Practical Completion, Handover and Defects Liability

Practical completion is the single most consequential date in a construction contract. It is the moment the builder stops being liable for delay damages, half the security usually comes back, the defects liability period starts running, risk and insurance shift to you, and in most states a statutory warranty clock begins that will outlast your interest in the project. Get the date wrong by three weeks and you have lost the delay claim. Get the documentation wrong and you have lost the argument about what was outstanding.

The certificate your superintendent issues is generally only evidence of an opinion, and whether practical completion was actually reached on the stated date is a question about your contract, your drawings and your specification, decided on your facts. The consequences land on you rather than on the certifier. If the date is certified early, you take over a building with unresolved work and no liquidated damages entitlement for the overrun. If the date is certified late without proper grounds, you may be exposed to a contractor’s claim for delay costs and for wrongful withholding of security. Where the work is residential, the statutory warranty period that a future owners corporation will rely on starts at a date set by statute, not by your contract, and that mismatch is where a surprising number of claims begin. The definition of practical completion and the machinery around the certificate are drafting questions rather than administration questions, so they are settled while the contract is being negotiated. The questions worth putting to your construction lawyer are set out near the end.

Every figure, period and section number below was current at the date of writing. Statutory warranty periods, bond schemes and security of payment rules have all changed in the past two years, and Victoria’s developer bond regime is still phasing in. Each linked primary source is where to confirm the position that applies to your project.

What does practical completion actually mean?

Practical completion generally means the works are finished except for minor items that do not stop the building being used for its intended purpose. It is not the same thing as completion, and the gap between the two is deliberate.

Two Australian statutes define it in almost identical words, which is useful because they give you a benchmark independent of whatever your contract says. Section 3B(2) of the Home Building Act 1989 (NSW) provides that completion occurs “on practical completion of the work, which is when the work is completed except for any omissions or defects that do not prevent the work from being reasonably capable of being used for its intended purpose”. Section 11(2) of the Home Building Contracts Act 1991 (WA) defines practical completion as “brought to the stage where the home building work is completed except for any omissions or defects which do not prevent the home building work from being reasonably capable of being used for its intended purpose”.

Most standard-form commercial contracts add three further limbs to that core test, and they are the ones that tend to be argued about:

• Compliance with statutory and contractual requirements. The works have to comply with the contract and with the law, which on a building project usually means the relevant approvals and the certificate that authorises occupation are in hand, or at least that nothing in the builder’s control is preventing them.
• Completion of nominated tests and commissioning. Fire systems, mechanical services, lifts and hydraulics are typically required to have been tested and commissioned, with results handed over.
• Delivery of the documentation set. Warranties, as-built drawings, operating and maintenance manuals, and the certificates from the various practitioners are usually preconditions, not afterthoughts.

The practical implication for a developer is that practical completion is a defined state, not a feeling about how finished the building looks. If your contract lists the preconditions, the builder generally has to satisfy them, and a building that looks finished but has no commissioning data and no as-built drawings may not have reached practical completion at all.

Why “practically” complete rather than complete?

The concept exists because construction never finishes cleanly, and a contract that required absolute completion before handover would leave a functionally finished building sitting empty while a joiner adjusts a cupboard door. That would be economically absurd for both parties. So the contract creates an intermediate state: good enough to use, with a mechanism to deal with what is left.

What remains is dealt with in two ways. Minor omissions and defects that were identified at practical completion go on a list, often called a defects list or a punch list, and generally have to be completed within a period set by the contract. Defects that appear later, during the defects liability period, are notified as they emerge. The distinction matters because the first category is unfinished work and the second is failed work, and contracts sometimes treat them differently.

Who decides that practical completion has been reached?

On most commercial contracts the superintendent or contract administrator decides, and the decision is generally required to be made impartially rather than in the principal’s interest. That distinction is worth understanding before you appoint anyone.

