SWPPP CONTRACTOR COST PER SITE JOB COSTING
SWPPP and erosion control contractors run a structurally different operations pattern than other commercial trades — 20–80 active sites simultaneously, recurring inspection and maintenance work spread across the portfolio, low individual site dollar values but high portfolio aggregate. Most SWPPP subs aggregate cost across all sites instead of tracking per-site profitability. The result: some sites carry the business (high frequency, easy access, cooperative GCs) while others bleed margin (remote locations, difficult access, problem GCs, weather-prone areas). Without per-site visibility, the bidding pattern repeats the cost structure that’s actually losing money.
A $5M SWPPP business running 60 active sites probably has 35 profitable sites subsidizing 25 unprofitable ones. The aggregate looks fine. The portfolio is bleeding.
WHY SWPPP WORKS DIFFERENTLY
SWPPP and erosion control work has structural characteristics that don’t match other commercial trades. Individual sites typically generate $5K–$50K per year in revenue (vs. $50K–$5M for typical commercial projects). Most revenue comes from recurring inspection and maintenance work rather than one-time installation. A typical SWPPP sub runs 20–80 active sites simultaneously, with crew time spread across the portfolio based on inspection schedules and rain event response.
The aggregate financial picture looks reasonable on most SWPPP businesses. The portfolio reality — which specific sites are making money and which are bleeding margin — is hidden because cost gets aggregated at the company level rather than tracked per site. Some sites carry the business; others lose money on every visit. Without per-site visibility, the owner can’t tell the difference and the bidding pattern keeps repeating the structure that’s losing money.
WHERE THE MARGIN HIDES
TRAVEL TIME ABSORBED ACROSS THE PORTFOLIO
Sites have different drive times from the yard. A site 8 miles away takes 30 minutes round trip; a site 65 miles away takes 3 hours round trip. Travel time absorbed into general overhead means both sites look equally profitable per inspection — even though the remote site costs 4–6x more in crew time and fuel. Remote sites that should be priced 30–50% higher get priced the same as close sites.
RAIN EVENT RESPONSE COST UNALLOCATED
NPDES requirements trigger inspections within 24–72 hours of qualifying rain events. Crews mobilize across multiple sites in response. The cost of rain event response often gets absorbed into general overhead. Sites that trigger frequent response (storm-prone areas, complex sites with multiple BMP requirements) cost dramatically more than steady-state sites. Without allocation, the cost structure looks the same.
MATERIAL CONSUMPTION VARIES BY SITE
Some sites consume erosion control materials (wattles, silt fence, rock filters, hay bales) at much higher rates due to site conditions, construction phase, or recurring failures. Material cost aggregated to general overhead hides which sites are material-heavy. Pricing assumes average consumption that doesn’t match individual site reality.
GC RESPONSIVENESS VARIES BY SITE
Different GCs handle SWPPP differently. Some respond promptly to deficiency notices, schedule remediation work, pay quickly. Others ignore deficiency notices, drag remediation, slow-pay. The cost of dealing with difficult GCs — repeated visits, extended documentation, collection effort — gets absorbed into general overhead instead of allocated to the specific GC relationships causing the cost.
BIDDING REPEATS THE LOSING PATTERN
Without per-site profitability data, the bidding pattern repeats whatever structure is in place. The sub keeps winning bids using cost assumptions that already proved wrong on existing sites. New sites enter the portfolio with the same hidden margin compression as the existing ones. The business grows revenue without growing profitability.
HOW PER-SITE JOB COSTING CHANGES THE BUSINESS
- Each site gets its own job number. Even small sites get individual cost tracking. Crew time, material, travel, equipment all allocated by site visit.
- Travel time tracked separately. Drive time from yard to site captured by visit. Remote sites surface as the expensive sites they actually are. Bidding for new remote sites can reflect the real cost structure.
- Rain event response allocated to specific sites. Each storm response visit allocated to the sites visited. Frequent-response sites surface as cost drivers. Annual contracts on those sites can be repriced or restructured.
- Material consumption tracked by site. Each site’s actual material consumption visible. Material-heavy sites identified and either repriced at renewal or evaluated for site improvement recommendations to the GC.
- GC profitability analysis quarterly. Each GC’s aggregate sites’ profitability calculated. Difficult GCs surface as net-negative relationships. Renewal and new-bid decisions get made against real data.
WHAT PER-SITE VISIBILITY UNLOCKS
A $5M SWPPP sub implementing per-site job costing typically discovers in the first 90 days: 20–35% of active sites are unprofitable at current pricing; 10–20% of GC relationships are net-negative; remote sites cost 2–3x what assumed pricing covered; rain event response is concentrated on a handful of problem sites that should be repriced or exited.
Acting on the data: renegotiating contracts on unprofitable sites, exiting net-negative GC relationships, repricing remote sites at next renewal, bidding new sites with location-appropriate pricing. The net margin impact across 12–18 months runs 300–600 basis points without changing total revenue. The portfolio gets healthier without growing.
SWPPP is a portfolio business that most subs operate as if it were a single aggregate business. The aggregate hides which sites and which GCs are actually carrying the company.
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