A subcontractor in construction is an independent business that a general contractor hires to carry out a specific trade or scope of work on a project. The subcontractor runs its own company, brings its own crew and equipment, carries its own insurance, and controls how the assigned work actually gets done. It is not an employee of the general contractor, and it has no direct contract with the property owner.
That structure is what makes modern construction possible. A single building project might involve a dozen trades, each requiring specialized licensing, equipment, and code knowledge. The general contractor coordinates them; the subcontractors deliver the work.
Subcontractor vs. Employee: Where the Line Falls
The defining feature of a subcontractor is independence. The IRS applies a three-part test to decide whether a worker is truly an independent contractor or has been misclassified as one, and the labels in the contract do not control the outcome. What matters is how the work actually happens.1IRS. 2026 Publication 15-A
- Behavioral control. A subcontractor decides how to achieve the agreed result, including the sequence of tasks, the tools, and which workers to bring. If the hiring party dictates when, where, and how, the relationship looks like employment.
- Financial control. Subcontractors carry unreimbursed business expenses, invest in their own equipment, market their services, get paid by the job or at a flat rate, and can earn a profit or take a loss on any given project.
- Type of relationship. Benefits such as health insurance, retirement contributions, or paid vacation point toward employment, as does an open-ended arrangement with no defined endpoint.
A licensed roofer who operates under a business name, carries insurance, contracts for a flat price, hires their own crew, and bears responsibility for callbacks is a subcontractor. A worker who shows up when told, uses the general contractor’s tools, and gets paid by the hour looks like an employee no matter what the paperwork says.1IRS. 2026 Publication 15-A
Where Subcontractors Sit in the Project Hierarchy
On a typical project, the property owner signs a prime contract with the general contractor. The general contractor then enters separate subcontracts with each trade. The subcontractor’s legal relationship runs through the general contractor, not the owner. This is sometimes called privity of contract, and it means the subcontractor’s obligations for scheduling, performance, and payment all flow through the GC.
For the owner, this keeps things simple: one contract, one party answerable for the overall result. If the owner has a complaint about plumbing or drywall, that complaint goes to the general contractor, who then takes it up with the responsible sub.
Most subcontracts spell out how the arrangement can end. Termination for cause lets the general contractor fire a subcontractor who is failing to perform, and the subcontractor can be held liable for the cost of a replacement. Termination for convenience lets the general contractor end the subcontract even without any fault, but the subcontractor is entitled to be paid for work already completed.
Common Trades and What They Supply
Subcontracted trades commonly include plumbing, electrical, HVAC, framing, concrete, roofing, painting, and structural steel. Each one operates within a tightly defined scope dictated by the project plans and building codes.
These specialists provide both the skilled labor and the trade-specific materials for their portion of the job. A plumbing subcontractor supplies the pipe, fixtures, and fittings as well as the crew that installs them. Concentrating on one discipline is what lets subcontractors maintain the expertise needed for complex systems like high-voltage wiring or fire suppression.
What the Subcontract Agreement Actually Controls
The subcontract defines every legal boundary of the relationship. A few elements show up in nearly every well-drafted agreement.
Scope of Work and Flow-Down Clauses
A detailed scope of work, drawn from the architectural plans and engineering specifications, states exactly what the subcontractor must deliver. The subcontract should also reference the prime contract. Flow-down clauses pull the prime contract’s quality standards, scheduling milestones, and safety requirements into the subcontractor’s obligations, so the sub cannot deliver work that conflicts with what the owner specified.
Insurance and Indemnification
Subcontracts routinely require commercial general liability coverage, often with minimum per-occurrence limits of $1,000,000 or more, plus workers’ compensation. The exact minimums depend on the project’s size, location, and owner requirements.
Indemnification clauses require the subcontractor to defend the general contractor against claims arising from the subcontractor’s work. A majority of states have anti-indemnity statutes that limit or prohibit “broad form” indemnification, meaning a subcontractor cannot be forced to cover losses caused by the general contractor’s own negligence. Enforceability turns on the law of the state where the project sits.
Change Orders
Projects rarely run exactly to plan. When the scope shifts because of design revisions, unforeseen site conditions, or owner requests, the subcontract should require a signed written change order before any extra work begins. Doing the extra work first and asking for payment later is one of the fastest ways a subcontractor loses money, because proving entitlement after the fact is much harder than pointing to an authorized document.
How Subcontractors Get Paid
Payment terms are among the most consequential parts of the subcontract, and two clauses in particular shift risk in very different directions.
Pay-When-Paid
A pay-when-paid clause sets a timing rule: the general contractor pays the subcontractor within a stated number of days after receiving funds from the owner. Most courts read these clauses as governing only timing. If the owner is slow, the sub’s check can be slow, but the obligation to pay does not disappear.
