A contractor finishes a subdivision civil package in March. The work is good, the relationship is good, and everyone moves on. In the following November someone in the office notices that $46,000 of retention has never come back, that no final certificate was ever issued, and that nobody is entirely sure when the defects liability period ended — or whether it ended.
They start chasing. The project engineer has left the council. The file is thin. There is a list of minor items from a walkover eighteen months ago that was never formally closed out. The conversation that follows is not a dispute, exactly — it is worse than a dispute, because there is nothing crisp to argue about. It is simply slow, and it stays slow for another seven months.
Completion is administratively the most neglected phase of a civil contract, and it is the phase that holds your money.
The last five per cent
There is a structural reason completion goes badly for SMEs. By the time a job reaches practical completion the crew has already moved to the next project, the supervisor’s attention has gone with them, and the person who understood the contract is estimating something else. The remaining work is entirely administrative, it is nobody’s day job, and it has no deadline that anyone feels.
Meanwhile the amounts at stake are large relative to the effort. On a $1.2 million contract with 5% retention, half released at practical completion, you are chasing $30,000 through the defects period — on a job whose margin might have been $110,000. Losing three months of that money to inattention, or losing part of it to a defects argument you had no records for, is a meaningful proportion of the profit. Where the loss is damage rather than workmanship, a policy may answer it instead of your margin — see our guide to making an insurance claim on a civil job.
The fix is not more effort. It is a handful of dated obligations, tracked the way you track a notice period during construction.
What practical completion actually means
Practical completion is the point at which the works are practically complete — capable of being used for their intended purpose — as distinct from completely finished with every defect rectified.[1]
That distinction carries the whole topic. A road that is trafficable, drains properly, is line-marked and is signed is practically complete even though a section of kerb has a chip in it and one pit lid sits two millimetres proud. Those are minor defects, they do not prevent the works being used for their stated purpose, and they belong in the defects period — not in an argument about whether the job is finished.
Under AS 4000 the position is expressed as works complete except for minor defects that do not prevent the works being used for their stated purpose, with all required tests carried out and passed, and essential documentation supplied.[1]
The two notices under clause 34.6
AS 4000 requires the contractor to give two notices, and SMEs routinely give one.[1]
| Notice | When | What it says |
|---|---|---|
| 1 · Notice of anticipated practical completion | At least 14 calendar days before the anticipated date | When you expect to satisfy all the requirements for practical completion |
| 2 · Notice of practical completion | When you believe the requirements are met — typically the day it is achieved | That practical completion has been reached, requesting the Superintendent issue a certificate |
| Superintendent’s response | Within 14 calendar days of receiving your notice | Either issue the certificate of practical completion, or give reasons why practical completion has not been achieved |
Where the Superintendent gives reasons, you address the items raised and resubmit the notice of practical completion.[1] That loop can run more than once, which is why getting the first notice right matters commercially — every cycle is a fortnight of liquidated damages exposure and a fortnight of retention held.
The first notice is the one contractors skip, and skipping it is a mistake for a practical reason rather than a legal one. Fourteen days’ warning gives the Superintendent time to arrange the inspection, to line up the asset owner or the council’s works team, and to raise concerns while you still have crew and plant on site. Contractors who demobilise and then announce practical completion discover a punch list they now have to remobilise for.
The three things that must be satisfied
All three have to be met before practical completion can properly be certified.[1]
- The works are complete except for minor defects that do not prevent them being used for their stated purpose.
- All tests required under the contract, or directed by the Superintendent, have been carried out and passed.
- All documents and information required under the contract, and requested by the Superintendent, that are essential for the use, operation and maintenance of the works have been provided.
Points 2 and 3 are where civil jobs actually stall, and both are foreseeable months in advance.
Testing. Compaction results, concrete strengths, CCTV of drainage lines, pressure and disinfection results on water mains, pavement testing, survey conformance. These sit inside the inspection and test plan regime and should have been closing out progressively as work lots were completed. A contractor whose ITPs have been signed and filed as they went reaches practical completion with the test evidence already assembled; one who left the ITP register until the end spends three weeks chasing a laboratory. Our guide to quality management plans and ITPs covers the discipline that prevents this.
