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Insurance Glossary

Plain-English definitions of the terms you’ll see in policies, contracts, and certificates.

Contractor insurance terms, explained

Insurance policies, GC contracts, and certificates are full of jargon. This glossary explains the terms contractors actually encounter — in plain English, with links to deeper guides where it helps. Tap a letter to jump, or a term to expand its definition. Still unsure what something in your contract means? Ask a licensed specialist.

A  ·  B  ·  C  ·  D  ·  E  ·  G  ·  H  ·  I  ·  L  ·  O  ·  P  ·  S  ·  U  ·  W

A

Additional Insured

A person or business (usually a GC or property owner) added to your policy so your coverage also protects them for liability arising from your work. Contracts routinely require it — see our general liability page.

Aggregate Limit

The maximum your policy will pay for all claims combined during the policy period. A $1M/$2M policy pays up to $1M per occurrence and $2M total per year.

B

Bond (vs. Insurance)

A bond guarantees your performance or honesty to a third party (like a license bond or performance bond); insurance protects you from losses. Many contractors need both.

C

Certificate of Insurance (COI)

The one-page proof-of-coverage document GCs, landlords, and clients ask for before you start work. Request yours here.

Class Code

The number that categorizes your work for workers’ comp rating. Misclassification is the most common reason contractors overpay.

Completed Operations

Coverage for claims arising from your finished work — critical in the trades, where a problem can surface months after the job. Included in general liability.

Commercial Auto

Coverage for business-owned vehicles. Personal auto policies exclude business use — see commercial auto.

D

Declarations Page

The summary page of your policy showing who’s insured, limits, deductibles, premium, and policy period. The first thing to check for accuracy.

Deductible

The amount you pay out of pocket on a covered claim before insurance pays the rest.

E

Endorsement

A written change to your policy that adds, removes, or modifies coverage — like adding an additional insured or a waiver of subrogation.

Errors & Omissions (E&O)

Another name for professional liability — covers financial losses from design errors, bad specs, or negligent advice.

Exclusion

Something your policy specifically does not cover. Knowing your exclusions (like pollution on standard GL) matters as much as knowing your coverages.

Experience Mod (EMR)

A multiplier applied to your workers’ comp premium based on your claims history versus similar businesses. Below 1.0 saves you money; above 1.0 costs you.

G

General Liability (GL)

The foundation of contractor insurance — covers third-party injury, property damage, and completed operations. Learn more.

H

Hired & Non-Owned Auto

Liability coverage when employees drive personal or rented vehicles for work — a gap most contractors don’t know they have. Part of commercial auto.

I

Inland Marine

Despite the name, nothing to do with water — it covers your tools and equipment wherever they go: jobsite, truck, storage, and in transit. Learn more.

L

Limits of Liability

The maximum your insurer pays — usually shown as per-occurrence / aggregate, like $1M/$2M.

Loss Runs

Your official claims history report from your insurer. Carriers request loss runs when quoting your business — usually for the past 3–5 years.

O

Occurrence

An accident or event that triggers coverage. Occurrence-based policies (standard for contractors) cover incidents that happen during the policy period, even if the claim is filed later.

P

Pollution Liability

Covers spills, runoff, and contamination claims that standard policies exclude. Essential for excavation and increasingly required on public work. Learn more.

Premium Audit

The insurer’s year-end review of your actual payroll and revenue versus estimates. Accurate estimates up front prevent surprise audit bills.

S

Subrogation

Your insurer’s right to recover claim costs from whoever was actually at fault.

Waiver of Subrogation

An endorsement giving up that recovery right against a specific party — a standard GC contract requirement.

U

Umbrella / Excess Liability

An extra layer of limits above your GL, auto, and employer’s liability — how contractors meet $2M–$10M contract requirements. Learn more.

W

Workers’ Compensation

Covers employee medical costs and lost wages for work injuries; required in most states once you have employees. Learn more.

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