How underwriters price commercial general liability insurance

Understanding how GL is priced gives you two important advantages: you can explain premium changes to clients accurately, and you can identify which factors in a submission are driving the price — and potentially address them. Here is how commercial GL pricing actually works.

The base: class code and exposure base

GL pricing starts with the classification code — a numeric code assigned to every type of business that determines the base rate per unit of exposure. The ISO classification system (used by most admitted carriers) assigns each business type a specific class code with a corresponding rate.

The exposure base — what the rate is applied to — varies by class:

• Revenue/gross receipts — the most common basis for most service businesses and contractors. Rate per $1,000 of revenue.
• Payroll — used for some classes where payroll is a better measure of exposure than revenue.
• Area (square footage) — used for habitational and some retail classes.
• Per unit — used for some classes like parking lots or amusement parks.

For a contractor with $3M in revenue and a rate of $3.50 per $1,000 of revenue, the base GL premium would be $10,500 before any modifications.

Classification accuracy matters

Getting the right class code — or mix of class codes if the business does multiple types of work — is critical. A general contractor who primarily does commercial tenant improvement should be classified differently than one doing residential roofing. The class code determines the base rate, and the wrong classification can result in either significant overpayment or coverage gaps.

For businesses with multiple operations, revenue is typically allocated across the relevant class codes. The underwriter will assign the appropriate split based on what's in the application — which is why a clear, specific business description on the ACORD 125 directly affects price.

Subcontractor exposure

For contractor classes, subcontractor use is a major pricing factor. The standard GL rating rule treats subcontracted work differently depending on whether the subs carry their own GL insurance:

• If the sub has their own GL coverage with the GC named as additional insured: sub's portion of revenue typically excluded from or rated at a reduced rate
• If the sub is uninsured: the sub's labor/revenue gets rated as if the GC performed the work directly — often at a higher rate

This is why collecting certificates from subcontractors matters financially — it directly reduces the rated exposure. Agents who don't explain this to clients are leaving money on the table.

Products and completed operations

GL policies include two distinct coverage components: premises and operations (incidents during the work), and products and completed operations (incidents arising from work after completion or products after delivery). Carriers price these separately.

For contractors, completed operations is often the more significant exposure — claims arising from work done months or years ago are common in construction. Some carriers write contractors with minimal completed operations limits or charge heavily for them. Understanding what limits are included vs. excluded on a given quote is essential when comparing options.

Loss history modifications

After calculating the base premium using class code and exposure, carriers apply experience modifications based on the insured's actual loss history. For larger accounts (typically above $10,000–$25,000 in premium), carriers may use experience rating — comparing the insured's actual losses against the expected losses for that class.

For smaller accounts, loss history is typically handled through underwriter judgment: a surcharge for accounts with adverse history, or credit for those with clean records. This is subjective and varies by carrier and underwriter — which is why presenting loss history with context matters.

Limits and deductibles

The standard GL policy is written with occurrence limits (per occurrence and aggregate). Higher limits cost more, but not linearly — moving from $1M/$2M to $2M/$4M typically costs 15–25% more, not double, because excess layers of coverage are statistically less frequently triggered.

Higher deductibles reduce premium. For accounts with adverse loss history, proposing a higher deductible is sometimes the mechanism that gets a submission through a standard market that would otherwise decline or overcharge.

What agents can do to influence the price

• Accurate, specific classification — don't let a vague description lead to a higher-rated class assignment
• Document subcontractor certificate collection — reduces uninsured sub exposure
• Context on loss history — losses with explanation get better treatment than losses with no context
• Risk management evidence — safety programs, training, written subcontractor agreements
• Accurate revenue figures — underreporting is fraud, but overreporting means overpaying

A well-prepared submission package with complete and accurate information consistently outperforms a sloppy one on price — because underwriters have to load uncertainty into the price when they can't verify key facts.

Accurate data, better quotes

AgencyAssist captures the exact revenue, subcontractor, and operations data underwriters need to price GL accurately — so your clients get competitive quotes, not loaded ones.