Builder’s Warranty in NSW: Your 6-Year Structural Guarantee Explained

Most new home buyers in NSW have only a vague idea of what their builder’s warranty actually covers and for how long. Builders often add to the confusion with marketing that highlights one element while staying quiet on another. Here is what you actually have.

The two statutory warranty periods

Under the NSW Home Building Act 1989, residential builders are bound by two statutory warranties:

• 6 years for major structural defects, starting from the completion of the work (handover).
• 2 years for non-structural defects, also starting from completion.

These are minimums. A builder cannot offer you a contract with less. Builders can offer more, and some marketing-led builders advertise 10-year guarantees, but read the fine print, the extended portion often excludes structural items.

What is a major structural defect

NSW Fair Trading defines a major structural defect as a defect that affects:

• Load-bearing elements (slab, frame, beams, columns)
• The durability of the home (rot, severe deterioration)
• Watertightness of the building (roof leaks, severe waterproofing failure in bathrooms causing structural damage)
• The structural integrity of any major component

Examples we have seen claimed successfully under the 6-year warranty:

• Slab cracking through reactive clay due to inadequate piering
• Roof truss failure causing ceiling sag
• Wall frame moisture intrusion through inadequate weatherproofing
• Retaining wall failure
• Severe bathroom waterproofing failure damaging the slab

What is non-structural

Cosmetic or functional issues that do not threaten the structure:

• Tile lippage in bathrooms
• Hairline cracks in plaster
• Paint defects, including poor finish over time
• Doors not closing properly
• Kitchen joinery alignment
• Electrical fitting installation issues
• Render cracking (cosmetic, not structural)

These have a 2-year warranty. After 2 years, the builder is not legally obliged to fix them, although many will under goodwill.

What is NOT covered under any warranty

• Wear and tear (normal use of fittings, finishes, appliances)
• Damage from owner modifications
• Damage from misuse (e.g., furniture impact, scratches)
• Acts of nature beyond reasonable design (severe storms, earthquakes)
• Defects that the owner should reasonably have noticed at handover
• Manufacturer warranties on appliances (covered separately by the appliance brand)
• Settlement cracking in the first 12 months (this is normal and expected as the home dries out)

The 90-day maintenance period

Separate from the statutory warranties, most NSW builders offer a 90-day maintenance period after handover. This catches anything that emerges as the home settles: minor cracks, doors needing adjustment, paint touch-ups. The maintenance period typically includes one comprehensive review at around 60 to 90 days post-handover.

The maintenance period is not a legal requirement, but it is industry standard. Builders who do not offer one are unusual and should be asked why.

Home Owners Warranty insurance

For any NSW residential build over $20,000, the builder must hold Home Owners Warranty (HOW) insurance. This insurance is project-specific and covers you in three specific situations:

• Builder becomes insolvent during the build
• Builder dies before completing the build
• Builder cannot be located to honour warranty claims

HOW is not a substitute for the builder’s warranty itself. It is a safety net if the builder is no longer able to fulfil their warranty obligations. The certificate must be issued to you before any deposit is paid.

How to make a warranty claim

1. Write to the builder identifying the defect, with photos and the date of completion (start of warranty period).
2. Allow reasonable time to respond. 21 days is typical for the builder to inspect and assess.
3. If the builder agrees, schedule the repair work. If they dispute or delay, document everything in writing.
4. If unresolved, lodge a complaint with NSW Fair Trading.
5. If still unresolved, apply to the NSW Civil and Administrative Tribunal (NCAT). Most warranty disputes settle at NCAT mediation rather than full hearing.

What can void your warranty

• Modifications to the structure without the builder’s consent (e.g., removing a load-bearing wall during a renovation)
• Failure to maintain the home reasonably (severe water damage from blocked gutters, etc)
• Engaging unlicensed tradespeople to work on the home

Routine maintenance and ordinary occupancy do not void the warranty.