Documentation. On civil work this is usually the bigger delay, and the list is long: work-as-executed drawings, survey conformance data, asset data in the format the council or authority requires, test certificates, material conformance records, warranties, operation and maintenance manuals for any installed equipment, and the environmental and traffic close-out records. Asset data in particular has become a genuine hold point — councils and water authorities increasingly require it in a specific schema, and a submission in the wrong format is a rejection.
Find the handover documentation requirement at award, not at completion. It is normally in the specification rather than the general conditions, and it is one of the items worth extracting during contract review — one of the reasons our post-award and mobilisation support starts with reading the award documents rather than the drawings.
What changes the day PC is certified
Practical completion is the single most consequential date in the contract after the date for practical completion itself. Nearly everything commercial pivots on it.
| What changes | Effect |
|---|---|
| Liquidated damages stop | The exposure ends at practical completion. Every day of delay in certification is a day of exposure — which is why late certification is a commercial issue, not an administrative one |
| The defects liability period starts | The clock that eventually releases your remaining security begins here |
| Half the retention is typically released | Subject to the contract — commonly 50% at practical completion, the balance at the end of the defects period |
| Risk in the works usually passes | Care of the works and the associated insurance obligation typically shift to the principal; check your contract before cancelling anything |
| Insurance obligations change | Contract works cover typically reduces or ends; public liability and professional indemnity obligations often continue. See our guide to insurance requirements for government civil tenders |
| The variation window closes | Under AS 4000 the Superintendent may only direct a variation before the date of practical completion, and you are not bound to comply with one after it[2] |
| Time-related costs stop accruing | Any prolongation claim closes at this date |
That variation row is worth pausing on. Once practical completion is certified, “while you’re here, can you just…” requests are no longer variations you can be directed to perform. If you do them, you are doing them by agreement, and you should price and confirm them as a separate arrangement rather than assuming the contract’s valuation machinery applies. The mechanics are in our guide to variations in civil construction contracts.
Punch lists: what can and cannot hold up the certificate
The most common completion dispute in civil work is not about whether the job is finished. It is about whether a list of small items justifies withholding the certificate.
The contractual answer is clear in principle: practical completion contemplates the existence of minor defects. The test is whether those defects prevent the works being used for their stated purpose.[1] A punch list of twenty-three cosmetic items does not, of itself, prevent a road being used as a road.
In practice, superintendents sometimes treat the certificate as leverage to get the list closed out, because they know it holds your retention and ends your liquidated damages exposure. Handling that well is a matter of tone and record rather than confrontation.
- Ask for the list in writing, itemised. A verbal “there’s a few things” cannot be closed out and cannot be disputed. An itemised list can be worked through and ticked off.
- Close out what you can immediately — most punch items on a civil job are an afternoon’s work if the crew has not left. This is the strongest argument for not demobilising before the inspection.
- Separate the genuinely incomplete from the merely defective. Missing line marking is incomplete work. A scuffed guidepost is a minor defect. The first can properly hold up practical completion; the second should not.
- Where items are minor, say so and ask for the certificate with the items noted. “We propose the certificate issue with items 4–19 recorded as minor defects for rectification during the defects liability period” is a normal, professional request.
- Record the date you say you reached practical completion. If certification is later backdated or disputed, your contemporaneous notice is the anchor.
One further note: some amended contracts give the Superintendent an express power to backdate a certificate of practical completion, and its absence in the standard form has been the subject of commentary in the profession.[3] Where the power exists it can work for you — a certificate issued in April but dated to the March date you actually achieved removes a month of liquidated damages.
Separable portions, staged handover and early use
Civil work is frequently handed over in pieces. A subdivision releases stage by stage. A road is opened to traffic in sections. A water main is commissioned and put into service months before the reinstatement is finished. Each of those situations changes the completion analysis, and contractors who treat the job as a single event lose money in predictable ways.
