Bridgit’s first-ever Construction Workforce Benchmark Report drops a number the industry has been operating on without measuring: the average project team is 36.4% rookies, climbing to roughly 56% on teams of 51 or more. With 41% of the construction workforce projected to retire by 2031 and median attrition sitting at 18.7%, the rookie ratio is fast becoming a planning input contractors can no longer afford to track on instinct. Here is what the number actually means, how to start measuring it, and what to do once you can see it.
For decades, the experience mix on a construction project team was something senior leaders carried in their heads. You looked at the staffing sheet, you knew who was new, you trusted that your seasoned supers would carry the weight. That worked when retirements were spaced out and the labor market was forgiving.
Neither of those conditions is true anymore. 41% of the current construction workforce is projected to retire by 2031, according to the National Center for Construction Education and Research. Average tenure in the industry sits at just 3.9 years. The seasoned superintendent who anchored your last three jobs probably has a replacement on paper, but not in practice.
That is the gap Bridgit’s 2026 Construction Workforce Benchmark Report is built to expose. Drawing on data from 233 contractors and over 114,000 professionals, roughly 40% of the ENR 400, it puts a number on something the industry has been guessing at: how much of your project team is new. The answer, on average, is 36.4%. On the biggest jobs, it is closer to 56%.
The rookie ratio is the share of a project team with less than one year of company tenure. It is now a measurable, benchmarkable KPI, and Bridgit’s data shows it is concentrated exactly where you would expect it to do the most damage: on the largest, most complex jobs.
What the rookie ratio actually measures
And why “less than one year” is the line that matters
The rookie ratio is straightforward: it is the percentage of a project team with less than one year of tenure at the company. Not less than a year in the industry. Not new graduates. Tenure at the firm, on the team you are about to staff up.
That distinction matters because the risk it captures is institutional, not just technical. A 15-year veteran joining your firm two months ago does not know your subcontractors, your owner relationships, your safety protocols, or the way your superintendents communicate with field crews. They are competent. They are also, by Bridgit’s definition, a rookie on your team.
The report’s headline number, 36.4% on average, sounds manageable until you read the second number. On project teams of 51 or more people, the rookie ratio averages around 56%, meaning more than half the team is in their first year with the company. Those are also the teams running data centers, large infrastructure programs, and complex industrial work, the same project types growing fastest in 2025.
Most workforce decisions in construction still happen on instinct and spreadsheets. The gap between instinct and data is measured in years of planning horizon and points of attrition.Mallorie Brodie, CEO and Co-founder, Bridgit
Why the number is climbing
Retirements, attrition, and the treadmill effect
Two structural forces are pushing the rookie ratio in the wrong direction at the same time.
The first is retirement. With 41% of the workforce heading for the exit by 2031, every contractor in the country is replacing senior people faster than the pipeline is delivering them. The second is what Bridgit calls the “treadmill effect”: 71.7% of contractors increased headcount in 2025, but 46% reported zero net workforce growth because attrition burned through everything they hired. Median attrition sits at 18.7%, which means a contractor hiring 100 people to grow has to factor in roughly 19 backfills just to stand still.
Layer those together and the math is unforgiving. You hire to grow. Attrition eats most of it. The people leaving are disproportionately less tenured, so the people you keep are senior, the people you bring in are new, and the experience curve on your project teams gets steeper every quarter. The rookie ratio is the symptom of that compounding.
The downstream cost of a rookie-heavy team
Safety, quality, and the data nobody wants to look at
The case for tracking the rookie ratio is not abstract. It shows up in claims data.
Travelers’ Injury Impact Report, which analyzed more than 1.2 million workers compensation claims, found that first-year employees account for approximately 36% of all workplace injuries and 34% of total claim costs across industries. That correlation between tenure and incident rate is not new. What is new is the ability to forecast it at the portfolio level before a project starts, rather than reading about it in the safety report after the fact.
Project outcomes follow the same pattern. Senior superintendents and project managers turn over at roughly a quarter the rate of their non-senior counterparts. Their replacements are coming through the system, but the tenure data shows where the cliff sits: if a superintendent or PM stays past 3.7 years, they are on the path to senior tenure. Most do not. The implication for staffing is that the experienced person you assigned to anchor a complex job might be technically on the team and practically unavailable, covering problems on another site.
How to actually track it
From spreadsheet curiosity to live KPI
Tracking the rookie ratio properly is not a quarterly exercise. It is a forecast that should sit alongside your pursuit pipeline and workforce plan. The contractors getting this right do four things.
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The real value is in pursuit decisions, not project reviews
The contractors using the rookie ratio strategically are not just measuring it. They are using it to make go/no-go calls on bids, route the right teams to the right projects, and feed retention investments where the data says the bleed is worst. Commute distance, for instance, is one of the strongest predictors of attrition. So is whether someone got the project type they asked for. Both are knowable. Few firms track them.
