A council job, eight weeks in. The superintendent’s representative walks the site on a Tuesday, points at a section of subgrade that has come up wetter than the geotechnical report suggested, and says: “You’ll need to undercut that and bring in rock. Just get it done, we’ll sort the paperwork out.”

You undercut it. You bring in 180 tonnes of rock. It takes three days and it costs $28,000 you had not priced. Six weeks later you put it in a progress claim and the superintendent’s assessment comes back with a single line: no written direction issued — not approved.

Everything about that outcome was decided on the Tuesday. Not at claim time.

Where variation money is actually lost

There is a widespread belief among civil SMEs that variation disputes are arguments about price — that the contractor says $28,000 and the superintendent says $19,000 and the truth is somewhere in between. That does happen. But it is the second-order problem, and it is not where most of the money goes.

Most variation money is lost earlier, on a question that has nothing to do with rates: was this a variation at all, and can you prove it was directed? A claim that fails that question never reaches the valuation argument. It fails on its face, and it fails for reasons that were entirely within your control at the time the work was instructed.

That is good news, in a sense. Rate arguments are genuinely contested — reasonable people disagree about what a fair rate for undercut and import looks like. But the entitlement questions are procedural, and procedure is something a five-person contractor can get right every single time with a system that takes minutes rather than hours. This guide is mostly about that system.

What a variation actually is

A variation is a change to the scope of the work under the contract, directed under the contract’s variation clause, which the contract then requires to be valued and paid.

Under AS 4000, clause 36.1 empowers the Superintendent to direct a variation, and the directions it contemplates are broader than most contractors assume. They include increasing or decreasing the quantity of work, altering the character or quality of the work, changing its dimensions, requiring additional work, and requiring the demolition or removal of material or work no longer required.^[1] A decrease is a variation. A deletion is a variation. Being told to build the same thing to a different specification is a variation.

Two limits sit around that power, and both matter to you.

The character-and-extent limit. A variation must be of a character and extent contemplated by, and capable of being carried out under, the provisions of the contract.^[1] A superintendent cannot use the variation clause to direct work that is fundamentally different in kind from what you were engaged to do. If you tendered a 400-metre road rehabilitation and you are directed to build a bridge, that is not a variation — it is a new contract, and you are not obliged to price it as a change to this one.

The timing limit. Under AS 4000 the Superintendent may only direct a variation before the date of practical completion. A contractor is not bound to comply with a direction to perform a variation issued after that date.^[1] This matters more than it sounds. Late-stage “just fix this while you’re here” requests during the defects period are not variations under the clause, and if you do the work anyway you are relying on goodwill rather than entitlement.

Situation	Variation?	What actually governs it
Superintendent directs an extra 200m² of asphalt	Yes	Variation clause — increase in quantity of work
Quantities in a schedule-of-rates contract come in higher than scheduled	Usually no	Remeasurement. You are paid at the scheduled rate for the actual quantity; the mechanism is the measurement clause, not the variation clause
You hit rock that no reasonable contractor could have anticipated	Not directly	A latent condition — but under AS 4000 the resulting work is deemed a variation and valued as one
Superintendent deletes a work item	Yes	Variation clause — decrease in quantity. Value comes off, but your entitlement to prove associated loss survives
You rebuild work that failed its ITP	No	Rectification of defective work at your cost
A provisional sum item is instructed	Usually no	The provisional sum adjustment mechanism, which values it and adjusts the contract sum without a variation direction
Superintendent directs a change to your construction method for their convenience	Yes	Variation clause — alteration to the character of the work

If any of the mechanisms in that table are unfamiliar, our civil construction tendering glossary defines each of them briefly.

That second row is the one civil contractors most often get wrong in both directions. On a schedule-of-rates contract, quantity movement inside the scheduled items is remeasurement, and it flows through automatically. Claiming it as a variation makes you look like you do not understand your own contract. But there is a limit — where quantities move so far that the rate itself is no longer reasonable, most forms allow the rate to be revisited, and that is a valuation argument worth having. We cover it in §09.

