How to Read a Building Inspection Report (Australia)
Your inspector just emailed you a 47-page PDF titled Pre-Purchase Building Inspection Report, and settlement is in twelve days. This is the version of "how to read it" that doesn't require you to first become an inspector.
The structure of an AS 4349.1 report
Every Australian residential building inspection written to AS 4349.1 follows the same skeleton. Learn the skeleton and the 47 pages stop feeling like a wall of text:
- Property identification & scope - address, date, weather on the day, inspector credentials, and the critical limitations clause (where the inspector couldn’t access).
- Executive summary - usually two pages. This is the buyer’s report; everything else is evidence.
- Structural elements - footings, walls, roof structure. The expensive section.
- Building envelope - roof covering, gutters, windows, external cladding. The weather-proofing section.
- Interior - floors, walls, ceilings, joinery, wet areas.
- Services - electrical, plumbing, gas (visual only; a licensed trade must inspect for compliance).
- Subfloor and roof space - where most termite and moisture findings live.
- Safety - smoke alarms, RCDs, pool fence if applicable.
The severity words that matter
Inspectors use deliberately graded language. These five phrases are the ones your offer hinges on:
- "Major defect" - structural, safety, or substantial cost. This is a negotiate-or-walk signal.
- "Significant item" - warrants further investigation, repair, or follow-up. Vaguer than "major" but still material.
- "Minor defect" - wear, maintenance, cosmetic. These accumulate but rarely change the offer.
- "Safety hazard" - immediate risk to occupants. RCD absence, loose balustrades, asbestos handling.
- "Further investigation required" - the inspector isn’t confident. Get the secondary inspection before exchange, not after.
The findings you can safely skim
Inspectors are trained to flag everything visible. That means a lot of lines that feel alarming but aren’t actionable. Common low-signal findings include: minor paint flaking, slight gutter fall, isolated hairline cracks in render under 0.3 mm, aged caulking in wet areas, slightly worn floor coverings, minor rust on external flashings. You will rarely negotiate a price reduction for any of these.
The findings that change the offer
These are the ones worth a line-by-line re-read:
- Any structural crack wider than 0.3 mm, especially if vertical or diagonal through brickwork or render
- Any moisture reading above 85% at the base of walls, with or without visible tide marks
- Any mention of active termite activity or evidence of past infestation without a documented treatment history
- Absence of RCD safety switches on a post-1991 installation (non-compliant with AS/NZS 3000)
- Subfloor ventilation reduced or obstructed, especially combined with moisture findings
- Any safety hazard classified "major" - these are the items insurers and lenders pay attention to
How to negotiate from the report
Buyers who successfully use a building inspection report in negotiation do three things. First, they translate inspector language into dollars - a "significant" crack becomes "$6,000 to $18,000 of underpinning and re-rendering." Second, they separate safety hazards from aesthetic items and anchor the conversation on safety. Third, they ask for a specific credit at settlement, not a general discount, backed by quotes if possible. A good building inspection report gives you the ammunition for all three.
When to commission a second opinion
If the report flags structural movement, you want a qualified structural engineer. If it flags termites, you want a licensed pest manager with treatment authority. If it flags roof issues on a tiled roof, a roofer. These secondary inspections cost $300–$800 each and nearly always pay back many times over by either confirming the severity or quietly ruling it out.