A building contract review is the step where you pay an independent professional to read your construction contract before you sign it, and to tell you where the risk actually sits. It is a different exercise from reading the contract yourself, and the two are not interchangeable.
Understanding the document matters, and the BUILTLY guide on how to read a building contract in Australia walks through the clauses that carry the most weight. The companion guide on what a building contract is in Australia covers what the document contains and how the standard industry forms are structured. This guide picks up where those leave off. It is about engaging someone else to review the contract on your behalf, who that person should be, what they will look at and what the exercise costs.
The reason a professional review is worth the money even when you have read the contract carefully is simple. Reading tells you what a clause says. A reviewer who works with these contracts constantly tells you whether the clause is normal, whether it has been amended away from the standard form, and what it does to you in the scenarios that actually cause disputes on Australian residential projects.
What a building contract review is
A contract review is a paid professional engagement with a defined output. You provide the contract, the specification, the plans and any annexures the builder has attached. The reviewer returns written advice, usually as a marked-up copy of the contract or a schedule listing each clause of concern, the risk it creates and the amendment they recommend requesting.
A good review does three things. It identifies clauses that have been altered from the standard industry form so you know what has been added or removed. It flags terms that are unenforceable or non-compliant with your state domestic building legislation, because contracts do get issued with clauses that the relevant Act overrides. And it translates the commercial effect of each clause into plain terms, so you understand what happens to your money and your programme when something goes wrong.
A review is not a guarantee of a smooth build. It does not price the job, assess the builder, or force any change. It reduces the chance you accept obligations you did not understand.
The practical test
If you cannot say, without looking, how many days notice the builder needs to claim an extension of time and what happens if you dispute a progress claim, you do not yet know the contract well enough to sign it. A review is the fastest way to close that gap.
Who reviews a building contract
There are two distinct professional reviews available to an Australian homeowner, and they look at different things. Many people engage one. People building at the higher end, or on a complex site, often engage both.
A solicitor or conveyancer practising in construction law
This is the legal review. A solicitor who works in building and construction law reads the contract against the domestic building legislation in your state, checks the mandatory statutory disclosures and warnings are present, and assesses whether the risk allocation in the amended clauses is reasonable. They are the right person to tell you whether a termination clause is one-sided, whether a liquidated damages rate is enforceable, and whether the dispute resolution pathway funnels you somewhere expensive.
Conveyancers are licensed to a narrower scope and that scope varies by state. If your conveyancer does not review building contracts regularly, ask for a referral rather than accepting a review that sits at the edge of their practice.
A building consultant or quantity surveyor
This is the technical and commercial review. A building consultant or quantity surveyor is not reading the legal clauses in detail. They are reading the specification, the schedule of inclusions, the allowances and the drawings, and checking whether the contract sum plausibly builds the house that has been drawn.
They look for scope gaps, where work shown on the plans is missing from the specification and will therefore arrive later as a variation. They test whether provisional sums and prime cost allowances are set at realistic values or deliberately low to make the headline price competitive. They check that the payment stages align with real construction milestones rather than front-loading the builder. On a custom build this review frequently saves more money than the legal review does.
Using both
The two reviews do not overlap much. A solicitor will not tell you the tiling allowance is half what your selections will cost. A quantity surveyor will not tell you the extension of time clause has no cap. On a project home with a fixed standard contract, a legal review alone is often proportionate. On a custom build with a bespoke or heavily amended contract, running both is the more defensible position, and the combined fee is still a small fraction of one variation you did not see coming.
What a contract review actually checks for
A competent reviewer works through the contract systematically rather than skimming for obvious problems. These are the areas where amendments most often shift risk onto the homeowner.
Payment schedule and progress claim structure
The reviewer checks that each payment stage corresponds to work genuinely completed at that point, and that the cumulative percentage paid never runs meaningfully ahead of the value of work in place. Front-loaded schedules leave you exposed if the builder becomes insolvent mid-build, because you have paid for progress you do not have. They also check the deposit against the cap your state legislation permits, the notice period for disputing a claim, and whether the contract allows you to withhold payment for defective work. The BUILTLY guide on the progress payment schedule in Australia sets out what each stage should represent.
Variation clause fairness
Variations are the single largest source of cost escalation on residential builds. The reviewer checks whether variations must be documented and priced in writing before work proceeds, whether you have a right to reject a variation, what margin the builder may add, and whether the contract allows the builder to claim a variation for something a competent builder should have allowed for. Clauses that let the builder proceed on a verbal instruction and invoice later are a clear flag.