Separable portions. Where the contract defines separable portions, each carries its own date for practical completion, its own liquidated damages rate, its own certificate and its own defects liability period. That is generally favourable to a contractor — it means late completion of stage three does not expose you to liquidated damages on stages one and two, and it releases the retention attributable to completed portions earlier. Two things to check at award: whether the separable portions are actually defined in the contract particulars rather than merely described in the specification, and how the liquidated damages rate is apportioned between them.
Use before practical completion. The situation to watch is a principal taking the benefit of the works without certifying practical completion — a council opening a road to traffic, or a developer allowing house construction on a completed civil stage, while the certificate remains outstanding because of a punch list. The commercial effect is that you carry liquidated damages exposure, insurance obligations, retention and risk in the works on something the principal is already using.
Where that happens, raise it in writing promptly and specifically: the date use commenced, what was taken into use, and your position that practical completion has been achieved for that portion. Do not let it run silently for two months. A principal using the works is a strong practical argument that the works are capable of being used for their stated purpose — which is the test — but only if the use is documented at the time.
Damage after handover. The other side of early use is damage caused by people other than you. Once traffic is running on a pavement or a builder is working on a completed subdivision stage, damage will occur that is not a defect in your work. Photograph the condition at handover — a full walkover record, dated — because in six months the distinction between a construction defect and third-party damage will rest entirely on what you can show the works looked like on the day you left them.
The defects liability period
Most Australian building and construction contracts prescribe a 12-month defects liability period, though the period varies and is set in the contract particulars.[4] It runs from practical completion.
Terminology differs between the standard forms — AS 2124 uses “defects liability period” and AS 4000 uses “defects correction period” — and our guide to AS 4000 vs AS 2124 sets out the differences in how each form handles it. The commercial substance is the same.
Two features of the period are widely misunderstood, and both work against contractors who assume the obvious.
It is a right as well as an obligation. During the period you have the right to return to site to rectify defects or complete unfinished work.[4] That right has real value: rectifying your own defect at your own cost is far cheaper than having a principal engage someone else and charge you their price. If a principal moves straight to engaging another contractor without directing you to rectify, that is worth objecting to promptly.
It is a minimum, not a cap. The period represents the minimum time you remain exposed to the risk and cost of rectifying defects — not the outer limit of your liability.[4] See §09.
Rectification directions — and the restarting clock
Under AS 4000 clause 35 the process runs in a predictable sequence: the principal discovers a defect and raises it with the Superintendent; the Superintendent issues a written direction with sufficient particulars of the defect and a date for completion of the rectification; the contractor complies.[4]
Where the contractor does not rectify, the principal may have another contractor carry out the work and recover the cost from you, with recourse to your security if you do not pay.[4] That is the mechanism by which retention disappears, and it is almost always avoidable — the usual cause is not refusal but inattention, a direction that arrives by email to someone who has moved on.
Now the provision that surprises people.
Where you rectify a defect during the defects liability period, a new defects liability period runs in respect of that rectification work.[4]
So a defect rectified in month eleven of a twelve-month period can carry its own twelve-month period from the date of rectification. Two practical consequences follow. First, your security may be held longer than you assumed — check whether the contract ties final release to the expiry of all defects periods including those on rectified work. Second, late rectification is expensive in a way that is invisible at the time: fixing something in month eleven rather than month two can extend your exposure by most of a year.
The operational answer is to rectify early and to rectify properly. A defect fixed in month two, well, with photographs and a written close-out, is finished. The same defect fixed hastily in month eleven can still be live two years after you left the site.
Liability after the period ends
A widespread belief among SMEs is that the end of the defects liability period ends their liability. It does not.
Contractors remain liable for defects discovered after the period ends, unless those defects were reasonably identifiable during the period.[4] The defects period is a contractual mechanism for managing rectification during a defined window; it is not a general release, and statutory and common law liabilities operate on their own timeframes.
