Construction site log
The site log documents everything that happens during construction: work orders, approvals of progress billings, design changes, delays, weather conditions, material deliveries, breaches and any other relevant fact. Each entry is numbered consecutively, is dated, and is signed by whoever writes it and by whoever answers it; once signed it cannot be erased or altered. That is why it is the main documentary evidence in the event of a dispute, cost adjustment, price escalation or final settlement.
On public works a site log is generally mandatory. Public procurement statutes and their regulations usually require it to be kept by electronic means, through an official electronic construction log operated on the government procurement platform. A paper (conventional) log is normally allowed only when the oversight authority grants an exception —for example, when there is no internet access at the job site.
The electronic log assigns an electronic signature and time stamp to each entry, which guarantees that it cannot be altered and can be fully traced. Only authorized parties may open the log, close it and sign entries: on the owner’s side, the resident engineer and, where applicable, the supervisor; on the contractor’s side, the site superintendent. The log is opened on the date the works begin and closed when the project is completed, together with hand-over and final settlement.
On private projects a site log is not a legal requirement, but it is standard practice because of its evidentiary value. Today it is usually kept digitally within construction-management platforms —such as Matterial— that record progress, incidents, photos and locations with date and time, tying the log together with progress billings, physical progress and cost control.
Example
Entry 47 (Mar 12, 08:15): the resident engineer instructs the crew to halt the pour of the level-2 slab because of rain and water pooling on the formwork; six hours of downtime are documented. The site superintendent answers the entry, signing to acknowledge it. That record later supports the request for a time extension and prevents the delay from being charged to the contractor as its responsibility.
Slab pour
Rebar #4
Structure
FrontLevel 2 slab was poured. Rebar #4 arrived (2.4 ton). Crew of 8. Pending: electrical materials missing.
Frequently asked questions
What is an electronic construction site log?
It is the digital —and, on public works, usually mandatory— version of the site log, kept on the official government procurement platform. Every entry carries an electronic signature and time stamp that make it tamper-proof, and only the resident engineer / supervisor on the owner’s side and the superintendent on the contractor’s side may sign entries.
Is a construction site log mandatory?
On public works, yes: public procurement law and its regulations require it, generally in electronic form. On private projects it is not required by law, but it is used as standard practice because of its evidentiary value in the event of a dispute.
What is the difference between a site log and a measurement sheet?
The site log records instructions, approvals and incidents and carries legal weight; the measurement sheet is the document where the quantities of work actually executed are calculated and backed up (the measurements that support a progress billing). The site log leaves a record of the facts; the measurement sheet quantifies the work done.