The defect liability period, explained for Australian builders.

What the defect liability period is

The DLP starts at practical completion and runs for the period set by the contract. Twelve months is common on commercial projects, and shorter periods such as thirteen weeks or six months appear in some residential and minor works contracts. The contract, not a statute, sets the period, so always work from the executed contract for the project.

During the DLP the principal or owner reports defects that emerge, and the builder is obliged to rectify them within a reasonable or specified time. Part of the retention or security is usually held until the DLP ends and a final certificate issues.

What the DLP covers, and what it does not

The DLP covers defective work and materials that emerge in the completed works. It does not usually cover fair wear and tear, damage caused by the occupant, or maintenance items. Disagreement about which side of that line an item falls on is one of the most common DLP disputes, and photographic evidence of the condition at handover is usually what settles it.

• Defects raised during the DLP are separate from the practical completion defect list, but both belong in the same project record.
• The end of the DLP does not end all liability: statutory warranties and latent defect exposure can continue beyond it.
• Security or retention release is normally tied to rectification of notified DLP defects.

How the states overlay the contractual DLP

The DLP itself is contractual, but statutory warranty and regulator regimes sit alongside it and keep running after it ends. The overlay differs by state, and for residential work it usually matters more than the DLP itself.

In New South Wales, residential building work carries statutory warranties under the Home Building Act: six years for major defects and two years for other defects, running from completion of the work. In Victoria, domestic building work carries implied warranties, and building actions are subject to the ten-year limitation period that runs from the occupancy permit or certificate of final inspection. In Queensland, the QBCC can direct rectification of defective building work for up to six years and six months after completion, with shorter notification windows under the statutory insurance scheme.

None of this changes the practical advice: the contractual DLP is what the contract says, the statutory overlay is what the state says, and both are easier to live with when the handover record shows the condition of the works and the rectification history. Check the executed contract and current regulator guidance for the specific project.

Running the DLP without losing the thread

DLP defects arrive one at a time, months apart, from a client who has moved in. The builder’s risk is not usually the rectification work itself but the thread: which items were notified, which were accepted as defects, which contractor was sent back, whether the work was done, and whether the client agreed it was closed.

Treat each DLP item exactly like a closeout defect: capture it with photos and location, assign it to the responsible trade, verify the rectification, and keep the closed record with the project. SiteWarden keeps DLP items in the same project record as the practical completion defect list, so the handover evidence and the post-handover items live together.

Practical completion sets up the DLP

The cleanest DLPs follow the cleanest handovers. A thorough practical completion defect list with photo evidence establishes the condition of the works at day one of the DLP, which protects both sides: the client can point to what was outstanding, and the builder can distinguish new damage from defective work.