What this means practically for a civil contractor is that the quality record matters after the job is closed. Compaction results, conformance survey, concrete test certificates and the ITP register are the evidence that work was built to specification, and they are the documents you want to be able to find three years later when a pavement fails and someone asks whether the subgrade was ever tested. Keep the project quality records for the period your contract and your insurances contemplate — not for twelve months.
The final claim
At the expiry of the defects liability period the contractor may submit a final claim and request the return of security, following which the Superintendent issues a final certificate.[4] Under AS 4000 the timeframe for final payment is 7 days under clause 37.4, and the final certificate is issued at the end of the defects liability period — usually at least 12 months after practical completion.[5]
The final claim is the last opportunity to raise anything you are owed on the contract, and it should be treated as a genuine reconciliation rather than a formality. What belongs in it:
- Every variation claimed but not assessed, or assessed but not paid in full — with the amounts and the history, not just a total.
- Delay damages for approved extensions of time attributable to compensable causes, if not already paid — see extension of time and delay cost claims.
- Remeasurement adjustments on a schedule-of-rates contract, reconciled against the final measured quantities.
- Provisional sum and prime cost adjustments, with the actual costs substantiated.
- Rise-and-fall adjustments where the contract provides for them.
- Retention and security release, expressly requested with the amounts stated.
- Any amounts withheld or set off during the contract that you dispute — the final claim is the place to put them back on the table.
Diarise the final claim date at practical completion, twelve months ahead, along with a note of who is responsible. This is the single highest-value entry in a completion checklist, because a final claim that goes in late runs into the next section.
The final certificate and what it forecloses
The final certificate is not a receipt. In most standard forms it is a conclusive or near-conclusive statement of the parties’ positions, and once it is issued and any challenge window has passed, claims that could have been raised beforehand are generally gone.
It cuts both ways. A final certificate may limit the principal’s ability to pursue defects that should have been identified and brought to your attention during the defects liability period.[4] That is a real benefit to a contractor — the certificate closes the file in both directions.
The practical rules that follow:
- Read the final certificate the day it arrives and check it against your own reconciliation. Not next month.
- Know your window to dispute it. Standard forms give a limited period to give notice of dissatisfaction with a final certificate, and amended contracts often shorten it. Missing that window is usually terminal.
- Do not treat a disputed amount as a relationship question. Give the notice, then have the conversation. A notice preserves the position; a conversation without one does not.
- Get the final certificate. An open file with no certificate is worse for you than a certificate you disagree with — it leaves your security held and your position undefined indefinitely.
Getting retention and security back
Security in a civil contract is normally either cash retention withheld from progress payments or a bank guarantee, and increasingly a mix — an initial percentage withheld to a cap, released in two tranches.
Retention clauses exist so that the principal holds something ensuring the works are properly completed by practical completion and that defects are rectified during the defects liability period — a guarantee that the work will be completed to the contracted standard.[6] The remaining portion of security is released when the final certificate is issued after the defects liability period expires, subject to any recourse the principal has had to it.[7] Any entitlement to the return of security depends on the terms of the contract.[7]
What actually works to get it back:
- Diarise both release dates at practical completion — the first tranche at PC, the second at the end of the defects period. Put a name against each.
- Ask in writing, with the numbers. “The defects liability period expired on 14 March 2026. We request release of the balance of retention of $28,400 in accordance with clause X.” A request with a clause reference and an amount gets processed; a general enquiry gets filed.
- Close out defects formally. Each rectification should end with a written notification and photographs. An open item on someone’s list is a reason to keep holding your money.
- Track bank guarantee expiry dates. Guarantees often have no expiry and simply sit at the bank costing you fees and consuming facility capacity. Recovering the physical instrument is a separate task from the contractual release.
- Escalate on a schedule, not on frustration. A polite written follow-up at 14 days, then 30, then to the contract manager’s manager, works better than four months of silence followed by a solicitor.