The usual sequence runs like this. The contractor gives notice that it expects to reach practical completion on a stated date. The certifier inspects, typically with the consultant team, and then either issues a certificate of practical completion stating the date, or gives written reasons why practical completion has not been reached. If the certifier does neither within the contractual window, many forms deem practical completion to have occurred on the date the contractor nominated, which is a trap worth knowing about: administrative silence can hand the builder the date.

A certificate is generally evidence of the certifier’s opinion rather than proof of the underlying fact. A court or tribunal can find that practical completion was reached on a different date from the one certified. That cuts both ways for a developer. It means a certificate issued too early does not necessarily waive your rights, and it also means a certificate you are relying on to justify withholding liquidated damages could be revisited.

Standards Australia’s general conditions are the most common framework for this in Australia. Standards Australia published a revised edition of AS 4000 General Conditions of Contract on 30 June 2025, its first substantial revision in almost three decades, and states that the updated definitions include that the completion date may precede the certificate issuance. That change is practical rather than cosmetic, and the standard forms are compared in the guide to AS 4000 and Australian standard construction contracts. If certification lags the actual state of the works, the date that matters for liquidated damages, risk transfer and the defects liability period can sit earlier than the paperwork.

One structural point is worth flagging for anyone who has worked in New Zealand. New Zealand has split the role, so the person acting for the principal and the person making impartial determinations are now two different appointments under the 2023 edition of the New Zealand standard conditions. Australia has generally kept the combined role, which is why the identity and independence of your superintendent tends to matter more here.

What actually happens on the date of practical completion?

Seven things generally move at once, and each of them has a cash consequence. Reading them as a single list is the fastest way to see why the date is worth arguing about.

Liquidated damages stop. The contractor’s liability for liquidated damages generally runs from the date for practical completion, which is the contractual deadline, to the date of practical completion, which is when it was actually achieved. Certify practical completion a fortnight early and you have generally given away a fortnight of damages.

Risk and insurance shift. Care of the works usually passes from the contractor to the principal at practical completion, which means your own insurance needs to be in place from that date rather than from settlement or from the occupation certificate. A gap here is one of the more expensive administrative failures available on a project, because the builder’s contract works policy may have ended while your material damage and public liability cover has not started.

Security reduces. On most Australian contracts, performance security is set at around 5 per cent of the contract sum, with roughly half released on the issue of the certificate of practical completion and the balance held through the defects liability period. Where the security is cash retention, that release is a real transfer of money back to the builder.

The defects liability period starts. The clock on the builder’s obligation to return and rectify begins, and the length of it is set by the contract.

The final payment machinery engages. The contractor’s entitlement to claim the balance of the contract sum generally crystallises, and the final claim and final certificate process starts. Security of payment legislation interacts with this, and the timing differs by state, which is covered below.

Practical possession passes. You get the keys, the building, the maintenance obligation and the operating costs. Cleaning, security, utilities, lifts, fire monitoring and common area power become yours. On a commercial building this can run to a meaningful weekly figure that developers sometimes leave out of the feasibility, and it sits alongside the other land holding costs that run until settlement.

In residential work, a statutory clock may start. This is the one most likely to be missed, and it is dealt with in its own section below, because in several states the statutory date is not the date on your certificate.

How long does the defects liability period run?

The defects liability period is set by the contract, and the figure most Australian commercial contracts carry is 12 months from practical completion. Periods of 6 months and 24 months are both used, and it is common to see a longer period applied to specific elements such as waterproofing, facade systems or landscaping while the balance of the works sits at 12 months.

What the period actually gives you is a contractual right to require the builder to come back and rectify, plus a mechanism to have the work done by someone else at the builder’s cost if it does not. That is materially more valuable than a general right to sue for defective work, because it produces rectification rather than litigation, and because the money to fund it is often already sitting in your hands as retained security.

Three features of the period are worth understanding before you negotiate it.

It is generally not a limit on the builder’s liability. A defects liability period that has expired does not usually end the builder’s liability for defective work. It ends the specific contractual mechanism for calling the builder back. Liability for breach of contract continues until the relevant limitation period expires, which is a much longer horizon. Some contracts are drafted to make the defects liability period exclusive, and that drafting is worth finding before you sign rather than after a facade fails.

