Guide · Contracts & compliance
When you need a written
building contract.
A written contract is not paperwork for its own sake. It is what fixes the price, the scope, the dates and the way variations get handled before the disagreement happens. This guide covers when one is required, what it should contain, and why the detail protects the builder too.
01 / The basics
In plain English
Whether a written residential building contract is legally mandatory depends on where you build and the value of the work. The rules differ by state and territory: Tasmania, for example, mandates a written contract above $20,000 and caps deposits by statute, while the ACT does not require one but strongly recommends it. This guide describes common Australian conventions. It is general information, not legal advice, so confirm the requirements for your jurisdiction before you rely on them.
The practical point is simpler than the legal one. Even where a written contract is not required, building without one leaves the price, the scope and the variation process open to memory and goodwill, and those run out fast when a job gets hard. A clear contract is the record everyone falls back on.
What a residential building contract should contain
- The exact names of the owner and the builder, the work address, the date and both signatures.
- The builder's licence details and the relevant insurance policies (see home warranty insurance).
- A detailed description of the work, with plans and specifications, and who is responsible for obtaining approvals.
- The contract price, or a clear explanation of how any unknown costs are calculated.
- Start and completion dates, or the method for setting them.
- A variation clause, a progress payment schedule, and a practical completion and defects liability description.
- A dispute resolution process, a termination clause, and any special conditions.
02 / The reality
Where builders get stuck
No written scope
Without plans and specifications attached, "the job" means whatever each party remembers. Every assumption becomes an argument once money is involved.
Verbal variations
A change agreed on site and never put in writing is the most common source of payment disputes. Most contracts require variations to be written and signed by both parties for exactly this reason.
Unclear price mechanism
If unknown costs are not explained in the contract, the owner sees a moving number and the builder wears the argument. Say how costs are calculated, not just the headline figure.
Deposit and progress terms that breach the rules
Deposits and progress payments are commonly capped or staged by statute, and the caps differ by jurisdiction. Getting them wrong is a compliance problem, not just a commercial one.
Missing licence and insurance detail
Leaving out licence numbers and the required insurance policies weakens the contract and can breach disclosure obligations before a brick is laid.
No dispute or termination path
When a job goes wrong without an agreed process, both parties are left improvising under pressure. The clauses nobody expects to use are the ones that matter most when they are needed.
03 / The fix
A workflow that holds up
- 01
Confirm your jurisdiction’s rules
Check whether a written contract is mandatory at your contract value, and what deposit and progress-payment caps apply in your state or territory.
- 02
Attach the scope
Include plans and specifications, and state clearly who obtains which approvals. The scope is the contract.
- 03
Set the price mechanism
State the price, or explain exactly how unknown costs are calculated, so a moving number is never a surprise.
- 04
Stage the payments correctly
Build a progress payment schedule that fits the statutory caps and the build stages, not just round numbers.
- 05
Fix the variation process
Require variations in writing, signed by both parties, before the work is done. Make it the default, not the exception.
- 06
Include the clauses you hope not to use
Practical completion, defects liability, dispute resolution and termination. Get independent legal advice on any clause you are unsure about.
04 / The tooling
How software helps
A contract sets the rules; the build is where they get kept or broken. The two most common failure points, unpriced variations and a price the owner cannot follow, are both really record-keeping problems. When the variation process lives in email and memory, the signed contract clause requiring written variations is quietly ignored, and the disagreement arrives at claim time.
Software helps by making the disciplined path the easy one: capturing each variation against the job, pricing it, and carrying it into the progress claim so what was agreed and what is billed are the same thing. When the record is kept as the work happens, the contract is enforced by the workflow rather than by argument after the fact. That is the same idea behind avoiding the Reconstruction Tax: keep the understanding of the job in one place so nobody has to rebuild it later.
05 / In practice
Where VIABUILD fits
VIABUILD keeps the contract and the build in step.
VIABUILD captures variations against the job, prices them, and carries them into progress claims, so the work that was agreed and the work that is billed line up. Client selections and approvals are tracked against allowances rather than remembered, and the whole job's record stays in one connected system.
It does not replace your contract or your solicitor. It makes the parts of the contract that live or die on record-keeping, variations, progress payments and completion, easy to keep honest as the build moves.
- Variations captured, priced and signed against the job
- Progress claims that match the agreed contract
- Selections and approvals tracked against allowances
- One record of the job, not scattered email threads
- Accounting kept in Xero, synced, not duplicated
06 / FAQ
Common questions.
It depends on your state or territory and the value of the work. Some jurisdictions mandate a written contract above a threshold (Tasmania, for example, above $20,000), while others strongly recommend but do not require one (such as the ACT). This is general information, not legal advice. Confirm the current rules for your jurisdiction, and get legal advice on anything you are unsure about.
Commonly: the parties’ exact names, the work address, the date and both signatures; the builder’s licence and insurance details; a detailed work description with plans and specifications; who obtains approvals; the price or how unknown costs are calculated; start and completion dates; a variation clause; a progress payment schedule; a practical completion and defects liability description; and a dispute resolution and termination process. Specifics vary by jurisdiction.
Because verbal variations are the most common source of payment disputes. Most contracts require variations to be written and signed by both parties, so both sides agree on the change and its cost before it is built. A variation kept only in memory is work that is hard to get paid for and easy to argue about.
Commonly, yes, and the caps and staging differ by state and territory. Statutory warranties also commonly run for six years from practical completion. Because the thresholds vary, confirm your jurisdiction before setting deposit and progress-payment terms, so the schedule in your contract is compliant.
07 / Keep reading
Related guides & features
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