Contractor Insurance Coverage Requirements Calculator
Estimate the recommended minimum insurance coverage amounts for your contracting business based on project value, trade type, workforce size, and common state requirements.
Formulas Used
General Liability — Per Occurrence:
max($1,000,000 , Project Value × Trade Risk Multiplier × Work-Type Multiplier × 0.20) → rounded up to nearest $500K
General Liability — Aggregate:
max($2,000,000 , Annual Revenue × Trade Risk Multiplier × Work-Type Multiplier × 0.30) → rounded up to nearest $500K; must be ≥ 2× per-occurrence
Umbrella / Excess:
max($1,000,000 , Project Value − GL Per-Occurrence , Annual Revenue × 0.50 − GL Aggregate) → rounded to nearest $1M
Workers' Comp Premium Estimate:
(Employees × $55,000 avg payroll) ÷ 100 × Trade NCCI Rate per $100 payroll
E&O / Professional Liability:
max($500,000 , Annual Revenue × 0.25) → rounded to nearest $250K
Trade Risk Multipliers: Roofing 1.80 · Demolition 1.70 · General 1.50 · Electrical 1.40 · HVAC 1.35 · Plumbing 1.30 · Concrete 1.25 · Carpentry 1.20 · Painting 1.15 · Landscaping 1.10
Work-Type Multipliers: Government 1.75 · Industrial 1.50 · Commercial 1.25 · Residential 1.00
Assumptions & References
- General Liability limits follow ISO Commercial General Liability (CGL) form standards and common lender/GC requirements (ISO GL 00 01).
- Workers' Compensation is statutory (required) in 49 states; Texas allows opt-out. Employers Liability limits follow standard NCCI policy form.
- Trade risk multipliers are derived from ISO GL classification codes and NCCI experience rating plans for construction trades.
- NCCI workers' comp rates used are illustrative averages; actual rates vary by state, experience modification factor (EMR), and payroll classification.
- Commercial Auto Combined Single Limit (CSL) of $1M is the standard requirement for most commercial contracts and DOT-regulated vehicles.
- Umbrella/Excess is recommended when any single project value exceeds the GL per-occurrence limit or annual revenue exceeds $2M.
- Performance/Surety bonds at 100% of contract value are standard for federal and most state public-works contracts (Miller Act, Little Miller Acts).
- Average payroll assumed at $55,000 per employee for premium estimation purposes only.
- Premium ranges are rough benchmarks based on industry surveys (IRMI, Insureon, Next Insurance 2023–2024 data); actual quotes will vary.
- This calculator does not constitute insurance advice. Consult a licensed commercial insurance broker for binding coverage recommendations.