Provisional sums and prime cost items
Every provisional sum and prime cost item in the contract is an allowance, not a price. The reviewer tests whether each allowance is realistic for the standard of finish you have specified, and checks the mechanism for adjusting the contract sum when the actual cost lands. They also check whether the builder can charge margin on the increase, and whether there is any obligation to notify you before an allowance is exceeded. A contract full of understated allowances produces a headline price that was never achievable.
Defects liability period terms
The reviewer confirms the length of the defects liability period, the process for reporting defects, the timeframe within which the builder must attend, and what happens if they do not. They check that the contractual period does not purport to limit your statutory warranty rights, which cannot be excluded by the contract and have their own time limits. Contracts that require defects to be notified in a single list at practical completion, with nothing accepted afterwards, are unreasonable and worth challenging.
Delay and extension of time clauses
This is where a review most often finds an uncapped exposure. The reviewer checks what events entitle the builder to an extension, whether the builder must give notice within a defined period, whether the extension must be substantiated, and whether any delay costs are payable by you. Clauses that grant extensions for inclement weather without defining it, or that allow the builder to claim time for their own resourcing problems, effectively remove the completion date from the contract.
Termination clauses
The reviewer compares the builder rights to terminate against yours. Many amended contracts give the builder broad grounds and a short notice period while giving the owner narrow grounds and a long cure period. They also check what you owe on termination, including whether the builder can claim loss of profit on work never carried out, and whether you retain the right to use the design documentation to complete the build with someone else.
Insurance and warranty obligations
The reviewer confirms the builder holds contract works and public liability insurance, that the policy limits are adequate for the contract sum, and that the certificate of currency is provided before work starts. They check that the statutory home warranty cover required in your state applies to your project and that you receive the evidence of cover before any deposit is paid, since paying a deposit before cover is in place is a common and avoidable exposure. The BUILTLY guide on home warranty insurance in Australia explains the state schemes and their thresholds.
Red flags a review commonly surfaces
- A deposit above the cap permitted in your state
- Payment stages that run ahead of completed work
- Provisional sums set well below realistic cost
- Extension of time entitlements with no notice requirement
- No stated completion date, or a date expressed only as an estimate
- Statutory warranty rights described as replaced by the contract
- Pressure to sign before the review is complete
What a building contract review costs
A solicitor review of a residential building contract commonly costs between 500 and 1,500 dollars. The lower end covers a fixed-fee review of a standard industry form with written advice returned. The upper end applies where the contract has been heavily amended, where the build is complex, or where the engagement includes negotiating amendments with the builder rather than simply reporting on them. Ask for a fixed fee and ask explicitly whether follow-up correspondence with the builder is included, because that is where hourly billing usually starts.
A building consultant or quantity surveyor review typically ranges from 600 to 2,500 dollars, depending on the size of the build and the depth of the scope check. A review that simply sanity-checks allowances sits at the lower end. A full cost plan comparing the contract sum against an independent estimate of the documented works sits at the top. These figures are indicative and vary by state and firm, so obtain quotes rather than budgeting from a published range.
Set that against the commitment. On a 650,000 dollar contract, a 1,000 dollar legal review is roughly fifteen hundredths of one percent of the contract sum. A single unnoticed provisional sum understated by 20,000 dollars costs twenty times the review fee, and an uncapped extension of time clause on a build that runs six months late can cost far more than that in rent, interest and lost time. The review is not an expense measured against your other pre-construction costs. It is measured against the size of the obligation you are about to accept.
When to get a review
Before signing is the obvious answer, and the one that matters most, but timing within that window changes what the review can achieve.
Before you sign, with time to negotiate
Send the contract for review as soon as the builder issues it, not in the week you intend to sign. A review takes three to five business days, and any amendments you request take another one to three weeks to draft, exchange and agree. A review returned the day before signing gives you advice you have no time to act on. Cooling-off rights exist in some states but they are short and they are not a substitute for reviewing in advance.
At tender stage on a custom build
On a custom build, the contract terms and the price are both still open at tender stage. Having a reviewer look at the proposed contract and the tender documentation together, before you have emotionally committed to one builder, gives you real leverage. You can compare how two builders allocate risk as well as how they price the job, and you can ask for amendments while the builder is still competing for the work. Once you have signed a preliminary agreement and paid for design development, that leverage is largely gone. The BUILTLY guide on how to read a building contract is useful preparation for that conversation.
On a project home contract
Volume project builders present their contract as fixed, and in most cases it genuinely is. That leads buyers to conclude a review is pointless. It is not. The review still tells you what the inclusions cover, how site costs will be adjusted once the soil report and contour survey come in, and what your exposure is if the site turns out to be worse than the assumed base. You may sign the contract unchanged, but you will have priced the risk before you did.
