When a time and materials dispute or delay claim reaches negotiation or a formal hearing, the specialty contractor’s strongest evidence is usually the daily log: a contemporaneous record of who was on site, how many hours they worked, what they worked on, what conditions they faced, and what instructions they received. Logs written the same day, completed consistently, and supported by verifiable data carry far more weight than reconstructed timelines or estimates assembled after the dispute begins. Contractors who treat the daily log as a legal record, and build habits around it, are in a better position when a claim lands.
This article is general information and does not replace advice from construction counsel on a specific contract or dispute.
Why contemporaneous records matter
Construction disputes are large and slow. Arcadis’ 2025 Construction Disputes Report for North America found that the average value of disputes in North America was $60.1 million, a significant increase over 2023’s value of $43.0 million. The average time to resolve disputes fell from 14.4 months in 2023 to 12.5 months. The report ranks errors and omissions in contract documents, and parties failing to understand or comply with their contractual obligations, among the leading causes.
Over a resolution period measured in months, memories fade and project staff move on. What remains is the written record. The report also notes that real-time data tracking can provide instant access to project records, enabling quicker analysis and evidence-based decision-making.
Claims on large projects are also substantial relative to the work itself. HKA’s CRUX Insight eighth annual report on project claims and disputes, which draws on more than 2,200 projects valued at US$2.43 trillion across 114 countries, found that sums in dispute averaged 33.4% of contract budgets and that time extensions sought by contractors amounted to 65.8% of planned schedules. Change in scope remained the most common cause of conflict, affecting just over 28% of projects. Claims of that size draw close scrutiny, and the daily record is where a contractor shows what actually happened on site. The lesson for specialty contractors is direct: daily logs can support a claim or weaken it, depending on what they show and what they leave out.
What belongs in a daily log
A useful daily log answers the questions an owner, general contractor, or board will ask months later. Many firms now use construction daily log software that pre-populates each report with headcount, hours, and weather captured on site, leaving the foreman to review the entries, add notes and photos, and finalize the record. Whether a log is digital or on paper, the following content makes it useful as evidence.
Manpower and hours
Record the number of workers on site, by trade or classification, and the hours each worked. Separate base contract work from change work and time and materials work, and note which crew worked on which area. Headcount tied to individual workers carries more weight than a single number written at the end of the day.
Work performed and location
Describe what was installed or completed, and where. Specific references to floors, gridlines, rooms, or systems make it possible to connect a day’s work to the schedule.
Delays, disruptions, and access issues
Note anything that stopped or slowed work: areas not ready, missing information, other trades occupying the space, inspections that did not happen, or material that did not arrive. Record the time the disruption started, when it ended, and how many workers were affected.
Directives and instructions
Log verbal instructions from the general contractor, owner, or design team, including who gave them and when. Verbal direction that changes scope is a common source of disputes, and a same-day note is often the only record that it happened.
Equipment and materials
List equipment on site, whether it was working or idle, and significant deliveries. Idle equipment during a delay period is a cost that needs documentation to recover.
Weather and site conditions
Record temperature, precipitation, wind, and ground conditions, along with their effect on work.
| Records outlast memories
Arcadis reports that the average North American construction dispute took 12.5 months to resolve in 2024. Daily logs written the same day are often the most reliable account of what happened by the time a claim is heard. |
Time and materials work needs its own backup
Time and materials billing depends on proof of hours. Federal contracts spell this out. FAR clause 52.232-7 on payments under time-and-materials contracts requires contractors to substantiate vouchers, including subcontractor hours reimbursed at the hourly rate, with evidence of actual payment and individual daily job timekeeping records, records that verify employees meet the qualifications for the labor categories specified, or other substantiation approved by the contracting officer.
Private contracts vary, but owners and general contractors increasingly expect similar support. Practical steps for T&M work include:
- Opening a separate ticket or cost code for each change directive before work begins.
- Recording workers and hours against that ticket daily, rather than at the end of the week.
- Getting a same-day signature from the general contractor’s representative when the contract allows it.
- Attaching photos that show the work before, during, and after.
- Reconciling T&M tickets against payroll hours so billed hours match paid hours.
Weather records that hold up
Weather is one of the most common grounds for time extensions, and a foreman’s note that it rained is more persuasive with independent confirmation. The National Centers for Environmental Information explains in its guidance on NCEI data certification that the Department of Commerce certifies data maintained in the NCEI archive to meet the authentication requirements for records submitted as evidence in a court of law. Certified products include Local Climatological Data from nearby weather stations.
Pairing daily site observations with certified station data gives a contractor both the local effect, such as a flooded excavation or wind that stopped crane picks, and an independent record of the conditions that caused it.
Habits that make daily logs hold up
Content matters, and so does consistency. Logs that follow the same format every day, on every project, are easier to rely on and harder to challenge.
Complete the log the same day
Entries made days later are easier to question. A same-day log, ideally timestamped, carries more credibility.
Stick to observed facts
Record what happened and who was involved. Avoid assigning blame or speculating about causes; leave the analysis for later.
Keep logs complete on routine days
Gaps in the record invite questions. A short entry on a normal day is more useful than a missing one.
Make corrections visible
If a log needs correction, add a dated note instead of overwriting the original entry.
Store records where they can be retrieved
Logs, photos, and T&M tickets should be organized by project and date so they can be produced quickly when a claim is filed.
Building the record before it is needed
Most daily logs will never be read by a claims consultant or a board judge. The ones that are read often decide whether a contractor recovers its costs. Specialty contractors who capture accurate manpower, hours, conditions, and instructions every day, and who back those entries with independent data where it exists, enter a dispute with a record that speaks for itself.