What belongs in an ITP?
An Inspection & Test Plan specifies, for each activity: what gets checked, against which standard, by whom, and at what intervention level. The intervention level is the part that carries consequences — hold point, witness point, surveillance, or document review. It is the contract for quality verification, and the WIRs on site are raised against its lines.
The four intervention levels
A hold point is mandatory: work stops until the designated authority inspects and releases it in writing. Proceeding past an unreleased hold point is itself a non-conformance, and can end in demolition or opening-up orders at the contractor’s cost.
A witness point is an invitation: the authority is notified and may attend, but if they do not appear within the agreed notice window, work may proceed — with the no-show recorded.
Surveillance is ongoing monitoring rather than a gate. Document review covers mill certificates, test reports and similar evidence.
What each ITP line has to say
A line without an acceptance criterion is not a quality check; it is a note. And a line without an intervention level leaves the most consequential question — does work stop? — to be argued about on site, on the day.
- The activity, and the point in it at which verification happens
- What is being checked — the acceptance criteria, not just the name of the check
- The standard or specification clause it is checked against
- Who inspects, and who releases
- The intervention level — and therefore whether work stops
Terms
References
- module: /modules/inspections/ — ITP intervention levels and WIR sequencing
Zepth is the construction project delivery platform — it runs construction, procurement and asset management on one record, and does the work: reading the drawings, reviewing the submittals, matching the invoices and flagging the risks, with a human sign-off on anything consequential.
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