If you are acting as owner-builder
Owner-builders sign multiple trade contracts rather than one head contract, and each one carries its own payment, defects and insurance terms. A review of your standard trade agreement, used consistently across every trade, is more efficient than reviewing each contract separately. The BUILTLY guide on owner-builder permit requirements by state covers the obligations that sit alongside those contracts.
A review checks the document, not the business behind it. The two run in parallel, and the reviewer will assume you have already confirmed the licence, insurance and track record of the builder named on the front page. The BUILTLY guide on how to vet a builder in Australia sets out that side of the process step by step.
How to brief your reviewer
The quality of a review depends heavily on what you send. A reviewer given only the contract body will miss the risks that live in the annexures. Provide the complete package.
- The contract including all schedules, annexures and special conditions
- The full specification and schedule of inclusions
- The current architectural and engineering drawings referenced in the contract
- The soil report and contour survey, since site cost adjustments depend on them
- Any quote, tender or preliminary agreement that preceded the contract
- Any email correspondence where the builder has promised something not written into the contract
Tell the reviewer your priorities as well. A fixed completion date matters more to someone paying rent while they build than to someone with no deadline. A tight budget with no contingency changes how aggressively you should push back on provisional sums. Reviewers give better advice when they know which risks you can absorb and which would derail you.
Finally, record the outcome. Keep the marked-up contract, the amendment schedule and the builder written response together with the signed contract. If a dispute arises later, the documented record of what was raised, what was changed and what the builder declined to change is often the most useful evidence you hold. For the wider sequence this sits within, see the BUILTLY complete guide to building a house in Australia.
BUILTLY and the other half of the risk
A contract review protects the paperwork. It tells you what you are agreeing to and where the risk has been allocated. What it cannot tell you is whether the builder signing that contract has actually delivered work of the standard and scale you are asking for.
That is the other half of the picture, and it is answered by evidence rather than by clauses. Confirming the licence is current and correctly classed for your build is the starting point, and the BUILTLY guide on how to check a builder licence in Australia sets out the state-by-state process through QBCC, the Building and Plumbing Commission (BPC), NSW Fair Trading and the other regulators.
BUILTLY is building a record of completed Australian homes that credits the builder, architects, designers and trades behind each one.
Frequently asked questions
Do I really need a building contract review if I have already read the contract myself?
Reading the contract yourself is useful and worth doing, but it is not the same as a professional review. A construction solicitor reads the same document against the state legislation that governs it and against hundreds of other contracts they have seen, so they recognise which clauses have been amended away from the standard form and which amendments cause problems later. A homeowner reading a contract for the first time can understand what each clause says without being able to judge whether it is reasonable.
How much does a building contract review cost in Australia?
A solicitor review of a residential building contract commonly falls between 500 and 1,500 dollars depending on the complexity of the contract, whether the review includes negotiating amendments with the builder and whether the solicitor is reviewing a standard industry form or a heavily amended bespoke document. A building consultant or quantity surveyor review of the scope, specification and allowances typically ranges from 600 to 2,500 dollars. These are indicative ranges and quotes vary by state and by firm.
How long does a contract review take?
Most solicitors turn a residential building contract review around within three to five business days, with written advice provided as a marked-up contract or a schedule of recommended amendments. If the review leads to negotiation with the builder, allow another one to three weeks for amendments to be drafted, exchanged and agreed. Build that time into your programme rather than compressing it into the week you intended to sign.
Can the builder refuse to change clauses my reviewer flags?
Yes. A builder is entitled to decline amendments, and volume project builders in particular often decline any change to their standard contract. That is not automatically a reason to walk away. The value of the review is that you go into signing knowing exactly which risks you have accepted rather than discovering them during a dispute. Where a builder refuses to amend a clause that materially shifts risk onto you, that response is itself useful information about how the relationship will run.
Is a conveyancer enough, or do I need a solicitor?
Conveyancers are licensed for property transfer work and the scope of what they can advise on varies by state. A residential building contract is a construction contract governed by domestic building legislation, not a transfer of land, so most homeowners are better served by a solicitor who practises in building and construction law. If your conveyancer does not regularly review building contracts, ask them for a referral rather than accepting a review outside their usual scope.
Should I get a review for a project home contract as well as a custom build?
Yes. Project home contracts are usually presented as fixed and non-negotiable, which leads many buyers to skip the review entirely. The review still has value because it tells you what the inclusions actually cover, how site costs and provisional allowances are treated and what your exposure is if site conditions differ from the assumed base. You may not change the contract, but you will price the risk correctly before you commit.