A construction subcontractor agreement is a written contract between a general contractor (GC) and a specialty trade firm — framing, electrical, plumbing, HVAC — defining the work, price, timeline, insurance requirements, and lien-waiver obligations before any work begins. Without one, the GC carries full exposure if the sub walks off the job, files a mechanics lien, or causes third-party injury. The document you execute before mobilization is the only evidence a court will consider.
Why a handshake deal destroys your project budget
Most disputes between GCs and subcontractors trace back to an ambiguous or absent written agreement. When a framing sub walks off because the owner changed the floor plan and the GC has nothing in writing, the GC may owe delay damages to the owner while having no written basis to terminate the sub for cause. Under the common law doctrine of substantial performance, an oral promise to pay for construction work is still enforceable — but the scope of that promise is anyone's guess in court.
The Miller Act (40 U.S.C. § 3131 et seq.) requires payment bonds on federal contracts over $150,000. State "Little Miller Acts" mirror this for most public contracts, with bond thresholds ranging from $25,000 to $500,000 depending on the jurisdiction. A sub working without a written agreement and a clear bond-claim path on a public project is exposed in ways that rarely surface until a contractor defaults.
What the scope of work section must include
The scope section is the contract's spine. Courts interpreting construction disputes look first at whether the written scope matches what the sub actually performed. A scope that says "all electrical work" on a commercial building leaves every change order open to argument. A scope that cites specific specification sections from the project drawings — CSI MasterFormat divisions, drawing sheet numbers, and the bid package reference — gives both parties an unambiguous starting point.
Include these items in every scope section:
- Project address and permit number — ties the agreement to a specific structure and legal description
- Drawing and specification revision date — so both parties know which version of the plans is the contract document
- Inclusions and exclusions — spell out what the sub is not responsible for (temporary power, disposal of hazardous materials, third-party inspections)
- Commencement and substantial completion dates — with reference to a project schedule attached as an exhibit
- Change order procedure — a written, signed change order requirement before extra work begins is the single most litigation-preventive clause you can add
Flow-down clauses: what they are and why they matter
Flow-down clauses (sometimes called pass-through or conduit clauses) incorporate the prime contract between the owner and the GC into the subcontract. A typical provision reads: "All terms and conditions of the prime contract, to the extent applicable to the Subcontractor's scope of work, are incorporated herein by reference." The practical effect is that the sub is bound by dispute resolution procedures, liquidated damages, and termination rights even if those provisions are never negotiated directly.
The risk for subs: many never read the prime contract before signing. A sub that accepts a flow-down clause without reviewing may be accepting a mandatory arbitration forum in a distant city, a "no-damage-for-delay" provision (enforceable in most states outside of Washington and a few that have carved out statutory exceptions), or an indemnity obligation that exceeds the sub's insurance limits. Attach the prime contract as an exhibit and require the sub to acknowledge receipt in writing.
Insurance requirements: the numbers courts actually examine
An insurance section with wrong limits is nearly as dangerous as no insurance section. Standard minimums on commercial construction projects in 2026 are: CGL at $1,000,000 per occurrence / $2,000,000 aggregate under ISO form CG 00 01; Workers' Compensation at statutory limits with Employers' Liability at $500,000 per occurrence; Auto Liability at $1,000,000 combined single limit; and Umbrella/Excess at $5,000,000 on larger projects.
The subcontract should require the sub to name the GC — and often the owner — as additional insureds using ISO form CG 20 10 (ongoing operations) and CG 20 37 (completed operations). Additional-insured status without the right endorsement form is worthless: many carriers issue certificates showing AI status but attach endorsements limiting coverage to vicarious liability only. Specify that the sub's insurance is primary and non-contributory, or a claim may trigger the GC's own policy first.
Prevailing wage: federal and state triggers
The Davis-Bacon Act (40 U.S.C. § 3141–3148) requires workers on federal and federally assisted construction projects to be paid no less than the locally prevailing wage determined by the Department of Labor. The wage determination is project-specific and published in the prime contract. A GC who fails to pass Davis-Bacon obligations to subs in writing carries direct liability for any underpayment — back wages, potential debarment from future federal contracting, and, where overtime violations are also present, liquidated damages under the Contract Work Hours and Safety Standards Act.
