The 2% Defect Bond and Waterproofing Claims (NSW)

If your apartment building is newer, there is a pool of the developer's own money set aside specifically to fix defective work, and a strict timetable that decides whether your owners corporation ever sees it. Most committees I meet know the bond exists. Very few know the deadlines well enough to protect themselves. Here is how the Strata Building Bond and Inspections Scheme actually works as at mid 2026, and how waterproofing defects, the most common kind, fit through it.

What the scheme is

Under Part 11 of the Strata Schemes Management Act 2015, a developer of a class 2 residential building over three storeys must lodge a building bond of 2% of the contract price with the Secretary before the occupation certificate is issued. It applies to the buildings that Home Building Compensation insurance does not cover (HBCF stops at three storeys), which is exactly why it exists.

Two currency notes, because this scheme moves. The legislated increase of the bond to 3% has been deferred again, to 1 July 2028, per Building Commission NSW's June 2026 announcement, so 2% remains the number for bonds lodged before then. And a voluntary alternative now exists in law: a developer who takes out decennial liability insurance (10 year strict liability cover for serious defects) is exempt from the bond and inspection machinery. DLI remains voluntary; talk of it becoming mandatory is intention, not law. The official scheme page is the place to confirm the current settings.

The timetable that decides everything

The scheme runs on two mandatory inspections by an independent building inspector, timed from completion of the building work:

• Interim report: between 15 and 18 months. Identifies defective building work.
• Final report: between 21 months and 2 years. Identifies defects from the interim report that remain unrectified, plus new defects arising from botched rectification.

The bond is then claimable, under section 209, to pay for rectifying defective building work identified in the final report. Read that twice, because it is the trap: a defect that never makes the reports never reaches the bond. The scheme also quietly extends your Home Building Act clock: where a bond is lodged, the 2 year statutory warranty period stretches to 90 days after the final report window, which matters for the non-major defects.

For a building in its first two years, this means the owners corporation's job is active, not passive: engage with the inspection process, walk the building, gather owner reports of leaks and staining, and make sure everything suspected gets in front of the inspector in time. "We assumed the inspector would find it" is a sentence I never want to hear again.

Where waterproofing fits

"Defective building work" for the scheme means work breaching a statutory warranty under the Home Building Act 1989, and waterproofing is expressly one of that Act's "major elements". So membrane failures, leaking balconies, planter boxes and podium decks are squarely the kind of defect the bond exists for.

They are also the most likely defect your building has. The NSW Government's own strata defect surveys have waterproofing as the most common serious defect in new apartment buildings, survey after survey. The catch is that waterproofing failures are shy: they hide behind finishes and show up as intermittent stains long before anyone calls them a defect. Which is why a building approaching its interim inspection should be actively looking, and why an independent read of the symptoms before the final report can be worth many times its fee. If water is already appearing somewhere, start with the balcony guide and the wider who pays question.

What I would do at each age of building

• Under 15 months old: start the defect log now. Collect every owner's photos and reports centrally. Commission your own defect inspection before the interim window so the statutory inspector starts from evidence, not a blank page.
• 15 to 24 months old: this is the live window. Push suspected waterproofing issues into the interim and final reports, with investigation behind them where needed. Diagnosis matters here: "balcony stains, cause unknown" argues worse than "membrane termination failure at thresholds, units 12, 15 and 21".
• Past 2 years: the bond window has closed, but nothing else has. Statutory warranties (6 years for major defects like waterproofing), the DBP duty of care reaching back 10 years, and Building Commission NSW rectification orders all remain. The map of those avenues is in who pays for waterproofing defects in strata.

Where I fit

The bond process pays for rectifying defects, but it does not diagnose them, design the repair, or check the rectification was real, and defects "fixed" badly in year two are how buildings end up wet again in year six with the bond long gone. That is the work I do as an independent remediation architect: investigation and evidence for the inspection window, then designed repairs that specialist builders price and build, inspected at the points that matter. For class 2 buildings that design work is itself regulated under the DBP Act.

If your building is inside its bond window, treat the timeline as the emergency it quietly is. A Class 2 waterproofing consultation is $660 with a diagnostic site visit, and the wider service is described at waterproofing remediation.