Quick Overview

• A building inspector examines accessible structural elements, roof void and subfloor areas, internal and external surfaces, and safety hazards.
• Moisture detection, often using thermal imaging or moisture meters, is a core part of a thorough visual inspection.
• A combined building and pest inspection also checks for visible signs of termite activity, timber decay, and wood borer damage.
• Findings are documented with photographs and delivered in a detailed report, typically within 24 hours.
• Some areas, such as fully enclosed wall cavities or inaccessible roof sections, fall outside what any visual inspection can cover, and a good inspector will tell you exactly where those limits sit.

Why Buyers Ask This Question

Most Sydney buyers have never sat through a building inspection before, so it makes sense to want clarity before booking one. Knowing what does a building inspector look for helps you understand the value of the report you are paying for, and it also helps you use the inspector’s time on the day more effectively, since you can point out specific areas of concern.

It also sets realistic expectations. A pre-purchase building and pest inspection is a thorough visual assessment of accessible areas, not an invasive investigation involving removing wall linings or lifting flooring. Understanding this distinction upfront means you are not disappointed by what the report does and does not cover.

The Main Areas a Building Inspector Examines

A pre-purchase building and pest inspection conducted in line with Australian Standard AS4349 generally covers the following areas.

Structural Elements

Structural condition sits at the core of any building inspection. This includes roof framing, walls, floors, and foundations, along with any visible signs of movement, cracking, or settlement. A licensed builder with hands-on construction experience can often identify whether a crack is cosmetic or indicates a more significant structural issue.

Roof Void and Subfloor Areas

Where safely accessible, an inspector examines the roof void and subfloor for signs of moisture, timber decay, pest activity, and general condition. These areas are frequently where the most useful evidence sits, since they are rarely seen or maintained by homeowners and can reveal issues not visible from inside the living areas.

Internal and External Surfaces

Walls, ceilings, floors, windows, and doors are all checked for visible defects, water staining, and general wear. Externally, this extends to cladding, render, brickwork, guttering, and drainage around the property.

Moisture Detection

Rising damp, leaks, and poor drainage are among the most common issues found during inspections. Many inspectors, including Barrenjoey Inspections, use thermal imaging and moisture meters to identify dampness that is not yet visible to the eye, giving buyers an earlier warning than a purely visual check alone.

Safety Hazards

Balustrades, stair handrails, smoke alarms, and electrical or trip hazards are all checked against general safety expectations. These findings matter not only for your own household but also for future resale, since safety defects are commonly flagged by buyers further down the line.

Timber Pest Activity

As part of a combined building and pest inspection, the inspector also checks for visible evidence of termite activity, timber decay, and wood borer damage. This is a separate but complementary assessment to the structural check, and the two together give buyers a genuinely useful picture of the property’s condition. If you want to understand what this part of the process looks for specifically, our guide on signs of termites in your home walks through the common indicators.

What a Building Inspector Checks

What a Building Inspection Does Not Cover

A thorough visual inspection has clear limits, and a reputable inspector will always explain them rather than let you assume otherwise. Areas that are not safely accessible, such as fully enclosed wall cavities, areas beneath fixed flooring, or roof sections without safe access, cannot be inspected without invasive work.

This is why the report reflects what was visible and accessible on the day, not an exhaustive guarantee of every condition within the property. If a specific concern exists, such as a known past leak or an area flagged by the vendor, it is worth mentioning this to your inspector before the appointment so they can pay closer attention to that area within the accessible scope.

“I didn’t realise how much detail would go into the roof void and subfloor until I saw the photos in the report. It genuinely felt like the inspector had checked everything he could physically reach,” said a Northern Beaches property buyer, describing a typical pre-purchase inspection experience.

How the Inspection Process Works

Understanding what does a building inspector look for is easier once you see the full process from booking through to the final report.

What Happens During a Pre-Purchase Building and Pest Inspection

1. Booking the inspection – you confirm the property address and preferred date, and access is arranged with the agent.
2. On-site visual assessment – a licensed builder examines structure, moisture, safety, and timber pest indicators across all accessible areas.
3. Photographic documentation – every finding is recorded with clear photographs to support the written report.
4. Detailed report delivered within 24 hours – you receive a plain English, AS4349 compliant report ready to share with your solicitor or buyers agent.
5. Follow-up phone consultation – a follow-up call is available to walk you through key findings and what they mean for your decision.

Why It Matters Who Is Doing the Looking

Not every inspector brings the same background to the property. Marc Hanley, founder of Barrenjoey Inspections, is a licensed builder with over 30 years of hands-on construction experience, which shapes how a property is assessed. Understanding how a building is actually put together, where builders typically cut corners, and how different construction eras behave over time all inform what an inspector notices and how they interpret it.

Every inspection at Barrenjoey Inspections is conducted independently, with findings reported factually and without influence from agents or any other third party. Before you exchange contracts, it is worth speaking to an experienced local inspector who understands Northern Beaches and North Shore construction specifically, rather than a generic checklist approach.

For buyers considering an apartment or strata property, the scope shifts slightly to focus on the unit and visible common property; our strata and apartment buyer inspections page explains what is covered in that context. If you are planning renovations or new construction nearby, a pre-construction and dilapidation inspection documents existing property condition before work begins.

Common Findings Buyers Are Often Surprised By

Some of the most useful findings in a building inspection report are not the ones buyers expect. Cosmetic issues like a chip in the paintwork or a marked benchtop are easy to spot without help, but the findings that genuinely change a buying decision usually sit somewhere less obvious.

Rising damp along skirting boards. This often shows up as discolouration or a musty smell rather than an obvious wet patch, and it can point to drainage or waterproofing issues that are expensive to resolve.

Minor roof movement that has gone unnoticed. Small amounts of sagging in older roof frames are common and not always urgent, but they are worth understanding before you buy, particularly if further renovation work is planned.

Evidence of a past repair that was not finished properly. Inspectors regularly find patched areas where previous work addressed the surface issue without resolving the underlying cause, which means the same problem can resurface later.

Subfloor ventilation that is inadequate for the property. Poor airflow beneath the home increases moisture retention, which in turn raises the risk of timber decay and creates more favourable conditions for termite activity.

None of these findings are necessarily deal breakers. What matters is that you know about them before you exchange contracts, not after, so you can factor them into your decision, your negotiation, or your maintenance planning for the property.

How to Get the Most Out of Your Inspection

A building inspection is more useful when you treat it as a two-way conversation rather than a box-ticking exercise. A few simple steps can help you get more out of the appointment.

Share any known history you have about the property, including past renovations, previous leaks, or anything mentioned by the agent or vendor. Ask your inspector to walk you through the report rather than only reading the summary, since context often matters as much as the individual findings. If a finding is unclear, ask directly what it means for the property’s condition and what, if anything, should happen next.

Buyers who engage with the process this way tend to walk away with a much clearer picture of what they are purchasing, rather than a report full of technical terms they only partially understand.