Rectified work may attract a fresh period. Many contracts restart the defects liability period on any individual item that has been rectified, so a window replaced in month eleven may carry its own twelve months from the date of rectification. Whether your contract does this is a drafting question with a direct effect on how long you hold security.

The final certificate is the real endpoint. On most forms, the end of the defects liability period is followed by a final certificate or final payment process, and it is that document rather than the calendar that releases the remaining security. A defects liability period that ends on paper but never produces a final certificate leaves security outstanding and the account open.

In Queensland, the regulator’s guidance indicates that a contractual defects liability period is close to standard practice on residential work. The Queensland Building and Construction Commission states that if your contract is for a new build or major renovation “you should have a defects liability period of 6 or 12 months in your contract”, and that where a non-structural defect appears in that period you must first notify the contractor and try to resolve it with them.

Which clock is which: defects liability, statutory warranty and limitation period

Three separate clocks start at or around practical completion, they run for different lengths, they are enforced by different mechanisms, and confusing them is the most common analytical error on this topic. Setting them out plainly:

The differences that matter commercially are these. The defects liability period is the only one of the three that reliably produces a builder back on site rather than a legal claim. The statutory warranty period is the one a future owners corporation will use against you, and it generally survives the sale of the property. The limitation period is the one that decides whether anybody can bring an action at all, and on a residential apartment building it is typically the longest-dated liability your project carries.

A developer’s exposure sits mostly in the second and third rows. You may have handed the building over, released the builder’s security, closed the facility and distributed the profit, and still be within a statutory warranty period that an owners corporation can run against you. That is the risk the various bond schemes described below are designed to address.

When does the statutory warranty clock really start?

In New South Wales, for a new residential building in a strata scheme, the statutory clock generally starts on the date of the occupation certificate rather than on the date of practical completion. That single distinction is the most commercially useful thing on this page, and it is routinely missed.

Section 3C of the Home Building Act 1989 (NSW) applies to “residential building work comprising the construction of a new building in a strata scheme … where the issue of an occupation certificate is required to authorise commencement of the use or occupation of the building”, and provides that completion occurs on “the date of issue of an occupation certificate that authorises the occupation and use of the whole of the building”. So on a typical apartment project, the contract’s practical completion date and the statutory completion date are two different dates, and the statutory one is generally later.

Where section 3C does not apply, section 3B does, and it works differently again. Section 3B(1) starts from the contract: completion occurs “on the date that the work is complete within the meaning of the contract”. Only where the contract is silent, or there is no contract, does the statutory practical completion test in section 3B(2) apply. Section 3B(3) then adds a presumption that, unless an earlier date can be established, practical completion occurred on the earliest of whichever of these dates can be established: the date the contractor handed over possession, the date the contractor last attended the site to carry out work other than remedying a defect that does not affect practical completion, the date an occupation certificate was issued authorising use or occupation, or, for owner-builder work, 18 months after the owner-builder permit issued.

Two consequences follow for a developer, and both are worth putting to your lawyer.

The first is that the date you put on your certificate of practical completion may not be the date that governs your longest-dated liability. On a strata apartment building in New South Wales, an owners corporation’s warranty period runs from the occupation certificate, so a long gap between practical completion and the occupation certificate extends your tail rather than shortening it.

The second is that section 3B(4) allows staged practical completion where the work comprises two or more buildings each reasonably capable of being used and occupied separately, so practical completion of one building does not require practical completion of all of them. On a multi-stage or multi-building site that can matter a great deal to when clocks start, and section 3C(3) takes a similar approach for separate buildings in a strata scheme.

What should the handover documentation set contain?

The documentation set is what converts a physical handover into a defensible one, and on most contracts it is a precondition to practical completion rather than a courtesy. Assembling it late is one of the more common causes of a certificate being delayed.

