5 Insurance Mistakes That Cost Contractors Thousands

Most expensive insurance mistakes aren't dramatic — they're quiet gaps that don't show up until a claim gets denied or an audit bill arrives. After years of writing contractor policies across every trade, the same handful of mistakes account for the majority of the painful surprises. Here are the five worth checking on your own policy today.

Mistake #1: Not Collecting Certificates of Insurance from Subcontractors

If you hire subcontractors and don't collect a certificate of insurance — and ideally an additional insured endorsement — from each one before they start work, you're carrying their risk on your own policy without realizing it. If a sub causes property damage or an injury and doesn't have their own coverage (or you never verified it), the claim can land squarely on your general liability policy, and your premium can reflect that claims history for years afterward.

The fix: Make COI collection a non-negotiable part of onboarding any subcontractor, no matter how small the job or how long you've worked with them. A five-minute check before the job starts is far cheaper than a claim after.

Mistake #2: Under-Reporting Payroll or Revenue to Lower Your Quote

It's tempting to round down when a carrier asks for estimated annual payroll or revenue — a lower number means a lower initial premium. But workers comp policies in particular are subject to an annual audit, where actual payroll is reconciled against what was reported. If your actual numbers come in higher than what you reported, you'll owe the difference — sometimes a large lump sum you weren't expecting, at the worst possible time.

The fix: Report realistic, defensible numbers from the start. If your business has genuine seasonal swings (like HVAC's summer/winter split or landscaping adding snow removal), talk to your agent about how that's typically handled rather than guessing low.

Mistake #3: Assuming Your Policy Covers Claims That Surface After the Job Is Done

A lot of contractors think of their liability coverage as protecting them only while they're actively on a job site. In reality, some of the most expensive claims — a wiring issue that causes a fire months later, a plumbing fitting that fails weeks after installation, a structural issue discovered after a remodel — happen after the work is complete and paid for. This is what completed operations coverage under your general liability policy is for, and not every policy handles it the same way.

The fix: Specifically confirm your completed operations coverage, especially if you're in a trade — electrical, plumbing, remodeling — where delayed-onset claims are common. Don't assume a cheaper policy has the same completed operations protection as a more thorough one.

Mistake #4: Treating Tools & Equipment as Covered Under General Liability

General liability protects against third-party claims — it does not cover damage to or theft of your own tools, trucks, or equipment. This is a surprisingly common misunderstanding, and it usually surfaces at the worst possible time: after a trailer full of tools gets stolen overnight and the contractor discovers there's no coverage for their own property.

The fix: If your business owns meaningful tools, machinery, or equipment — which is true for nearly every trade covered on this site — make sure you have a separate tools and equipment (inland marine) policy, not just general liability.

Mistake #5: Staying with the Same Carrier Year After Year Without Shopping

Loyalty doesn't get rewarded the way you'd hope in commercial insurance. Renewal pricing often creeps up gradually, and many contractors simply accept the renewal number without checking whether it still reflects competitive market pricing for their risk. Meanwhile, your business may have changed — safety improvements, a cleaner claims history, a different work mix — in ways that should be reflected in your pricing but won't be unless someone actively re-shops your risk.

The fix: Have your program reviewed against the broader market periodically, especially after a policy period with no claims or after making documented safety improvements. A licensed agency working with multiple carriers can tell you honestly whether your current pricing is still competitive — an agency captive to one carrier can't.

The Common Thread

Every mistake on this list comes down to the same root cause: treating insurance as a box to check rather than a program that should actually match your business. The contractors who avoid these mistakes aren't necessarily the ones who pay the most for coverage — they're the ones who worked with an agent who asked the right questions up front.

If it's been a while since your policy was actually reviewed against your current operations, get a free quote and let a licensed agent walk through where your program might have gaps — or explore coverage details for your specific trade to see what a properly built policy should include.