Mechanical, electrical, plumbing, civil, and general contractors at $30M–$300M in revenue accumulate leakage in vendor and subcontractor spend that no project-level cost code captures. The leakage hides between the project ledger and the contract terms.
Construction firms run their financial discipline at the project level. Job-cost codes, change orders, and percentage-of-completion accounting absorb attention, while back-office vendor contracts — the master purchase agreements with material suppliers, the equipment rental terms, the fuel surcharge schedules, the insurance riders — sit largely unexamined.
The result is a structural blind spot. Material supplier rebates that should activate at quarterly volume thresholds go unrealized because purchases were split across branches. Equipment rented for a project keeps billing weeks after demobilization because nobody on the AP side gets the off-rent ticket. Fuel surcharges escalate against an index nobody monitors. Insurance and bond premiums escalate at renewal beyond the contractual cap.
A forensic audit operates against the historic AP data — not against active jobs — and surfaces the leakage that project-level cost controls were never designed to catch.
Lumber, steel, drywall, electrical, plumbing, and HVAC material suppliers operate tiered rebate programs that require active enforcement to realize. Multi-branch contractors commonly leak rebates where purchasing is split across branches, where tier thresholds are crossed mid-quarter without adjustment, or where supplier rebate statements are not reconciled against AP records.
Sunbelt Rentals, United Rentals, Herc, BlueLine, and regional rental houses bill at rates that drift from contracted rate cards. Common findings: weekly-to-monthly conversion errors (rentals billing monthly that should have rolled to weekly), environmental fee creep, refueling overcharges, damage-waiver pricing above contract, and equipment continuing to bill after demobilization tickets were issued.
Material delivery and ready-mix concrete suppliers apply fuel surcharges against indexed schedules (DOE EIA, regional indices) that are commonly misapplied or escalated above contractual caps. Delivery zone surcharges, after-hours fees, and minimum-load penalties accumulate without invoice-level reconciliation.
General liability, workers compensation, builder's risk, and surety bond premiums escalating at renewal beyond contracted caps. Experience modification factor calculations not reconciled against actual loss history. Audit premium adjustments at year-end commonly applied incorrectly.
Subcontract change orders billed above original unit pricing. Retainage held by upstream owners not flowed through to subs on the same release schedule. Bond and insurance premium adjustments billed without contract basis. Pay-app math errors that compound silently over a multi-year subcontract relationship.
Procore, BuilderTrend, Sage, Viewpoint, Heavy Construction Systems Specialists (HCSS), Bluebeam, Autodesk, and ancillary tools maintained at legacy seat counts and feature tiers post-growth. Annual escalators commonly compound at 6% to 10% above contractual caps with no procurement-side challenge.
Ranges drawn from public industry benchmarks (KPMG Supplier Management commentary on contractual leakage; ENR cost reporting; Construction Financial Management Association operational benchmarks). Specific recovery figures depend on firm size, project mix, and procurement maturity.
Illustrative scope and structure. Specific findings vary by firm and are confidential to the engagement.
Findings are delivered as a confidential dossier with line-item evidence, vendor-by-vendor recovery prioritization, and a 90-day implementation roadmap. Where the engagement is sourced through a PE sponsor or transaction advisor, deliverable posture is set at engagement-letter stage.
For Operating Partners & Advisors →Across US specialty trade and mid-market construction firms, forensic vendor audits typically surface recoverable leakage in the 3% to 8% range of audited vendor and subcontractor spend. The upper end concentrates in firms with high equipment rental usage and multi-supplier material sourcing without enforced rebate tracking.
Material supplier rebates (lumber, steel, drywall, electrical, mechanical) are reconciled against contract tier thresholds, purchase volumes by period, and supplier-issued rebate statements. Variances commonly surface where purchasing was split across multiple branches or where tier-step thresholds were crossed mid-quarter without rebate adjustment.
Yes. Equipment rental from Sunbelt, United Rentals, Herc, and regional rental houses is commonly audited for: contract rate vs invoiced rate variance, environmental and refueling fee overcharges, damage waiver pricing creep, weekly-to-monthly conversion errors, and idle equipment continuing to bill after project demobilization. Typical variance: 4% to 11% of total rental spend.
The audit operates against historic AP data and does not disrupt active project cost workflows. PMs, superintendents, and field staff are not involved. The engagement runs against extracted vendor master, AP transaction, and contract files in our environment, with a single finance-side point of contact — typically the CFO or controller.
For broader questions about scope, methodology, and engagement structure, see the full Answers page.