Directed variations and the written-direction rule

Here is the rule that decides the Tuesday scenario at the top of this guide, and it is worth stating as bluntly as the contract does.

Under AS 4000 you must have a written direction before you carry out varied work. If you vary the work without one, you are in breach of the contract.^[2]

Read that carefully, because it cuts in a direction most contractors do not expect. The risk of proceeding on a verbal instruction is not only that you might not get paid. It is that performing unvaried work outside the contract scope is itself a breach — you have departed from the work under the contract without authority. In practice principals rarely pursue that, because they wanted the work done. But it removes any sense that proceeding on a handshake is the generous, commercial thing to do. It is not. It is the unprotected thing to do.

The commercial reality is that site does not run on written directions, and it never will. A superintendent’s representative standing in a trench is not going to walk back to the site office and issue a formal instruction before you move an excavator. So the practical discipline is not “refuse to work without a written direction”. It is:

• Get the instruction in writing before the work if you can — and on most jobs, with most superintendents, you can, if you ask in a way that is easy to say yes to.
• If you cannot, create the written record yourself, immediately, and send it to them. This is the single highest-value habit in contract administration and it is covered in detail below.
• Never let the first written record of a variation be the progress claim. If the claim is the first the superintendent has seen of it in writing, you have handed them the easiest rejection available.

The oral instruction problem, and clause 20

AS 4000 anticipates exactly this problem and gives you a mechanism for it. Under clause 20, where the Superintendent gives a direction orally, the contractor may request written confirmation of it.^[2] That is the contractual hook for the habit described above, and it is why the confirmation email is not an act of aggression — it is the contract’s own procedure being followed.

What that email should look like matters. The version that works is short, neutral, factual, and easy for a busy superintendent to confirm with one word. The version that fails is long, defensive, and reads like the opening move in a dispute.

Element	Why it is there
Who gave the instruction, when, and where	Establishes it came from someone with authority to direct. “Verbal instruction from D. Nguyen on site at ch. 340, Tue 14 July, approx. 9:15am.”
What you were instructed to do, in scope terms	The thing being confirmed. Describe the work, not your opinion of it. “Undercut soft subgrade ch. 335–360 to 400mm and replace with imported select fill.”
That you regard it as a variation and intend to claim	Removes any later argument that you did it for free or absorbed it. One sentence.
Time impact, even if you cannot quantify it yet	Preserves the EOT position. “This work is on the critical path and we expect a delay to the following activity; an extension of time claim will follow under clause 34.”
Cost basis, even if approximate	Signals scale early. An estimate with a stated basis beats silence, and beats a number with no basis.
A request to confirm	“Please confirm this direction in writing. If our understanding is incorrect, please advise before we proceed.”

That last line does a lot of work. It converts silence into acquiescence in a practical sense — not automatically, and not as a matter of law in every case, but evidentially. A superintendent who reads “please advise before we proceed”, says nothing, and lets you build it is in a materially worse position than one who never received the email at all.

Send it the same day. A confirmation email sent three weeks later, after the work is complete and the cost is known, invites the obvious question about why it was not sent at the time.

Constructive variations: when nobody directs anything

The harder category is the variation that arrives without anyone intending to direct one. Nobody says “I am varying the contract”. Something simply changes, and the work you have to do is no longer the work you priced.

Common civil examples:

• A revised drawing issued as an “IFC update” that quietly changes a level, a pipe class, a pavement depth or a batter slope.
• A specification clarification answering an RFI in a way that requires more than the specification previously required — the answer becomes the new requirement.
• Access or staging restrictions imposed after award — a road that was to be closed is now to stay open under traffic, so the same work now needs traffic management, night works or half-width construction.
• A change in the approval conditions from a third party (a water authority, a rail authority, an environmental regulator) that the principal passes down to you.
• Directed sequencing — being told to work in an order other than the one your accepted program set out, for the principal’s convenience.

None of these arrive labelled. All of them can be variations. The test is not whether anyone used the word — it is whether the work under the contract has changed from what the contract required.

