A prime contractor is the company that signs the construction contract directly with the project owner and takes responsibility for delivering the finished work. Everything else on the job flows from that single relationship: the prime hires and pays the subcontractors, runs the schedule, carries the insurance the owner demands, and answers to the owner when something goes wrong. If you want to know what a prime contractor is in practical terms, it is the one name on the contract the owner can point to when there is a problem, and the one firm with legal duties to almost everyone else on site.
Prime Contractor vs. General Contractor
People use the two terms interchangeably, and in private building work that usually causes no harm. The distinction matters in government contracting. A prime contractor is any firm with a direct contract with the owner, regardless of trade or project size. A plumbing company that contracts directly with a federal agency to replace a building’s piping is the prime on that job. A general contractor is the firm that manages the full scope of a building project and coordinates every trade on it. Every general contractor is a prime contractor on the projects it leads, but not every prime contractor is a general contractor.
Running the Job Site
The prime contractor runs daily operations. That means building and maintaining the master schedule, tracking material deliveries, controlling site access, and verifying that the work in place matches the drawings and specifications in the contract documents. When two trades need the same space on the same day, the prime decides who goes first.
Safety is where this role carries the most personal exposure. OSHA treats the prime contractor as a “controlling employer” on multi-employer construction sites, which means the prime can be cited for hazards it did not create as long as it had authority to correct the problem or require the responsible subcontractor to fix it. Reasonable care requires periodic worksite inspections and a working system for identifying and correcting hazards.1Occupational Safety and Health Administration. Multi-Employer Citation Policy – Controlling Employer A prime cannot hand safety off to each sub and walk away. If an electrical sub leaves exposed wiring in a common area and the prime never catches it, OSHA can hold the prime responsible even though none of the prime’s own workers were ever exposed to the hazard.
The Contract With the Owner
The prime’s agreement with the owner creates privity of contract. Only the parties to that agreement can enforce its terms against each other.2Legal Information Institute. Privity of Contract In normal practice the owner has no direct legal relationship with the subcontractors. If a drywall sub botches an entire floor, the owner sues the prime, and the prime turns around and pursues the sub.
That single-point-of-liability structure cuts both ways. The prime also absorbs the consequences of delay. Many construction contracts carry liquidated damages clauses setting a fixed daily dollar amount the prime owes for finishing late. Federal contracts authorize these clauses when timely delivery matters and actual damages would be hard to prove.3Acquisition.GOV. FAR Subpart 11.5 – Liquidated Damages Private contracts often include the same thing. Some contracts also include a “no damages for delay” clause, which limits the prime’s remedy when the owner causes the delay to a time extension rather than money. Most courts enforce those clauses, with narrow exceptions for bad faith or delays so extreme no one contemplated them at signing.
Managing Subcontractors and Change Orders
Prime contractors rarely perform every trade themselves. They hire electricians, plumbers, steel erectors, and dozens of other specialty firms. The prime’s subcontracts typically include flow-down provisions that pass the prime’s own obligations to the owner down to each sub. If the prime contract requires a specific inspection schedule or material certification, each subcontract should mirror it.
Scope changes are inevitable. When the owner wants to add work, swap materials, or redesign a portion of the project, that change should be documented in a written change order before the work starts. Federal projects follow specific procedures and usually require a standardized form.4Acquisition.GOV. FAR Subpart 43.2 – Change Orders A harder situation is the constructive change, where the owner’s actions effectively alter the contract requirements without any paperwork. Federal agencies define this as an act or omission by a government official that has the practical effect of a written change.5U.S. Department of Energy. Constructive Change If an inspector rejects work that meets the specifications and demands a higher standard, the prime may be entitled to additional compensation. Contemporaneous documentation is what makes those claims recoverable.
Paying the People Below You
The prime sits at the center of the project’s money flow. The owner pays the prime for completed milestones or monthly progress, and the prime distributes those funds down to subcontractors and suppliers.
Prompt Payment
On federal construction projects, the Prompt Payment Act requires the prime to pay each subcontractor within seven days of receiving payment from the government. Late payments trigger interest penalties at a rate set by the Secretary of the Treasury.6Office of the Law Revision Counsel. 31 U.S.C. Chapter 39 – Prompt Payment Most states have their own prompt payment statutes for non-federal work. Deadlines vary, but the logic is consistent. The people doing the physical work should not have to finance the project while the prime sits on their money.
Retainage
Owners routinely withhold a percentage of each progress payment as retainage, released only after the project is substantially complete. On federal contracts, retainage cannot exceed 10 percent of the approved payment amount.7Acquisition.GOV. FAR 32.103 – Progress Payments Under Construction Contracts Private contracts typically withhold between 5 and 10 percent. Many states require the retainage rate to drop once the project passes a completion milestone, such as going from 10 percent to 5 percent at the halfway point. The prime has to manage the cash-flow pressure retainage creates, both on its own books and in what it withholds from its subs.
