A subcontract is a separate agreement in which a prime contractor hands off part of its contracted work to another firm, called the subcontractor. It sits beneath the original contract between the project owner and the prime contractor rather than replacing it, and it binds the subcontractor to the prime contractor, not to the owner. The arrangement is common wherever a single company rarely has every specialty a complex project needs, including construction, defense, and IT.
Who Is Bound to Whom
Every subcontracting arrangement begins with a project owner, sometimes called the client or, on government work, the contracting agency. The owner signs a prime contract with a lead firm that takes on full responsibility for delivering the finished project. That lead firm is the prime contractor.
When the prime contractor identifies work that falls outside its own capabilities or capacity, it hires one or more subcontractors under separate agreements. Those subcontractors take direction from, and get paid by, the prime contractor. The owner typically has no direct dealings with any subcontractor and may not even know which firms are on the job. In federal procurement, this structure is formalized: the government holds the prime contractor fully responsible for performance regardless of how the work is divided.1Acquisition.GOV. Subpart 9.6 – Contractor Team Arrangements
The chain can extend further. A subcontractor may hire its own lower-tier subcontractors to handle narrower tasks. Every subcontract is derivative, meaning it exists only because the prime contract exists. If the prime contract is terminated, the subcontracts beneath it generally terminate as well.
The legal shorthand for this structure is privity of contract: only the parties who signed a contract can enforce it or be bound by it.2Cornell Law School LII / Legal Information Institute. Privity In a subcontracting arrangement, privity exists in two separate links. One connects the owner to the prime contractor. The other connects the prime contractor to the subcontractor. No direct contractual relationship connects the owner to any subcontractor. A subcontractor who finishes work perfectly but is not paid usually cannot sue the owner for the money, because the subcontractor’s contract is with the prime contractor alone. Liability runs the same way: if a subcontractor’s defective work causes damage, the owner’s claim is against the prime contractor, who then pursues the subcontractor separately.
What a Subcontract Contains
A well-drafted subcontract pins down the exact boundaries of the working relationship. No two agreements look identical, but most share the same core sections.
Scope of Work
The scope defines exactly what the subcontractor must deliver, whether that is electrical wiring on a single floor, HVAC installation across an entire campus, or software testing for one module of a larger platform. Good scope sections include technical standards, material specifications, and quality benchmarks so the subcontractor’s output meshes with the overall project design. Vague scope language is the single most common source of subcontract disputes, because it leaves room for each side to claim the other agreed to more or less work than actually intended.
Compensation and Payment Terms
Financial terms typically take one of two shapes. A fixed-price arrangement sets a lump sum for the entire scope, placing the risk of cost overruns on the subcontractor. A time-and-materials arrangement pays the subcontractor for actual labor hours at agreed hourly rates plus the cost of materials. Federal acquisition rules describe time-and-materials contracts as appropriate only when neither the extent of the work nor the costs can be estimated with reasonable confidence at the outset.3Acquisition.GOV. 16.601 Time-and-Materials Contracts
Payment timing is where subcontractors need to read carefully. A “pay-when-paid” clause ties the payment schedule to milestones or to when the prime contractor receives funds from the owner, but the prime contractor still owes the money eventually. A “pay-if-paid” clause is far more dangerous. It makes the owner’s payment to the prime contractor a condition that must be met before the prime contractor owes the subcontractor anything at all. If the owner never pays, the subcontractor absorbs the loss. Several states refuse to enforce pay-if-paid clauses as against public policy; many others enforce them as written. The difference between the two phrases is often a single word.
Flow-Down Clauses
Most subcontracts contain a flow-down provision that incorporates some or all of the prime contract’s terms into the subcontract. The subcontractor is then bound by the same quality standards, safety rules, and compliance obligations the prime contractor accepted. In federal contracting, certain clauses are mandatory flow-downs. The Federal Acquisition Regulation requires prime contractors to insert specific provisions covering ethics, whistleblower protections, cybersecurity safeguards, and small business utilization into subcontracts for commercial products and services.4Acquisition.GOV. 52.244-6 Subcontracts for Commercial Products and Commercial Services
A blanket flow-down that incorporates the entire prime contract may pull in dispute resolution procedures, liquidated damages, or insurance requirements the subcontractor never directly negotiated. Reading the prime contract before signing the subcontract is essential, yet many subcontractors skip the step.
Change Orders
Construction and government projects almost never end exactly as planned. A change order is the formal mechanism for adjusting the subcontract’s scope, price, or timeline after work has begun. Under federal rules, change orders are issued in writing and, when the new price cannot be agreed upon in advance, require a supplemental agreement reflecting an equitable adjustment to the contract terms.5Acquisition.GOV. Subpart 43.2 – Change Orders Private-sector subcontracts follow a similar pattern: document the change in writing, agree on cost and schedule impact, and don’t start the changed work until the paperwork is signed. Subcontractors who perform extra work on a handshake routinely eat the cost.
