In the design phase, your output is a document you hand over, and your role largely ends there. In construction supervision, your output is daily decisions made on site — and your liability for them lasts years past handover.
The practical consequence is that your only defence two years later isn't what you did, but what you can prove you did. Documentation in supervision isn't administrative overhead — it is the work itself.
The Site Visit Report: What Makes It Worth Anything?
Most site reports are written in general terms: "the site was visited and progress was observed in the works…". That phrasing protects nobody and helps nobody.
A useful report answers five specific questions:
- What work is actually in progress? By item and location within the project, not by general description.
- What conformed to specification and what didn't? Specifically, not impressionistically.
- What instructions were given? And to whom, by name.
- What is blocking progress? And which party is responsible for clearing it.
- What photographs are attached? With date and location within the project.
Photographs are the strongest element. A dated photograph of the state of work on a given day settles arguments that pages of description cannot.
RFI: Request for Information
An RFI is a formal question from the contractor about a point that is unclear, missing, or contradictory in the documents. It is neither a complaint nor an accusation — it is the mechanism that stops the contractor from interpreting what should have been clarified by you.
Three things determine how well you manage RFIs:
- Response time. Every day of delay is a potential day of standstill — and it later becomes a claim for time extension against you.
- Clarity of the response. A vague answer generates a second RFI on the same subject.
- Linking the response to its impact. Some answers carry a cost or time impact — and those must become a change order, not pass as an ordinary technical reply.
The third point is the most neglected: an office answering twenty RFIs without converting any into a change order has usually given away additional work for free without noticing.
NCR: Non-Conformance Report
An NCR is issued by the supervising office when work has been executed contrary to specification or approved drawings. It carries more weight than a note in a site report, because it mandates corrective action and is tracked until closure.
| Aspect | RFI | NCR |
|---|---|---|
| Who issues it | Usually the contractor | The supervising consultant |
| Cause | Ambiguity or gap in the documents | Work executed against what was approved |
| Timing | Before execution | After execution |
| Output | A technical response — possibly a change order | Corrective action tracked to closure |
The practical rule: a high RFI count signals documents that need improving. A high NCR count signals execution that needs controlling. Reading both together tells you where the problem actually sits — with you or with the contractor.
Tracking to Closure
Issuing the report is half the work. The other half is keeping it open until it is closed by documented action.
What gets lost in supervision isn't the reports that were never written — it is the ones that were written and never followed up. An NCR issued three months ago that nobody can say was resolved is worse than not issuing it, because it proves you knew about the non-conformance and did not pursue it.
What Changes When Supervision Lives Inside a System
Inside an engineering consultancy management system, five things change:
- Site reports are tied to the project with their dates and photographs, not kept in a separate folder
- Every RFI has a number, a date, a response, and a measurable turnaround time
- Every NCR has a clear status: open, in progress, closed
- What is open and overdue sits in one list instead of being forgotten
- The record is complete and chronological — exactly what you need in any later dispute
Frequently Asked Questions
What is the difference between an RFI and an NCR?
An RFI is usually raised by the contractor before execution to clarify ambiguity or a gap in the documents. An NCR is issued by the supervising consultant after execution when work departs from what was approved, and it requires corrective action tracked to closure.
How quickly should an RFI be answered?
As stated in the contract, commonly within 3 to 7 working days. More important than the duration is adhering to it: each day of delay can become a time-extension claim directed at the consultant rather than the contractor.
What should a site visit report contain?
Work in progress by item and location, what did and did not conform to specification, instructions given and to whom, obstacles to progress and the responsible party, and dated photographs. General phrasing such as "progress was observed" protects nobody in a dispute.
Does every observation warrant an NCR?
No. A minor observation correctable on the spot belongs in the site report. A material departure from specification or approved drawings warrants a formal NCR tracked to closure.
How long does a supervising consultant remain liable?
It varies by contract and by each country's law, and can extend years past handover — in many jurisdictions up to ten years under decennial liability for structural safety. Which is why a documented supervision record is not an organisational luxury.
Are photographs necessary in site reports?
Yes, and they are the strongest element. A dated, located photograph proves the state of work on a given day in a way pages of description cannot — especially for work later covered up, such as foundations and buried services.
Conclusion
Supervision is judged by the quality of its record, not the count of its visits. An office that can produce, three years later, a dated site report with its photographs, an RFI response with its number, and an NCR with its closure status is an office that is protected.
Review one supervision project of yours: how many NCRs are still open with nobody able to say what became of them?
Read next: Running an Engineering Consultancy — The Complete Guide From Proposal to Handover.