Post-Completion Defects Investigation
When building defects surface after handover, the project record stops telling the full story. The work is built. The trades have moved on. The contract administration has wrapped. What's left is a property with a problem and three open questions: what's the actual cause, who's responsible, and what does putting it right look like.
What a post-completion defects investigation covers
The investigation typically runs in three stages:
- Document review. Contract, design documents, ITPs (if any), variations, RFIs, defect notification, prior correspondence, warranty period status, and any insurer or tribunal documents. The aim is to understand what was supposed to be built before the site visit happens.
- Site inspection. A forensic inspection of the affected work. Photographs, measurements, samples (where destructive testing isn't required), notes on conditions, and inspection of adjacent or upstream work where the defect's cause might sit. Where destructive testing or specialist sub-discipline (geotechnical, hydraulic, structural engineering) is needed, QBFS coordinates the right consultant or accredited lab.
- Written report. A defects investigation report with each defect detailed, the cause evidenced and referenced to Australian Standards or NCC clauses, the responsible party identified where the evidence supports a view, and a rectification approach with rough scope.
Why owners, builders, and lawyers engage QBFS for this work
For owners, the investigation gives a clear picture before they spend money on rectification or open a dispute. Many post-completion defects look catastrophic and turn out to be cosmetic. Others look minor and turn out to indicate a structural issue. The investigation separates the two.
For builders, an early independent investigation often resolves the matter without a tribunal or court. Where a builder is genuinely not responsible (owner maintenance failure, third-party damage, unsuitable use), the report is the cleanest way to evidence that.
For lawyers, the investigation is the foundation of a defects matter. An evidence-grade report from QBFS shortens the brief to counsel and improves the prospects of resolution.
Common defects QBFS investigates
The most frequent investigation triggers:
- Waterproofing failures (balconies, bathrooms, planter boxes, basement)
- Structural movement (cracking, sagging, deflection)
- Render failure and external cladding defects
- Tile and stone defects (lippage, cracking, drummy areas)
- Roof and gutter defects (leaks, ponding, sheet metal failures)
- Non-conforming structural elements (incorrect tie-downs, missing fixings, undersized members)
- Fire and acoustic separation issues in multi-residential
- Site drainage and slab moisture issues
- Sub-floor ventilation problems
- Workmanship defects in finishes
When to commission the investigation
The earlier the better. Three reasons:
- Evidence is captured before site conditions change. Defects can worsen, be amplified by subsequent maintenance attempts, or be obscured by rectification work commissioned in haste.
- Statutory and warranty periods don't pause for indecision. Each state's home-building or domestic-building legislation has time limits for defect notification. An early investigation supports a timely notification.
- The other party can be brought in. Where the matter sits in dispute, an early independent inspection invites the responsible party's expert to attend the same site visit. Joint inspections often resolve matters that would otherwise escalate.
How the work runs across Australia
Most engagements are coordinated from Brisbane with travel built into the scope where the site sits elsewhere. The methodology is the same nationally; state-specific home-building or domestic-building legislation is captured in the report where it applies.
Tell Paul the project. The next step gets sorted on the call.
Common questions, answered.
- What counts as a post-completion defect?
A post-completion defect is a fault that becomes apparent after the build has been handed over. It might have been latent at handover (waterproofing failing slowly) or might have emerged later (cracking from settlement). The legal framework around defects sits in each state’s home-building or domestic-building legislation plus the contract; QBFS’s investigation focuses on the technical cause, with the report structured so the legal team can use it.
- How long does the investigation take?
Most single-property investigations report within two to four weeks from the briefing call. Complex multi-defect or multi-property investigations can run longer. The site visit usually happens within a week or two of engagement, and the report follows within two to three weeks after that.
- Will I need destructive testing?
Sometimes. If the cause can be established from non-destructive observation, no. If hidden elements need inspection (substrates, behind cladding, in slab construction), destructive testing is scoped during the site visit and quoted separately.
- Can QBFS organise rectification once the investigation is complete?
No. The investigation work is independent. QBFS doesn’t run rectification trades. The report includes a rectification approach with rough scope so an owner can put it out to tender or a builder can quote it.
- Does the investigation cover the legal side?
No. The investigation is technical. Legal interpretation of the home-building or domestic-building legislation is for the lawyer engaged on the matter. The QBFS report is written so the lawyer can use it directly.
- What does an investigation cost?
The fee depends on the number of defects, property complexity, and whether destructive testing or specialist sub-consultants are required. Call Paul on 0407 146 737 to walk through the property and the defects and a fee proposal follows.
