A pre-purchase building inspection is a visual survey of a dwelling, carried out for a buyer who needs to know the condition of the property before they are bound to complete. In Australia the usual reference is AS 4349.1, the standard for pre-purchase inspections of residential buildings. It is not a certificate of compliance, not a warranty, and not a promise that every defect has been found. It is a structured look at what a reasonably competent inspector can see, on the day, from the areas they can safely reach.
That distinction matters more than the brochure language suggests. Buyers often treat the report as a clean bill of health. Inspectors write it as a record of observations, limitations and risk. If you are buying through a pre-purchase inspection clause, the difference between those two readings can decide whether you proceed, renegotiate, or walk away.
What AS 4349.1 actually asks the inspector to look at
The standard divides the dwelling into areas. The inspector works through them in a repeatable order so that the same house, inspected by two competent people, should produce reports that at least cover the same ground. The usual sweep is site, exterior, interior, roof exterior, roof space, subfloor, and services at a visual level.
Site
The inspector walks the allotment looking at surface drainage, retaining walls that affect the dwelling, paths, driveways, steps, and obvious site hazards. They note whether the ground falls towards the house, whether garden beds have been built up against brickwork, and whether a concrete path has been poured over weepholes. On a 1960s brick veneer in western Sydney they may write that the rear yard falls towards the laundry and that a spoon drain has silted up. On a Queenslander on stumps in inner Brisbane they may note that the ground under the house is damp and that vegetation has closed the subfloor vents.
Site comments are often the ones buyers skip. They are also the ones that explain a damp smell six months after settlement. Poor fall, blocked stormwater and built-up soil against walls are not glamorous defects. They are the conditions that feed rising damp, salt attack and termite activity.
Structure and exterior
From the ground the inspector looks at walls, windows, doors, eaves, fascias, gutters, downpipes, decks, verandahs and attached structures. They are looking for cracking, movement, decay, missing flashings, rusted lintels, failed pointing, and attachments that were never designed as part of the house — a carport bolted to a gutter, a first-floor deck with no visible tie-down, a lean-to roof that discharges onto a wall.
What they write depends on the stock. A Federation house in Haberfield may show stepped cracking at a bay window and rusted steel lintels over openings. A 1980s brick veneer in the Melbourne growth corridors may show hairline cracking at cornices and a slab edge that has been backfilled. A cyclone-rated house in Darwin or Townsville may look tidy at eye level and still have tie-down connections that cannot be confirmed without opening linings.
The inspector is not proving the structure. They are recording what the visible fabric suggests. Horizontal cracking at damp-course height, a bow in a brick pier, or a ridge line that sags between supports will be written as observations, usually with a recommendation for a structural engineer if the pattern looks more than cosmetic.
Interior
Inside, the inspector works room by room: floors, walls, ceilings, joinery, wet areas, stairs, and obvious safety items such as balustrades and smoke alarms where they can be seen. They are not testing every tap for an hour. They are looking for movement, moisture, incomplete work, and the sort of defect a buyer will live with or pay to fix.
Typical interior comments sound like this. “Floor to the rear of the kitchen has a noticeable bounce. Joist or bearer condition not confirmed. Further investigation of the subfloor recommended.” Or: “Silicone to the shower hob is failed. Adjacent plaster is soft. Moisture readings elevated. Licensed plumber and tiler to advise.” Or, in an occupied house: “Built-in robes and stored goods limited inspection of walls in bedroom 2.”
Buyers who want a forensic moisture survey of every wet area need to say so when they brief the inspector. A standard walk-through will pick up obvious leaks. It will not dismantle a shower screen.
Roof exterior and roof space
From the ground, a ladder, or a roof walk where it is safe, the inspector looks at coverings, flashings, valleys, penetrations, cappings and the way water is meant to leave the building. In the roof space they look at framing, bracing, insulation, sarking, party walls in terraces, and the underside of the covering.
Access is the usual problem. Many Australian roofs are too steep, too brittle, or too low to walk. Terracotta tiles in a Victorian terrace may be walked only with boards. A COLORBOND roof in afternoon heat may be refused on safety grounds. In the roof space, insulation that has been piled to the rafters, or a hatch that opens into a 600 millimetre cavity, will produce the sentence buyers hate: “Roof space inspection limited. Full inspection not possible.”
