.
A job that closes below expectations almost always traces back to an estimate error — not a field execution problem. The overhead rate was understated. The labor burden was wrong. The production rate was optimistic and not validated against documented historical data. Indirect labor was missing. General conditions were underbid. Each of those errors is a locked-in loss before the first employee shows up on site. Understanding them is the first step. Building the financial infrastructure to prevent them is the second.
SPM corrects estimate accuracy by building the financial control system that produces the data estimates should be built on: documented unit costs from completed projects, a formally calculated overhead rate, and an alignment meeting that maps every estimate line to a job cost code before mobilization.
WHY WINNING THE BID DOES NOT MEAN WINNING THE JOB FINANCIALLY.
Overhead Rate Applied at Bid Time Is Not the Real Rate
The most common estimate failure is an overhead rate that understates the real cost of running the business. An estimator who applies 10% overhead when the real rate is 17% has already built a 7-point loss into every project before a shovel hits the ground. The bid wins because it is competitively priced — relative to other contractors who are also underpricing overhead. The job closes below expectations because $70,000 in overhead on a $1M project was never recovered. The fix is a formally calculated overhead rate that is recalculated annually and updated any time a significant overhead item changes.
Labor Burden Rate Understated or Inconsistent
Most construction estimators use a labor burden rate to convert base wage to fully burdened cost. When that burden rate is outdated, inconsistently applied, or simply wrong, every labor estimate in the bid is wrong by the corresponding percentage. A burden rate of 35% applied to a foreman earning $32/hour produces an estimate of $43.20/hour. The real burden — including workers comp at the correct class code, health insurance, 401k, and payroll taxes — may be $46.50/hour. On 1,200 foreman hours in a project, that $3.30 difference is $3,960 in unrecovered labor burden. Multiply across all labor categories and the gap becomes significant.
Production Rate Assumptions Not Validated Against Historical Data
An estimate is a production rate assumption: this task will take X hours per unit. When that assumption is based on memory, industry averages, or optimistic expectations rather than documented historical performance data, the estimate is a guess. A grading contractor who estimates 85 CY/hour for a dozer on a site they have not worked before, based on performance on a different site type, may find the actual rate is 62 CY/hour. The labor overrun that results was built into the estimate before mobilization. The fix is unit cost tracking from completed projects — actual production rates by work type, by crew composition, by season — as the input to future estimates.
Indirect Labor Not in the Estimate
Superintendent time, foreman coordination, PM meetings, submittal preparation, safety officer visits — none of these are installing anything, and all of them cost real money. When indirect labor is not in the estimate as a named direct job expense line, the job will be over budget on labor from day one — not because the crew is inefficient, but because the estimate never included the people supporting the crew. A 6-month project with a full-time superintendent at $85K/year carries $42,500 in superintendent cost that should be in the estimate. If it is not, the project loses $42,500 before the first pour.
General Conditions and Mobilization Estimated at Zero or Minimum
General conditions — temporary power, site office, porta-potties, fencing, dumpsters, site cleanup — and mobilization costs are frequently underestimated because they feel like rounding items. On a 6-month $800K project, general conditions run 2–5% of contract value — $16,000–$40,000. When they are estimated at $5,000, the first month burns the entire general conditions budget and every subsequent month of site overhead comes from project margin.
WHAT AN ACCURATE ESTIMATE REQUIRES — NOT WHAT MOST CONTRACTORS HAVE.
The alignment meeting: A well-built estimate does not produce job profitability on its own. The estimate has to align to the job cost code structure so actual costs can be compared to estimated costs at the phase and category level. The alignment meeting — where the estimator, bookkeeper, and PM walk the estimate line by line and map every item to a job cost code — is the step that connects the bid to the financial control system.
FREQUENTLY ASKED.
