Contractors Insurance: What You Need and What It Covers

Most contractors need four coverages at a minimum: general liability, workers' compensation (where their state and headcount require it), commercial auto, and inland marine coverage for tools and equipment. Contract-driven operations usually add umbrella or excess liability, builders risk on projects under construction, and professional liability if they carry design responsibility. Which you actually need — and at what limits — depends on your trade, your payroll, how much work you subcontract, and what your contracts obligate you to carry.

The core coverages at a glance

What underwriters actually evaluate

Contractor pricing is not a flat rate by trade. An underwriter builds a picture of frequency and severity potential from a consistent set of inputs:

• Payroll by class code. Workers' comp premium follows payroll allocated to classifications describing the work performed. Misallocated payroll gets corrected at audit, usually not in your favor.
• Subcontractor usage. How much work is subbed out, and do those subs carry their own coverage? The most common source of audit surprises.
• Work at heights. Construction fall protection is required for unprotected sides and edges 6 feet or more above a lower level, and fall protection was the most frequently cited OSHA standard in FY 2024. Roofing is its own risk class — see our look at workers' comp for roofing contractors.
• Type of work. A service plumber's loss profile looks nothing like a plumber doing rough-in on new multifamily. New residential construction in particular carries construction-defect exposure many carriers restrict or exclude.
• Hot work. Welding, cutting, torching, and roofing kettles create fire exposure some carriers decline outright and others condition on a written hot work permit program.
• Loss runs and years in business. Carriers typically want three to five years of loss history; new ventures are underwritten on the owner's prior experience.

Your experience modifier. For workers' comp, NCCI's Experience Rating Plan compares your payroll and loss record against the average employer in your classification, producing a credit or debit factor. Per NCCI's ABCs of Experience Rating, it generally uses three years of data, weights claim frequency more heavily than severity, and applies only to employers meeting a state premium eligibility threshold. Several states — California, New York, New Jersey, Pennsylvania, Michigan, Delaware, and the monopolistic fund states — run their own plans instead.

How the coverages interact

General liability — and the faulty workmanship nuance

A commercial general liability policy responds to third-party bodily injury, property damage, and personal and advertising injury, and pays defense costs, as the Insurance Information Institute describes here. What it does not do is guarantee your workmanship.

Standard ISO forms contain a "your work" exclusion barring coverage for property damage to your completed work arising out of that work. IRMI's analysis of faulty work and the CGL puts it plainly: the policy "is not meant to turn... into a performance bond." There is an important exception — coverage is generally restored where the damaged work, or the work the damage arose from, was performed on your behalf by a subcontractor. That exception is why general contractors care so much about their subs' coverage. For the fundamentals, see our explainer on general liability.

Workers' compensation

Requirements vary by state, employee count, and industry — there is no single national rule. Coverage is mandatory for most employers in most states, but Texas allows private employers to opt out: the Texas Department of Insurance states they "can choose to carry workers' compensation insurance coverage, but it is not required in most cases." Non-subscribers give up traditional liability defenses and can be sued directly. The NAIC notes that a few jurisdictions — North Dakota, Ohio, Washington, Wyoming, Puerto Rico, and the U.S. Virgin Islands — provide coverage through a monopolistic state fund instead of the private market. Several states set employee-count thresholds, and some apply stricter rules to construction. Verify with your state's agency before assuming you're exempt.

Commercial auto — including vehicles you don't own

Personal auto policies commonly exclude business use and won't cover a vehicle titled to your company. Two categories catch contractors out. A hired auto is one you lease, rent, or borrow — though the business auto form excludes autos borrowed from your own employees. A nonowned auto, per IRMI, is one used in your business but not owned by you — which includes vehicles owned by employees used for company business. If an apprentice runs a parts errand in his own truck and causes a serious accident, your business can be pulled into the claim. Hired and non-owned auto liability closes that gap.

Tools, equipment, and materials

Your tools are not covered by general liability, and standard commercial property coverage is tied to a described location — no help when a trailer is emptied at 2 a.m. on a jobsite. The correct coverage is inland marine: an equipment floater covers equipment that moves from place to place, and an installation floater covers property you're installing at a customer's site until installation is complete.

Builders risk and professional liability

Builders risk covers property in the course of construction. Per IRMI it is typically written on inland marine forms rather than commercial property forms, and usually extends to materials at off-site storage and in transit. Who buys it — owner or contractor — is a contract question. For project-specific risk in more depth, see our construction project coverage guide.

If you carry design responsibility — design-build, delegated design, engineered submittals — general liability will not respond to a design error. Contractors professional liability covers design errors and omissions, written annually or per project.

The gaps contractors hit most often

Treating a certificate as coverage. A certificate of insurance is evidence coverage was purchased — nothing more. The standard ACORD form says so on its face: it "is issued as a matter of information only and confers no rights upon the certificate holder." It also warns that if the holder is to be an additional insured, the policy must actually be endorsed.