That sentence is not padding. It means the inspector did not see the ridge, the valley, or the framing over the ensuite, which is often where leaks start.
Subfloor
Where the house is on stumps, piers or a raised floor, the subfloor is one of the most useful parts of the inspection. The inspector looks at stumps, ant caps, bearers, joists, piers, damp, ventilation, debris, and the condition of the floor from below. They will note termite evidence if they see it, but a building inspection is not a timber pest inspection. The overlap is explained in our piece on timber pest reports versus building reports.
A typical subfloor paragraph from an inspector in Adelaide or Launceston might read: “Redgum stumps with some surface checking. Ant caps present but not continuous at the laundry. Ground moisture high at the south wall. Ventilation restricted by stored timber. Recommend clearing, improving drainage, and a timber pest inspection.”
On a slab-on-ground house there is no subfloor to enter. The inspector then looks at slab edges, control joints, and the way the ground meets the wall. That is a different risk profile, not a cleaner one.
Services at visual level
Plumbing, electrical, gas and stormwater are inspected as visible installations, not as tested systems. The inspector may run taps, flush a toilet, and look at the meter board, hot-water unit, and the stormwater discharge point. They do not perform a pressure test, an electrical safety certificate, or a CCTV drain survey unless that has been separately commissioned.
What they write is therefore cautious. “Hot-water unit appears aged. No evidence of current leak. Condition of sacrificial anode and internal tank not determined.” “Downpipe at the south-east corner discharges to the ground adjacent to the footing.” “Smoke alarms present. Operation and interconnection not tested.”
If you need those systems proven, you book a plumber, an electrician, or a drain camera. The building report is there to tell you that the booking is worth making.
Access, occupied houses, weather and locked rooms
AS 4349.1 assumes reasonable access. It does not assume that every cavity will be opened. An inspector will not cut a hole in a plaster ceiling, lift a fitted carpet, or move a locked fridge unless the agreement says so and the vendor allows it.
Occupied houses are the normal case in Australian sales. That means furniture against walls, clothes in robes, cars in garages, and dogs that make a subfloor less attractive. A competent inspector records the limitation instead of pretending it was not there. “Inspection of the garage was limited by stored goods and a locked freezer” is a real sentence. It means you do not know what is behind the freezer.
Weather matters. Rain can hide an active roof leak by making everything wet, or it can reveal one. A dry week in Perth may leave a valley looking sound that weeps in the first winter front. Extreme heat can make a metal roof unsafe. High wind can make a ladder inspection of a two-storey eave a refusal. The report should say what the weather was doing, because the next reader — you, your conveyancer, a later buyer — needs to know the conditions.
Locked rooms and locked manholes are not a minor inconvenience. A locked granny flat, a bolted roof hatch, or a subfloor door wired shut is an area that was not inspected. If the contract timeline is tight, get the agent to open it and send the inspector back. A report that lists “area not inspected” is weaker than a report that lists defects you can price.
What sits outside a standard inspection
A standard pre-purchase inspection does not do several things buyers assume it does.
It does not confirm that the building complies with the National Construction Code, planning permits, or occupancy certificates. Unapproved work may be obvious — a recently enclosed verandah, a loft conversion with no visible fire separation — and the inspector may say so. They are not a certifier.
It does not identify asbestos, lead paint or contamination as a laboratory finding. An inspector may note that a 1970s eaves lining is consistent with asbestos-cement sheet and recommend testing. That is not a hazardous-materials survey.
It does not inspect strata common property as a building-wide audit. In an apartment the inspector looks at the lot and at the common property only to the extent it affects that lot and is reasonably accessible. The building’s cladding, basement waterproofing and balcony membrane usually sit in a different report.
It does not replace a timber pest inspection, a swimming-pool compliance certificate, or a bushfire-attack-level assessment.
It does not give you a cost to repair. Some reports include a commentary range. That is still not a quote. How to read a building inspection report is the companion piece on using those comments without treating them as a price list.
