A standard building inspection in New Zealand is a visual, non-invasive assessment of a property's condition — but it does have real limits. Inspectors can only report on what they can safely see and access on the day, which means certain areas and systems are routinely excluded from the standard scope. Knowing these exclusions upfront helps you make informed decisions and arrange any additional specialist checks you may need.
What a Standard Inspection Actually Covers
A qualified building inspector will typically walk through the property and assess accessible, visible elements: the roof exterior (if safely accessible), exterior cladding, foundations, interior rooms, ceilings, floors, windows, doors, and subfloor spaces where entry is possible. The report gives you a snapshot of the home's condition based on what can be observed without causing damage.
For guidance on what a thorough inspection should include, BRANZ publishes research and best-practice guidance for the NZ building industry that is worth familiarising yourself with.
Common Areas Excluded from a Standard Inspection
Hidden and Concealed Spaces
Wall cavities are one of the most significant exclusions. Inspectors cannot open walls, so moisture damage, rotting framing, or insulation defects hidden inside wall cavities may go undetected. This is particularly relevant in older NZ homes with monolithic cladding systems (such as EIFS or fibre cement over a cavity-less frame), which have historically been associated with weathertightness issues.
Roof spaces (attics) may be excluded if the access hatch is too small, blocked, or if entry would be unsafe. Similarly, subfloor areas are excluded if there is insufficient clearance or if access is blocked.
Inaccessible Roof Areas
If a roof is too steep, too high, or otherwise unsafe to walk on, the inspector will typically assess it from ground level using binoculars or a camera pole. This means fine detail — cracked tiles, failing flashings, or early membrane deterioration — may not be visible. Always ask your inspector how they assessed the roof.
Electrical Systems
Building inspectors are not licensed electricians. A standard inspection may note obvious visible concerns (exposed wiring, damaged switchboards), but it does not include testing circuits, checking earthing, or assessing compliance with the current wiring rules. Electrical work in NZ is restricted work under the Electrical Workers Registration Board (EWRB), and a full electrical inspection requires a registered electrician.
Plumbing and Drainage
Similarly, inspectors may observe visible plumbing — taps, visible pipes, hot water cylinders — but drain condition, pipe integrity, and underground drainage are excluded. A CCTV drain inspection by a licensed drainlayer is a separate service. Plumbing and drainlaying are restricted trades regulated by the Plumbers, Gasfitters and Drainlayers Board (PGDB).
Gas Appliances and Reticulation
Gas systems — including flues, connections, and appliances — are outside the scope of a standard building inspection. Gasfitting is restricted work under the PGDB, and you should arrange a separate gas inspection if the property has gas.
Specialist Systems and Equipment
The following are almost always excluded:
- Alarm and security systems
- Heat pumps and air conditioning units (beyond a basic visual check)
- Solar panels and inverters
- Swimming pools and spas (these may also require separate compliance checks under local council rules)
- Lifts or mechanical ventilation systems
- Underfloor heating
Asbestos, Hazardous Materials, and Contamination
Building inspectors are not licensed asbestos assessors. While an experienced inspector may flag materials that could contain asbestos (common in NZ homes built before the mid-1980s), confirmation requires sampling and laboratory testing by a specialist. WorkSafe NZ sets the rules around asbestos identification and removal. Methamphetamine contamination testing is also a separate specialist service.
Consented vs. Unconsented Work
An inspector can note work that appears unconsented or non-compliant, but they cannot access council records. Checking the LIM report (Land Information Memorandum) through your local council is essential for confirming what work has been consented and signed off. MBIE Building Performance has clear guidance on building consents and what work requires one.
Pest and Timber Borer Inspections
While an inspector may note visible borer damage or conditions conducive to pests, a full timber pest inspection (borer, termites, fungal decay) is typically a separate service carried out by a specialist.
A Quick Reference: In vs. Out
| Typically Included | Typically Excluded |
|---|---|
| Visible roof exterior | Concealed roof structure (if inaccessible) |
| Exterior cladding | Inside wall cavities |
| Accessible subfloor | Blocked or unsafe subfloor |
| Visible plumbing | Underground drainage |
| General electrical observations | Circuit testing, earthing checks |
| Interior rooms and fittings | Alarm/security systems |
| Visible moisture signs | Asbestos/meth testing |
When to Call a Professional
If your building inspection report flags concerns — or if you want peace of mind on excluded areas — arrange specialist inspections before going unconditional on a purchase. A registered electrician (EWRB), licensed plumber or drainlayer (PGDB), asbestos assessor, or weathertightness specialist can investigate further. For complex structural concerns, a Licensed Building Practitioner (LBP) or structural engineer may be needed — check LBP.govt.nz for the register.
You can find qualified local building inspectors and related tradespeople on tradedirectory.co.nz to help you get the full picture before you buy.
Licensed Building Practitioner (LBP)
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