General Contractor Business Interruption: Pricing Methodology

What rating basis does Business Interruption use for General Contractors?

The pricing unit for Business Interruption on General Contractors is per $1,000 of insured income. Carriers multiply a per-unit rate (the base loss cost set by ISO, modified by carrier-specific factors) by the exposure to produce the base premium.

This is the most important number on the policy — it controls how renewal premiums move as your operation grows or contracts. The audit at policy expiration trues up the actual exposure against the estimated exposure used at binding, producing return premium or additional premium.

What happens at policy audit for General Contractors on Business Interruption?

At policy expiration, the carrier audits the general contractor's actual exposure for the past year. The rating basis used at audit is the same one used at issuance — per $1,000 of insured income — applied to the documented actuals.

For General Contractors, audit accuracy matters because errors compound. An over-estimate at binding overpays for a year; the audit returns it. An under-estimate underpays for a year; the audit owes it. Either way, the policy ends at the correct net cost; the question is just cash-flow timing.

The math behind a General Contractors Business Interruption policy

For a representative general contractor, the Business Interruption premium math works roughly like this: (exposure per $1,000 of insured income) × (base rate per unit) × (experience modifier) × (schedule credit or debit) × (other adjustments) = premium.

If the rating exposure is 100 units, the base rate is $10/unit, the experience modifier is 0.95 (a 5% credit for clean claims), and the schedule rating applies a 3% credit, the base premium is $100 × $10 × 0.95 × 0.97 = $922. Multi-line discounts, payment-plan fees, and state taxes/surcharges produce the final billable amount.

The experience modifier on General Contractors Business Interruption

Experience modifiers on General Contractors Business Interruption are calculated from three years of paid losses, with the most recent year weighted heaviest. The calculation excludes the most recent policy year (still developing) and uses the prior three completed years.

Claims roll out of the mod window after three years. That is why pricing improves over time after a paid claim — the third anniversary of the claim is the point where it stops affecting the mod and pricing returns to baseline (absent new claims).

What changes at renewal for General Contractors on Business Interruption

The renewal-time recalc on General Contractors Business Interruption captures everything that has changed in the year between policies. New rate filings, your new exposure, your new loss experience, and any operational changes you disclosed all feed into the new premium.

If the renewal number surprises you, ask the broker for the line-by-line breakdown: base rate change, exposure change, experience-mod change, schedule-rating change. Each line is auditable. An unexplained renewal jump usually points to one of those factors moving meaningfully.

How carrier loss-cost multipliers move General Contractors Business Interruption pricing

General Contractors accounts placed in the standard market typically see 3-6 competing quotes, each with its own rating math. The spread between cheapest and most expensive is rarely an error; it reflects each carrier's view of the segment's loss potential and its competitive strategy.

Within a single year, carrier appetite shifts. A carrier that was hungry for General Contractors in January may pull back by July if its loss experience deteriorates. This is why the same submission can produce different competitive landscapes depending on timing.

Common methodology mistakes that overprice General Contractors Business Interruption

General Contractors Business Interruption accounts most often carry hidden costs in three places: a class code that has drifted from the actual operation, an exposure declaration that overstates revenue or payroll, and an experience modifier that hasn't been verified against the carrier's calculation.

Asking the broker to walk through each of these at renewal — preferably before the renewal quote is finalized — produces the largest single set of correctable savings on the policy.