The practical discipline is a habit at drawing-revision time. When a revised drawing or a specification response lands, someone in your business has to compare it against the version you tendered and answer one question: does this change what we have to build, or how we have to build it? On a small civil job that is a fifteen-minute task per revision. Skipping it is how contractors build six weeks of changed scope without ever noticing they were entitled to claim for it — and once it is built, the argument is much harder, because the superintendent will reasonably ask why you never mentioned it.

Where you identify a constructive variation, the response is the same confirmation email described above, framed slightly differently: you are notifying the Superintendent that in your view the direction or revision constitutes a variation, describing why, and asking them to confirm or to advise otherwise before you proceed.

The sequence under AS 4000

AS 4000 sets out an orderly process. On a well-run job it is followed; on most jobs parts of it are skipped, and knowing which parts you can afford to skip is half the skill.

1. Proposed variation (clause 36.2). The Superintendent may issue a written notice proposing a variation and asking you to price it. You respond as soon as practicable, setting out the effect on the program and the date for practical completion, and the cost — including any time-related costs.^[1][2] This step is optional for the Superintendent and is the one most often skipped.
2. Direction to execute (clause 36.1). The Superintendent issues a written direction to carry out the variation. This is the step that creates entitlement.
3. Contractor-initiated variation (clause 36.3). You may request a variation for your own convenience. The Superintendent may approve it, conditionally or otherwise — but there is no automatic entitlement to extra time or money, and normally the point of such a request is that it suits you.^[3]
4. Delay notice and EOT claim (clauses 34.2 and 34.3). If the variation delays you, the time claim runs on its own track and its own clock — see §11.
5. Valuation (clause 36.4). The Superintendent values the variation according to the order of precedence in the clause.
6. Payment. The valued amount flows into the next progress claim.
7. Dispute, if any (clause 42). You keep working while it is resolved. Clause 42.1 requires performance to continue notwithstanding a dispute about payment.^[2]

Step 1 is worth defending even when the Superintendent skips it. If you are directed to do something significant with no pricing step, offering a priced proposal before you start converts a later argument about valuation into an earlier negotiation about scope, which is a much better position. It also demonstrates good faith, which matters when the file is eventually read by someone senior.

The sequence under AS 2124

AS 2124-1992 remains widely used by councils and state agencies, often in amended form, and it handles variations at clause 40. The architecture is similar but the numbering and some of the mechanics differ. Under clause 40.2, a request for an estimate of the cost and time effect of a proposed variation is to be given by written notice to the Superintendent.^[4]

The interaction with latent conditions is explicit and worth knowing: where the Superintendent determines that conditions encountered are latent conditions under clause 12.1, and considers that a variation to the work under the contract is necessary, the Superintendent must order a variation under clause 40.^[4] That is a direct route from a site condition to a paid variation, and it is one of the most valuable provisions in the form for a civil contractor.

Mechanism	AS 4000-1997	AS 2124-1992
Variations	Clause 36	Clause 40
Latent conditions	Clause 25	Clause 12
Extension of time	Clauses 34.2–34.5	Clause 35.5
Written confirmation of oral direction	Clause 20	Equivalent provision; check the executed form
Latent condition → variation	Deemed a variation and valued under clause 36 (clause 25.3)	Superintendent must order a variation under clause 40 where one is necessary
EOT claim window for a variation-caused delay	28 days from awareness of causation	28 days from becoming aware of the cause of delay

If you are unsure which form governs your contract — and on amended council contracts that is a genuinely common state of affairs — our guide to AS 4000 vs AS 2124 sets out how to tell them apart and what the standard amendments usually change. The broader family, including AS 4902, GC21 and minor works forms, is covered in contract forms beyond construct-only.

How a variation is valued

Under AS 4000 the Superintendent must value each variation, and the clause sets an order of precedence rather than leaving it at large.^[5] The practical hierarchy runs like this, and understanding it tells you exactly where to aim your claim.