The set typically includes:

• The certificate that authorises occupation, whether that is an occupation certificate, an occupancy permit, a certificate of occupancy or a code compliance certificate depending on the jurisdiction.
• Compliance certificates from the practitioners, covering structural, fire, mechanical, hydraulic, electrical and, where relevant, waterproofing and facade work.
• Commissioning and test results for every system that was required to be tested, with the data rather than just a sign-off.
• As-built drawings and specifications, reflecting what was actually built rather than what was drawn.
• Operating and maintenance manuals, plus the maintenance schedule that the building’s essential safety measures or essential services regime requires.
• Manufacturer and subcontractor warranties, assigned to you or to the owners corporation where the contract requires assignment. Unassigned warranties are a recurring source of loss, because a 15-year membrane warranty that sits with a builder who has since been deregistered is worth very little.
• The defects list agreed at practical completion, with dates for completion of each item.
• Keys, access credentials, security codes and the building management system handover.

The reason to treat this list as commercial rather than administrative is that each missing item is either a delay to your certificate or a liability you have quietly absorbed. A developer selling apartments hands this set, or much of it, to an owners corporation that will read it carefully with a consultant, often around the fifteen-month mark when the first statutory inspection falls due.

What does a late practical completion do to your margin?

Late practical completion costs you interest on peak debt, extended holding costs and, on a presale project, delayed settlements, and it tends to cost more than developers assume because the delay compounds through the occupation certificate.

Take an illustrative project. Assume a build contract of $18,000,000, peak debt of $21,000,000 and an all-in funding cost of 9.0 per cent per annum. Interest at that level runs at roughly $21,000,000 × 9.0 per cent ÷ 52, or about $36,300 per week.

Now assume practical completion is certified six weeks later than the date for practical completion, and the occupation certificate follows five weeks after that because outstanding fire certification has to be resolved. Nothing settles until the occupation certificate issues, so the exposure is eleven weeks, not six. Eleven weeks at about $36,300 is roughly $400,000 of additional interest.

Set that against a project with a gross realisation of $32,000,000 and a total development cost of $27,200,000. Profit is $4,800,000, and the development margin on cost is $4,800,000 ÷ $27,200,000, or about 17.6 per cent.

Add the $400,000 of delay interest and nothing else changes. Total development cost becomes $27,600,000, profit becomes $4,400,000, and the margin on cost falls to $4,400,000 ÷ $27,600,000, or about 15.9 per cent. Gross realisation still reconciles in both cases at $32,000,000. A little under two percentage points of margin has gone, and none of it was a cost overrun on the build.

Two offsets are worth modelling on the other side of the ledger. Performance security at 5 per cent of an $18,000,000 contract is $900,000, and if roughly half is released on the certificate of practical completion, $450,000 leaves your control at that point. Where the remaining $450,000 is cash retention rather than a bank guarantee, holding it through a 12-month defects liability period may avoid drawing that amount, which at 9 per cent is worth in the order of $40,500 of interest. And a defects management allowance of, say, 0.25 per cent of the contract sum is $45,000, which covers your own consultant time and the owner-side rectification you end up funding when a builder disputes an item and you decide the argument is not worth the programme.

Liquidated damages recoverable for the six-week contractual overrun would be a separate calculation driven by the rate in your contract, and a recovery there could offset part of the interest. Whether that rate genuinely reflects your holding costs is a question worth testing before signing, and it belongs in your development cashflow model rather than in a spreadsheet cell at the end of the job.

How do the rules vary by state and territory?

The contractual position on practical completion is broadly consistent across Australia, because most projects use the same standard forms. What varies, and varies a lot, is the statutory overlay: how long the warranties run, when they start, and whether a developer has to lodge a bond against defects. The summary below is a starting point rather than a substitute for advice on your project.

New South Wales

New South Wales has the most developed statutory framework, and it bites hardest on apartment developers.

Section 18E(1)(b) of the Home Building Act 1989 (NSW) sets the warranty period at “6 years for a breach that results in a major defect in residential building work or 2 years in any other case”, running from completion of the work. Section 18E(4) defines a major element as including “an internal or external load-bearing component of a building that is essential to the stability of the building”, a fire safety system, and waterproofing. Building Commission NSW sets out how it deals with building defect complaints.