One jurisdictional note worth knowing: in Western Australia, for construction contracts entered into after 1 February 2024, a claimant may make a claim to substitute a performance bond in place of retention money.[7] Retention and trust account regimes differ substantially between states, and the state-by-state position — including Queensland’s project and retention trusts and the NSW retention trust requirements — is set out in our guide to security of payment in Australia.
Can you claim retention under security of payment?
This is a genuinely useful question and the answer has a sharp edge to it.
Retention moneys held by the principal as security can be the subject of a valid payment claim under security of payment legislation. A claim for the return or release of a bank guarantee generally cannot.[8]
The distinction matters commercially. Cash retention is money withheld from amounts otherwise payable to you, and the statutory adjudication route is available to recover it — which is a far faster and cheaper mechanism than a contractual dispute. A bank guarantee is a different kind of instrument, and its return is a contractual question rather than a payment claim.
Two consequences for how you set up a job. First, if you have a choice at tender or contract stage between cash retention and a bank guarantee, the enforcement position is one factor among several — a guarantee preserves your cash flow but removes the statutory recovery route. Second, where retention is being held past its release date, a payment claim including the retention amount is a legitimate and effective step, not an escalation.
Six ways SMEs lose money at completion
| How it happens | What it costs | The fix |
|---|---|---|
| Demobilising before the practical completion inspection | Remobilisation for a punch list that would have been an afternoon’s work | Give the 14-day anticipated-PC notice and hold a small crew until the inspection is done |
| Never giving a written notice of practical completion | Certification drifts; liquidated damages exposure and retention continue | Both notices, in writing, with dates |
| Handover documentation started at the end | Weeks of delay to certification while chasing test certificates and as-builts | Extract the documentation requirement at award; build the pack progressively |
| Rectifying late in the defects period | A fresh defects period on the rectified work, extending your exposure and your security | Rectify early, close out in writing with photographs |
| Final claim not diarised | Unassessed variations and remeasurement adjustments never claimed | Diarise at practical completion, twelve months out, with an owner |
| Retention never chased | Cash sitting with a principal for years; sometimes written off entirely | Two diary entries and a written request with a clause reference and an amount |
All six are administrative. None requires a lawyer, an argument or a difficult conversation. They require a person, a calendar and about two hours across a year.
A completion checklist
Six weeks before you expect to finish
- Re-read the specification’s handover and asset data requirements. Confirm the format the authority expects.
- Audit the ITP register — every lot signed, every test result on file, every nonconformance closed.
- Order work-as-executed survey and start assembling the drawing set.
- List anything outstanding that could be characterised as incomplete rather than defective, and program it.
Fourteen days out
- Issue the notice of anticipated practical completion.
- Propose an inspection date and ask who needs to attend from the asset owner’s side.
- Submit the handover documentation pack — do not wait for the inspection.
At practical completion
- Issue the notice of practical completion requesting the certificate. Diarise the Superintendent’s 14-day response date.
- Obtain the punch list in writing and itemised; close out what you can while the crew is still there.
- On certification, diarise: end of defects liability period, final claim date, first and second retention release dates.
- Review insurances against the new position — do not cancel anything until you have checked what the contract requires post-PC.
- Reconcile the contract: what has been claimed, assessed and paid, and what remains outstanding.
Through the defects period
- Nominate one person to receive and action rectification directions. Make sure the principal has their details.
- Rectify early. Close out each item in writing with photographs and a date.
- Keep the quality records — they outlive the defects period.
At the end
- Submit the final claim with the full reconciliation, and expressly request release of security.
- Read the final certificate on arrival; check it against your reconciliation; note the dispute window.
- Recover the physical bank guarantee, not just the contractual release.
- Close the job file — and request a debrief while the project is fresh, which is a free source of intelligence for the next bid. See our guide to requesting and using a tender debrief.
The records that make all of this work — the diaries, notices, registers and the discipline of writing things down as they happen — are covered in our guide to contract administration for civil SMEs.