1. Prior agreement between the parties. If the principal and the contractor have agreed a price for the variation, that agreed price governs. This is the top of the hierarchy and it is why pricing a variation before you build it is worth real money — an agreed price is not open to reassessment.
2. Applicable rates or prices in the contract. If the schedule of rates, bill of quantities or priced schedule contains rates that apply to the varied work, those rates are used.
3. Rates or prices adjusted as reasonable. Where contract rates are applicable but the circumstances of the variation make strict application unreasonable, the rates may be applied with a reasonable adjustment.
4. Reasonable rates or prices determined by the Superintendent. Where nothing in the contract fits, the Superintendent determines a reasonable amount — which in practice means a build-up from first principles.

Two consequences follow, and both are commercially significant.

First: agree the price in advance whenever the variation is large enough to matter. Every step down the hierarchy transfers discretion from you to the Superintendent. At step 1 you have agreed a number. At step 4 someone else determines what is reasonable and you are arguing about it after the money is spent. The effort of producing a priced proposal in the day or two before you start is almost always worth it above about $10,000 of exposure.

Second: your tendered rates follow you. If you priced an item keenly to win the job — a low rate on select fill, say, because you did not expect much of it — and the variation is for more of exactly that item, step 2 binds you to the keen rate. This is the mechanical reason unbalanced bidding is dangerous rather than clever, and it is the same trap discussed in our guide to pricing strategies for government tenders. A rate you set to win becomes the rate you are paid when the quantity triples.

When the schedule of rates does not fit

Step 3 of the hierarchy — contract rates applied with a reasonable adjustment — is where most genuine valuation arguments live, and civil contractors under-use it badly.

The point of step 3 is that a rate is not just a number; it is a number that was built on a set of assumptions. When the variation changes those assumptions materially, applying the bare rate produces an unreasonable result, and the clause anticipates that.

What changed	Why the tendered rate no longer holds
Quantity collapsed — 40m³ instead of 900m³	The rate carried mobilisation, set-up and a plant spread amortised over 900m³. At 40m³ the fixed component per unit is more than twenty times higher.
Quantity exploded — 4,000t instead of 600t	Different supply arrangement, possibly a different quarry or haul distance, and the original rate may not reflect available production efficiency in either direction.
Location changed	Same work, different access, longer internal haul, or a section under live traffic that the tendered rate assumed was closed.
Timing changed	Work moved into a wet season, into night works, or out of the sequence that let you share plant across activities.
Method forced to change	You priced open-cut; you are now directed to work in short lengths with plates over the trench each night.
Disruption to unvaried work	The variation itself is small, but it fragments a crew’s day and reduces production on everything else. This is a real and claimable effect, and the hardest to substantiate — which is why the records in contract administration matter.

Claiming a step-3 adjustment requires you to do something most contractors skip: show the build-up of the original rate, show the build-up of the varied circumstance, and identify the specific component that moved. “The rate does not work here” is not a claim. “The tendered rate carried $6,400 of set-up amortised across 900m³ at $7.11/m³; at 40m³ that same set-up is $160/m³, and we seek the rate adjusted accordingly” is a claim, and it is one a superintendent can actually assess.

If your tender build-ups are not retained in a form you can reproduce months later, this entire category of claim is unavailable to you. That is one of several reasons the estimating discipline set out in our civil cost estimating guide pays for itself long after the tender is submitted.

What substantiation has to contain

A superintendent assessing a variation claim is not trying to be difficult. They are trying to satisfy themselves — and, behind them, a council finance team or a departmental delegate — that the amount is properly payable. Substantiation is what lets them say yes without personal risk. Claims that fail usually fail because they ask the assessor to take something on trust.

A complete variation claim contains six things.

1. The entitlement. What clause you are claiming under, and what direction or event triggered it. Reference the direction number, the email, the drawing revision, or the RFI response. This is the part most claims are thinnest on and it is the part that decides the outcome.
2. The scope. What work was actually done, described the way the contract describes work — chainages, levels, quantities, materials, standards.
3. The valuation basis. Which step of the hierarchy you say applies, and why. If you are claiming at step 2, cite the item number in the schedule. If step 3 or 4, show the build-up.
4. The build-up. Labour hours by classification and rate, plant hours by item and rate, materials with quantities and supplier pricing, subcontract amounts, and your contractual margin and overhead percentages. Not a lump sum.
5. The evidence. Dockets, delivery slips, subcontractor invoices, survey, photographs with dates, site diary extracts, and the daily records showing who and what was on the job.
6. The time position. Either the associated EOT claim, cross-referenced, or an express statement that no extension of time is sought for this variation. Silence on time is read as no claim.

