Whether a contractor needs to be bonded depends on three things: where they work, what kind of project it is, and who is hiring them. Most states require a surety bond as a condition of holding a contractor’s license, federal construction contracts over $150,000 require performance and payment bonds, and many private clients require bonding by contract even when no law forces them to. So in practice, most working contractors do need to be bonded, and if you’re hiring one, you should almost always require it.
What Being Bonded Actually Means
A contractor bond is a three-party agreement. The contractor buys it, a surety company backs it, and the client or government agency is the one it protects. If the contractor fails to perform or fails to follow the law, the client can file a claim against the bond and recover losses up to the bond’s face value.
This is the point where most people get it wrong: a bond is not insurance for the contractor. Liability insurance covers the contractor’s business against accidents and negligence. A bond covers the client against the contractor’s failure. The client is the beneficiary, not the contractor.
A bond also isn’t a pool of money the surety expects to lose. Every bond comes with an indemnity agreement obligating the contractor to repay the surety for any claim paid out. Think of it as closer to a line of credit than an insurance policy. That repayment obligation is what makes bonding meaningful; a contractor who triggers a claim owes the money back.
When a Contractor Is Legally Required to Be Bonded
Federal Construction Projects
Federal law is the clearest. Under 40 U.S.C. §§ 3131–3134, any federal construction contract over $150,000 requires the contractor to provide both a performance bond and a payment bond before work begins.1Acquisition.GOV. 28.102-1 General Both must equal 100% of the contract price.2Acquisition.GOV. 48 CFR 52.228-15 – Performance and Payment Bonds-Construction
For federal contracts between $35,000 and $150,000, the contracting officer must select at least two forms of alternative payment protection, which can include a payment bond, an irrevocable letter of credit, a tripartite escrow agreement, or certificates of deposit.1Acquisition.GOV. 28.102-1 General Below $35,000, no bonding is required.
Bidding phase bonds also come into play on federal work. A bid bond guarantees that if the contractor wins the bid, they’ll accept the contract and provide the required performance and payment bonds. On federal projects, bid bonds are often set at 20% of the bid amount.
State and Local Government Projects
Every state has passed some version of a “Little Miller Act” that imposes bonding requirements on state and local government construction.3ConsensusDocs. Miller Act Bonding: Requirements and Waiver The specifics vary. Contract thresholds are not the same as the federal ones, definitions of “public works” differ, and some states make the government agency itself liable to subcontractors if it fails to require a payment bond. A contractor doing public work needs to check the statute in the state where the project sits rather than assume the federal rules carry over.
Contractor Licensing
Many states require a surety bond simply to hold a contractor’s license, separate from any specific project. License bonds guarantee the contractor will follow building codes and consumer protection laws. Required amounts range from a few thousand dollars to well over $100,000, depending on the state and the license classification, and the amount often scales with the dollar value of work the license authorizes.
A contractor operating without the required license bond is operating unlawfully in that state, whether or not any particular client asks for proof. If bonding is a licensing condition where the contractor works, the answer to “does this contractor need to be bonded” is yes for every job they take.
When Private Clients Should Require a Bond
No law forces a private property owner to require bonds, but the reason to do it anyway is straightforward: mechanic’s liens. If a contractor takes your money and fails to pay their subcontractors or suppliers, those unpaid parties can file liens directly against your property. You can end up paying for the same work twice, once to the contractor who kept the money and again to clear the liens.
A payment bond redirects that problem. Unpaid subcontractors and suppliers file a claim against the bond instead of a lien against your building. On a large commercial project, this is one of the most effective protections a property owner has. On a small residential job, it may be overkill, but the risk calculation shifts quickly as the contract price goes up.
What Happens If You Hire an Unbonded Contractor
Hiring an unbonded contractor isn’t automatically illegal. It depends on whether your jurisdiction requires bonding for that type of work. What it always means is less protection.
Without a bond, you carry all the financial risk yourself. If the contractor abandons the job, does substandard work, or disappears with your deposit, your only path to recovery is suing them directly. That means attorney fees, months or years of litigation, and no guarantee of collecting anything at the end, especially if the contractor has no assets or has shut down the business.
The lien exposure is the sharper edge. A bonded contractor’s failure to pay a supplier becomes a bond claim; an unbonded contractor’s failure to pay becomes your problem, attached to your property, and it doesn’t matter that you already paid the contractor in full. For any project of meaningful size, requiring proof of bonding before signing is one of the cheapest forms of insurance you can buy — and it costs you nothing, because the contractor pays the premium.
How to Verify a Contractor Is Actually Bonded
A contractor saying they’re bonded is not verification. Ask for the bond number, the name of the surety company, and the bond amount, then contact the surety directly to confirm the bond exists, is active, and hasn’t lapsed or been cancelled.
Most state licensing boards publish free online databases where you can look up a contractor’s license and see the associated bond information in minutes. If a contractor claims to be licensed and bonded but stalls, gets defensive, or can’t produce documentation, treat that as a serious warning.
For federal projects, the surety company itself needs to be on the Department of the Treasury’s Circular 570 list of companies authorized to write federal bonds.4Bureau of the Fiscal Service. Surety Bonds A bond from a company that isn’t on the list won’t satisfy federal bonding requirements, no matter what the paperwork says.