Assuming the endorsements exist. An additional insured is someone not automatically covered who is added at the named insured's request; a waiver of subrogation is the insurer acknowledging it won't pursue recovery against a third party. Most construction contracts demand both, and both generally require an actual endorsement. Confirm they're on the policy — and check whether additional insured status extends to completed operations or only ongoing operations.

Uninsured subs becoming your payroll. If a sub can't produce evidence of workers' comp, manual rules generally require that sub's payroll be charged on your policy at the classification that would apply if they were your employees. North Carolina's published version of the NCCI Basic Manual rule sets out the mechanics, including default payroll percentages of the subcontract price when payroll records don't exist. Rules vary by state and rating bureau, but the principle holds: collect the COI before the sub sets foot on the job.

Contractual liability you didn't price. Hold-harmless and indemnity provisions can obligate you well beyond your common-law exposure. Read the indemnity article before you sign.

Limits: per-occurrence versus aggregate

Per-occurrence is the most the policy pays for one event. The general aggregate is the most it pays across the whole policy period. That distinction becomes real in a heavy year with many active projects — a string of moderate claims can erode the aggregate and leave you effectively uninsured for the rest of the term. Once it's exhausted, only products-completed operations claims remain, paid from their own separate aggregate.

Where contracts require dedicated limits per project, the designated construction project general aggregate limit endorsement (CG 25 03) makes the general aggregate apply separately to each designated project. When a contract dictates limits outright, an umbrella or excess policy is usually the efficient way to reach the number.

An illustrative scenario

Hypothetical, for illustration only. This is not a real claim, and outcomes depend entirely on your actual policy language, endorsements, and state law.

Suppose a general contractor hires an uninsured framing sub, and the sub's employee falls and is seriously injured. Three things could plausibly follow. At the next premium audit, the sub's payroll is charged to the GC's workers' comp policy. The injured worker may pursue the GC directly, having no comp coverage of his own to bar the claim. And if defective framing later damages finished work, whether the "your work" exclusion responds turns on the subcontractor exception. One missing certificate touches three coverages.

GL, professional liability, and builders risk are not interchangeable

The same logic separates workers' comp from general liability when someone is hurt. If the injured party is your employee, that's workers' compensation. A homeowner, a passerby, or another trade's worker is general liability — which excludes employee injury precisely because comp is meant to handle it.

What your carrier will ask for

• Payroll records broken out by type of work performed
• Three to five years of currently valued loss runs
• Certificates of insurance for every subcontractor used
• A written description of operations — percentage of revenue that is new construction versus service, residential versus commercial, subbed versus self-performed
• Maximum height worked and whether you perform any hot work
• Owned vehicles and drivers, plus your MVR policy
• A schedule of tools and equipment with values

Common mistakes

• Buying limits based on price rather than what contracts and exposures require
• Letting a business owner's policy stand in for real contractor coverage after the operation has outgrown it
• Under-reporting payroll at binding, then absorbing the correction at audit
• Assuming a personal auto policy covers a work truck

Frequently asked questions

Do I need insurance as a one-person operation with no employees? Usually, yes — general liability. Most clients and general contractors require it before you can start, and licensing rules in many jurisdictions reference it. Workers' comp rules for owners without employees vary by state; some let owners exclude themselves, others do not.

Does general liability cover my tools? No. General liability covers your liability to others, not damage to your own property. Tools and equipment need inland marine coverage.

Will general liability pay to fix work I did wrong? Generally not. The "your work" exclusion keeps the policy from acting as a performance guarantee, though damage caused by a subcontractor's work may fall under an exception.

Is workers' comp required as soon as I hire someone? Not universally. It depends on your state, employee count, and industry — and Texas does not require most private employers to carry it at all. Several states apply stricter thresholds to construction than to other industries.

What limits do contractors need? Contracts drive it. The insurance article of your agreement will state required per-occurrence and aggregate limits, plus whether additional insured status, primary and noncontributory wording, and a waiver of subrogation are required. Build to satisfy the most demanding contract you expect to sign.

Do I need builders risk if the owner already carries it? Sometimes the owner's policy names the contractor and sometimes it doesn't — and it may carry a deductible you'd be responsible for. Confirm in writing rather than assuming.

Getting the program right

Contractor insurance rewards precision. The difference between a program that responds and one that leaves you exposed usually comes down to endorsements, class code accuracy, and subcontractor discipline — not the premium on the declarations page. As an independent agency we work across multiple carriers, which matters here because appetite for contractors, construction risks, specialty trades and installation contractors varies enormously, and contractor coverage sits inside a broader commercial insurance program worth reviewing as a whole.

If you'd like a program reviewed against the contracts you're actually signing, request a quote or get in touch.