Where bridge contractors lose money
5 things cost bridge contractors money without ever becoming a line item, and each one traces to a step you can install. Bridge contractors average 22% gross margin, 15% overhead and 7% net profit at $1M–$5M of revenue. The CFOS target at that size is 24.5% gross margin, 14% overhead and 10.5% net, and the 3.5 points left on the table is where those mechanisms live. Figures for all 7 revenue bands are in the table below.
Bridge ranks 2nd of 11 in civil and earthwork on net profit, and it has leaner overhead than the 48-trade average. Here is every figure, across all 7 revenue bands.
Bridge by revenue band
| Metric | $1M–$5M | $5M–$10M | $10M–$25M | $25M–$50MModeled | $50M–$100MModeled | $100M–$500MModeled | $500M+Modeled | CFOS target at $1M–$5M |
|---|---|---|---|---|---|---|---|---|
| Overhead | 15% | 14% | 13% | 12% | 11% | 10% | 9% | 14% |
| Gross margin | 22% | 23% | 24% | 25% | 27% | 28% | 30% | 24.5% |
| Net profit | 7% | 9% | 11% | 13% | 16% | 18% | 21% | 10.5% |
| Metric | $1M–$5M | $5M–$10M | $10M–$25M |
|---|---|---|---|
| Overhead | 14% | 13% | 12% |
| Gross margin | 24.5% | 25.5% | 26.5% |
| Net profit | 10.5% | 12.5% | 14.5% |
Modeled extension of the survey curve, not reconciled against the licensed CFMA Benchmarker. That applies to the 4 bands above $10M to $25M, and no CFOS target is published for them.
Gross margin and overhead come from CFMA, Jones Maresca and SPM's own trade data, because those are the figures those sources report by trade and size. Net profit is calculated from them as gross margin minus overhead, so the three rows tie. That makes it an operating profit figure: what is left before interest, other income and expense, and the tax planning choices owners make, such as bonuses, depreciation methods and retirement contributions.
Surveys report net income before taxes after those items, so a reported net can run below the figure here. At the typical contractor the difference is small: CFMA's 2025 medians are 7.1 percent before interest and taxes and 6.7 percent net income before taxes. It grows with size. Against the separate measured net profit dataset, the calculated net runs 0.8 points higher at $1M to $5M, 2.2 points at $5M to $10M and 3.5 points at $10M to $25M, because the gross margin and overhead rows change faster with size than reported net profit does.
Above the $10M to $25M band the gross margin and overhead rows are a modeled extension of the same curves. They have not been reconciled against the licensed CFMA Benchmarker, and the calculated net there runs well above survey medians, so read those bands as a model and not as a survey result.
SPM The Construction CFO. SPM Trade Benchmark Reference: Bridge. 2026. Sulphur Prairie Management, LLC. https://runoncfos.com/trades/bridge. CC BY 4.0.
Figures on this page were last revised 2026-08-21. Published under CC BY 4.0, which permits reuse of any figure here, including commercially, as long as the credit above travels with it. The same figures in machine-readable form: /benchmarks.json.
Trade level gross margin and overhead compiled by SPM The Construction CFO, validated against published CFMA and JMCO benchmarks. The CFOS targets beside them are from the book CONTROL: The Construction Financial Operating System, published with the full reference at runoncfos.com.
- 2024 Construction Financial Benchmarker, Executive Summary, Construction Financial Management Association, 2024.
- 2025 Construction Financial Benchmarker, Executive Summary, Construction Financial Management Association, 2025.
- 2025 Performance Benchmarks, Construction Companies, Jones Maresca and Company, 2025.
- SPM Trade Benchmark Reference, Sulphur Prairie Management, LLC, 2026.
Sourcing and method: the methodology page.
Which bands are measured. The 4 bands above $10M–$25M extend the survey curve further out and have not been reconciled against the licensed CFMA Benchmarker. How every figure was built is explained on the methodology page.
5 problems specific to bridge
You didn't buy beams, you bought a spot in a casting bed. On a lot of DOT bridge lettings, steel price protection is elected item by item at bid time. A single structure takes four to six separate trips in and out. Girder erection gets bid per beam or per structure.