The deeper move is treating the rookie ratio as a leading indicator for where to spend training money. If your portfolio is going to be 50% rookies on the largest jobs eighteen months from now, the time to invest in structured onboarding, mentorship pairing, and a documented playbook is now, not after the first claim hits. Japan’s Takenaka Construction puts new entrants through a year-long residential training program with hard milestones. No one is suggesting US or UK contractors copy that model wholesale, but the underlying point stands: at this rate of churn, ad-hoc training is no longer a strategy.
And the rookie ratio sits alongside other operational levers that compound. US construction labor productivity is roughly where it sat in 1950, while every other industry has tripled. Some of that gap is technology adoption. A meaningful share of it is the experience curve, and the experience curve is exactly what the rookie ratio quantifies.
Strategic vs reactive workforce planning
Where contractors actually sit on the spectrum
| Dimension | Reactive | Strategic |
|---|---|---|
| Rookie ratio tracking | Not measured, or eyeballed per project | Tracked monthly, forecasted 6+ months out |
| Tenure definition | Inconsistent across teams | Standardized at 12 months company tenure |
| Project-team pairing | Whoever is available | Calibrated to project complexity and target ratio |
| Attrition data | Aggregate exit numbers | Demographics, commute, manager fit, project type |
| Planning horizon (ENR 50) | ~4.7 years | ~6.8 years |
| Mentorship pairing | Proximity-based | Role-to-role, deliberate |
The bigger picture
Why this metric is going to keep climbing
The rookie ratio is not going to mean-revert. Net international migration is projected to fall from 2.7 million in 2024 to roughly 321,000 in 2026, removing the demographic backstop the US construction labor market has leaned on for years. Quit rates are at a nine-year low and hiring is at a record low, but the industry still needs roughly 349,000 net new workers in 2026 to keep up with demand. Whoever fills those seats is, by definition, a rookie on someone’s project team.
That is why Bridgit’s decision to publish the benchmark matters beyond the headline number. The rookie ratio is the first commonly defined, broadly measurable workforce KPI the industry has agreed on for project team composition. Once a number is measurable, it gets managed. Once it gets managed, the contractors who manage it well start to pull ahead of the ones who do not.
- The number is the point. 36.4% average, 56% on the biggest teams, is not a target. It is the baseline you are operating against right now, whether you measure it or not.
- Pursuit decisions need this. The most expensive time to find out you have an experience gap is after a project starts. Forecast the ratio at the bid stage.
- Retention beats hiring. Senior people turn over at a quarter the rate of non-senior. Closing the leak between years one and four is the single highest-leverage move on the workforce P&L.
Frequently asked questions
The rookie ratio is the percentage of a construction project team with less than one year of tenure at the company. It measures team-level experience composition, not individual skill. Bridgit’s 2026 Construction Workforce Benchmark Report introduced it as the first cross-industry benchmark for this metric, drawn from data on 233 contractors and over 114,000 professionals. (Source)
36.4% is the average rookie ratio across the dataset. It is a useful baseline rather than a target. The more important number for most contractors is the team-size breakdown: teams of 51 or more average around 56%, which is where the operational and safety risk concentrates. (Source)
Travelers’ Injury Impact Report, based on more than 1.2 million workers compensation claims, found first-year employees account for approximately 36% of workplace injuries and 34% of total claim costs across industries. Higher rookie ratios on a project team correlate with higher exposure unless paired with structured mentorship and slower ramps on complex work. (Source)
71.7% of contractors increased headcount in 2025, but 46% reported zero net workforce growth because attrition burned through their hiring. The industry’s median attrition rate of 18.7% means firms must hire roughly 119 people for every 100 they want to net add. That cycle of hiring-to-stand-still is the treadmill. (Source)
Senior superintendents and project managers turn over at roughly a quarter the rate of their non-senior counterparts. The retention cliff is in years one to four. If a super or PM gets past the 3.7-year median tenure mark, they are likely to stay. Most leave before. Commute distance, project type assignment, and manager fit are among the most consistent drivers Bridgit hears anecdotally and in customer data. (Source)
ENR 50 contractors plan their workforce roughly 6.8 years out, compared to 4.7 years for the rest of the industry. The gap is partly a function of larger contractors winning larger, longer-lead-time projects, which forces more advance staffing planning. That same planning depth is what makes their rookie ratio data more usable as a leading indicator. (Source)
The Bridgit dataset is US-dominant, focused mostly on ENR 400 general contractors, with growing UK and ANZ coverage. Bridgit’s CEO Mallorie Brodie has said she expects the rookie ratio findings to translate broadly to project management staff in other markets, though hourly and self-perform data will likely differ. A UK-specific edition is on the roadmap. (Source)
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