On the fourth point, one specific warning. Plant rates in variation claims attract more scrutiny than any other line, because there is often a gap between a contractor’s internal plant rate, the rate in a published hire schedule, and the rate embedded in the tendered items. Decide which basis you are using, state it, and use it consistently across every claim on the job. Contractors who vary the basis between claims invite a review of all of them.

Time-related costs and the EOT link

This is the most expensive misunderstanding in the whole topic, so it is worth stating precisely.

A variation claim and an extension of time claim are two different claims, on two different clocks, and approving one does not approve the other.

The variation gets you paid for the extra work. It does not, by itself, move the date for practical completion, and it does not by itself pay for the additional weeks of site establishment, supervision, amenities, insurance and plant standing that the delay causes. Those flow from the time provisions — under AS 4000, the delay notice at clause 34.2, the EOT claim at clause 34.3 within 28 days of becoming aware of the causation, the Superintendent’s assessment at clause 34.5, and delay damages at clause 34.9.^[6]

Two features of that regime are worth knowing on the day you are directed to do extra work.

The 28-day clock runs from awareness, not from completion of the work. Under clause 34.3 the EOT claim must be made within 28 calendar days of when you became aware of the causation of the delay.^[6] If a variation is directed on 14 July and takes until 30 September to build, waiting until October to claim the time is far too late. The clock started in July.

The Superintendent is also on a clock, and it works in your favour. The Superintendent must give a written direction with the assessment of the EOT within 28 days of receiving the claim. Failure to do so results in a deemed assessment and direction for the full extension of time claimed.^[6] That is an unusually powerful provision and it is routinely overlooked by contractors who never diarise the response date. Diarise it.

There is a further distinction that determines whether you get money as well as time: qualifying cause of delay versus compensable cause. A qualifying cause entitles you to the extension; a compensable cause additionally entitles you to delay costs. Compensable causes are principally acts, defaults or omissions of the Superintendent, the Principal, or their consultants, agents or other contractors, together with any additional causes listed in the Annexure.^[6] A directed variation is squarely within that category. Inclement weather, by contrast, is commonly a qualifying cause but not a compensable one — you get the time, not the money.

The full mechanics of building an EOT claim that survives assessment — the impacted program, the critical-path demonstration, concurrent delay and what prolongation costs are actually recoverable — are covered in our guide to extension of time and delay cost claims. The two documents should always be prepared together.

The five reasons variation claims get rejected

Across amended standard forms and across states, rejections cluster into five patterns. All five are avoidable.

1 · No written direction, and no contemporaneous written record

The Tuesday problem. The work was genuinely instructed, but the only record is a conversation, and the first document is a claim submitted six weeks later. Fixed by the clause 20 confirmation habit — a same-day email, every time, no exceptions.

2 · It was always in your scope

The most common substantive rejection. The superintendent points to a specification clause, a note on a drawing, or a general obligation clause and says the work was already included. Sometimes they are right. Sometimes they are relying on a catch-all — “the contractor shall provide all things necessary for the completion of the works” — which is doing more work than it can bear.

The defence is built at tender time, not claim time: a clear, recorded scope position, and qualifications lodged during the tender period where the documents are ambiguous. If you identified the ambiguity before award and had it clarified, the answer is on file. If you priced an assumption without stating it, you will struggle.

3 · Late notice, or a time bar

Standard forms contain notice periods; amended government and council contracts frequently shorten them and add express words making notice a condition precedent to entitlement. Where that is the case, missing the window can extinguish an otherwise valid claim entirely. This is the single harshest mechanism in construction contracting and it is almost always self-inflicted. The remedy is a diary system, not a better argument. See §13.