Pay-If-Paid
A pay-if-paid clause goes further. It makes the owner’s payment to the general contractor a condition that must be satisfied before the subcontractor has any right to be paid at all. If the owner never pays, the subcontractor may have no contractual claim against the general contractor. Courts have treated the phrase “condition precedent” as the signal that the parties meant to shift the risk of owner nonpayment onto the sub. California, North Carolina, South Carolina, and Wisconsin have banned pay-if-paid clauses as a matter of public policy. In other states, the clause is enforceable when the language is clear.
Retainage
General contractors typically withhold a percentage of each progress payment, called retainage, as a cushion to ensure the subcontractor finishes the work and corrects defects. Rates usually run 5 to 10 percent, and a growing number of states cap retainage by statute. The withheld funds are released after the sub’s work reaches substantial completion, with the exact timing set by the contract and state law.
What Happens When the Subcontractor Doesn’t Get Paid
Because the subcontractor has no direct contract with the owner, the law provides separate payment remedies that reach past the general contractor.
Mechanic’s Liens on Private Projects
A mechanic’s lien is a legal claim that attaches to the property itself, creating an encumbrance on title that can block a sale or refinance until the debt is resolved. State law gives lien rights to anyone who improves a property through labor or materials, even without a contract with the owner.
These rights come with strict deadlines. Many states require a preliminary notice near the start of the project to preserve the right to lien later; some require it within 20 days of starting work, others set different timeframes, and a few require no preliminary notice at all. If the debt stays unpaid after the lien is filed, the subcontractor can pursue foreclosure to collect from the property’s value. Missing a deadline by a single day can permanently forfeit the lien.
Licensing matters here. Most states require subcontractors in trades like electrical, plumbing, and HVAC to hold a valid license, and working without one can wipe out the right to enforce the contract, sue for payment, or file a lien. The specifics vary by state, but an unlicensed sub can end up with no legal remedy if the general contractor refuses to pay.
Payment Bonds on Federal Projects
Mechanic’s liens do not work against federal property, because the government’s real estate cannot be encumbered by private claims. The Miller Act fills that gap by requiring contractors on federal construction projects over $100,000 to obtain a payment bond that guarantees payment to subcontractors and material suppliers.2Office of the Law Revision Counsel. 40 U.S. Code 3131 – Bonds of Contractors of Public Buildings or Works A subcontractor with a direct contract with the prime contractor can file suit on the bond starting 90 days after their last day on the project, and no later than one year after that date.3General Services Administration. The Miller Act Many states have enacted “little Miller Acts” that impose similar bonding requirements on public projects within their jurisdictions.
Safety Responsibility on a Shared Worksite
Construction sites are multi-employer worksites, and OSHA assigns safety duties based on each employer’s role rather than only on who created the hazard. The agency recognizes four roles: the employer who created the hazard, the employer whose workers are exposed to it, the employer responsible for correcting it, and the controlling employer with general supervisory authority over the site.4OSHA. Multi-Employer Citation Policy
Subcontractors most often sit in the exposing-employer category: their workers face a hazard that another trade may have created. Even then, OSHA can cite the subcontractor if it knew or should have known about the hazard and failed to take protective steps, such as warning employees, asking the controlling employer to fix the problem, or putting alternative safeguards in place.4OSHA. Multi-Employer Citation Policy The general contractor, usually the controlling employer, has to exercise reasonable care across the whole site through periodic inspections, a system for correcting hazards, and graduated consequences for noncompliant subs.
Prevailing Wages on Federally Funded Work
Subcontractors on federally funded construction over $2,000 must comply with the Davis-Bacon Act, which requires paying workers at least the locally prevailing wages and fringe benefits for similar work in the area. The U.S. Department of Labor sets these rates project by project. On prime contracts over $100,000, the Contract Work Hours and Safety Standards Act layers on an overtime rule: time and a half for all hours worked beyond 40 in a workweek. Covered subcontractors also submit weekly certified payroll reports, and noncompliance can mean withheld payments, termination, or debarment from future federal work.5U.S. Department of Labor. Davis-Bacon and Related Acts These rules apply only to federally funded projects; private work is governed by whatever the contract and state wage law require.
Why Misclassification Is a Real Risk
Calling a worker a subcontractor does not make them one. The Department of Labor has flagged construction as an industry where misclassification is common, and workers who should have been treated as employees lose protections including minimum wage, overtime, and Family and Medical Leave Act coverage.6U.S. Department of Labor. Employee or Independent Contractor Classification Under the Fair Labor Standards Act
On the tax side, the IRS can reclassify a worker and hold the hiring business liable for back employment taxes, including the employer’s share of Social Security and Medicare plus income tax withholding. Either the worker or the business can file IRS Form SS-8 to request an official determination of worker status at no cost.7IRS. Instructions for Form SS-8 For someone who is being paid as a subcontractor but treated like an employee, that form is one of the most direct ways to force the question.