What a Log Entry Is and What It Is For
The construction log is the document where everything relevant that happens on the job is recorded in chronological order. Each entry is signed by whoever writes it and, on public works, authorized by the resident engineer and the supervisor.
Its real purpose is to serve as evidence: when there is a disagreement over a delay, a payment, a design change, or a defect, what settles it is what was written and signed in the log, not what each party remembers. That is why what you record matters as much as what you leave out.
What to Record Every Day
A complete daily entry always covers the same items. Even when the day feels routine, it is worth recording them all so the history stays continuous.
- Date and consecutive entry number, so there are no gaps in the sequence.
- Weather and site conditions (rain, extreme heat, wind, standing water): they are the justification for many delays.
- Crew on site: how many workers and of which trade (masonry crews, steel fixers, MEP installers), and which subcontractors are present.
- Equipment and machinery working or idle, and why it is idle if that is the case.
- The day's activities and the work front where they were carried out (for example, pouring the level 2 slab, tying rebar for the confining columns on gridline 4).
- Physical progress achieved, preferably with a quantity and a unit (m2 of plaster, m3 poured, linear meters of pipe laid), not just 'progress was made.'
- Materials received: what arrived, how much, and whether it came complete or with shortages or damage.
- Instructions given or received: orders from the supervisor, design changes, authorizations.
- Incidents: accidents, stoppages, visits, lab tests, partial deliveries.
What You Must Never Leave Out
Everything counts, but there are records that, if missing, leave the job with no defense. These are the ones that must never go unrecorded on the same day they happen:
- Instructions and change orders: any direction that changes the design, the scope, or the way work is carried out. If it was verbal, write it down and ask to have it confirmed.
- Causes of delay outside the contractor's control: materials not supplied by the owner, incomplete drawings, pending permits, undecided items. They are the basis for requesting a time extension.
- Work suspensions and stoppages, with the time and the reason (rain, no work front available, safety, non-payment).
- Materials or equipment supplied by the owner, and their condition, to assign responsibility if they arrive faulty.
- Accidents and safety incidents, even when no one is injured.
- Approvals and sign-offs (of rebar before pouring, of levels, of finishes): they protect you against a later rejection.
How to Write an Entry So It Holds Up
An entry is only as good as its precision. The rule is to write verifiable facts, not impressions. Instead of 'there were problems with the concrete,' record 'the 10:40 truck was rejected for a slump out of range; a replacement was requested from the supplier.'
Write it the same day, because a log 'filled in' days later loses credibility and evidentiary value. Use quantities, times, and the names of the people responsible; avoid crossings-out and blank spaces between entries, since entries must be consecutive and without gaps.
From the Notebook to the Digital Log
Many of these entries are still written by hand and end up illegible, incomplete, or lost. Recording the daily report digitally —with photos of the progress, crew, weather, and materials of the day tied to the date— means nothing gets left out and the information is searchable later.
With Matterial's construction log, the site superintendent captures the day's report from the jobsite and the history stays organized and backed up, ready to build the weekly report or defend a progress estimate without relying on anyone's memory.