References
This guide is general information for Australian civil construction businesses and is not legal advice. Completion, defects and security provisions are routinely amended by special conditions, and retention and trust account requirements differ between states. All examples are illustrative. Always work from the executed contract and obtain advice on any matter of significance.
- Turtons Lawyers — Practical completion under AS 4000. Practical completion described as the point at which a project is practically complete, in the sense of the works being capable of being used, as distinct from completely finished with all defects rectified; the definition requiring works complete except for minor defects that do not prevent the works being used for their stated purpose, all tests required under the contract or directed by the Superintendent carried out and passed, and all documents and other information required under the contract and requested by the Superintendent that are essential for the use, operation and maintenance of the works provided. Clause 34.6 requiring two notices: a notice of anticipated practical completion at least 14 calendar days before the anticipated date specifying when the contractor expects to satisfy the requirements, and a notice of practical completion when the contractor believes the requirements are met, requesting the Superintendent issue a certificate. The Superintendent required within 14 calendar days of receiving the contractor’s notice either to issue a certificate of practical completion or to provide reasons why practical completion has not been achieved, with the contractor then addressing those reasons and resubmitting. ↩ ↩ ↩ ↩ ↩ ↩
- AS 4000-1997, clause 36.1, as described in Turtons Lawyers, How to claim a variation under AS 4000 — the restriction that the Superintendent may only direct a variation before the date of practical completion, and that the contractor is not bound to comply with a direction to perform a variation issued after that date. ↩
- Macpherson Kelley — Should the Superintendent have express power to backdate practical completion?, commentary on the AS 4000 revision process and the treatment of certification dates. ↩
- Turtons Lawyers — What is the defects liability period (DLP)? Most building contracts in Australia prescribing a 12-month defects liability period, with exceptions; the contractor’s right during the period to return to site to rectify defects or complete unfinished work; the period representing merely the minimum amount of time the contractor will remain exposed to the risk and cost of rectifying defects; the AS 4000 clause 35 process by which the principal identifies a defect and notifies the Superintendent, the Superintendent issues a written direction with sufficient particulars of the defect and a completion date for the rectification work, and the contractor complies; the consequence that if the contractor fails to rectify, the principal can have another contractor carry out the rectification works and recover the costs, with recourse to security if payment is not made; the rule that where the contractor rectifies a defect during the defects liability period there will be a new defects liability period in respect of that rectification work; the position at expiry that the contractor may submit a final claim and request return of security, following which the Superintendent issues a final certificate; the effect of a final certificate in potentially limiting claims for defects that should have been identified and brought to the contractor’s attention during the defects liability period; and the position that contractors remain liable for defects discovered after the defects liability period ends unless those defects were reasonably identifiable during the period. ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩ ↩
- AS 4000-1997, clause 37.4 — final payment, as described in Batch Mewing, Disputing a Final Certificate: What you need to know (7-day timeframe for final payment under clause 37.4; final certificate issued at the end of the defects liability period, usually at least 12 months after practical completion of the works). ↩
- Blaze Business & Legal — Retention Money in Construction Contracts and How to Get Retention Money Released (retention clauses included to ensure contractors properly complete their works by practical completion and rectify defects during the defects liability period, functioning as a form of guarantee that the work will be completed to the contracted standard). ↩
- Holding Redlich — Recovering security in construction contracts: Learnings from Western Australia; K&L Gates — WA Regulation of Performance Security in Contracts; Construction Legal — How to secure the return of your final retention. Release of the remaining portion of security on issue of the final certificate after expiry of the defects liability period, subject to recourse having been had to it; the position that any entitlement to the return of security depends on the terms of the relevant construction contract; and the Western Australian position that for construction contracts entered into after 1 February 2024 a claimant may make a claim to substitute a performance bond in place of retention money. ↩ ↩ ↩
- Cornwalls — Can Security and Retention Funds be Claimed under the SOP Act? (a claim for the return or release of a bank guarantee could not be a claim made under security of payment legislation, whereas retention moneys held by the principal as security can be claimed as a valid payment claim within the scope of the legislation). ↩