When dealing with building defects, one of the most important steps is identifying the date of completion of the work. This date is critical because the Home Building Act 1989 (NSW) (the Act) sets strict time limits, called statutory warranty periods, for making defect claims. Once these periods expire, the right to pursue a claim is usually lost.

Under the Act, major defects must be claimed within six years, and all other defects within two years, calculated from the date the work is considered complete. The challenge is that “completion” does not always mean the day someone moves in or the day the keys are handed over. Instead, the Act sets out specific rules to determine this date.

There are two different rules, depending on whether the building work relates to a non-strata property or a new strata building.

Completion of non-strata building work (section 3B of the Act)

Section 3B applies to most residential building work that is not part of a strata scheme, such as standalone houses, duplexes that are not strata-subdivided, and home renovations.

The first place to look is the contract. If the contract clearly states when the work is “complete,” that definition will usually apply.

If the contract does not explain it, the law says the work is complete when it reaches practical completion. This means the building is essentially finished and able to be used for its intended purpose, even if minor items still need attention.

If there is still uncertainty, section 3B provides a list of default events. The earliest of these becomes the date of completion. These include:

• the day the builder hands the property over
• the last day the builder attends the site
• the date an Occupation Certificate is issued

These rules ensure a clear timeline can be identified even when the parties disagree.

Completion of new strata buildings (section 3C)

Section 3C applies only to new buildings within a strata scheme, such as apartment buildings or townhouse developments that are strata-subdivided.

For these buildings, the date of completion is the date of the earliest interim Occupation Certificate issued for the whole building (or for each separate building in the development). This certificate authorises the building to be used or occupied.

This normally provides a clear and objective completion date, which is important because the Owners Corporation is responsible for making statutory warranty claims relating to the common property, rather than individual lot owners.

Why this matters

Because the statutory warranty periods run strictly from the date of completion, getting this date wrong can mean a defect claim is made too late. Courts and tribunals enforce these time limits very strictly, so determining the correct completion date is often the first and most important step in any building defect matter.

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