NH Contractor Insurance Cost Estimator
Estimate your annual contractor insurance costs in New Hampshire including General Liability, Workers' Compensation, and Commercial Auto coverage based on your trade, annual revenue, payroll, and fleet size.
Formulas Used
General Liability Premium
GL Premium = (Annual Revenue ÷ 1,000) × Trade Base Rate × Limit Multiplier
Trade base rates range from $1.20 (landscaping) to $3.20 (roofing) per $1,000 revenue.
$2M/$4M limit applies a 1.35× multiplier. Minimum premium: $750.
Workers' Compensation Premium
WC Premium = (Annual Payroll ÷ 100) × NCCI Class Rate × Experience Modification Rate (EMR)
NCCI rates range from $5.20 (electrical) to $22.00 (roofing) per $100 payroll.
EMR: 1.00 (no claims), 1.15 (1 claim), 1.35 (2 claims), 1.60 (3+ claims). Minimum: $500.
Commercial Auto Premium
Auto Premium = Number of Vehicles × Per-Vehicle Rate × Claims Surcharge
Per-vehicle rates range from $1,600 (landscaping) to $2,200 (roofing) annually.
Claims surcharge: +8% per claim on record.
Tools & Equipment (Inland Marine)
Tools Premium = $350 base + ($50 × Number of Employees)
Total = GL + WC + Auto + Tools & Equipment
Assumptions & References
- General Liability rates based on ISO GL rating manual and NH Dept. of Insurance filed rates (2023–2024).
- Workers' Compensation rates based on NCCI loss costs for New Hampshire; NH uses NCCI for WC rating.
- NCCI class codes used: General Contractor (5606), Electrical (5190), Plumbing/HVAC (5183), Roofing (5551), Framing (5645), Painting (5474), Landscaping (0042), Masonry (5022), Excavation (6217).
- Experience Modification Rate (EMR) is estimated from claim count; actual EMR is calculated by NCCI using 3 years of loss history.
- Commercial auto rates reflect NH average for 1-ton or lighter commercial vehicles with $1M CSL liability; heavier equipment or specialty vehicles will differ.
- Tools & Equipment (Inland Marine) estimate assumes standard contractor tools; scheduled equipment or high-value items require separate rating.
- NH does not require contractors to carry a specific minimum GL limit by statute, but many project owners require $1M/$2M minimum.
- NH RSA 281-A governs Workers' Compensation requirements; sole proprietors may elect to exclude themselves.
- Estimates do not include umbrella/excess liability, professional liability (E&O), builder's risk, or surety bonds.
- All figures are estimates for budgeting purposes only. Actual premiums depend on underwriting, deductibles, prior losses, and carrier selection.