FIDIC

Practical Completion Under FIDIC — Definition, Certificate, and Effects

Practical completion is the transition point from construction to use. It is the milestone at which the contractor’s primary obligation ends, retention begins to be released, and the defects liability period begins. Understanding what constitutes practical completion — and when the certificate should be issued — is fundamental to FIDIC contract administration.

7 min read · Updated 23/05/2026

In this article

1. Practical Completion — The Legal Threshold
2. Certificate of Completion
3. Snagging and Outstanding Items
4. Defects Liability Period — Trigger and Duration
5. Contractual Effects of Practical Completion
6. Disputes About Practical Completion

Key takeaway

Practical completion is a threshold, not a standard of perfection. The works must be complete for all practical purposes and fit for beneficial use. Minor snagging does not prevent certification. Defects that prevent safe use or functional compliance do. The engineer’s assessment must be fair, timely, and documented.

1. Practical Completion — The Legal Threshold

FIDIC Red Book 2017, Clause 10.1 defines practical completion as the stage when the contractor has completed all work under the contract (except for items specifically identified as outstanding or to be done during the defects liability period), the works are ready for use for the intended purposes, and they conform to the contract requirements.

The legal test is not perfection. Minor items, cosmetic finishes, and de minimis defects do not prevent certification of practical completion. The test is whether the works are substantially complete, can be used for their intended purpose, and the contractor has substantially performed its contractual obligations.

This was confirmed in case law (e.g., H W Nevill (Sunblest) Ltd v William Press & Sons Ltd [1981]) and is consistently applied by arbitration tribunals: practical completion is a threshold of substantial completeness, not an absolute or final state.

What prevents practical completion: significant functionality defects (systems that do not work); non-compliance with statutory requirements (building regulations, fire safety) that prevents occupation; major incomplete elements of scope; or defects that would require the owner to close or partially shut down the building immediately after take-over.

What does not prevent practical completion: outstanding paint touch-ups; minor cracks in non-structural elements; incomplete minor fit-out items; or non-critical cosmetic defects.

2. Certificate of Completion

The engineer issues a Certificate of Completion (also called the Taking Over Certificate under Clause 10.1 of FIDIC Red Book 2017) when, in the engineer’s opinion, practical completion has been achieved. This is not a discretionary judgment — the engineer must issue the certificate when the legal threshold is met.

The certificate should identify: the date of practical completion; the works to which it applies; any outstanding items or conditions; and the commencement date of the defects liability period.

The certificate triggers several important contractual effects: the defects liability period begins (and the liquidated damages regime ends); the first half of retention is released; the contractor’s insurance obligation changes; and the employer’s obligation to pay the contractor shifts (final payments become due).

3. Snagging and Outstanding Items

Snagging is the process of identifying minor outstanding items that remain after the main construction. This includes: paint touch-ups and colour variations; minor patching in finishes; completion of non-critical fit-out; and similar items that do not affect functionality or safety.

The presence of a snagging list does not prevent practical completion. A building with a substantial snagging list — but which is functionally complete and safe to occupy — has achieved practical completion. The snagging items are then managed through the defects liability period, where the contractor is obliged to complete them.

The engineer should prepare a snagging schedule at the point of certification, identifying the items remaining. This schedule becomes the basis for the contractor’s obligations during the DLP. Items not on the snagging schedule are assumed to be complete, and attempting to require their completion later may be considered a breach of the completion certificate.

4. Defects Liability Period — Trigger and Duration

The defects liability period (DLP) commences on the date of the Certificate of Completion. It runs for 52 weeks (one year) unless the contract specifies a different period. During the DLP, the contractor is obliged to remedy any defects that emerge, at its own cost.

At the end of the DLP, the engineer prepares a Final Certificate of Defects Remedied (or equivalent), confirming that all notified defects have been addressed. On issue of this certificate, the second half of retention is released, and the contractor’s warranty obligations (except for latent defects) end.

The DLP is not unlimited — it has a defined endpoint. Items not notified during the DLP, or items notified but not addressed by the end of the DLP, may not be recoverable from the contractor through the DLP mechanism (though they may remain actionable as defects under the contract’s general warranty).

5. Contractual Effects of Practical Completion

Practical completion triggers a cascade of contractual effects:

6. Disputes About Practical Completion

The most common dispute is between the engineer (who believes practical completion has been achieved and certifies accordingly) and the employer (who believes outstanding work prevents certification).

The engineer’s role is to assess objectively whether the legal threshold has been met. If the works are substantially complete and fit for use, practical completion should be certified even if a snagging list exists. The engineer should not withhold the certificate as leverage or to preserve the contractor’s motivation to complete snagging — the certificate is not a bargaining tool, it is a technical assessment.

Where the engineer unreasonably refuses to certify practical completion, the contractor may have grounds to challenge the refusal and to seek a determination that practical completion was achieved on an earlier date. This has serious financial consequences: the employer loses the liquidated damages regime, retention begins to be released, and the contractor’s obligations shift to defects remediation only.

Disputes about practical completion are typically resolved through the engineer’s determination (if the contract provides for it) or through arbitration. These disputes are usually fact-intensive, turning on whether specific outstanding items prevent the works from being fit for use.

Practical Completion Disputes Resolution

We advise on practical completion assessment, disputes with engineers, and the commercial implications of different completion dates. This is often the most contentious milestone in FIDIC project delivery.

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