4 · Inadequate substantiation

A lump sum with no build-up, plant hours with no docket, a subcontract amount with no invoice. The claim may be entirely honest and still be unassessable. Assessors do not reject these because they doubt you; they reject them because they cannot certify a number they cannot trace.

5 · Direction from someone without authority

Underestimated, and it bites hardest on council work. A project engineer, a council supervisor, a consultant’s site representative or a superintendent’s delegate may not hold the delegation to direct a variation, or may hold it only up to a dollar threshold. The instruction was real, the person was senior, and the direction was still invalid.

Establish at the start of every contract who the Superintendent is, who holds a delegation, and what limits apply. It is usually stated in the contract particulars or the first site meeting minutes. On a job of any size, put it in writing at kick-off: we understand directions under clause 36 will come from X; please confirm. Five minutes at the start of the job, and it removes an entire category of rejection.

The amendments government and council principals make

You will rarely be handed an unamended standard form. Government and council principals amend the general conditions through special conditions, and the variation and time provisions are among the most heavily amended. When you read a contract before signing, these are the amendments to look for.

Amendment	What it does to you	What to do
Shortened notice periods — 28 days cut to 14, 10 or 7	Compresses your window to identify, assess and notify	Set your internal notice trigger at half the contractual period. Diarise from the contract, not from habit.
Notice as a condition precedent	Late notice extinguishes entitlement outright, however meritorious the claim	The highest-priority clause in the whole contract to identify. Brief every supervisor on it.
Capped or deleted delay costs	You may get the time but not the money — or a fixed daily rate well below your actual cost	Price the exposure at tender. If delay costs are capped at $800/day and your site overhead is $2,100/day, that gap is a risk item.
Deemed-assessment provision removed	The Superintendent’s failure to respond no longer works in your favour	Follow up actively; do not rely on silence producing an outcome.
Fixed margin percentages on variations	Overhead and profit on variations fixed at, say, 10% regardless of the work’s nature	Check it covers your actual overhead recovery. Small, disruptive variations are the ones that lose money under a fixed percentage.
Valuation discretion widened	Superintendent given broader power to determine rates	Push harder for step-1 agreed pricing before starting work.
Dollar or percentage limits on variation entitlement	Variations beyond a stated proportion of the contract sum treated differently	Know the threshold; it changes your negotiating position on large changes.

Reading the special conditions before you sign is not a legal luxury; on a variation-heavy job it is the difference between a claimable position and an unclaimable one. If a contract has landed and you are not sure what its notice regime requires of you, that is exactly the kind of review our post-award and mobilisation support is built for.

Security of Payment: the leverage you already have

A variation that the Superintendent has refused to value is not the end of the road, and this is the part of the picture SMEs most often do not realise they hold.

Payment may be claimed through your ordinary progress claims regardless of whether the Superintendent has approved the variation, and the security of payment legislation provides an interim remedy where the claim is not paid.^[2] Statutory adjudication runs on statutory timeframes, not on the contract’s dispute clause, and it produces a determination that is enforceable while any longer contractual argument continues.

Two practical consequences follow. First, a disputed variation should still appear in your payment claim — leaving it out to “keep the peace” forfeits the statutory route for that claim cycle. Second, the quality of your substantiation matters even more in adjudication than in contract administration, because an adjudicator has a matter of days to understand a job they have never seen and will decide on the documents in front of them.

The mechanics of payment claims, payment schedules, the reasons requirement and adjudication timeframes across each state and territory are set out in full in our guide to security of payment in Australia. Read it alongside this one — the two halves of getting paid are establishing entitlement and enforcing it, and they use different systems.

Meanwhile, clause 42.1 requires you to keep working while a payment dispute runs.^[2] Downing tools over an unpaid variation is not a remedy available to you under the contract and will usually put you in the wrong.

Variations you should not claim

A guide about claiming should be equally clear about restraint, because a contractor who claims everything is treated differently from one who claims selectively — and the difference shows up in how the marginal claims are assessed.

