A site instruction is one of the most important documents in the construction contract administration toolkit — and one of the most frequently issued informally, verbally, or not at all. That gap between what was directed and what was documented is the source of more disputes than almost anything else on a construction project.
This article covers what a site instruction is, when it should be issued, what it needs to contain, and how to manage them properly.
What is a site instruction?
A site instruction (SI) is a formal written direction issued by a superintendent or contract administrator (CA) to a contractor during the course of a construction project. It is the principal mechanism by which the principal's representative communicates directions, clarifications, and orders to the contractor.
Site instructions are contractually significant documents. Under most standard form contracts — AS 2124, AS 4000, AS 4902, GC21 — the superintendent has the authority to issue directions that the contractor is obliged to follow. A site instruction is how that authority is exercised formally.
When should a site instruction be issued?
Site instructions are appropriate in any of the following situations:
Variations to the scope of work. Where the principal instructs a change to the works — additional work, omitted work, or a change in specification — the direction should be captured as a site instruction before the work commences. This establishes the basis for any variation claim.
Defect rectification. Where a defect or non-conformance is identified and the contractor is directed to fix it, the direction should be in writing. A verbal "can you sort that out?" is not a contractual direction.
Method or sequence directions. Where the superintendent requires a specific method of working, a particular construction sequence, or a change to how work is being executed for safety, quality, or interfacing reasons.
Clarifications and interpretations. Where the contractor requests a ruling on the meaning of a specification, drawing, or contractual requirement, and the superintendent provides a formal response.
Stop work directions. Where the superintendent requires work to cease on all or part of the site — for safety, quality, or other contractual reasons. These should be issued promptly and in writing.
What a site instruction should contain
A well-written site instruction should include:
- A unique reference number — typically SI-[PROJECT CODE]-[SEQUENCE] (e.g. SI-CBA22-014)
- Project name and number
- Date of issue
- Issued by — name and role of the issuing superintendent or CA
- Issued to — contractor name (and subcontractor name if relevant)
- Priority/urgency level — routine, urgent, or stop work
- A clear description of the instruction — specific, unambiguous, and referencing the relevant drawing, specification clause, or contract provision
- Any deadline for compliance
- Acknowledgment requirement — whether the contractor is required to respond, and by when
The description is the most important element. Vague instructions create disputes. "Please address the concrete quality issue on Level 2" is not a site instruction. "The concrete placed in Grid B3-B7 between [date] and [date] has been identified as non-conforming under Clause [X] of the specification. The Contractor is directed to submit a Non-Conformance Report and rectification proposal within 5 business days" is a site instruction.
Urgency levels
Not all site instructions carry the same weight or time pressure. A standard classification system:
Stop Work — immediate cessation of specified activities is required. Typically issued for imminent safety risk, serious non-conformance, or contractual breach. Should be followed up with a formal notice under the contract.
Urgent — action required within 24 hours or before the next working day. Used for time-sensitive directions that can't wait for normal communication cycles.
Routine — standard direction to be actioned in the normal course of work, within the timeframe specified in the instruction.
Using consistent urgency classifications helps contractors prioritise and creates a record of how time-sensitive each direction was at the time of issue.
The acknowledgment process
One of the most common failures with site instructions is the lack of a documented acknowledgment. The instruction is issued; there's no record of whether it was received, understood, or acted upon.
A proper acknowledgment process:
- SI issued with an acknowledgment requirement and due date
- Contractor representative acknowledges receipt — preferably in the same system, with their name and signature
- Contractor submits any required response (variation estimate, rectification proposal, programme impact)
- Superintendent reviews and responds
This closed-loop process creates a complete, timestamped record of the instruction and the contractor's response — exactly what's needed if the instruction becomes the subject of a dispute or a payment claim.
Managing site instructions digitally
The traditional approach — a Microsoft Word template, email distribution, a folder on a shared drive — works until it doesn't. Common failure modes:
- Instructions sent to the wrong email address or personal phones
- No record of whether the instruction was received and read
- SIs issued out of sequence or with duplicate numbers
- Acknowledgments tracked in a separate spreadsheet that doesn't match the SI register
- Stop work instructions that exist as voicemails rather than documents
Digital site instruction management platforms issue instructions with auto-numbering, capture electronic acknowledgment, and maintain a complete log of every instruction issued — who sent it, when it was received, and how the contractor responded.
HoldPoint QA includes site instructions alongside ITPs and labour dockets in a single project workspace. Each SI is auto-numbered, has a configurable urgency level, and requires a named acknowledgment — giving both principals and contractors a defensible record without the spreadsheet overhead.