Reldro

Reporting

Incident investigation timeline: separate sequence from assumptions on construction sites

For subcontractors and safety managers: an incident investigation timeline records the sequence of events and the evidence behind it. Keep the chronology separate from causal findings so reviewers can distinguish what is known from what is inferred.

By Reldro · · 2 min read

Reldro Investigation detail: facts, sequence, contributing factors, evidence check, linked corrective actions (no blame wording).

The practical starting point

For your subcontractor crews, use this guidance with the current work phase, trade responsibilities and approved procedures in view. Keep your safety manager involved in record reviews and follow-up. This guidance supports record keeping and coordination, not technical authorization to carry out the work.

An incident investigation timeline records the sequence of events and the evidence behind it. Keep the chronology separate from causal findings so reviewers can distinguish what is known from what is inferred.

Collect context without forcing agreement

After the immediate response and scene arrangements under your procedure, gather relevant accounts and records. People may remember timing differently. Note conflicting or uncertain details rather than selecting the most convenient version. Access and retain evidence according to your organization’s privacy and investigation requirements.

What to include

Keep the record understandable to someone who was not present. Clear details help the reviewer ask the right questions and decide what further information is needed.

  • Events before the incident
  • People and activities at each point
  • Evidence supporting recorded times
  • The incident and subsequent response

An unloading example

A material stack shifts during unloading. A useful timeline records delivery arrival, unloading activity, nearby work and the response, with the source for each detail. If two accounts disagree about when another worker entered the area, the discrepancy belongs in the record until investigators can assess it.

Review and follow through

Agree how your team will use the record before rolling out a new form. Check a few real examples with the people responsible for the work, then refine unclear wording and ownership gaps.

  • Identify the source for important events.
  • Mark approximate times as approximate.
  • Keep unexplained gaps visible.
  • Connect the timeline to the investigation evidence.

The takeaway

Build a chronology that another reviewer can follow, including uncertainties. Analyze causes after considering the evidence.

Sources and further reading

References for this article, published October 6, 2026. Product scope and requirements can change. Confirm details with the provider and your safety team. Guidance from a specific jurisdiction may not apply to your construction project.

See the workflow in Reldro

Explore incident investigations
Request a demo

Keep reading

Reporting

How to build a hazard reporting process crews can use on construction sites

For subcontractors and safety managers: a hazard reporting process gives workers a simple way to record a concern and gives the safety team a clear route from review to follow-up. The process needs both parts: easy intake and visible responsibility after submission.

Reporting

Near miss reporting: what to capture after a close call on construction sites

For subcontractors and safety managers: a near miss is a close call that could have resulted in harm but did not. Recording it gives the team a chance to understand the circumstances and consider follow-up without waiting for an injury.

Reporting

Safety concern triage: severity, ownership and the next step on construction sites

For subcontractors and safety managers: safety concern triage is the first review of an incoming report: assess urgency, establish who owns the next step and identify what information is still needed. It is not a reason to leave lower-priority concerns unowned.

All articles