How long does a builder have to fix defects in Australia?

In Australia, once you give your builder written notice of a defect, they are generally required to respond within 10 to 20 business days and carry out rectification within a reasonable timeframe — typically 60 to 90 days depending on the state and the nature of the defect. The exact rules vary by jurisdiction, but the principle is the same: the obligation doesn’t disappear just because you’ve moved in.

This guide explains what timeframes apply in each state, what triggers them, and what your options are if your builder isn’t moving fast enough.

The defects liability period — when the clock starts

The defects liability period (DLP) is the window after practical completion during which your builder is contractually obligated to return and fix defects at no cost to you. It sits on top of the statutory warranty period, which runs longer and covers more serious issues.

The DLP is typically specified in your building contract. Under the standard HIA and MBA contracts used across Australia, the DLP is commonly set at 3 to 6 months. Some contracts extend this to 12 months, and several states have minimum periods enshrined in legislation.

The statutory warranty period is separate and more powerful — it covers structural and major defects for 6 to 10 years depending on your state, regardless of what your contract says.

Timeframes by state

New South Wales

Under the Home Building Act 1989 (NSW), builders are required to fix major defects for 6 years after completion and minor defects for 2 years. The statutory warranty applies whether or not it is written into the contract.

Once you give written notice of a defect, your builder must respond within a reasonable time. Fair Trading NSW generally treats 15 to 20 business days as reasonable for acknowledgment, and 60 days for rectification unless the defect is urgent (for example, a water leak causing damage). For emergency rectification — such as a burst pipe or major structural failure — 24 to 48 hours is expected.

Queensland

In Queensland, the QBCC (Queensland Building and Construction Commission) sets minimum defect liability periods through the Queensland Building and Construction Commission Act 1991. The standard DLP is 6 months from the date of practical completion. The statutory warranty period is 6 months and 6 years and 6 months respectively for non-structural and structural defects.

Builders must rectify defects notified during the DLP within a reasonable time. QBCC guidance suggests 40 business days from the date of notice for most defects. For urgent defects causing ongoing damage, the QBCC expects faster action.

If your builder doesn’t rectify within this window, you can lodge a complaint with the QBCC and request a site inspection. The QBCC has the power to issue direction-to-rectify notices.

Victoria

Victoria’s Domestic Building Contracts Act 1995 requires builders to fix defects and incomplete work notified during the defect liability period, which is typically defined in the contract (commonly 3 to 12 months).

Under VBA (Victorian Building Authority) guidelines, a builder must respond to a defect notice within 10 business days and complete rectification within a timeframe that is reasonable given the complexity of the work. The statutory warranty period for structural defects is 10 years.

If your builder ignores your notice, the first formal step is the Domestic Building Dispute Resolution Victoria (DBDRV) process before escalating to VCAT.

Western Australia

The Home Building Contracts Act 1991 (WA) includes a defect liability period of 12 months from the date of practical completion, which is among the most generous in Australia. Builders must fix notified defects within this period.

For structural defects, a 6-year statutory warranty applies. Builders must respond to notices within a reasonable period — the Department of Energy, Mines, Industry Regulation and Safety (DEMIRS) considers 15 business days reasonable for acknowledgment.

South Australia

The Building Work Contractors Act 1995 (SA) provides a minimum 12-month defect liability period. As in other states, builders must rectify defects notified during this window. Consumer and Business Services (CBS) SA oversees complaints if the builder does not comply.

Australian Capital Territory

Under the ACT’s Building Act 2004 and associated regulations, a 12-month defect liability period is standard. If rectification is not completed, the ACT Civil and Administrative Tribunal (ACAT) can issue orders.

What a defect notice needs to include

The clock doesn’t start until you give proper written notice. A defect notice should include:

Your name and the property address
A description of each defect (be specific — “cracked render on south wall, approximately 40 cm, running diagonally from window frame”)
The location of each defect
When you first noticed it
Your contact details and a request for a written response

Send the notice by email and registered post so you have proof of delivery. If your builder disputes they received it, the registered mail receipt closes the argument.

What counts as a “reasonable” timeframe for rectification?

Australian consumer law and building regulations don’t set a universal fixed number for rectification — they use “reasonable time,” which courts and tribunals interpret based on:

The severity of the defect (structural vs cosmetic)
Whether the defect is causing ongoing damage
The complexity of the repair
Availability of materials and trades

As a general guide:

Urgent defects (water ingress, structural risk, no functioning bathroom): 24–72 hours
Non-urgent but significant defects (roof leak not actively raining, cracked foundations): 10–20 business days
Minor cosmetic defects (paint touch-ups, door adjustments): 30–60 business days

If the builder is going to take longer than these windows, they should communicate a revised timeline in writing and explain why.

If your builder is unresponsive

Silence from a builder after a defect notice is one of the most common frustrations homeowners face. Here’s the escalation path:

Follow up in writing — Send a second notice referencing the first, with the date it was sent and the lack of response. Keep the tone professional but firm.
Invoke the dispute resolution clause — Most building contracts include a formal dispute resolution process. Trigger it in writing.
Lodge a complaint with your state regulator — QBCC (QLD), Fair Trading NSW (NSW), DBDRV then VCAT (VIC), DEMIRS (WA), CBS (SA). Each has a complaint lodgement process and can issue direction-to-rectify notices.
Seek independent legal advice — If the defects are significant and the builder is non-compliant, a solicitor experienced in building law can advise on your options including NCAT (NSW), VCAT (VIC), or ACAT (ACT).

Documenting defects before you notify

The strength of your defect notice depends entirely on the quality of your documentation. Photographs, video walkthroughs, and written descriptions taken close to when the defect appeared are far more valuable than documentation gathered months later.

Use a consistent system: capture the defect from multiple angles, include a reference object for scale, note the location clearly, and timestamp everything. A dedicated app like Checka lets you capture issues during or after your practical completion inspection and generate a formal defect report your builder can act on — reducing back-and-forth and creating a clear paper trail from day one.

Key takeaways

Builders are typically required to respond to defect notices within 10–20 business days, with rectification expected within 30–90 days depending on severity and state.
The defects liability period (DLP) is your most immediate protection — typically 3 to 12 months after practical completion.
Statutory warranty periods provide longer-term coverage: up to 10 years for structural defects in some states.
Always give defect notice in writing and keep copies — the clock starts when notice is received, not when you call.
If your builder doesn’t respond, escalate to your state regulator: QBCC, Fair Trading NSW, DBDRV, or their equivalent.
Thorough documentation is your strongest asset — capture defects with photos, descriptions, and timestamps as soon as you find them.