Is a site diary a legal requirement in Australia?

Short answer: no Australian law says "you must keep a site diary". But that is the wrong question, and answering it with a flat no has cost builders a great deal of money.

Several things you are legally required to do are, in practice, done through a diary. Several more are contractual rather than statutory, which makes them no less binding. And the situation where the diary matters most is not an inspection at all. It is a payment dispute.

Here is the honest version, with the sources.

Is a site diary legally required under WHS law?

No, not by that name and not anywhere in Australia. No WHS Act, WHS Regulation, OHS Act or OHS Regulation requires a construction site diary or a daily site record. That has been checked against the Queensland, New South Wales, Western Australian and Victorian instruments directly.

What exists instead is a set of obligations a diary happens to be the easiest way to satisfy, and a set of contract terms that often require daily records outright. Those are the parts worth understanding.

Why the answers online contradict each other

Search this question and you will find vendor pages telling you a site diary is required under the WHS Regulations, and other vendor pages telling you the format is not mandated. Both are written by companies selling site diary software, including us. Almost none of them cite anything.

The confusion comes from conflating three different things:

1. Records you must keep, which are specific and named in legislation
2. Duties you must discharge, where the law says what you must achieve but not what paperwork proves it
3. Records your contract requires, which are not law at all but will still decide a dispute

A site diary is not in category one. It is the usual way of handling category two, and it is frequently mandated outright in category three.

What the law actually requires

You must consult your workers on health and safety. Safe Work Australia is unambiguous that consulting and cooperating to manage risks "is also a legal requirement", and that a PCBU must consult when identifying hazards, assessing risks and deciding how to manage them. On how, it says there is no set way consultation must occur, and that for smaller workplaces "it might be as simple as regularly talking to workers about health and safety matters", including through "usual communications, like team meetings and toolbox talks".

Note what that means. The duty is real and the method is open. If you are ever asked to show you met it, you need a record of those conversations. A diary with a toolbox talk line in it is that record.

You must notify the regulator of serious incidents, and keep a record of them. PCBUs must notify their WHS regulator immediately after becoming aware of a workplace death, serious work-related injury or illness, or a dangerous incident. Under the model WHS Act a record of each notifiable incident must be kept for at least five years from the day notice is given to the regulator.

Two other retention rules matter on site. A safe work method statement must be kept until the high risk construction work is complete, and for at least two years after a notifiable incident connected with that work. The same two-year rule applies to a WHS management plan on a construction project. And prosecutions can be brought up to two years after an offence first comes to the WHS prosecutor's notice, longer where there is a coronial inquest, which is the real reason your records need to outlive the job.

This one is changing, and most content on the subject has not caught up. In December 2025 Safe Work Australia published amendments to the model WHS Act extending notification duties to dangerous incidents involving mobile plant and falls, violent incidents including sexual assault, work-related suicide and attempted suicide, and extended worker absences of fifteen or more calendar days. Critically, those changes "will only take legal effect once they are adopted into local WHS laws", and each jurisdiction sets its own timeline. So whether they apply to you right now depends on your state. Check your regulator rather than assuming.

Induction requirements depend heavily on your state. WorkSafe Queensland states that a person must have a site-specific induction before starting construction work "other than housing construction work", and that site-specific induction "is not compulsory for workplaces where housing construction work is being carried out". The underlying duty to give workers information, training and instruction does not go away, and Queensland's regulator advises principal contractors to keep a record of who was inducted and when.

Victoria is different, and the difference is the kind that catches people out. Victoria never adopted the harmonised WHS laws and runs its own Occupational Health and Safety Regulations 2017, which contain an express site-specific training regulation: an employer must ensure a person it employs to perform construction work is provided with occupational health and safety training relating to the particular workplace where that work is to be performed. There is no housing carve-out. If you build in Victoria, site-specific training is a regulation, not a recommendation.

None of these is a site diary requirement. All of them are easier to evidence if you keep one.

Where a diary genuinely is required: your contract

This is the part that gets skipped, and it is the part that binds most small builders.

Australian standard-form construction contracts and most head contractor agreements impose record-keeping and notice obligations: notice of delay within a fixed number of days, notice of a variation before proceeding, records supporting an extension of time claim. Head contractors routinely require a daily report from every subcontractor as a condition of payment.

A contract term is not a law, but the practical consequence of missing one is often worse. A statutory breach might attract a regulator's attention. A missed notice period can extinguish your entitlement to time or money entirely.

Read your contract's notice provisions before you decide whether a diary is optional. If it requires daily records, that settles the question for that job.

The situation where it actually costs money

Every Australian state and territory has security of payment legislation, beginning with New South Wales in 1999. It gives you a statutory route to progress payments and an adjudication process that is faster and cheaper than court, with strict timeframes on every step.

Adjudication is decided on documents, to a deadline. There is no long hearing and no opportunity to reconstruct events at leisure. The adjudicator reads what each side submits.

Be careful how you read the next part, because plenty of sites overstate it. No security of payment legislation requires you to keep a site diary, and no regulator says a diary is given special weight. What is true is simpler: your claim has to be supported by something, and a dated daily record made at the time is the kind of material you would want to have. A diary entry recording that concrete booked for 7am arrived at 11:20 and stood two crew down is evidence of a delay. A recollection formed eighteen months later is not the same kind of material, however accurate it happens to be.

The builders who come off badly here are rarely in the wrong. They are usually unable to show they were in the right.

So what should a small builder actually do

Keep one. Not because a regulator will demand it, but because the two situations where you will wish you had are a payment dispute and a safety investigation, and both are decided on records made at the time.

Write it on the day. Contemporaneous is the entire value. An entry reconstructed weeks later carries far less weight, and it is obvious to anyone reading it.

Do not leave gaps. A diary with holes in it invites questions about everything else. Write "no work on site, rain" and move on.

Record delays and instructions above all. Those two sections are what disputes are actually about.

Check your own state and your own contract. Every jurisdiction except Victoria has adopted the harmonised WHS laws, Western Australia most recently in March 2022. Victoria operates under separate legislation with genuinely different obligations. The December 2025 notification changes land at different times in different jurisdictions. And thresholds differ in ways that surprise people: a construction project means $250,000 of work in Queensland and New South Wales, $350,000 in Victoria, and in Western Australia it is not a dollar figure at all but five or more people working on site at the same time.

What "good enough" looks like

You do not need a document controller or a four-page daily report. For a small residential builder, a defensible record is:

• Dated the day it happened
• Names people and companies rather than roles
• Records hours by person
• Notes delays with causes and rough durations
• Captures instructions and variations, including verbal ones, with who said what
• Carries photos of anything about to be covered up
• Has no unexplained gaps

That is achievable in about two minutes a day. How to keep a site diary covers the habit, and the free site diary template has the headings already laid out.

If you would rather not do it on paper, Foreman's site diary is built for exactly this: dated entries against the right job, hours by person, photos attached, and a CSV export when someone asks.

One detail worth knowing, because it goes to the point of this whole page. Each entry records the time it was submitted separately from the day it covers, and whether it was logged on site or off site. So the question a diary is meant to answer later, was this written at the time or reconstructed afterwards, is answered by the record itself rather than by your word for it.

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This page explains general obligations and is not legal advice. Work health and safety law differs between states and territories, and your contract may impose obligations beyond anything described here. For a specific situation, check with your state regulator or get advice on your contract.