A site diary is a daily record of activity on a construction site, capturing progress, labour, deliveries, weather, visitors, and events.

A site diary is a chronological record of what happens on a construction site each day. It typically logs the work carried out, labour and plant on site, deliveries, weather conditions, visitors, instructions received, and any incidents or delays. It is usually kept by the site manager or supervisor.

Although keeping a site diary is not a specific legal requirement, it is a long-established practice and a valuable contemporaneous record. It supports project management, provides evidence in the event of contractual disputes or delay claims, and can be important if an incident is later investigated.

A consistent, dated site diary, ideally with supporting photos, gives an accurate account of site history that memory alone cannot provide, which is why many contractors treat it as an essential daily discipline.