Subcontractor agreements and the clauses that prevent disputes

A subcontractor agreement often reaches you as a thick template written by the other side. The head contractor or principal hands it over, expects a signature within days, and every clause is drafted to protect them. Before you commit, it is worth knowing which parts of the document decide whether the job runs smoothly or ends in a dispute over payment, extra work, or who owns the work you produce.

This agreement is more than a price and a start date. It defines the scope of work, how and when you get paid, what happens if the job changes, and what each party owes the other when something goes wrong. Getting these clauses right matters because a subcontractor agreement is a commercial contract, and in some industries it sits alongside a statutory regime that changes what you can agree to. This guide walks through the clauses that matter most and the traps that cause problems later.

How the scope of work is defined

The scope of work is the foundation of the agreement. It sets out the tasks you must perform, the deliverables you are responsible for, and the standard they are judged against. If the scope is vague, every other clause struggles: the price is hard to fix, a variation is hard to prove, and a dispute over whether a task was included becomes unavoidable.

A well-drafted scope of work should be specific enough that a reasonable person could look at the finished job and tell whether it matches the description. It helps to attach plans, specifications, and a schedule of rates. Watch for phrases like "all works as directed" or "any other works reasonably required", which let the principal expand what you are obligated to do without adjusting the price. The clause should pin down:

Scope of work: Name the tasks, the deliverables, and the performance standard.
Exclusions: State what is not included so silence cannot be read against you.
Timing: Link the schedule to identifiable milestones rather than loose dates.

How the price is calculated and when you get paid

The payment clause sets the amount, the schedule, and any conditions that must be met before payment falls due. In construction this is a matter of both contract and statute. Every state and territory has security of payment legislation that gives a person entitled to payment under a construction contract a fast-track claim for progress payments. In Queensland, for example, the Building Industry Fairness (Security of Payment) Act 2017 (Qld) lets a claimant give a written payment claim and, if it is disputed, take the matter to adjudication without going through a full court proceeding.

The payment clause should cover when invoices can be issued, what supporting material must accompany them, and what happens if a claim is rejected. In construction, retention money is common: a percentage withheld until the work or a defects liability period is complete. State laws increasingly require this money to be held in a dedicated trust account rather than used by the principal, so check what the agreement says about how and where that money sits. The clause should also deal with:

Progress payments: When a claim can be made and what it must include.
Retention amount: The percentage withheld, when it is released, and how it is safeguarded.
Interest or late payment: What applies if the principal pays late.

What happens if the work changes

A variation clause is the mechanism for changing the scope, the way the work is performed, or other terms once the job is underway. Without it, any change the principal requests has no agreed process, and the two sides can end up arguing over whether extra work was authorised and what it is worth.

The clause should say who can request a variation, the form it must take (usually written, before the work is done), and how the price or time is adjusted. The trap is work that goes ahead informally, on a verbal instruction or a quick email, without following the agreed process. If the contract says variations must be in writing and signed, a subcontractor who does the work anyway may find it hard to be paid for it. The clause should cover:

Required form: Written, signed variation before the work is carried out.
Pricing method: Day rates, schedule items, or a quote for each variation.
Consequences of failing to follow process: Whether the clause lets the principal refuse to pay for an unauthorised variation.

How often the two of you talk

A communication clause sets the rhythm of the relationship: regular status updates, site meetings, and reporting requirements. It matters less for its legal force than for preventing small misunderstandings from becoming large disputes. A clause that says who the authorised contact person is on each side, and how instructions and notices must be given, saves trouble later because there is no doubt about whether an email from a particular person actually bound the principal.

The drafting choice that matters is defining what counts as a formal notice, such as an instruction that can trigger a variation, versus an informal update. If the contract says formal variations must follow a specific channel, the communication clause should make it easy to comply, not easy to breach.

How the document handles events neither side controls

Force majeure covers events outside either party's control that make performance impossible or impracticable: extreme weather, equipment breakdowns, natural disasters, strikes, or government action. A subcontractor agreement should allocate the risk of these events rather than leaving the position silent.

The clause will typically define what counts as a force majeure event, what each side must do when it happens, and how long the delay can run before the parties can walk away. The trap is a definition that is too narrow, so the event you actually face is not covered, or one that suspends the subcontractor's payment rights for the whole of the delay. If you are the subcontractor, check that the clause does not let the principal hold your progress payments during a delay caused by the weather.

Who indemnifies whom and where liability stops

An indemnity is an obligation to cover another party's losses. In a subcontractor agreement this typically deals with damage to property, injury to people, or costs that flow from one party's actions on the job. Every subcontractor agreement contains these, and the drafting is about the boundaries.

The clause most worth checking is the cap on liability. A subcontractor exposing its full turnover to an unlimited indemnity has taken on enormous risk for what may be a modest fee. It is common to see a cap tied to the contract price, or an exclusion of consequential loss. The point of comparison between the two sides is here: the principal wants broad indemnities, the subcontractor wants them narrowed. Read the clause against the insurance you actually hold, because the indemnity often must sit behind your public liability and professional indemnity cover. The key points to check are:

Scope: Which losses are covered and who bears them.
Cap: A ceiling on total liability, often a multiple of the contract price.
Exclusions: What is carved out, such as indirect or consequential loss.
Insurance: What each side must hold and who is named on the policy.