Two features are easy to miss. Section 18E(1)(e) gives an extra six months where a breach becomes apparent in the last six months of the warranty period. And section 18E(1A) provides that where a building bond has been lodged under Part 11 of the Strata Schemes Management Act 2015, the two-year period is extended until 90 days after the end of the period within which the final inspection report is required. For a developer, that means the short-tail warranty on a bonded building is materially longer than two years.

The bond regime itself is the Strata Building Bond and Inspections Scheme. Building Commission NSW states the bond “is 2% of the contract price (or the prescribed percentage in the regulation)”, that developers lodge it with the Secretary before the occupation certificate is issued, and that the scheme does not apply where the Home Building Compensation Fund does. An increase from 2 per cent to 3 per cent has been deferred until 1 July 2028.

The inspection timetable is what a developer should be programming against, because it sets the date your building gets examined by someone acting for the owners:

• Within 12 months of the building work being finished, the developer must appoint a building inspector.
• Between 15 and 18 months after the work is finished, the inspector completes an interim inspection and report.
• Between 21 and 24 months after the work is finished, the inspector completes a final inspection and report.
• The bond payment process should be completed between 2 and 3 years after the work was finished, with any balance returned to the developer.

Two practical points follow. First, your defects liability period at 12 months generally expires before the interim inspection at 15 to 18 months, so the builder’s security may be gone by the time an independent inspector writes the report you will be judged on. Aligning the two, or holding a longer period on the elements most likely to be reported, is a negotiation worth having. Second, on the payment side, the New South Wales Government states that only work completed in the past 12 months can be claimed, which puts an outer edge on how long a final claim can sit unresolved.

Residential work in New South Wales also carries insurance obligations, which are dealt with separately in the guide to home warranty insurance in NSW.

Victoria

Victoria’s position is changing, and the change is aimed squarely at apartment developers.

The long-standing outer limit is section 134 of the Building Act 1993 (Vic), which bars a building action brought more than 10 years after the issue of the occupancy permit for the building work, or where no occupancy permit issued, after the issue of the certificate of final inspection. A 2024 amendment inserted a provision allowing that period to be extended by a court in accordance with section 77 of the Victorian Civil and Administrative Tribunal Act, so the 10 years is no longer as hard an edge as it once was. Because the clock runs from the occupancy permit rather than from practical completion, the same gap that matters in New South Wales matters here.

On top of that sits the new developer bond scheme in the Building Legislation Amendment (Buyer Protections) Act 2025. The Victorian Government states that the new bond system for apartments sets the bond at 2 per cent of the cost of constructing the building and applies to residential apartment buildings of four storeys and above, with the bond held until a building assessor has carried out a preliminary post-completion inspection within 15 to 18 months after the occupancy permit is issued and, where defects were identified, a final inspection within 21 to 24 months. On commencement, the Government has indicated that regulations supporting the scheme were to be made by 1 July 2026 and that a bond will need to be lodged for projects with a building permit issued from 1 July 2027. Anyone with a Victorian apartment project in the pipeline should confirm the current commencement position, because a transition period applies and the detail has moved more than once.

At the other end of the project, the Building and Plumbing Commission sets out what happens at the end of your building project, including the occupancy permit that confirms the building surveyor is satisfied the building is suitable for occupation.

Victoria’s security of payment timing is also relevant to the final account. The Building and Plumbing Commission states that the latest time a payment claim can be served is the later of the time specified in the contract, or 6 months after practical completion of all construction work, or 6 months after the supply of all related goods and services. That was extended from three months, which means a builder’s final claim can now surface later than many developers expect.

Queensland

Queensland runs its defect framework through the regulator rather than primarily through the courts, and the timeframes are precise.

