How to Write a Subcontractor Agreement: What Every Contractor Needs to Include

It’s 8:15 a.m. on a Tuesday and the framing crew hasn’t shown up. You call the sub, and he says he pulled his guys to finish a bigger job across town because “nothing was signed saying I had to be here today.” Now you’re explaining a schedule slip to the owner, your electrician is standing around with nothing to rough in, and you realize the “understanding” you had with your framer was never actually written down.

This scenario plays out on job sites every week, and it’s almost always preventable. A verbal agreement or a one-page handshake deal might work fine — until it doesn’t. The moment there’s a disagreement about money, timeline, or quality of work, the only thing that protects you is what’s in writing. A solid subcontractor agreement isn’t paperwork for paperwork’s sake. It’s the document that determines who gets paid, who’s liable when something goes wrong, and whether a dispute costs you a phone call or a lawsuit.

This guide covers what a subcontractor agreement needs to include, the mistakes that trip up even experienced contractors, and how to decide whether a template is enough or you need an attorney.

Why a Written Agreement Beats a Handshake Deal Every Time

Handshake deals survive as long as everyone remembers the same conversation the same way. The problem is that memory is unreliable, jobs change scope constantly, and money makes people remember things differently than they actually happened.

A written subcontractor agreement matters because it:

• Creates a record both parties agreed to. When there’s a dispute, you’re not relying on “he said, she said” — you’re pointing to a signed document.
• Protects your license and your business. General contractors are often held responsible for a subcontractor’s work, insurance lapses, or unpaid lower-tier subs. A clear contract limits your exposure.
• Prevents scope creep. Without defined boundaries, “just one more thing” requests pile up fast, and unpaid extra work eats your margin.
• Establishes payment expectations up front. Subs who know exactly when and how they’ll get paid are less likely to walk off a job or file a lien out of frustration.
• Gives you leverage if something goes wrong. Courts, mediators, and even insurance adjusters look at the contract first. If it isn’t written down, it’s very hard to enforce.

None of this requires a 40-page document — just a clear, complete agreement both sides actually read before signing.

The Core Sections Every Subcontractor Agreement Should Include

Every trade and job is different, but this framework holds up across residential, commercial, and public works — whether you’re hiring a two-person electrical crew or a large mechanical sub.

1. Scope of Work

This is the most important section and the one most often written too loosely. “Framing per plans” is not a scope of work — it’s an invitation to argue later about what was actually included.

A strong scope of work section should specify:

• The exact tasks the subcontractor is responsible for (and, just as important, what they are not responsible for)
• The plans, specifications, and drawings the work must conform to, referenced by date or revision number
• Materials the sub is supplying versus materials you or the owner are supplying
• Quality standards or codes the work must meet
• Any exclusions (demo, cleanup, permits, disposal) spelled out explicitly

If it isn’t in the scope, assume it becomes a change order argument.

2. Payment Terms

Payment disputes are the single most common source of subcontractor conflict. Spell out:

• Total contract price or the unit-price/time-and-materials basis if the job isn’t a fixed sum
• Payment schedule — draws tied to milestones (e.g., rough-in complete, final inspection passed) rather than vague timeframes
• Retainage — how much (commonly 5-10%) and when it’s released
• Invoice requirements — what documentation the sub must submit to trigger payment
• Payment timing — how many days after invoice or milestone approval payment is due
• A “pay-if-paid” or “pay-when-paid” clause if you want subcontractor payment tied to your own receipt of payment from the owner (these clauses are restricted or unenforceable in some states, so confirm local law before relying on one)

3. Schedule and Timeline

A schedule section should include:

• Start date and substantial completion date, or a reference to the master project schedule
• Specific milestones the sub is responsible for hitting
• Notice requirements if the sub anticipates a delay
• Language addressing liquidated damages or back-charges if the sub’s delay pushes the overall project timeline — and equally, protection for the sub if delays are caused by others

4. Change Order Process

Scope changes are inevitable. What causes fights is not having a process for them. Your agreement should require that:

• No extra work is performed, and no additional payment is owed, without a written change order signed by both parties before the work begins
• Change orders specify the added/removed scope, price adjustment, and any schedule impact
• Verbal instructions from a superintendent or foreman don’t count as authorization — only signed change orders do

This single clause prevents more disputes than almost any other part of the contract.

5. Insurance and Indemnification Requirements

Before a subcontractor sets foot on site, your agreement should require:

• Certificates of insurance naming you (and often the property owner) as an additional insured on general liability coverage
• Minimum coverage limits appropriate to the trade and project size
• Workers’ compensation coverage for all of the sub’s employees, with proof provided before work starts
• Auto liability if the sub’s vehicles will be on site or transporting materials
• An indemnification clause stating the subcontractor will defend and hold you harmless for claims arising from their negligence or work

Don’t let a sub start “and get the certificate over later” — certificates that never arrive are a recurring, expensive problem.

