OVERHEAD RATE FOR SWPPP CONTRACTORS — WHAT IT SHOULD BE.
The target overhead rate for SWPPP and erosion control contractors doing $2M–$8M is 11–15% of revenue. Multi-site portfolio management, inspection scheduling, agency coordination, and the administrative overhead of compliance-driven work pushes SWPPP overhead above most trades. If you have never formally calculated your overhead rate — or if owner salary is not included at market rate — your real rate is almost certainly higher than what you are bidding.
SWPPP work is administratively dense relative to its field scope. The compliance burden — inspection logs, BMP installation documentation, corrective action tracking, agency communication — creates overhead that does not exist in the same volume for production trades. That administrative cost belongs in the overhead rate.
OVERHEAD BENCHMARKS FOR SWPPP CONTRACTORS.
SWPPP contractors sit at the higher end of the subcontractor overhead range because of the compliance and multi-site management burden. A well-managed SWPPP company at $3M–$6M should be in the 11–13% range. Above 18% indicates administrative cost that has grown beyond what the revenue base can support.
THE LINE ITEMS THAT PUSH SWPPP OVERHEAD ABOVE TARGET.
Multi-Site Inspection Scheduling and Administration
SWPPP contractors managing 20–60 active sites simultaneously carry significant scheduling and administrative overhead. The office coordinator or project manager time spent scheduling inspections, confirming completion, tracking inspection logs, and coordinating corrective actions is not a direct job cost — it is overhead. At $4M revenue with 40 active sites, inspection administration alone can run $35,000–60,000 annually.
Compliance Documentation and Agency Communication
NOI filings, SWRCB coordination, municipal permit administration, and inspection report documentation require consistent administrative time. A SWPPP company in a heavily regulated market may spend 8–12% of office staff time on agency-facing compliance administration that belongs entirely in overhead.
BMP Inventory and Equipment Maintenance
Silt fence, straw wattles, compost socks, inlet protection — the BMP inventory that is not being charged to individual sites at a unit rate sits in overhead as storage, replacement, and inventory management cost. A contractor managing a large reusable BMP inventory for multi-site deployment carries 2–3% of revenue in BMP overhead if the inventory is not fully charged to projects.
ONE SITTING. REAL NUMBER.
Free calculator: The CFOS overhead rate calculator walks through every line item and produces your real rate in about 10 minutes at constructioncfo.net/construction-overhead-rate-calculator-interactive
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WHAT IS YOUR REAL SWPPP OVERHEAD RATE?
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