The Queensland Building and Construction Commission states that for a non-structural defect a complaint “must be lodged to us as soon as possible and no later than 12 months from completion of work”, and that where the contract has a defects liability period the owner should first notify the contractor and try to resolve the issue. For a structural defect, a complaint must be lodged “as soon as possible and within 12 months of noticing the defect”, and the regulator states it has “6 years and 6 months from when the building work was completed to issue the contractor with a direction to rectify”.

The separate question of home warranty insurance carries shorter windows again. The regulator states that to qualify for a claim on a defect appearing in the first six months from completion, the complaint must have been lodged within 7 months of completion. Insurance timeframes and complaint timeframes are not the same thing, and treating them as one is a common error.

Western Australia

Western Australia is the jurisdiction with the shortest statutory notification window, and the shortness of it is worth planning around.

Section 11(1) of the Home Building Contracts Act 1991 (WA) provides that “it is a term of every contract that the builder is liable to make good at the cost of the builder defects in the home building work notified in writing to the builder within the period of 4 months commencing on the day of practical completion”. Section 11(1a) confirms that a contract may provide for a period longer than four months.

Four months is short enough that a defect appearing in the first winter after a summer handover may fall outside it, and the statutory answer is that the contract can extend the period. Separately, the Act provides that home indemnity insurance must allow claims to be made “at any time before the expiration of a period of 6 years from the day of practical completion within the meaning of that term in section 11”, so the insurance tail is measured from practical completion rather than from the occupancy permit. Section 25L also requires a developer, before entering into a sale contract, to pass on a notice given under section 25J where settlement is or is likely to occur within 6 years of practical completion of the residential building work.

South Australia

South Australia runs a five-year statutory warranty window with a separate ten-year outer limit, and the shorter one is treated as firm.

The South Australian Government’s guidance on builder responsibilities sets out the statutory warranties that apply to domestic building work under the Building Work Contractors Act 1995 (SA). Proceedings for breach of a statutory warranty are generally required to be commenced within five years after completion of the building work, and that limit is not extendable. A separate ten-year bar applies to actions for economic loss or rectification costs arising from defective building work.

For a developer, the shorter of the two is the one that shapes how long you hold security and how long you keep the project entity open.

Tasmania

Tasmania is unusual in giving practical completion its own statutory notice.

The Residential Building Work Contracts and Dispute Resolution Act 2016 (Tas) provides for a notice of practical completion, being a notice signed by the building contractor stating that the date of practical completion has occurred. The Act also defines “completion day” as the day the work is completed in compliance with the contract, including all plans and specifications and all statutory requirements, and without defects or omissions other than minor ones that will not unreasonably affect occupation.

Statutory warranties generally run for six years and transfer to a new owner if the property is sold within that period, and an application for mediation of a building dispute can generally be made within six years of the date of practical completion. The combination of a statutory practical completion notice and a six-year clock measured from it makes documentation of the date unusually important in Tasmania.

Australian Capital Territory

The Australian Capital Territory splits its warranty periods by element and measures them from a defined completion day.

Under section 88 of the Building Act 2004 (ACT), as described in the ACT Government’s guidance on statutory warranties, the warranty runs for six years after the completion day for residential building work about a structural element of a building, including components of external walls such as weatherproofing, and two years after the completion day for a non-structural element. The completion day is the day the work is completed or the day the contract ends, whichever is later.

Two points are useful for a developer. The warranty is not confined to the original purchaser, so a buyer acquiring within the period takes the remainder of it. And structures you cannot live in, such as pools, driveways and fences, are generally outside the statutory warranty even though they are inside your contract.

Northern Territory

The Northern Territory position centres on its residential building cover regime rather than on a warranty section, and the scope is narrower than elsewhere.

The Northern Territory Government states that owners of new homes must have residential building cover as protection from defective or incomplete work, and that new homes for this purpose “include duplexes, units in complexes up to three storeys in height excluding undercroft or underground parking levels, and extensions or renovations to those buildings”. The requirements sit in the Building Act 1993 (NT), and the current mechanism is the fidelity fund certificate.