Each one below points at the item, the unit, the clock, or the party that makes it a bridge problem, and it says which step fixes it.
| Mechanism | Why it's specific to this trade | Step |
|---|---|---|
| Your Girder Date Comes From the Casting Bed Calendar | Most trades order material and take delivery on a schedule they control. On a bridge, the one item that fixes your erection date is made to order against a shared production line, and the release trigger is a state reviewer's signature on shop drawings. That puts your longest lead item under two parties who don't report to you and can't be paid to hurry. | Project management |
| Steel Adjustment Is a Box You Check at Letting | The fabricated and coated portion is where your markup lives, and that's the one portion the index refuses to cover. A trade buying stock material off a shelf reprices at purchase; a bridge sub buys a fabricated assembly quoted a year before it ships, against an election made at letting that never gets revisited. The exposure is set by a checkbox and paid for by the crew twelve months later. | Estimating system |
| One Bridge Takes Five Move-Ins and Pays One Mobilization | A trade that stays on site until it finishes mobilizes once and demobilizes once. A bridge sub leaves and comes back because the structure itself forces the interruptions in work, and every one means crane assembly and teardown, a lowboy move, a trailer, crew travel, and re-staking. The bid still has one lump sum mobilization item covering the first trip. | Job cost structure |
| You Bid Erection by the Beam and Pay by the Day | On most trades the bid unit and the cost unit run together: labor by the hour and material by the piece. On a girder set, revenue is counted in beams while cost is counted in crane days, and the two reconcile only when the pick goes as drawn. Nothing about a railroad closure window or a bearing seat survey acceptance is inside your control. | Equipment cost basis |
| Girders in the Yard Can Be Billed Before They Ship | This provision exists because bridge girders get built months early, for one contract, and can't be resold to anybody. That's why the state will pay for them in storage, and it's also why the dollar amount is big enough to move your bank balance. Trades whose material is stock inventory never get this option, so no one in the field ever taught you to ask for it. | Software and bookkeeping alignment |
Bridge against the other 47 trades
| Metric | Bridge | Civil and earthwork average | All 48 average | Rank |
|---|---|---|---|---|
| Overhead | 15% | 15% | 15.1% | 17th of 48 |
| Gross margin | 22% | 20.7% | 22.1% | 20th of 48 |
| Net profit | 7% | 5.7% | 7% | 21st of 48 |
Bridge sheds 6 points of overhead between $1M–$5M and $500M+, against 6.2 for civil and earthwork as a group. Inside that group, SWPPP and erosion control is the most profitable at 10%, and Civil, Excavation, Paving, 1 more all run 14% overhead, the leanest. Bridge is neither, which is the usual position and the one with the most room in it.
Other civil and earthwork trades
What owners ask
What overhead should a bridge contractor run?
Bridge shares its overhead figure with 14 other trades at this revenue, which is what the published data resolves to. It averages 15% at $1M–$5M and 9% at $500M+, as a percentage of revenue. That's level with the civil and earthwork average. The CFOS target at $1M–$5M is 14%. The CFOS target is one point leaner than your trade's industry average at your revenue.
What gross margin should a bridge contractor run?
Bridge shares its gross margin figure with 12 other trades at this revenue, which is what the published data resolves to. It averages 22% at $1M–$5M and 30% at $500M+, as a percentage of revenue. That is 1.3 points above the civil and earthwork average of 20.7%. The CFOS target at $1M–$5M is 24.5%. The CFOS target recalculates at your revenue: whatever gross margin produces the net profit target once overhead is paid, never below your trade's own industry average.
What net profit should a bridge contractor run?
Bridge shares its net profit figure with 16 other trades at this revenue, which is what the published data resolves to. It averages 7% at $1M–$5M and 21% at $500M+, before taxes, as a percentage of revenue. That is 1.3 points above the civil and earthwork average of 5.7%. The CFOS target at $1M–$5M is 10.5%. The CFOS target recalculates at your revenue: 10 percent before taxes, or 3.5 points better than your trade's industry average, whichever is higher.
What profit margin should a small bridge business run?
Owners usually mean net profit when they say profit margin, and for bridge at $1M–$5M that's 7%. Gross margin is a different number, 22%, and it's what's left after job costs but before overhead. Overhead is the 15% between the two. A small bridge business holding 7% net is at the published figure for its size, and the CFOS target at that revenue is 10.5%.
Does bridge get more profitable as it grows?
Overhead is the number that moves. Bridge sheds 6 points between $1M–$5M and $500M+, which is in line with the 6.2 points civil and earthwork sheds as a group. Net profit starts 0 points under the 48-trade average, so the room is in the overhead line before it's anywhere else.
Where does bridge rank against the other trades?
Bridge ties 4 trades in civil and earthwork on net profit, all at 7%. SWPPP and erosion control is the most profitable at 10%. Civil, Excavation, Paving, 1 more run the leanest overhead at 14%. Gross margin ranks 20th of 48 and overhead ranks 17th.
That's the industry average and the CFOS target for bridge at every size. Want your own books set beside them? The Financial Health Snapshot builds a CEO Report from your last twelve months, sets every figure against your trade, and walks you through it on a 60 minute call. SPM The Construction CFO (Sulphur Prairie Management, LLC) is a separate firm, and the same author runs it.
Everything on this page is something you can install yourself, andCONTROL is the order to do it in. If you would rather buy the finished result, SPM The Construction CFO does this work for bridge contractors as a service. It is a separate firm, Sulphur Prairie Management, LLC, run by the same author.
Wrote CONTROL, the 8 step system behind these figures. More about the author.