Contractor Insurance Coverage Adequacy Calculator
Evaluate whether your current insurance coverage is adequate for your contracting business based on project values, payroll, risk exposure, and industry benchmarks.
Formulas Used
Recommended General Liability (GL):
GLbase = max(Annual Revenue × 2%, $1,000,000)
GLrecommended = max(GLbase × Risk Factor × Location Multiplier × Sub Adjustment, Largest Project, $1,000,000)
Rounded up to nearest $500,000
Recommended Workers' Compensation Premium:
WC Premium = (Annual Payroll ÷ 100) × Class Rate
Class rates range from $4.50 (low-risk) to $18.00 (demolition) per $100 payroll, based on NCCI classification.
Recommended Umbrella / Excess Liability:
Required when: Revenue > $500K, Largest Project > $500K, or non-residential / subcontractor work
Umbrella = max(Revenue × 1.5, Largest Project × 2, $1,000,000), capped at $5,000,000, rounded to nearest $1M
Coverage Adequacy Score:
GL Score = min(Current GL ÷ Recommended GL × 100, 100)
WC Score = min(Current WC Premium ÷ Recommended WC Premium × 100, 100)
Umbrella Score = min(Current Umbrella ÷ Recommended Umbrella × 100, 100)
Overall Score = (GL Score × 40%) + (WC Score × 30%) + (Umbrella Score × 30%)
Assumptions & References
- General Liability minimum of $1,000,000 per occurrence is the industry standard for most contractors (ISO CGL form).
- GL coverage should equal or exceed the value of the largest single contract per standard bonding and client requirements.
- Workers' Compensation class rates are approximated from NCCI (National Council on Compensation Insurance) base rates; actual rates vary by state and experience modifier.
- Experience Modification Rate (EMR) assumed at 1.0 (neutral); businesses with claims history may have higher rates.
- Umbrella/Excess Liability is strongly recommended for commercial, industrial, and government projects per AGC (Associated General Contractors) guidelines.
- Location multipliers reflect increased liability exposure: commercial (1.25×), industrial (1.5×), government (1.4×).
- Subcontractor adjustment (1.15×) accounts for vicarious liability exposure when subs lack adequate coverage.
- Equipment/Inland Marine coverage should equal 100% of replacement value per industry best practice.
- This calculator provides estimates only. Consult a licensed insurance broker for binding coverage recommendations.
- References: NCCI, ISO CGL, AGC Risk Management Manual, IRMI Contractor Insurance Guidelines.