6. Lien Waiver Requirements

Mechanic’s liens are one of the fastest ways a project gets tangled up financially. Your agreement should require the subcontractor to:

• Provide a conditional lien waiver with each payment application
• Provide an unconditional (final) lien waiver once payment actually clears, before the next payment is released
• Confirm that all of their own lower-tier subs and suppliers have been paid, so no one further down the chain can file a lien against the property

Lien waiver rules and forms vary by state, so use the language appropriate to where the project is located.

7. Dispute Resolution

Decide in advance how disagreements will be handled rather than figuring it out mid-argument. Common approaches include:

• Mediation first, before either party can pursue litigation or arbitration
• Binding arbitration instead of a courtroom, which is often faster and less expensive
• A choice-of-law and venue clause specifying which state’s laws apply and where any dispute will be heard
• A clause addressing attorney’s fees — whether the losing party covers the winning party’s legal costs

8. Termination Clauses

Every agreement should spell out how it can end, including:

• Termination for cause — what counts as a material breach (missed deadlines, poor workmanship, insurance lapse, safety violations) and what cure period, if any, the sub gets before termination
• Termination for convenience — your right to end the agreement even without a breach, and how the sub gets paid for work completed to that point
• What happens to materials, equipment, and warranties if the relationship ends mid-project

Common Mistakes Contractors Make in Subcontractor Agreements

Even contractors who use written agreements often undercut their own protection with a few recurring errors:

• Using a generic template and never customizing it. A template written for residential remodels doesn’t fit a municipal infrastructure job, and vice versa.
• Leaving the scope of work vague to “keep things simple,” then being surprised when the sub disputes what was included.
• Not requiring insurance certificates before work starts, which can leave you exposed if an injury happens on day one.
• Skipping the change order requirement in practice, even when it’s written into the contract — verbally approving extra work “just this once” undermines the whole clause.
• Failing to specify payment timing precisely. “Payment due promptly” means nothing in a dispute. “Payment due within 15 days of approved invoice” does.
• Not keeping signed copies organized. An agreement that exists but can’t be produced when needed is nearly as bad as no agreement at all.
• Reusing an outdated contract that doesn’t reflect current lien law, insurance minimums, or your standard payment terms.

Subcontractor or Employee? Why the Distinction Matters

A subcontractor agreement only holds up if the relationship is actually a subcontractor relationship — not an employee relationship in disguise. Misclassifying a worker as a subcontractor when they function like an employee can expose you to back taxes, penalties, and unpaid overtime claims.

Generally, a worker looks more like an independent subcontractor when they:

• Control how, when, and with what methods the work gets done, rather than following your direct daily supervision
• Use their own tools, equipment, and often their own crew
• Carry their own insurance and business licensing
• Are paid by the job or contract, not an hourly wage tied to your payroll
• Are free to work for other contractors at the same time

If you’re dictating hours, providing all tools, supervising work minute-to-minute, and the person works exclusively for you, that relationship may look like employment regardless of what the contract calls it. This is a brief overview, not a substitute for a proper classification review — worker classification rules involve multiple factors and vary by agency and state, so if you’re unsure, get a professional opinion before it becomes a payroll audit problem.

Template or Attorney: Which Do You Actually Need?

A template can work when:

• You’re an established contractor with a standard scope of trade and project size
• The job is straightforward, moderate in value, and governed by well-understood local practices
• You’re willing to actually customize the template’s scope, payment, and insurance sections for each job rather than copy-pasting blindly

It’s worth hiring an attorney when:

• You’re working on public works or government contracts with specific compliance requirements
• The project value is large enough that a dispute would meaningfully hurt your business
• You want a “pay-if-paid” clause, liquidated damages, or an indemnification clause reviewed for enforceability in your state
• You’ve had a previous subcontractor dispute and want language that closes the gap that caused it
• You operate across multiple states with different lien and licensing laws

A reasonable middle ground: have an attorney draft or review a master template once, then reuse and lightly adapt it per job — solid legal footing without a full review every time.

Practical Tips for Using Subcontractor Agreements on Real Jobs

• Get it signed before work starts — not after the first day, not after the first payment request.
• Attach the plans and specs referenced in the scope of work directly to the contract, or clearly identify the version and date.
• Keep a signed copy accessible on site, not just filed in an office drawer.
• Review payment and insurance status before every draw, not just at the start of the job.
• Update your template periodically — lien laws, insurance minimums, and your own standard terms change over time.
• Walk new subs through the key terms verbally, even if they’ve signed the document. A quick conversation about payment timing and change order rules prevents a lot of confusion later.

Bottom Line

A subcontractor agreement isn’t about distrust — it’s about making sure everyone on the job knows exactly what’s expected, when they’ll get paid, and what happens if something goes sideways. The contractors who avoid the worst disputes aren’t the ones with the fanciest paperwork; they’re the ones who actually use clear, complete agreements on every job, every time.

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Disclaimer: This article is for general informational purposes only and does not constitute legal advice. Subcontractor agreement requirements, lien laws, and worker classification rules vary by state and jurisdiction. Consult a licensed attorney in your state before drafting, signing, or relying on any subcontractor agreement for your specific situation.