Thirty-one states have their own prevailing wage laws for state-funded projects. California's Prevailing Wage Law (Labor Code § 1770 et seq.) is the most litigated: it requires certified payroll records on DIR Form A-1-131, overtime at 1.5× after 8 hours in a day, and posting of wage determinations on-site. Omitting certified payroll requirements from a California public works subcontract exposes both the GC and sub to penalties of $200 per worker per day under Labor Code § 1775.
Lien waivers: conditional vs. unconditional
The mechanics lien is the most powerful collection tool available to subs. Under lien statutes adopted across most states, a lien attaches to the property being improved, and an unpaid sub can force a sale of the property — regardless of whether the owner already paid the GC. Subcontracts control this risk through lien waivers at each payment milestone.
Two types apply. A conditional waiver releases lien rights only if and when payment clears — the AIA G706A form and California's Civil Code § 8132 form both work this way, and they are safe to sign before payment arrives. An unconditional waiver releases lien rights through a specific date regardless of whether the sub has been paid. Signing one before payment clears is among the most common and costly mistakes in construction.
California requires the use of statutory forms under Civil Code §§ 8132–8138. Other states permit custom language, which opens the door to GC-drafted waivers that release claims well beyond the current pay period. Attach the agreed waiver form as an exhibit to the subcontract.
Termination clauses: for cause and for convenience
Every subcontract needs two termination provisions. Termination for cause allows the GC to remove the sub after a defined default — failure to man the job, persistent defective work, safety violations — with a cure period (typically 48–72 hours for urgent safety issues, 7 days for other defaults). Termination for convenience allows the GC to end the relationship even without default, compensating the sub only for work performed and reasonable demobilization costs. A negotiated cap on the convenience termination right — limiting it to owner-initiated scope reductions — is worth pursuing on larger subcontracts.
Dispute resolution and pay-when-paid
Most commercial subcontracts include a "pay-when-paid" clause stating the sub will be paid within a set number of days after the GC receives payment from the owner. Courts in California (Civil Code § 8800), New York (Lien Law Art. 3-A trust fund provisions), and Texas (Property Code Ch. 28, Prompt Payment to Contractors and Subcontractors) have limited how aggressively these clauses can shift payment risk. A "pay-if-paid" clause — which conditions payment on the GC ever receiving funds — requires explicit language and is unenforceable in some states.
Dispute resolution should specify the governing state law, whether disputes go to arbitration (AAA Construction Industry Rules are the most common) or litigation, the venue, and whether the prevailing party recovers attorney's fees. California's Civil Code § 1717 allows fee-shifting provisions to be reciprocal even if the contract drafts them one-sided.
Using a template to build from
A free construction subcontractor agreement template at forms-legal.com covers the standard clause structure — scope, schedule, insurance, lien waivers, termination, and dispute resolution — in a format that works across most states. Edit it to reflect the scope exhibit, drawing revision date, prime-contract insurance minimums, and the lien-waiver form your state mandates.
Before the sub mobilizes: the pre-execution checklist
Confirm these items are in place before any work begins:
- Signed subcontract with scope exhibit and project schedule attached
- Certificate of insurance with CG 20 10 and CG 20 37 endorsements, primary/non-contributory language, and waiver of subrogation
- Subcontractor's license number verified with the state licensing board
- Prevailing wage determination attached if the project is publicly funded
- Lien waiver form agreed upon and attached as an exhibit
A subcontractor agreement is the document that determines who bears the cost when things go wrong — and in construction, something always does. Get the agreement signed, have the insurance certificates reviewed by someone who understands endorsement forms, and keep a copy with the project file from mobilization through the warranty period.
Need the document itself? Download the free template →
This article is general information, not legal advice — see our accuracy & editorial policy. Confirm the cited law is current before relying on it.