What has to happen before a project reaches practical completion?

Practical completion is a defined point with consequences attached. It starts the defects liability period, it triggers a retention release, and it transfers the works to the client.

It is also widely misunderstood, because it does not mean everything is finished.

What it actually means

The works can be used for their intended purpose.

Minor items may remain, and they are recorded and rectified during the defects period. What cannot remain is anything that stops the building being used safely and as designed.

The distinction matters commercially. A contractor pushing for practical completion with incomplete work and a client withholding it over a paint touch-up are both misreading the same clause.

Commissioning comes first

Every system is not only installed, it is proven to work as designed.

**Mechanical.** Airflow balanced and measured, controls tested through their sequences, and the system run under load rather than switched on.

**Electrical.** Every circuit tested, results recorded, certificates of compliant electrical work issued.

**Fire.** Detection, alarms, suppression and the interfaces to other systems tested, with certification from the accredited practitioner. This is the item most likely to hold up an occupation certificate.

**Hydraulic.** Pressure tests, tempering valve commissioning, backflow device testing.

**Security and access control,** including credentials issued and working before the old system is retired.

Commissioning is scheduled work with its own duration. Treating it as a final-week activity is how handovers slip, because a system that fails its commissioning needs rectification and retesting.

Certification and occupation

Where an occupation certificate is required, the certifier's requirements are satisfied before it is issued, and every one of them depends on documentation from someone else.

Structural certification. Fire safety certification. Waterproofing. Compliance with the conditions of consent, which frequently include items nothing to do with the building, such as landscaping, drainage or a section of footpath.

Those consent conditions are the most common cause of delay at the end of a project, because they were set at approval and nobody revisited them until completion. Tracking them from the start rather than the finish is the fix.

The defects inspection

A joint inspection, contractor and client or superintendent, walking the works and recording items.

The list is agreed rather than issued. An agreed list is a work list. A disputed list is a negotiation that delays everything.

Items are categorised honestly: what prevents use, which must be done before practical completion, and what does not, which is rectified during the [defects liability period](/answers/the-defects-liability-period).

Handover

The documentation package: operation and maintenance manuals, as-built drawings, certificates, warranties, test results, asset information, keys and spares.

Training for the people who will operate the building. A system nobody has been shown how to run is a system that gets misused, and that shows up as a defect claim later.

This is set out in full in [handover documentation](/answers/handover-documentation-and-operation-manuals), and it is assembled through the project rather than at the end.

Why it matters on a fixed date

On a project with a school return date or an event, practical completion is not a milestone that can move.

Which means commissioning, certification and the consent conditions are tracked from early in the programme rather than discovered in the final fortnight. The whole project record is held in Monument's Integrated Management System from tender through to the end of defects, and it is what makes the final weeks an assembly rather than a search.

[Talk to Monument about a project with a fixed handover](/contact).