GROSS MARGIN BENCHMARKS FOR MARINE CONTRACTORS
Marine subcontractor gross margins typically run 18–28% on commercial work. The wide range reflects significant differences in scope mix, customer concentration, and equipment intensity. Specialty marine work (heavy pile driving, deep foundations, dredging) runs at the higher end. Light marine construction (dock building, fender systems, light bulkhead) runs at the lower end. Public sector work generally runs 200–400 basis points below private commercial because of compliance overhead. The benchmark range matters less than whether the margin actually materializes after the project completes — most marine subs lose 200–600 basis points between bid and closeout.
The bid margin is the promise. The closeout margin is the reality. Marine work has the widest spread between the two.
MARINE GROSS MARGIN RANGES
Marine subcontractor gross margin ranges by work type and customer mix:
- Specialty marine (deep foundations, pile driving, dredging): 22–30% gross margin. Equipment-intensive, specialized crew requirements, higher technical risk — commands higher margin where competitive bid environment allows.
- Heavy marine construction (bulkheads, wharves, large dock work): 19–26% gross margin. Moderate equipment intensity, established crews, broader competitive field.
- Light marine construction (fender systems, light dock work, small bulkhead): 16–22% gross margin. Lower equipment requirements, broader competitive field, more price-sensitive customers.
- Public sector marine (USACE, port authority, state DOT): 17–24% gross margin. Compliance overhead and competitive bid pressure compress margin relative to private commercial work.
- Private commercial marine (commercial GCs, industrial owners): 20–28% gross margin. More room for relationship-based pricing and value-driven negotiation.
These ranges represent properly calibrated marine subs operating with disciplined estimating, accurate cost coding, and rigorous change order documentation. Subs without those structural elements often land 300–800 basis points below benchmark on identical work.
FIVE PLACES MARINE GROSS MARGIN DISAPPEARS
MOBILIZATION COST UNDERESTIMATED AT BID
Marine mobilization runs 12–25% of contract value on most projects. Estimators working from standard templates often estimate mobilization at 5–8%. The 4–17% gap shows up as actual cost overrun against budget at closeout. The work didn’t go wrong; the bid was wrong. A $4M project with 6% mobilization underestimate burns 240 basis points of gross margin.
EQUIPMENT IDLE TIME ABSORBED
Equipment-heavy marine work bids against assumed utilization. Actual utilization runs lower due to permitting delays, weather windows, marine traffic schedules, and project sequencing. Idle equipment cost absorbs into project overhead, eating gross margin. A pile-driving sub bidding against 75% rig utilization that actually achieves 55% utilization burns 350–500 basis points of gross margin.
UNDOCUMENTED CHANGE CONDITIONS
Marine work routinely encounters differing site conditions — harder bottom, unexpected obstructions, current variation, sea state changes. PMs who don’t document these conditions for change orders absorb the cost. A $5M marine project typically loses 150–400 basis points of gross margin to undocumented changed conditions. The fix is field discipline, not bidding adjustment.
SOV BILLING UNDER-CAPTURED
Aggressive SOV billing (where contract allows) accelerates cash and captures retention earlier. Conservative SOV billing leaves money in the project longer. Marine subs that under-bill on the SOV not only delay cash — they often lose margin recovery if the project runs into late-stage issues that compress final pay applications.
SUBCONTRACTOR AND VENDOR COST CREEP
Marine projects often subcontract crane services, dive operations, specialty trade work, and material vendor relationships. Sub-tier subcontractor cost creep (vendor adjustments, scope additions, schedule delays) compounds across the project. Marine subs without active sub-tier vendor management typically experience 100–300 basis points of sub-tier cost creep that erodes gross margin.
HOW MARINE MARGINS GET PROTECTED
- Bid-to-closeout margin variance tracked. Every project tracked for bid margin vs. actual closeout margin. Variance pattern surfaces whether the gap is structural (bid wrong) or operational (execution wrong). Different problems need different fixes.
- Mobilization recovered through SOV. Every project bid with mobilization-loaded SOV that recovers actual cost in weeks 1–4. Working capital stops absorbing mobilization silently.
- Equipment costed by production hour. Major equipment costed at honest production rates. Idle drag surfaces as visible cost instead of hidden gross margin compression.
- Change order discipline. Field conditions documented within 5–10 days. PM-level accountability for change order pipeline. Conditions that should produce change orders actually produce change orders.
- Sub-tier vendor management. Sub-tier subcontractor and vendor cost tracked monthly against project budget. Creep surfaces early enough to manage.
The gross margin you achieve isn’t the gross margin you bid. The discipline that closes the gap lives in field operations, billing structure, and change order management — not in estimating.
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