Special-purpose inspections are a different job
AS 4349.1 is a general pre-purchase inspection. A special-purpose inspection is something else: a defect inspection of a new house at handover, a leak investigation, a dilapidation survey before neighbouring works, or a focused look at one system. The scope is written in the agreement. The inspector may open more, test more, or confine themselves to a single complaint.
If you already know the roof leaks, do not book a standard pre-purchase and hope the leak is found. Book a special-purpose inspection of the roof and the wet area, and tell the inspector what has already failed. The standard inspection is designed for a buyer who does not yet know the house. It is a poor tool for a known problem.
How the inspection sits against a contract timeline
The inspection is only useful if it arrives while you can still act. That is a contract problem, not a building one, and it varies by state. This is not legal advice. Use a conveyancer or solicitor.
In New South Wales the standard residential contract has a five-business-day cooling-off period after exchange, unless it is waived. Many buyers also insert a building-and-pest special condition with a longer window, often seven to fourteen days, because a cooling-off period is a blunt instrument and an inspection condition can be written to allow termination or a negotiated credit. The inspection needs to be booked the day you go unconditional on the inspection clause, not the day before it expires.
In Victoria, cooling-off is typically three business days, and the section 32 vendor statement is a disclosure document, not an inspection. A section 32 that is silent on defects does not mean the house is sound. Buyers who treat the section 32 as a substitute for an inspector are reading the wrong document. Inspection special conditions are still the usual way to keep a right of termination after you have had someone on site.
In Queensland, REIQ-style contracts commonly carry building-and-pest special conditions with a defined number of days. The language is often “satisfactory to the buyer”, which is broader than “free of major defects” and is also easier to argue about. Book early. A wet-season inspection in Cairns or a house with a locked subfloor will eat days.
Western Australia’s offer-and-acceptance process does not give buyers a nationally familiar cooling-off right. Inspection conditions have to be written into the offer. If they are not there, you may be inspecting a house you are already bound to buy.
South Australia’s cooling-off is short — two clear business days is the usual figure buyers hear — and the Form 1 is again disclosure, not condition. Inspection conditions are negotiated. Tasmania and the ACT have short cooling-off windows and a culture of special conditions. The Northern Territory is less standardised; the inspection right is whatever the contract says.
The practical rule is the same everywhere. Read the clause. Count the days. Book the inspector before you start arguing with the agent about access. Inspection clauses, cooling-off and special conditions walks through the language in more detail. Choosing a building inspector is the piece to read before you book.
What inspectors actually write when the house is ordinary
Most Australian houses are not falling down. They are tired in predictable ways. A competent report on a 1970s brick veneer in the suburbs will not shout. It will list a rusted valley, a water heater past its marked life, a fence that is the neighbour’s problem as much as yours, and a subfloor with poor ventilation. The summary may say the house is in fair condition for its age.
That phrase is doing a lot of work. It means the inspector saw defects they consider consistent with a fifty-year-old house, and did not see a defect they would call major in the sense of the standard. It does not mean you should not price the valley, the water heater and the drainage. It does not mean the next summer’s termite flight will leave the house alone.
If the inspector writes “further investigation recommended” against the shower, the roof space or the slab edge, they are telling you the visual inspection ran out. That is not indecision. It is the limit of the method. Pay for the next look before you treat the report as finished.
A standard inspection is a record of what could be seen, on the day, from the areas that could be reached. Everything else is a limitation, not a clearance.
A short checklist before you book
- Confirm the agreement cites AS 4349.1 and states whether pest is included.
- Tell the inspector the construction type if you know it: cavity brick, veneer, weatherboard, Queenslander, slab-on-ground.
- Ask the agent, in writing, for roof-hatch, subfloor and granny-flat keys on the day.
- Do not book the last afternoon of the clause. Leave time for a plumber or engineer if the report asks for one.
- Read the limitations page before the summary. If half the house was inaccessible, the summary is a summary of half the house.
- Decide in advance whether you will terminate, renegotiate, or proceed, so the report has a job to do.
The inspection will not make the house better. It will tell you, within a defined method, what kind of house you are buying. That is the whole of its value, and it is enough if you use it in time.