Who owns the work you produce

Intellectual property is the clause parties often skip, yet it can be the most valuable thing in the contract. If a subcontractor creates designs, drawings, software, or other copyright material for the job, the agreement must say who owns it. Under the Copyright Act 1968 (Cth), an independent contractor generally owns the copyright in work it creates unless the contract says otherwise, which is the opposite of the employee rule. That means the agreement is the place where ownership is decided, and silence favours the subcontractor creating the work.

The trap runs both ways. If you are the subcontractor, a broad assignment of all IP to the principal can hand over material you reuse across other jobs, such as standard drawings or your underlying know-how. The common structure is to assign the specific deliverables to the principal but licence back your pre-existing material so you can keep trading with it. If you are the principal, make sure the contract actually gives you the IP you need to use, maintain, and repair the works, rather than an unhelpful licence.

What counts as confidential and what happens on a leak

A confidentiality clause defines what information is confidential, how it must be protected, and what happens if it is disclosed. For a subcontractor this can protect the principal's trade secrets, pricing, and project details, but it should also protect your own methods and materials.

The useful drafting choice here is controlling how long the obligations last. Some confidentiality clauses run forever, others only for the term of the contract. A clause that survives termination by a reasonable period usually gives enough protection without tying you up indefinitely. Include practical limits as well: what can be disclosed to your own subcontractors and insurers, and what is required to be shared because of a legal obligation.

How the arrangement can end

The termination clause sets out when the agreement can be brought to an end, whether for cause or without cause, and the consequences. This is the clause that most often fails because the parties never expect to use it, and then discover it is silent at the moment they need it.

It should cover the grounds for termination, such as a material breach that is not remedied within a set period, and what happens to money owed at that point. If the contract is ended, who pays for work already completed, and how is it valued? What happens to confidential material and to IP created so far? A clean termination clause answers these in advance rather than leaving them for a dispute.

A related point that belongs in any subcontractor agreement is a clause confirming the relationship is one of independent contractor, not employment. The question of whether a worker is an employee or a contractor is decided by the whole of the relationship, as the High Court confirmed in CFMMEU v Personnel Contracting [2022] HCA 1, and the terms of the contract are central to that analysis. A clause stating the subcontractor is not an employee, has control over how the work is done, and can delegate, is not decisive on its own but it forms part of the picture that a court or regulator will weigh.

Clauses worth adding for this type of contract

Depending on the job, a subcontractor agreement will sometimes need extra clauses that are not part of every version. Consider whether these fit your situation:

Dispute resolution and adjudication: A stepped process of discussion, then mediation, then adjudication or the courts, which can keep a disagreement off the legal track.
GST and withholding obligations: Confirming who prices the work including GST and who bears the relevant tax treatment.
Work health and safety compliance: Allocating duties and confirming inductions and site rules for construction work.
Warranties and defects: What the subcontractor warrants and how defects during a liability period are corrected.
Non-solicitation and restraint: Limits on poaching the principal's clients or staff after the job ends, which need to be reasonable to be enforceable.
Survival clauses: Confirming that clauses like indemnities, confidentiality, and IP survive the end of the agreement.

When to have a lawyer review the agreement

A subcontractor agreement is a commercial contract with a statutory overlay, and the value at stake in the scope, payment, and liability clauses can be far larger than the fee on the job. An Artificer Legal practitioner would review the agreement with an eye to the clauses the principal is most likely to have written in their favour: unlimited indemnities, one-sided variation procedures, broad IP assignments, and retention arrangements that exceed what the law requires. We would negotiate the cap on liability, the payment and retention terms, and the order of the clauses so that your exposure is defined before you sign rather than argued about after a dispute.

The drafting you should not do yourself is tailoring a core template to a specific job or a specific risk profile. A lawyer can compare the agreement against the security of payment legislation that applies in your state, check that the unfair terms regime does not render a clause void, and confirm the subcontractor or employee characterisation of the relationship is not undermined by the wording.

The scope of work

For all the complexity, the clause that most often decides who wins in a subcontractor dispute is the scope of work. It is the clause every other term hangs off: the price is a price for the scope, a variation is a change to the scope, and a termination dispute usually starts because one side says the other did not do the scope. A vague scope of work does not just create uncertainty about the job, it makes the rest of the agreement unworkable, because there is no agreed baseline against which payment, variations, and termination can be measured.

Write the scope of work as if a stranger will one day read it to decide a dispute. Attach the plans and specifications, list the exclusions, and tie the price and the schedule to identifiable milestones. An agreement with a precise scope and clear payment, variation, and termination clauses gives each side a working document that prevents disputes before they arise. That is what a subcontractor agreement is really for: not a formality before the work starts, but the set of rules that keeps a working relationship from becoming a legal one.