Site Diary

A site diary is the daily record of what happened on site. Weather conditions, workforce numbers, equipment on site, work completed, safety observations, visitors, delays — it all goes in the diary. It sounds mundane, but a well-kept site diary is one of the most valuable documents on a construction project. When things go wrong — and they will — the diary is what separates fact from opinion.

What should you record each day? Start with weather. Morning and afternoon conditions, temperature range, and whether weather affected work. This matters because weather is the single most common basis for extension of time claims. Next, record labour: how many workers from each trade, which subcontractor they belong to, and what hours they worked. Then equipment — what plant was on site, what was operational, what was idle. Note all visitors, especially council inspectors, consultants, and client representatives. Record what work was completed, what areas were active, and what milestones were reached. Finally, document any delays, incidents, safety observations, or instructions received. If something unusual happened, write it down.

Why does all this matter? Because construction disputes are resolved on evidence, and contemporaneous records carry more weight than anything written after the fact. If a contractor claims two weeks of rain delays six months later, your site diary is what proves or disproves it. If there's a workplace accident and SafeWork investigates, the diary shows what safety measures were in place that day. If a subcontractor claims five days on site but you only logged three, the diary is your evidence. Australian courts and adjudicators give significant weight to daily records created at the time of the events they describe. A diary entry made on the day carries far more credibility than a statutory declaration prepared for litigation months later.

The legal weight of site diaries in Australia is well established. Under security of payment legislation, when an adjudicator is deciding whether a delay claim or variation is valid, they look for contemporaneous documentation first. In formal disputes — whether adjudication, expert determination, or court proceedings — site diaries are routinely admitted as evidence. The key requirement is that they were created contemporaneously, meaning on the day or very close to it. A diary filled in from memory days later loses much of its evidentiary value.

The problem with traditional site diaries is that they're often handwritten in cheap notebooks, inconsistent in format, or simply not completed. A superintendent might fill in Monday's diary on Thursday from memory, which defeats the entire purpose. Paper diaries can't be searched, aggregated, or cross-referenced with other project records. They get lost, damaged, or conveniently go missing when a dispute arises.

Good project managers treat the site diary as non-negotiable daily practice. Five minutes at the end of each day to record conditions, progress, and any issues. That discipline pays for itself the first time you need to defend a claim, explain a delay to your lender, or respond to a WorkSafe inquiry. The projects that run smoothly aren't the ones where nothing goes wrong — they're the ones where everything gets written down.