• Your own rework. Work that failed inspection and had to be redone is at your cost, and claiming it damages credibility on everything else in the same claim.
• Your own estimating errors. Under-measured quantities in a lump sum are your risk. Under a schedule of rates they remeasure; under lump sum they do not.
• Ordinary weather already priced. If your program carried an allowance for wet days consistent with the region, ordinary rain is not an event. It becomes claimable when it exceeds the allowance, and only then.
• Trivial amounts. A $340 variation with a full build-up costs more in administration than it recovers, and it dilutes attention from the $30,000 one in the same claim. Bundle small items into a single monthly variation where the contract allows.
• Anything you would not want read aloud. Claims are eventually read by people who were not there. Inflated plant hours and optimistic labour allocations are visible to anyone who compares the claim to the site diary — and once one line is shown to be overstated, the whole claim is treated as unreliable.

Selectivity is commercially rational, not merely virtuous. Superintendents assess claims from contractors they trust differently from claims by contractors they do not, and that difference is worth more over a year than any individual marginal claim.

A variation register that takes ten minutes a week

Everything above reduces to one artefact: a register that any person in your business can update and that tells you, at a glance, what has been claimed, what has been valued, what has been paid and what is about to fall out of time.

Column	Why it exists
Ref (VO-01, VO-02…)	One number per variation, used in every subsequent document and email. Removes ambiguity permanently.
Date of event / direction	Starts every clock in the contract.
Source	Written direction / oral direction confirmed / drawing revision / RFI response / latent condition.
Description	One line, in contract language, with chainages or locations.
Notice sent — date	The field that proves compliance with the notice regime. Blank here is a red flag.
Notice due — date	Calculated from the contract, not from memory. Colour it when within seven days.
EOT claimed? Y/N + ref	Forces the time question to be answered on every entry rather than forgotten.
Valuation basis	Agreed / contract rates / adjusted rates / reasonable. Tells you what evidence the claim needs.
Claimed $ / Assessed $ / Paid $	Three separate columns. The gaps between them are your live commercial position.
Status	Notified / priced / directed / claimed / assessed / paid / disputed.

Ten minutes each Friday. Open the register, update the status column, check the notice-due dates for the coming fortnight, and send anything that is outstanding. That single habit prevents four of the five rejection categories in §12.

Two supporting habits make it work. First, the site diary has to be filled in daily — who was on site, what plant, what was done, what the weather was, who visited and what they said. It is the evidentiary spine of every claim in this guide and it cannot be reconstructed later. Second, photographs need to be taken before, during and after any varied work, because a photograph of a completed subgrade proves nothing about what was under it. Both habits, and the notice discipline that sits on top of them, are set out in our guide to contract administration for civil SMEs.

The short version

• Get the direction in writing before the work. If you cannot, write the confirmation email the same day and ask them to correct you if you are wrong.
• Agree the price before you build it whenever the exposure is material — an agreed price sits at the top of the valuation hierarchy and cannot be reassessed.
• Treat the variation claim and the EOT claim as two claims. Answer the time question on every variation, even if the answer is “no time sought”.
• Know your contract’s notice periods and whether notice is a condition precedent. Diarise from the contract.
• Substantiate from records created at the time, not reconstructed at claim time.
• Claim selectively, price honestly, and keep the register current.

None of this is difficult. It is simply administrative work that has to happen while the job is running rather than when the money is missing — and on a civil job the gap between those two moments is where the margin goes.

References

This guide is general information for Australian civil construction businesses and is not legal advice. Contract clauses are routinely amended by special conditions, and the position under your contract may differ from the standard forms described here. All examples are illustrative. Always work from the executed contract documents and obtain advice on any claim of significance.