The three-storey ceiling is the operative point for a developer. An apartment building above that height falls outside the residential building cover requirement, which shifts more of the defect risk onto the contract and onto whatever security you have retained. The Northern Territory does not publish warranty periods in the same form as the eastern states, so the periods that apply to your project are a question for the Act and for your lawyer rather than something to assume from the position elsewhere.

How does practical completion work in New Zealand?

New Zealand layers a statutory 12-month defect repair obligation on top of implied warranties that run for up to 10 years, and both operate regardless of what the contract says.

The Ministry of Business, Innovation and Employment states that implied warranties under the Building Act 2004 apply to all residential building work “for up to 10 years regardless of whether you have a written contract or what the contract terms are” and regardless of project cost. Separately, and in addition, the Ministry states there is a 12-month defect repair period: “if any defects in the building work emerge within 12 months of the completed build date, your builder has an obligation to fix them”. Section 362Q of the Building Act 2004 deals with the requirement to remedy a defect notified within one year of completion.

The warranties themselves cover, among other things, that the work will be done properly and competently and in accordance with the consented plans, that materials will be suitable and new unless the contract says otherwise, that the work will comply with the Building Act and the Building Code, that it will be carried out with reasonable care and skill, and that the home will be suitable for occupation at the end of the work.

Two differences from Australia are worth holding onto. The first is that the 12-month obligation is statutory rather than contractual, so it does not depend on negotiating a defects liability period, and the onus sits with the builder to show the defect is not their responsibility during that year. The second is the completion certificate itself: New Zealand’s code compliance certificate is a statement that work complies with the building consent, and the practical relationship between it and handover works differently from the Australian occupation certificate pattern.

On the contract side, NZS 3910:2023, published by Standards New Zealand in November 2023, is the principal standard form and the most substantial revision of it in a decade. The 2023 edition separated the previous single engineer role into a contract administrator acting for the principal and an independent certifier making impartial decisions, including on practical completion. For an Australian developer working across the Tasman, that means two appointments to budget for and a genuinely independent decision on the date.

Where do practical completion disputes usually come from?

Most disputes come from one of five places, and all five are addressable in drafting or administration rather than in court.

The definition itself. A definition that requires the works to be “complete” in substance but lists preconditions in a different clause invites argument about whether a missing commissioning report defeats practical completion. The tighter the list of preconditions, the shorter the argument.

Certification silence. Where the contract deems practical completion if the certifier does not respond in time, a certifier on leave can hand the contractor a date. The trap is administrative, not legal.

Approvals outside the builder’s control. If practical completion is conditioned on the occupation certificate or occupancy permit, and the certifier is waiting on a consultant’s certificate or a council matter, the builder can argue it has done everything within its power. Whose risk that is depends entirely on the drafting.

Staged or partial handover. Taking possession of a level, a retail tenancy or a display suite before the rest of the building is finished can be argued as acceptance of practical completion for that part, or for the whole. Separable portions exist in most standard forms precisely to manage this, and using them deliberately is safer than taking early possession informally.

The extension of time trail. A liquidated damages claim depends on there being a fixed date for practical completion to measure lateness against. A poorly administered extension of time regime, or acts of the principal that cause delay without a mechanism to extend the date, can put time at large and take the damages entitlement with it. That is a drafting and administration question, and it is worth resolving before you choose a builder rather than after.

A sixth, less obvious source of trouble is the mismatch between your defects liability period and the statutory inspection timetable. On a New South Wales apartment building, an independent inspector writes an interim report between 15 and 18 months after the work is finished. A 12-month defects liability period has generally expired by then, and half your security with it. The report will still be written.

What to ask your construction lawyer

These are the questions that decide how practical completion runs on your project, and they turn on your contract and your facts rather than on general principle.

