What is a subcontractor in construction?
A subcontractor (sub) is a company or individual hired by a general contractor, or by another subcontractor, to perform a specific part of a construction project, usually a single trade such as electrical, plumbing, or drywall. The hiring contractor, not the owner, pays the sub. Unlike a supplier, a sub performs work on site, usually with its own labor.
A subcontractor (also written sub contractor) is the trade company that actually builds a piece of the job. The general contractor holds the contract with the owner and coordinates the whole project. Subs hold subcontracts with the GC for their trades: concrete, steel, roofing, mechanical, electrical, drywall, paint, flooring, and so on. On many commercial jobs, subs perform most of the physical work, while the GC manages schedule, coordination, money, and risk.
Some people say trade partner or specialty contractor instead. The role is the same.
How subcontractors fit on a real job
Take a $480,000 tenant improvement for a restaurant. The GC self-performs demo and rough carpentry, and buys out the rest:
| Trade | Subcontract value | Key requirements |
|---|---|---|
| Plumbing (including grease interceptor) | $78,000 | Licensed plumber, permit, health department coordination |
| HVAC and kitchen exhaust | $96,000 | Hood shop drawings, test and balance |
| Electrical | $71,000 | Licensed electrician, permit, panel schedule |
| Drywall and ceilings | $42,000 | Fire-rated assemblies per specs |
| Flooring and tile | $29,000 | Kitchen quarry tile, slip resistance |
| Paint | $14,000 | Finish schedule |
Each sub has its own scope, schedule, submittals, insurance certificate, and monthly pay app. The GC's PM collects those pay apps, rolls them into the GC's own billing to the owner, and pays the subs after the owner pays. When one sub falls behind, the hood inspection slips, the ceiling cannot close, and every trade after it waits. That chain is the reason GCs care so much about sub selection.
What GCs typically require from subs
- A license for the trade where the state or city requires one. See contractor license requirements by state.
- A current certificate of insurance meeting the subcontract limits, often with additional insured endorsements.
- A signed subcontract and W-9 before mobilizing.
- Lien waivers with every payment.
- Certified payroll on prevailing wage jobs.
- Safety program documents and, on some jobs, prequalification data such as experience, financials, and safety record.
Common problems between GCs and subs
- Slow pay. Subs wait on pay-if-paid or pay-when-paid terms, plus retainage held until project closeout.
- Scope gaps. Work nobody priced because it fell between two trades.
- Back charges. Cleanup, damage, and delay charges deducted without notice.
- Expired insurance. A sub's policy lapses mid-job and nobody notices until a claim.
- Misclassification. Treating individual workers as 1099 subs when they function as employees creates tax and insurance exposure. See construction worker classification.
Being a good sub is a business advantage. GCs keep lists of trades that show up when promised, submit clean pay apps, send insurance certificates without being chased, and price changes quickly. Those subs get invited to more bids and often get the benefit of the doubt on close calls. A sub that is hard to work with may still win on price, but usually only once.
Related terms
Related entries include lower-tier subcontractor, trade partner, subcontractor prequalification, and subcontractor default insurance. Smart Business Automator tracks each sub's contract, pay apps, lien waivers, and insurance certificates, and flags expiring documents before they become a problem.
Frequently asked questions
Is a subcontractor an employee?
A true subcontractor is an independent business, not an employee. Whether a worker is actually independent depends on federal and state tests, so classification should be checked rather than assumed.
Who pays the subcontractor?
The contractor that hired it, usually the general contractor, not the owner. Payment timing follows the subcontract and any applicable prompt payment law.
Can a subcontractor file a mechanics lien?
In most states, subs on private projects have lien rights if they follow notice and deadline rules. On public projects, they usually make claims against a payment bond instead. See your state's mechanics lien page.
What is the difference between a subcontractor and a supplier?
A subcontractor performs work on the project, usually with its own labor. A supplier sells materials or equipment. The distinction can affect lien and bond rights.