1. AS 4000-1997 General conditions of contract, clause 36 — variations. Clause 36.1 empowering the Superintendent to direct the Contractor to vary the work under the contract, including by increasing, decreasing or omitting part of it, changing its character or quality, changing levels, lines, positions or dimensions, executing additional work, and demolishing or removing material or work no longer required; the requirement that a variation be of a character and extent contemplated by, and capable of being carried out under, the provisions of the contract; the restriction that a variation may only be directed 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; clause 36.2 providing for a written notice of a proposed variation and the Contractor’s response covering the effect on the program and the date for practical completion together with the cost including time-related costs. ↩ ↩ ↩ ↩
2. Turtons Lawyers — How to claim a variation under AS 4000 (requirement for a written direction under clause 36.1 and the statement that varying the work without a written direction places the Contractor in breach of contract; clause 36.2 proposed-variation procedure and the Contractor’s response addressing program impact, effect on the date for practical completion and cost estimates including time-related costs; clause 20 permitting the Contractor to request written confirmation of an oral direction; recommended protective notice identifying the scope of the variation, its time and cost implications and an intention to claim; ability to claim payment through ordinary progress claims regardless of approval status, with security of payment legislation providing an interim remedy; clause 42 dispute resolution procedures and clause 42.1 requiring performance to continue notwithstanding a payment dispute; requirement to give notice of delay within 28 calendar days of becoming aware of the cause in order to claim an extension of time). ↩ ↩ ↩ ↩ ↩ ↩
3. Gemma Nugent Legal — Variations under Clause 36 of AS 4000-1997: A Practical Guide (clause 36.1 requiring a written direction from the Superintendent before varied work commences; clause 36.2 permitting the Superintendent to propose a variation and require the Contractor to assess feasibility and provide estimates of time and cost impact; clause 36.3 permitting the Contractor to request a variation for its own convenience, subject to the Superintendent’s approval, with no automatic entitlement to cost adjustment or extension of time unless specifically agreed; clause 36.4 valuation of variations based on agreed rates where applicable and otherwise a reasonable cost determined by the Superintendent, with an order of precedence for pricing). ↩
4. AS 2124-1992 General conditions of contract, clauses 12, 35.5 and 40, as described in Turtons Lawyers — How to claim a variation under AS 2124, How to claim for a latent condition under AS 2124 and What is a qualifying cause of delay under AS 2124?, and in South Australian Department for Infrastructure and Transport, AS 2124-1992 Special Conditions Template. Clause 12.1 defining latent conditions as physical conditions on the site or its surroundings, including artificial things but excluding weather conditions, which differ materially from the physical conditions which should reasonably have been anticipated by the Contractor at the time of tender; clause 40.2 requiring a request for an estimate of cost and time effect of a proposed variation to be given by written notice to the Superintendent; the requirement that where the Superintendent determines conditions are latent conditions under clause 12.1 and considers a variation necessary, the Superintendent must order a variation under clause 40; clause 35.5 requiring prompt notice of delay and an extension of time claim within 28 calendar days of becoming aware of the cause of the delay. ↩ ↩
5. AS 4000-1997, clause 36.4 — valuation of variations, applying an order of precedence beginning with prior agreement between the Principal and the Contractor, then applicable rates or prices in the contract, then contract rates or prices applied with a reasonable adjustment where strict application would be unreasonable in the circumstances of the variation, and otherwise reasonable rates or prices determined by the Superintendent. Order of precedence as described in Gemma Nugent Legal, Variations under Clause 36 of AS 4000-1997, and Construction Law Made Easy, Valuation of Variations. ↩
6. Turtons Lawyers — How to claim an EOT under AS 4000 and What is a qualifying cause of delay under AS 4000? (clause 34.2 notice of delay to be given promptly to the Principal and the Superintendent identifying the cause and the Contractor’s estimate of its extent; clause 34.3 requiring the extension of time claim to be made within 28 calendar days of becoming aware of the causation and to state the facts of causation and the delay including its extent; clause 34.5 requiring the Superintendent to give a written direction with the assessment within 28 calendar days of receiving the claim, failing which there is a deemed assessment and direction for the full extension of time claimed; the definition of a qualifying cause of delay including acts, defaults or omissions of the Superintendent, the Principal or their consultants, agents or other contractors, and inclement weather and industrial conditions before the date of practical completion, subject to the exclusions in the Annexure; the definition of a compensable cause determining entitlement to delay damages; clause 34.9 delay damages claimable for each day of a compensable cause subject to an approved extension of time, with the claim to specify the general basis and quantum with supporting documentation). ↩ ↩ ↩ ↩