Builder's guide to the defects liability period — how to manage it and protect your business

The defects liability period (DLP) is the defined window after practical completion during which homeowners can notify defects for free rectification. For builders, how you handle the DLP defines your reputation as much as the quality of the build itself — and it determines whether a customer becomes a referral source or a tribunal opponent.

What the DLP requires of builders

Under most HIA and MBA standard residential building contracts, the DLP is 13 weeks from practical completion. Some contracts specify a longer period, and state legislation may impose minimum DLP requirements that override a shorter contractual period.

In Queensland, the minimum DLP under the QBCC Act is 12 months for licensed residential builders, regardless of what the contract says. Builders in Queensland should note this — a contractual DLP of 13 weeks does not reduce the Queensland statutory minimum.

During the DLP, a builder must:

• Respond to written defect notifications from the homeowner within the timeframe specified in the contract
• Inspect and assess each notified defect
• Rectify defects that are legitimate under the contract and the applicable building standards
• Keep records of all notifications and rectification work

What builders are not required to do during the DLP:

• Rectify damage caused by the homeowner or their tenants after handover
• Fix normal wear and tear
• Make improvements that were not in the original contract
• Rectify items the homeowner agreed to accept in writing at practical completion

The difference between DLP obligations and statutory warranty

The DLP is a contractual obligation. The statutory warranty is a legislative obligation that operates independently of the contract — and it cannot be reduced by the contract.

	DLP	Statutory warranty
Source	Contract	State legislation
Duration	Typically 13 weeks (minimum 12 months in QLD)	1–2 years (minor), 6–7 years (major/structural)
Can be contracted out	No (statutory minimums override)	No
What it covers	All notified defects	Non-structural or major/structural defects depending on period

After the DLP ends, homeowners can still make statutory warranty claims for defects that fall within the legislative warranty periods. A defect noticed in month 18 of a build is still claimable under the statutory warranty (typically covering major defects for six years) even if the DLP ended at month three.

Builders sometimes mistakenly believe that once the DLP expires, their obligations end. This is incorrect. The statutory warranty continues.

How to manage the DLP professionally

Set expectations at handover

Brief your customer at the practical completion handover:

• Explain what the DLP is and how long it runs
• Explain how to submit a defect notification (in writing, to a nominated email address)
• Provide your DLP contact — a specific name and email, not just a general inbox
• Explain what falls within your responsibility (contract defects) vs what does not (damage, wear and tear)

Homeowners who understand the process are far less likely to become frustrated and escalate.

Create a DLP tracking system

Every defect notification must be tracked:

• Date received
• Description of the defect
• Your assessment (legitimate defect / not a defect / homeowner-caused)
• Date of inspection
• Rectification committed and scheduled
• Date of rectification completion
• Homeowner confirmation of rectification

A spreadsheet or project management tool works. Some builders use Checka as a shared platform — the homeowner logs defects and the builder has visibility of the list. This reduces confusion about what has been reported versus what has been actioned.

Respond and rectify promptly

Delays in responding to DLP notifications are the most common cause of homeowner escalation to the QBCC, NSW Fair Trading, DBDRV, or tribunal. Even if you cannot fix an item immediately, acknowledging the notification and providing a timeline demonstrates good faith.

A response within five business days of receiving a written notification is reasonable in most circumstances. Where a defect requires trades or materials that are not immediately available, communicate this proactively.

Dispute the right ones, not all of them

Some builders reflexively dispute every defect notification to avoid cost. This strategy backfires. Disputing legitimate defects damages the customer relationship and can result in escalation that costs far more than the rectification would have.

The correct approach is to inspect promptly, assess objectively against the building standards, and dispute only items that genuinely fall outside your obligations — with a clear, written explanation of why.

Protecting yourself from false claims

The DLP also needs to protect builders from claims that are:

• For damage caused by the homeowner after occupation
• For items not included in the original contract
• For issues that arose from homeowner modifications
• Beyond the scope of what building standards require

Protect yourself by:

Thorough pre-handover documentation Photograph every surface, room, and fitting at practical completion. Dated photographs establish the condition at handover. If a homeowner claims a defect that was not present at handover, your photos show the original condition.

A signed practical completion certificate Ensure the homeowner signs the practical completion certificate after the PCI. If they have raised defects and agreed to accept practical completion with those defects noted, ensure the outstanding items are listed specifically on the certificate.

Written defect and omissions list At the PCI, ensure any agreed defects are recorded in writing. Defects the homeowner identified but you agreed to fix are documented. Items the homeowner raised but you assessed as outside scope are documented and responded to in writing.

When a DLP notification becomes a dispute

If a homeowner notifies a defect during the DLP and you disagree about whether it is a legitimate defect, the dispute process varies by state:

• Queensland: QBCC has a free dispute resolution service for registered builders
• NSW: NSW Fair Trading mediation
• Victoria: DBDRV (Domestic Building Dispute Resolution Victoria)
• South Australia, WA, TAS, ACT: Respective state authority mediation

Resolving disputes early through mediation is almost always preferable to tribunal. A tribunal outcome is binding but unpredictable, takes months, and involves legal costs that typically exceed the cost of rectification even when you prevail.

Key Takeaways

• The DLP under most HIA contracts is 13 weeks, but Queensland imposes a statutory minimum of 12 months — check the legislation that applies to your project
• After the DLP, statutory warranty obligations continue for 1–2 years (non-structural) and 6–7 years (structural/major) — the DLP ending does not end your obligations
• Set DLP expectations at handover, track every notification systematically, respond within five business days, and communicate timelines proactively
• Protect yourself from false claims with comprehensive dated photography at practical completion and a signed completion certificate listing any agreed outstanding items
• Dispute only legitimate non-obligations, clearly and in writing — reflexively disputing all claims damages relationships and typically escalates costs
• If you are uncertain about your obligations under a specific contract or the legislation that applies in your state, seek advice from a construction lawyer or your industry association (HIA or MBA) before responding to a claim. This article provides general guidance only and does not constitute legal advice.

Early resolution through mediation (QBCC, NSW Fair Trading, DBDRV) is almost always more cost-effective than tribunal