Termination
Subcontracts can end early in two basic ways. A termination for cause happens when one party materially breaches the agreement, such as the subcontractor falling hopelessly behind schedule or delivering defective work; the breaching party typically forfeits payment for incomplete work and may owe damages. A termination for convenience lets the prime contractor end the subcontract without the subcontractor having done anything wrong, usually because the owner cancelled part of the project. Under a convenience termination, the subcontractor is normally entitled to payment for work already completed plus reasonable wind-down costs.6Acquisition.GOV. 52.249-2 Termination for Convenience of the Government (Fixed-Price) Without a convenience-termination clause, early termination can become a fight over whether the subcontractor is owed anything at all.
Dispute Resolution
Many subcontracts require disputes to be resolved through mediation, arbitration, or a tiered process that starts with negotiation between project executives. Mandatory arbitration clauses are especially common in construction. Once you agree to arbitration, you typically give up the right to take the dispute to court. Some subcontracts include a flow-down dispute clause that forces the subcontractor into whatever process the prime contract established with the owner.
How a Subcontractor Gets Paid When the Prime Won’t Pay
Because privity bars most direct claims against the owner, subcontractors rely on three workarounds when payment stalls.
On federal construction projects over $100,000, the Miller Act requires the prime contractor to furnish both a performance bond and a payment bond before the contract is awarded. The payment bond exists specifically to protect subcontractors, laborers, and material suppliers. Its amount must equal the total contract price unless the contracting officer determines that amount is impractical, and it can never be less than the performance bond.7Office of the Law Revision Counsel. 40 US Code 3131 – Bonds of Contractors of Public Buildings or Works A subcontractor who has not been paid within 90 days of its last work can sue the bond, subject to notice rules that vary by tier and a one-year filing deadline.8Office of the Law Revision Counsel. 40 US Code 3133 – Rights of Persons Furnishing Labor or Material Most states have “Little Miller Act” statutes imposing similar bonding on state and local public work.
The mechanic’s lien is the second workaround and the main one on private projects. Every state has a mechanic’s lien statute that lets anyone who furnished labor or materials for a construction project place a claim against the improved property itself. A subcontractor who was not paid can, in effect, encumber the owner’s real estate even though no contract exists between them. The owner usually cannot sell or refinance until the lien is resolved. Mechanic’s lien rules vary widely: most states require a preliminary notice early in the project, a lien filing within a set number of days after the last work, and a lawsuit within a further deadline. Missing any of these windows usually kills the claim.
The third workaround is narrow. Under the third-party beneficiary doctrine, someone who was not a signatory can still enforce a contract if the parties intended that person to benefit from it.9Cornell Law School LII / Legal Information Institute. Third-Party Beneficiary In practice, prime contracts rarely express an intent to benefit subcontractors directly, so this theory is hard to invoke against an owner. It matters mainly where a subcontract itself names the owner as an intended beneficiary of warranty or quality obligations.
Insurance and Indemnity
Prime contractors almost always require subcontractors to carry their own insurance before stepping onto a job site. The standard package includes general liability coverage, workers’ compensation for employees, and commercial auto insurance if vehicles are used on the project. Larger commercial or government projects frequently demand higher liability limits and an umbrella policy on top of the base coverage.
Subcontractors are often required to name the prime contractor as an additional insured on their general liability policy. The endorsement gives the prime contractor a direct claim against the subcontractor’s insurer if a lawsuit arises from the subcontractor’s work. From the prime contractor’s side, this is non-negotiable. From the subcontractor’s side, it increases the number of parties drawing on the same policy limits.
Indemnity clauses complete the risk picture. A typical indemnification provision requires the subcontractor to compensate the prime contractor for losses arising from the subcontractor’s work. These clauses range from limited forms covering only the subcontractor’s own negligence to broad forms covering losses even when the prime contractor’s own negligence contributed. Many states have anti-indemnity statutes that void broad-form clauses in construction contracts, so a clause enforceable in one state may be worthless in another.
Delegation Is Not Release
One point runs through every section above: subcontracting a task does not relieve the prime contractor of its obligation to perform. The Uniform Commercial Code states the principle plainly. No delegation of performance relieves the delegating party of any duty to perform or any liability for breach.10Cornell Law School LII / Legal Information Institute. UCC 2-210 Delegation of Performance; Assignment of Rights The same rule applies in federal procurement, where the government holds the prime contractor fully responsible regardless of any team arrangement.1Acquisition.GOV. Subpart 9.6 – Contractor Team Arrangements That is why the prime contractor sits in the middle at all. The owner bargained for one party to be accountable, and farming out the work does not dilute that accountability. For the subcontractor, the flip side is equally important: both your recourse for payment and your exposure for defective work run through the prime contractor, not the owner, unless a bond claim, mechanic’s lien, or third-party beneficiary theory gives you a separate path.