Mechanic’s Liens and Payment Bonds
When the owner fails to pay on a private job, the prime’s most powerful remedy is a mechanic’s lien, a legal claim recorded against the property itself. Prime contractors generally have more straightforward lien rights than subs because the direct contract with the owner removes most of the preliminary-notice hurdles subs face. Notice requirements, filing deadlines, and amount caps vary by state. On federal projects, mechanic’s liens are not available against government property; the Miller Act payment bond takes their place.
Federal Project Obligations
A prime contractor on federal work carries duties that do not apply to purely private jobs.
Miller Act Bonds
Before a federal construction contract worth more than $100,000 is awarded, the prime must post two bonds. A performance bond guarantees the work will be completed, and a payment bond guarantees that subcontractors and suppliers will be paid.8Office of the Law Revision Counsel. 40 U.S.C. 3131 – Bonds of Contractors of Public Buildings or Works The payment bond must equal the total contract price unless the contracting officer determines that amount is impractical. A subcontractor with a direct contract with the prime can claim against the payment bond if it goes unpaid. A supplier or second-tier sub without that direct contract must send the prime written notice within 90 days of its last day of work or last material delivery before filing a bond claim.9Office of the Law Revision Counsel. 40 U.S.C. 3133 – Rights of Persons Furnishing Labor or Material Most states impose similar requirements on state and local public work through “Little Miller Acts.”
Davis-Bacon Wages
Any federal construction contract over $2,000 triggers the Davis-Bacon Act, which requires the prime to pay all laborers and mechanics on the project at least the locally prevailing wage rate set by the Department of Labor.10Office of the Law Revision Counsel. 40 U.S.C. 3142 – Rate of Wages for Laborers and Mechanics The same obligation flows down to every subcontractor. Violations can lead to contract termination, debarment from future federal work, and withholding of payments to cover the wage shortfall. Because the dollar threshold is so low, this applies to nearly every federal construction project.
Small Business Subcontracting Plans
Large businesses holding federal contracts valued at $750,000 or more must submit a small business subcontracting plan.11Vendor Support Center. Subcontracting for Prime Contractors The plan must include separate goals, expressed in both dollars and percentages, for subcontracting with small businesses, veteran-owned firms, service-disabled veteran-owned firms, HUBZone businesses, small disadvantaged businesses, and women-owned businesses.12eCFR. 48 CFR 52.219-9 – Small Business Subcontracting Plan Small businesses awarded a prime contract are exempt. Failing to make a good-faith effort toward these goals can trigger liquidated damages and jeopardize future awards.
Permits
Federal construction contracts generally require the prime to obtain all necessary licenses and permits and to comply with every applicable federal, state, and local law at its own expense.13Acquisition.GOV. FAR 52.236-7 – Permits and Responsibilities Private contracts typically say the same thing.
Insurance and Indemnification
Most owners require the prime contractor to carry commercial general liability insurance and workers’ compensation coverage at a minimum. Depending on the project, the owner may also demand professional liability, builder’s risk, or umbrella coverage with higher limits. The owner is often named as an additional insured on the prime’s general liability policy.
Beyond insurance, construction contracts almost always include an indemnification clause under which the prime agrees to defend and compensate the owner for third-party claims arising from the contractor’s work. The duty to defend is broader than the duty to indemnify. It kicks in as soon as a claim is made that could result in liability, not after liability is established, which means the prime may be paying the owner’s legal costs from the moment a lawsuit is filed, even if the prime ultimately bears no fault. A growing number of states restrict broad-form indemnification clauses that shift all risk to the contractor regardless of who caused the harm.
Termination
A prime’s contract can end in two very different ways.
Default
When a prime fails to perform, the owner can terminate for default, but not without notice. On federal projects, the contracting officer must send a written cure notice identifying the specific failure and giving the contractor at least 10 days to fix it.14Acquisition.GOV. FAR 49.402-3 – Procedure for Default If the contractor does not cure within that window, the government can terminate and hold the contractor liable for the cost of hiring a replacement to finish the work. Private contracts set their own procedures, but most require written notice and an opportunity to cure.
Convenience
Federal contracts give the government the right to terminate at any time for its convenience, even when the contractor has done nothing wrong. The contractor must stop work immediately, terminate affected subcontracts, and transfer completed work to the government.15eCFR. 48 CFR 52.249-2 – Termination for Convenience of the Government (Fixed-Price) In return, the contractor is entitled to payment for completed work, costs already incurred on the terminated portion, reasonable profit on work performed, and settlement expenses. The final settlement proposal is due within one year of the termination date. This concept surprises contractors new to government work, but it appears in nearly every federal contract.
Liability After the Ribbon Is Cut
A prime contractor’s exposure does not end when the project is finished. Every state has a statute of repose setting an absolute deadline for filing construction defect claims, typically ranging from 4 to 15 years after substantial completion, with 10 years being the most common. Unlike a statute of limitations, which starts running when the defect is discovered, a statute of repose runs from completion regardless of when anyone finds the problem. A latent foundation crack discovered in year 12 would be time-barred in a state with a 10-year repose period, even if no one could have detected it earlier. For the prime, that means both the risk and the eventual peace of mind are measured in years, not days.