• How is practical completion defined in our contract, what are the preconditions, and is the occupation certificate or occupancy permit one of them?
• If the superintendent does not certify or give reasons within the contractual window, does practical completion get deemed, and on whose nominated date?
• Is our defects liability period exclusive, meaning it limits the builder’s liability, or does it sit alongside our general rights for breach of contract?
• Does the defects liability period restart on items that have been rectified, and if so, on the individual item or on the whole of the works?
• On this project, which statutory completion date governs the warranty period, and how far behind practical completion is it likely to sit?
• What is our exposure if we take early possession of part of the building, and should we be using separable portions rather than doing it informally?
• Can the superintendent extend the date for practical completion unilaterally, and what is our exposure to time going at large if we cause a delay?
• What happens to the security release if we dispute the certificate of practical completion, and what is our risk if we withhold it and are later found to be wrong?
• Which warranties from subcontractors and manufacturers are assigned to us or to the owners corporation, and what is the mechanism if the builder’s entity is deregistered before they are called on?
• If this is an apartment building, what bond obligations apply, when must the bond be lodged, and what does the inspection timetable mean for when we can close the project entity?
• What is the last date a final payment claim can be served on this contract under the security of payment legislation in this state?

What to ask your superintendent or contract administrator

• What is your process for determining practical completion, what will you inspect, and who from the consultant team will attend?
• What is on the precondition list as you read the contract, and what do you currently consider outstanding?
• How will the defects list at practical completion be recorded, and what dates will you set for completion of each item?
• Are you satisfied the commissioning and test data is complete, as distinct from signed off?
• What is your view on the date of practical completion if the delay is caused by a certificate we or our consultants are responsible for producing?

What to ask your quantity surveyor

• How much security will be released at the certificate of practical completion on this contract, and how much is held to the final certificate?
• What is your estimate of the cost to complete the items on the defects list, and does the retained security cover it with margin?
• What allowance should we carry for owner-side defect management across the defects liability period, and how does that sit against the contingency?
• How does the timing of practical completion and the occupation certificate flow through the cashflow and the peak debt position?

Key points

Practical completion is a defined state, not a level of finish: the works complete except for omissions or defects that do not prevent the building being reasonably capable of use for its intended purpose, plus whatever preconditions your contract adds. The certificate is generally evidence of the certifier’s opinion rather than proof, and a court can find a different date.

Seven things move on that date: liquidated damages stop, risk and insurance pass to you, roughly half the security is usually released, the defects liability period starts, the final payment machinery engages, possession and operating costs pass, and on residential work a statutory clock may start.

Three clocks run, and they are not the same. The defects liability period is contractual, commonly 12 months, and is the only one that reliably brings the builder back to site. Statutory warranty periods are set by state legislation, commonly 2 to 6 years depending on the state and the defect, and generally pass to later owners. Limitation periods for a building action are often around 10 years and set the outer boundary.

The date that starts the statutory clock is frequently not the date on your certificate. In New South Wales, section 3C of the Home Building Act 1989 puts completion for a new strata building at the occupation certificate date. In Victoria, section 134 of the Building Act 1993 measures the 10-year bar from the occupancy permit. Both mean a long gap between practical completion and the occupation approval extends your tail.

Bond schemes have changed the developer’s position on apartment buildings. New South Wales requires a bond of 2 per cent of the contract price before the occupation certificate, with inspections at 15 to 18 months and 21 to 24 months. Victoria’s scheme is set at 2 per cent for buildings of four storeys and above, on a phased commencement, with a comparable inspection timetable. In both cases the inspection falls after a standard 12-month defects liability period has expired.

Western Australia’s four-month statutory notification window is the shortest in the country and runs from practical completion, though a contract may extend it. Queensland’s structural defect direction power runs 6 years and 6 months from completion of the work. Tasmania uses a statutory notice of practical completion and a six-year warranty. New Zealand adds a statutory 12-month defect repair obligation on top of implied warranties lasting up to 10 years.

Eleven weeks of delay from practical completion through to the occupation certificate on a project with $21,000,000 of peak debt at 9.0 per cent costs roughly $400,000 in interest alone, which on the illustrative numbers above moved margin on cost from about 17.6 per cent to about 15.9 per cent without a single dollar of cost overrun on the build.